There are 8 US Post Offices in Delta County serving a total of 30,070 residents equating to 3,759 residents per post office. It's estimated that approximately 47,995 packages are handled across the 8 county post offices annually. Delta County is one of the 64 counties of the U.S. state of Colorado. As of the 2010 census, the population was 30,952. The county seat is Delta."