There are 13 US Post Offices in Ottawa County serving a total of 39,115 residents equating to 3,009 residents per post office. It's estimated that approximately 62,432 packages are handled across the 13 county post offices annually. Ottawa County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 41,428. Its county seat is Port Clinton. The county is named either for the Ottawa Indians who lived there, or for an Indian word meaning \"trader\". Ottawa County comprises the Port Clinton, OH Micropolitan Statistical Area, which is also included in the Toledo-Port Clinton, OH Combined Statistical Area."