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Carr is an unincorporated community and U.S. Post Office in Weld County, Colorado, United States. The ZIP Code of the Carr Post Office is 80612. Some consider Carr a ghost town.
The town of Carr was established by the Union Pacific Railroad in 1872. Carr was named for Robert E. Carr of the Union Pacific, who managed the construction of the rail line through the town. The Carr Post Office opened on March 26, 1872. 
Carr is located at 40°53′47″N 104°52′32″W / 40.89639°N 104.87556°W / 40.89639; -104.87556 (40.896257,-104.875488).