There are 15 US Post Offices in Cache County serving a total of 112,291 residents equating to 7,486 residents per post office. It's estimated that approximately 179,229 packages are handled across the 15 county post offices annually. Cache County is a county located in the U.S. state of Utah. As of the 2010 Census the population was 112,656. Its county seat and largest city is Logan. The county was created in 1856 and organized the next year. It was named for the fur stashes made by many of the Rocky Mountain Fur Company trappers. The Cache Valley and surrounding mountains are located in the county, which reaches up to the Idaho border. The Bear River Mountains, the northernmost extension of the Wasatch Range, which reach as high as 10,000 feet (3048 m), cover the eastern half of the county. The Bear River flows through Cache Valley. Wellsville was the first European settlement in the county, settled by Peter Maughan in 1853. Cache County is included in the Logan, UT-ID Metropolitan Statistical Area."