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state of colorado

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Colorado Territory
Organized: February 28, 1861
Statehood: August 1, 1876

The state was named after the Spanish word "Colorado," which means "reddish colored" that presumably refers to the red sandstone formations in the area or reddish brown color of the Colorado River.

The territory that ultimately became Colorado was added to the United States by the 1803 Louisiana Purchase and the 1848 Mexican Cession. The Colorado Gold Rush of 1859 brought many settlers to the Denver area, though the population collapsed following an initial mining boom.

The Colorado Territory was organized as a United States territory on February 28, 1861, and Colorado attained statehood August 1, 1876, 100 years after the signing of our nation's Declaration of Independence (earning it the nickname the "Centennial State")

Colorado Counties

Colorado Counties

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Types of Data We're Looking to Post
Send transcribed biographies, obituaries, vital records, census records, newspaper gleanings, military records, or if you have walked cemeteries and have transcribed those names and dates,and any other type of data you think would be helpful to researchers .

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Books about Colorado

Biographies for unspecified counties

Representative Women of Colorado

Census Data

Colorado Outlaws

Colorado Emblems

County Organization Dates

Facts and Trivia




Man Made Marvels in Colorado


Military Records

Native American

Newspaper Gleanings


Resource Links

Defunct Counties

Greenwood County - formed in 1870 from part of Huerfano county and the Arapahoe and Cheyenne Reserve. In 1874 it was abolished and Bent and Elbert counties created. History in 1871.

Platte County - formed in 1872 from part of Weld county. In 1874 was abolished and its territory returned to Weld county.

More extinct or renamed countiesThe City of Aurora, which is currently located in two counties - Arapahoe, and Adams, is scheduled to become a consolidated city-county (joining Denver and Broomfield as the only city-counties in the state) around 2008

Colorado National Parks
National parks managed by the National Park Service:

  • Black Canyon of the Gunnison National Park near Montrose
  • Mesa Verde National Park near Cortez
  • Rocky Mountain National Park at Estes Park
  • Great Sand Dunes National Park and Preserve near Mosca

National monuments in Colorado are:

  • Colorado National Monument at Grand Junction and Fruita
  • Dinosaur National Monument near Dinosaur Florissant Fossil Beds National Monument in Florissant
  • Yucca House National Monument in Cortez

National Historic Sites:

  • Bent's Old Fort National Historic Site near La Junta
  • Sand Creek Massacre National Historic Site in Kiowa County

National Historic Trails

  • California National Historic Trail
  • Old Spanish National Historic Trail
  • Pony Express National Historic Trail
  • Santa Fe National Historic Trail

The Colorado Fourteeners

  • 53 Colorado summits with at least 14,000 feet (4,267.2 m) of elevation and at least 300 feet (91,44 m) of prominence



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