Colorado Territorial History and the Evolution of Its Counties
The formation of the Colorado Territory was a complex administrative process, as the land was carved from four existing organized territories: Kansas to the southeast, New Mexico to the south, Utah to the west, and Nebraska to the northeast. Long before Colorado became its own entity, these neighboring territories established county boundaries that overlapped with what is now the modern state of Colorado.
Key Facts
- Colorado Territory was officially established by law on February 28, 1861.
- The extralegal Territory of Jefferson exercised effective control over the region for approximately 18 months.
- Early jurisdictions were managed by the territories of New Mexico, Utah, and Kansas.
- Nebraska Territory held a portion of the future Colorado land but organized no counties within it.
- The first Federal governor of Colorado, William Gilpin, arrived in Denver in late May 1861.
Early Jurisdictions: The Neighboring Territories
New Mexico Territory
The southern regions of modern Colorado were initially under the jurisdiction of New Mexico. Taos County, originally one of the seven partidos (administrative districts) of the Spanish and later Mexican province of Nuevo México, was one of the nine original counties created by the U.S. Territory of New Mexico on January 29, 1852. Its jurisdiction over Colorado ended in 1861. Additionally, Mora County, which split from Taos and San Miguel counties on February 1, 1860, also ceased its jurisdiction over Colorado in 1861.
Utah Territory
On March 3, 1852, the Utah Territory organized several counties with boundaries extending into western Colorado. These included Great Salt Lake, Iron, Sanpete, Utah, and Washington counties. All of these ceased their jurisdiction upon the legal organization of the Colorado Territory on February 28, 1861.
Other notable Utah-created entities included Beaver County, formed on January 5, 1856, and Green River County. Green River County had a volatile history: created in 1852, dissolved in 1857, recreated in 1859, and finally dissolved in 1872 after losing land to both Colorado and Wyoming territories.
Kansas Territory
The western reaches of the Kansas Territory included the mining hubs of Aurora and Pike's Peak. While Kansas provided for several counties—most notably the massive Arapahoe County, proclaimed on August 25, 1855—none were actually organized before Kansas achieved statehood on January 29, 1861.
On February 7, 1859, several "daughter" counties were split from Arapahoe, including Broderick, El Paso, Fremont, Montana, and Oro. Additionally, Peketon County was created that same day. Because none were organized, they all reverted to unorganized territory when Kansas joined the Union.
The Provisional Territory of Jefferson
In a unique chapter of regional history, the extralegal Territory of Jefferson was established. On November 28, 1859, its Provisional General Assembly created 12 counties to manage the region. Although the federal government did not officially recognize this government due to national debates over slavery, the Territory of Jefferson maintained effective control for a year and a half.
The Jefferson government disbanded on June 6, 1861, shortly after Governor William Gilpin arrived in Denver. Many of the boundaries established by the Jefferson government were later adopted by the official Colorado territorial legislature in November 1861.
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Evolution of Counties within Colorado
Once the Colorado Territory and subsequent state were established, several counties were created, renamed, or abolished over time.
Territorial Era Changes
- Guadalupe County: Created in November 1861, it was renamed Conejos County after only six days.
- Greenwood County: Formed in 1870 from Huerfano County and tribal lands, it was abolished in 1874 and split between Elbert and Bent counties.
- Platte County: Created in 1872 from Weld County, it was abolished in 1874 after failing to secure voter approval.
Statehood Era Changes
- Carbonate County: Lake County was renamed Carbonate County for two days in February 1879 before being split into Chaffee County and a restored Lake County.
- Uncompaghre County: Ouray County was renamed Uncompaghre County for four days in 1883.
- South Arapahoe County: Created in 1902, this county's name was changed back to Arapahoe County in April 1903.
| Originating Entity | Key Counties/Regions | Status/Outcome |
|---|---|---|
| New Mexico Territory | Taos, Mora | Jurisdiction ended 1861 |
| Utah Territory | Iron, Sanpete, Washington, etc. | Jurisdiction ended 1861 |
| Kansas Territory | Arapahoe, El Paso, Fremont, etc. | Reverted to unorganized territory 1861 |
| Territory of Jefferson | 12 Provisional Counties | Disbanded June 6, 1861 |
| Nebraska Territory | N/A | No counties organized |
Frequently Asked Questions
Which territories contributed land to the formation of Colorado?
Colorado Territory was formed from lands previously belonging to the Kansas, New Mexico, Utah, and Nebraska territories.
What was the Territory of Jefferson?
The Territory of Jefferson was an extralegal, provisional government that held effective control over the region for about 18 months before the official Colorado territorial government was established.
Why did the Kansas Territory counties revert to unorganized territory?
Counties like Arapahoe and its derivatives were proclaimed but never officially organized; therefore, they reverted to unorganized status when Kansas achieved statehood in 1861.
Who was the first Federal governor of the Colorado Territory?
The first Federal governor was William Gilpin, who arrived in Denver in late May 1861.
Which Colorado county existed for only six days?
Guadalupe County existed from November 1 to November 7, 1861, before being renamed Conejos County.