I’ve covered over half of the United States now in creating pages for genealogy resources online. I haven’t proceeded in any particular order and the project is continuing in a somewhat random path.
Colorado isn’t a big state population-wise, but it did have its fair share of settlers passing through, or arriving and staying, on westward treks.
Colorado is also one of the more difficult states from which to obtain vital records, as I’ve been told by friends who had family living there at one time or another. For example, there is a lengthy list of restrictions on obtaining death records.
Where would I begin if researching an ancestor in Colorado?:
FamilySearch Research Wiki for Colorado – The wiki has links to all of Colorado’s counties as well as for information on obtaining vital records. There are also links to info about migration routes through Colorado and to other resources.
COGenWeb – GenWeb is manned and supported by volunteers who contribute genealogical information. Sometimes the info is quite unique. Some counties are well represented with lots of contributed material, while others are sparse. It’s definitely worth a visit and it’s free.
Colorado Genealogical Society– Scroll down past the boxed table and there are links to societies, government offices, and much more
Colorado Genealogical Society – Facebook page
Denver Public Library– Photos, which can be browsed and some apparently can be purchased for use
Denver Public Library – Genealogy links and other website resources
Denver Public Library – Digital Collections
Pikes Peak Library District – links to regional history and genealogy
Colorado State Archives – genealogy holdings and links
History Colorado Online Collection
Colorado Historic Cemetery Association
RAOGK – Colorado Archives, Historical and Genealogical Societies
Colorado Historic Newspaper Collection
Colorado State Archives and Libraries
University of Colorado – Digital Library
Colorado State University – Digital Collections
Chronicling America – includes Colorado historical newspapers
Free Colorado Digital Archives for Genealogy on Sassy Jane Genealogy Blog
University of Northern Colorado – Digital Archives
These should get you started. However, be sure to check local libraries in counties and towns of interest.
Also, the National Archives has a facility in Denver.