There are 19 US Post Offices in Merced County serving a total of 224,642 residents equating to 11,823 residents per post office. It's estimated that approximately 358,554 packages are handled across the 19 county post offices annually. Merced County (/m\u0259r\u02c8s\u025bd/ m\u0259r-SED), is a county located in the northern San Joaquin Valley section of the Central Valley, in the U.S. state of California. As of the 2010 census, the population was 255,793. The county seat is Merced. The county is named after the Merced River. Merced County comprises the Merced, CA Metropolitan Statistical Area, which is included in the Modesto-Merced, CA Combined Statistical Area. It is located north of Fresno County and Fresno, and southeast of Santa Clara County and San Jose."