There are 15 US Post Offices in Larimer County serving a total of 202,060 residents equating to 13,471 residents per post office. It's estimated that approximately 322,510 packages are handled across the 15 county post offices annually. Larimer County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 299,630. The county seat and most populous city is Fort Collins. The county was named for William Larimer, Jr., the founder of Denver. Larimer County comprises the Fort Collins, CO Metropolitan Statistical Area. The county is located at the northern end of the Front Range, at the edge of the Colorado Eastern Plains along the border with Wyoming.