Sterling, Colorado is in Northeast Colorado. The City website notes about Sterling:
Known as the Queen City of the Plains, Sterling is located in Logan County in the Northeastern corner of Colorado on Interstate 76. Having the largest population, estimated at approximately 13,900, of those communities in Colorado east of Pueblo, Sterling is the regional shopping hub for Northeast Colorado and Southwest Nebraska.
Sterling does not appear to have many organized retirement communities. Please let us know if you know of some!
http://www.zillow.com/ has more detail for home prices in Colorado
Colorado Taxes: http://www.revenue.state.co.us/
Sterling Regional Medcenter http://www.bannerhealth.com/
615 Fairhurst Street, Sterling - (970) 522-0122
Travel and tourism: http://www.sterlingcolo.com/ http://www.logancountychamber.com/