List of United States post offices in Colorado
United States post offices operate under the authority of the United States Post Office Department (1792–1971) or the United States Postal Service (since 1971). Historically, post offices were usually placed in a prominent location and many were architecturally distinctive, including notable buildings featuring Beaux-Arts, Art Deco, and Vernacular architecture.
Source: Wikipedia — List of United States post offices in Colorado (CC BY-SA 4.0)