There are 31 US Post Offices in Lane County serving a total of 364,821 residents equating to 11,768 residents per post office. It's estimated that approximately 582,295 packages are handled across the 31 county post offices annually. Lane County is a county located in the U.S. state of Oregon. As of the 2010 census, the population was 351,715, making it the fourth-most populous county in Oregon. The county seat is Eugene. It is named in honor of Joseph Lane, Oregon's first territorial governor. Lane County comprises the Eugene, OR Metropolitan Statistical Area. It is the third largest MSA in Oregon, and the 144th largest in the country."