There are 10 US Post Offices in Nevada County serving a total of 74,391 residents equating to 7,439 residents per post office. It's estimated that approximately 118,736 packages are handled across the 10 county post offices annually. Nevada County is a county located in the Sierra Nevada of California. As of the 2010 census, the population was 98,764. The county seat is Nevada City. Nevada County comprises the Truckee-Grass Valley, CA Micropolitan Statistical Area, which is also included in the Sacramento-Roseville, CA Combined Statistical Area. It is located in the Mother Lode Country."