List of counties in Colorado

All you want to know about List of counties in Colorado

Colorado counties
Main article: Geography of Colorado
See also: State of Colorado and History of Colorado

This is a list of the 64 counties of the U.S. State of Colorado. The counties of Colorado are important components of government since the state has no secondary civil subdivisions such as townships. Two counties, the City and County of Denver and the City and County of Broomfield, have consolidated city and county governments.

Contents

Table of Colorado counties

County
 FIPS Code
[1][2]		 County seat
[3][4]		 Established
[5]		 Formed from
[5]		 Etymolgy
[5]		 Population
[6]		 Area
[4]		 Map
Adams County 001 Brighton 1902-11-15 Split from Arapahoe County. Named in honor of Alva Adams, the 5th, 10th, and 14th Governor of the State of Colorado. &0000000000422495.000000422,495 &0000000000001182.2900001,182.29 sq mi
(&0000000000003062.0000003,062 km²)		 State map highlighting Adams County
Alamosa County 003 Alamosa 1913-03-08 Split from Costilla County and Conejos County counties. Named for the cottonwood trees which grow along the Rio Grande and its tributaries. Alamosa is a Spanish word for a cottonwood grove. &0000000000015313.00000015,313 &0000000000000723.210000723.21 sq mi
(&0000000000001873.0000001,873 km²)		 State map highlighting Alamosa County
Arapahoe County 005 Littleton 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Renamed South Arapahoe County for five months from 1902-11-15, to 1903-04-11. Named for predecessor Arapahoe County, Kansas Territory, which in turn was named for the Arapaho Nation of Native Americans. &0000000000545089.000000545,089 &0000000000000804.410000804.41 sq mi
(&0000000000002083.0000002,083 km²)		 State map highlighting Arapahoe County
Archuleta County 007 Pagosa Springs 1885-04-14 Split from Conejos County. Named in honor of Colorado State Senator Antonio D. Archuleta. &0000000000012572.00000012,572 &0000000000001354.5300001,354.53 sq mi
(&0000000000003508.0000003,508 km²)		 State map highlighting Archuleta County
Baca County 009 Springfield 1889-04-16 Split from Las Animas County. Named in honor of pioneer and Colorado territorial legislator Felipe Baca. &0000000000003871.0000003,871 &0000000000002558.4800002,558.48 sq mi
(&0000000000006626.0000006,626 km²)		 State map highlighting Baca County
Bent County 011 Las Animas 1870-02-11 Split from Huerfano County and former Cheyenne and Arapaho tribal land. Named in honor of frontier trader William Bent. &0000000000005844.0000005,844 &0000000000001541.0700001,541.07 sq mi
(&0000000000003991.0000003,991 km²)		 State map highlighting Bent County
Boulder County 013 Boulder 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for the abundance of granite boulders along Boulder Creek. &0000000000290262.000000290,262 &0000000000000740.480000740.48 sq mi
(&0000000000001918.0000001,918 km²)		 State map highlighting Boulder County
Broomfield County 014 Broomfield 2001-11-15 Split from Boulder, Adams, Jefferson, and Weld counties and reorganized as a consolidated city and county. Named for the broom corn that was formerly grown in the area. &0000000000053691.00000053,691 &0000000000000033.57000033.57 sq mi
(&0000000000000087.00000087 km²)		 State map highlighting Broomfield County
Chaffee County 015 Salida 1879-02-10 Split from Carbonate County. Named in honor of Jerome Bunty Chaffee, one of Colorado's first two U.S. Senators from 1876 to 1879. &0000000000016781.00000016,781 &0000000000001014.1200001,014.12 sq mi
(&0000000000002627.0000002,627 km²)		 State map highlighting Chaffee County
Cheyenne County 017 Cheyenne Wells 1889-03-25 Split from Elbert and Bent counties. Named for Cheyenne Nation of Native Americans. &0000000000001763.0000001,763 &0000000000001781.9000001,781.90 sq mi
(&0000000000004615.0000004,615 km²)		 State map highlighting Cheyenne County
Clear Creek County 019 Georgetown 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for Clear Creek which runs through the county. &0000000000008956.0000008,956 &0000000000000396.530000396.53 sq mi
(&0000000000001027.0000001,027 km²)		 State map highlighting Clear Creek County
Conejos County 021 Conejos 1861-11-01 Guadalupe County, one of the 17 original counties of the Territory of Colorado, was renamed Conejos County after six days on 1861-11-07. Named for the cottontail rabbits in the area. Conejos is a Spanish word for rabbits. &0000000000008074.0000008,074 &0000000000001290.2200001,290.22 sq mi
(&0000000000003342.0000003,342 km²)		 State map highlighting Conejos County
Costilla County 023 San Luis 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for the Costilla River. Costilla is a Spanish word meaning either little rib or furring timber. &0000000000003309.0000003,309 &0000000000001229.3800001,229.38 sq mi
(&0000000000003184.0000003,184 km²)		 State map highlighting Costilla County
Crowley County 025 Ordway 1911-05-29 Split from Otero County. Named in honor of Colorado State Senator John H. Crowley. &0000000000006643.0000006,643 &0000000000000800.270000800.27 sq mi
(&0000000000002073.0000002,073 km²)		 State map highlighting Crowley County
Custer County 027 Westcliffe 1877-03-09 Split from Fremont County. Named in honor of George Armstrong Custer, the U.S. Army colonel defeated and killed at the Battle of Little Bighorn. &0000000000004025.0000004,025 &0000000000000739.240000739.24 sq mi
(&0000000000001915.0000001,915 km²)		 State map highlighting Custer County
Delta County 029 Delta 1883-02-11 Split from Gunnison County. Named for the town of Delta located at the delta of the Uncompahgre River. &0000000000030334.00000030,334 &0000000000001149.4400001,149.44 sq mi
(&0000000000002977.0000002,977 km²)		 State map highlighting Delta County
Denver County 031 Denver 1902-11-15 The original Arapahoe County Seat was split from Arapahoe County and reorganized as a consolidated city and county. Named in honor of James W. Denver, Governor of the Territory of Kansas from 1857 to 1859. &0000000000588349.000000588,349 &0000000000000155.660000155.66 sq mi
(&0000000000000403.000000403 km²)		 State map highlighting Denver County
Dolores County 033 Dove Creek 1881-03-04 Split from Ouray County. Named for the Dolores River, which was originally named el Rio de Nuestra Senora de los Dolores, which is Spanish for the River of our Lady of Sorrows. &0000000000001914.0000001,914 &0000000000001076.9300001,076.93 sq mi
(&0000000000002789.0000002,789 km²)		 State map highlighting Dolores County
Douglas County 035 Castle Rock 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of Stephen Arnold Douglas, U.S. Senator from Illinois from 1847 to 1861. &0000000000272117.000000272,117 &0000000000000842.300000842.30 sq mi
(&0000000000002182.0000002,182 km²)		 State map highlighting Douglas County
Eagle County 037 Eagle 1883-02-11 Split from Summit County. Named for the Eagle River, which in turn was named for the abundance of eagles in the area. &0000000000051359.00000051,359 &0000000000001700.7600001,700.76 sq mi
(&0000000000004405.0000004,405 km²)		 State map highlighting Eagle County
Elbert County 039 Kiowa 1874-02-02 Split from Douglas County. Named in honor of Samuel Hitt Elbert, the sixth Governor of the Territory of Colorado. &0000000000022720.00000022,720 &0000000000001849.0800001,849.08 sq mi
(&0000000000004789.0000004,789 km²)		 State map highlighting Elbert County
El Paso County 041 Colorado Springs 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for Ute Pass. El paso is a Spanish exression for the pass. &0000000000587272.000000587,272 &0000000000002128.6000002,128.60 sq mi
(&0000000000005513.0000005,513 km²)		 State map highlighting El Paso County
Fremont County 043 Cañon City 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of John Charles Frémont, the explorer, U.S. Army general, and U.S. Senator from California. &0000000000047389.00000047,389 &0000000000001533.0900001,533.09 sq mi
(&0000000000003971.0000003,971 km²)		 State map highlighting Fremont County
Garfield County 045 Glenwood Springs 1883-02-10 Split from Summit County. Named in honor of James Abram Garfield, the twentieth President of the United States. &0000000000053631.00000053,631 &0000000000002958.2300002,958.23 sq mi
(&0000000000007662.0000007,662 km²)		 State map highlighting Garfield County
Gilpin County 047 Central City 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of William Gilpin, the first Governor of the Territory of Colorado. &0000000000005091.0000005,091 &0000000000000150.150000150.15 sq mi
(&0000000000000389.000000389 km²)		 State map highlighting Gilpin County
Grand County 049 Hot Sulphur Springs 1874-02-02 Split from Summit County. Named for the Grand River which was renamed the Colorado River in 1921. &0000000000013612.00000013,612 &0000000000001868.5300001,868.53 sq mi
(&0000000000004839.0000004,839 km²)		 State map highlighting Grand County
Gunnison County 051 Gunnison 1877-03-09 Split from Lake County. Named in honor of John Williams Gunnison, the U.S. Army captain who explored the region. &0000000000014973.00000014,973 &0000000000003259.2200003,259.22 sq mi
(&0000000000008441.0000008,441 km²)		 State map highlighting Gunnison County
Hinsdale County 053 Lake City 1874-02-10 Split from Lake, Conejos, and Costilla counties. Named in honor of George Aaron Hinsdale, a Lieutenant Governor of the Territory of Colorado. &0000000000000838.000000838 &0000000000001123.3500001,123.35 sq mi
(&0000000000002909.0000002,909 km²)		 State map highlighting Hinsdale County
Huerfano County 055 Walsenburg 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for Huerfano Butte, a solitary volcanic plug. Huerfano is a Spanish word meaning orphan. &0000000000007837.0000007,837 &0000000000001592.3700001,592.37 sq mi
(&0000000000004124.0000004,124 km²)		 State map highlighting Huerfano County
Jackson County 057 Walden 1909-05-05 Split from Larimer County. Named in honor of Andrew Jackson, the seventh President of the United States. &0000000000001381.0000001,381 &0000000000001619.7500001,619.75 sq mi
(&0000000000004195.0000004,195 km²)		 State map highlighting Jackson County
Jefferson County 059 Golden 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for its extralegal predecessor county, Jefferson County, Jefferson Territory, which in turn was named in honor of Thomas Jefferson, the author of the Declaration of Independence and the third President of the United States. &0000000000529354.000000529,354 &0000000000000772.850000772.85 sq mi
(&0000000000002002.0000002,002 km²)		 State map highlighting Jefferson County
Kiowa County 061 Eads 1889-04-11 Split from Bent County. Named for the Kiowa Nation of Native Americans. &0000000000001332.0000001,332 &0000000000001785.9000001,785.90 sq mi
(&0000000000004625.0000004,625 km²)		 State map highlighting Kiowa County
Kit Carson County 063 Burlington 1889-04-11 Split from Elbert County. Named in honor of Christopher Houston "Kit" Carson, the famous frontier scout and soldier. &0000000000007928.0000007,928 &0000000000002162.4300002,162.43 sq mi
(&0000000000005601.0000005,601 km²)		 State map highlighting Kit Carson County
Lake County 065 Leadville 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Renamed Carbonate County for two days from 1879-02-08, to 1879-02-10. Named for the Twin Lakes. &0000000000007913.0000007,913 &0000000000000383.550000383.55 sq mi
(&0000000000000993.000000993 km²)		 State map highlighting Lake County
La Plata County 067 Durango 1874-02-10 Split from Lake and Conejos counties. Named for the many silver deposits in the area. La plata is a Spanish expression for the silver. &0000000000049555.00000049,555 &0000000000001700.4400001,700.44 sq mi
(&0000000000004404.0000004,404 km²)		 State map highlighting La Plata County
Larimer County 069 Fort Collins 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of William Larimer, a pioneer entrepreneur. &0000000000287574.000000287,574 &0000000000002631.7500002,631.75 sq mi
(&0000000000006816.0000006,816 km²)		 State map highlighting Larimer County
Las Animas County 071 Trinidad 1866-02-09 Split from Huerfano County. Named for the Animas River, which was originally named el Rio de las Animas Perdidas, which is Spanish for the River of the Souls in Purgatory. &0000000000016010.00000016,010 &0000000000004773.2700004,773.27 sq mi
(&0000000000012363.00000012,363 km²)		 State map highlighting Las Animas County
Lincoln County 073 Hugo 1889-04-11 Split from Elbert and Bent counties. Named in honor of Abraham Lincoln, the sixteenth President of the United States. &0000000000005326.0000005,326 &0000000000002585.2100002,585.21 sq mi
(&0000000000006696.0000006,696 km²)		 State map highlighting Lincoln County
Logan County 075 Sterling 1887-02-25 Split from Weld County. Named in honor of John Alexander Logan, a U.S. Army general and U.S. Senator from Illinois. &0000000000021055.00000021,055 &0000000000001845.3100001,845.31 sq mi
(&0000000000004779.0000004,779 km²)		 State map highlighting Logan County
Mesa County 077 Grand Junction 1883-02-14 Split from Gunnison County. Named for the mesa formations which are widespread through the area. &0000000000139082.000000139,082 &0000000000003345.6900003,345.69 sq mi
(&0000000000008665.0000008,665 km²)		 State map highlighting Mesa County
Mineral County 079 Creede 1893-03-27 Split from Hinsdale, Rio Grande, and Saguache counties. Named from the plentiful mineral deposits found in the area. &0000000000000962.000000962 &0000000000000878.160000878.16 sq mi
(&0000000000002274.0000002,274 km²)		 State map highlighting Mineral County
Moffat County 081 Craig 1911-02-27 Split from Routt County. Named in honor of railroad pioneer David H. Moffat. &0000000000013648.00000013,648 &0000000000004755.8600004,755.86 sq mi
(&0000000000012318.00000012,318 km²)		 State map highlighting Moffat County
Montezuma County 083 Cortez 1889-04-16 Split from La Plata County. Named in honor of Aztec leader Moctezuma II. Ruins in the area were originally thought to have been of Aztec origin. &0000000000025221.00000025,221 &0000000000002035.8000002,035.80 sq mi
(&0000000000005273.0000005,273 km²)		 State map highlighting Montezuma County
Montrose County 085 Montrose 1883-02-11 Split from Gunnison County. Named for the town of Montrose, which in turn was probably named from the novel A Legend of Montrose, published in 1819 by Walter Scott. &0000000000039527.00000039,527 &0000000000002246.4300002,246.43 sq mi
(&0000000000005818.0000005,818 km²)		 State map highlighting Montrose County
Morgan County 087 Fort Morgan 1889-02-19 Split from Weld County. Named for old Fort Morgan, which in turn was named in honor of U.S. Army Colonel Christopher A. Morgan. &0000000000027961.00000027,961 &0000000000001293.8300001,293.83 sq mi
(&0000000000003351.0000003,351 km²)		 State map highlighting Morgan County
Otero County 089 La Junta 1889-03-25 Split from Bent County. Named in honor of Miguel A. Otero of the prominent Otero family of the Southwest. &0000000000018854.00000018,854 &0000000000001267.6600001,267.66 sq mi
(&0000000000003283.0000003,283 km²)		 State map highlighting Otero County
Ouray County 091 Ouray 1877-01-18 Split from Hinsdale and Lake counties. Renamed Uncompaghre County for four days from 1883-02-27, to 1883-03-02. Named in honor of Ouray, a Ute Native American leader. &0000000000004378.0000004,378 &0000000000000542.300000542.30 sq mi
(&0000000000001405.0000001,405 km²)		 State map highlighting Ouray County
Park County 093 Fairplay 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for South Park which occupies most of the county. &0000000000017004.00000017,004 &0000000000002209.3600002,209.36 sq mi
(&0000000000005722.0000005,722 km²)		 State map highlighting Park County
Phillips County 095 Holyoke 1889-03-27 Split from Logan County. Named in honor of R.O. Phillips, secretary of the Lincoln Land Company. &0000000000004499.0000004,499 &0000000000000688.300000688.30 sq mi
(&0000000000001783.0000001,783 km²)		 State map highlighting Phillips County
Pitkin County 097 Aspen 1881-02-23 Split from Gunnison County. Named in honor of Frederick Walker Pitkin, the second Governor of the State of Colorado. &0000000000015106.00000015,106 &0000000000000970.370000970.37 sq mi
(&0000000000002513.0000002,513 km²)		 State map highlighting Pitkin County
Prowers County 099 Lamar 1889-04-11 Split from Bent County. Named in honor of John W. Prowers, a pioneer of the Arkansas River valley. &0000000000013181.00000013,181 &0000000000001645.3700001,645.37 sq mi
(&0000000000004261.0000004,261 km²)		 State map highlighting Prowers County
Pueblo County 101 Pueblo 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for historic town of Pueblo. Pueblo is a Spanish word meaning village or people. &0000000000154538.000000154,538 &0000000000002396.7700002,396.77 sq mi
(&0000000000006208.0000006,208 km²)		 State map highlighting Pueblo County
Rio Blanco County 103 Meeker 1889-03-25 Split from Garfield County. Named for the White River, which was originally named el Rio Blanco in Spanish. &0000000000006227.0000006,227 &0000000000003226.2400003,226.24 sq mi
(&0000000000008356.0000008,356 km²)		 State map highlighting Rio Blanco County
Rio Grande County 105 Del Norte 1874-02-10 Split from Costilla County and Conejos County counties. Named for the Rio Grande, which flows through the area. &0000000000011627.00000011,627 &0000000000000913.100000913.10 sq mi
(&0000000000002365.0000002,365 km²)		 State map highlighting Rio Grande County
Routt County 107 Steamboat Springs 1877-01-29 Spilt from Grand County. Named in honor of John Long Routt, the first Governor of the State of Colorado. &0000000000022382.00000022,382 &0000000000002362.1100002,362.11 sq mi
(&0000000000006118.0000006,118 km²)		 State map highlighting Routt County
Saguache County 109 Saguache 1866-12-29 Split from Lake and Costilla counties. Name comes from a Ute language word meaning "blue earth" or "water at blue earth".[7] &0000000000006920.0000006,920 &0000000000003168.3200003,168.32 sq mi
(&0000000000008206.0000008,206 km²)		 State map highlighting Saguache County
San Juan County 111 Silverton 1876-01-31 Split from Lake County. Named for the San Juan River and San Juan Mountains, which in turn were named for Saint John the Evangelist. &0000000000000559.000000559 &0000000000000388.990000388.99 sq mi
(&0000000000001007.0000001,007 km²)		 State map highlighting San Juan County
San Miguel County 113 Telluride 1883-03-02 Split from San Juan County. Named for the San Miguel River and San Miguel Mountains, which in turn were named for Saint Michael the Archangel. &0000000000007533.0000007,533 &0000000000001290.7600001,290.76 sq mi
(&0000000000003343.0000003,343 km²)		 State map highlighting San Miguel County
Sedgwick County 115 Julesburg 1889-04-09 Split from Logan County. Named for Fort Sedgwick, which, in turn, was named for U.S. Army General John Sedgwick. &0000000000002340.0000002,340 &0000000000000548.830000548.83 sq mi
(&0000000000001421.0000001,421 km²)		 State map highlighting Sedgwick County
Summit County 117 Breckenridge 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for the many high mountain summits in the area. &0000000000026547.00000026,547 &0000000000000618.920000618.92 sq mi
(&0000000000001603.0000001,603 km²)		 State map highlighting Summit County
Teller County 119 Cripple Creek 1899-03-23 Split from El Paso and Fremont counties. Named in honor of Henry Moore Teller, a U.S. Senator from Colorado and United States Secretary of the Interior. &0000000000021824.00000021,824 &0000000000000558.580000558.58 sq mi
(&0000000000001447.0000001,447 km²)		 State map highlighting Teller County
Washington County 121 Akron 1887-02-09 Split from Weld County. Named in honor of George Washington, the first President of the United States. &0000000000004627.0000004,627 &0000000000002522.9000002,522.90 sq mi
(&0000000000006534.0000006,534 km²)		 State map highlighting Washington County
Weld County 123 Greeley 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of Lewis Ledyard Weld, the first Secretary of the Territory of Colorado. &0000000000243750.000000243,750 &0000000000004013.8400004,013.84 sq mi
(&0000000000010396.00000010,396 km²)		 State map highlighting Weld County
Yuma County 125 Wray 1889-03-15 Split from Washington County. Named for the Yuma Native American tribe. &0000000000009666.0000009,666 &0000000000002369.6100002,369.61 sq mi
(&0000000000006137.0000006,137 km²)		 State map highlighting Yuma County

Table of Colorado municipalities by county

Main article: Table of Colorado municipalities by county

Historic counties

The sortable table below lists all the historic counties of the Territory of New Mexico, the Territory of Utah, the Territory of Kansas, and the extralegal Territory of Jefferson that previously existed within the boundaries of the present State of Colorado, as well as the three defunct counties of the Territory of Colorado and the three defunct counties of the State of Colorado. The table includes the following information:

  • The official name of the county,
  • The territory or state,
  • The date the county was created,
  • The date the county was abolished or excluded from the Territory of Colorado, and
  • Historical notes.


Counties formerly within the State of Colorado
County Territory or State Created Superseded History
Taos County Territory of New Mexico 185201091852-01-09 186102281861-02-28 One of the seven partidos of the province of Nuevo México. One of the nine original counties created by the Territory of New Mexico in 1852. Excluded from the Territory of Colorado in 1861.
Great Salt Lake County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Iron County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Sanpete County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Utah County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Washington County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Green River County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Dissolved in 1857, but recreated in 1859. Excluded from the Territory of Colorado in 1861 and the Territory of Wyoming in 1868. Finally dissolved in 1872.
Arapahoe County Territory of Kansas 185508251855-08-25 186101291861-01-29 Created by the Territory of Kansas in 1855, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Beaver County Territory of Utah 185601051856-01-05 186102281861-02-28 Split from Iron and Millard counties in 1856. Excluded from the Territory of Colorado in 1861.
Broderick County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
El Paso County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Fremont County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Montana County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Oro County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Peketon County Territory of Kansas 185902071859-02-07 186101291861-01-29 Created by the Territory of Kansas in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Arrappahoe County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Cheyenne County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
El Paso County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Fountain County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Heele County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Jackson County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Jefferson County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Montana County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
North County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Park County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Saratoga County Territory of Jefferson 18591199November 1859 18610228