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. Today, just a few old houses remain plus the school house and a few old store fronts. Aside from that there are scattered old foundations throughout the town. There are a few year-round residents but for the most part the town is abandoned.