There are 1 US Post Offices in Oneida County serving a total of 4,154 residents equating to 4,154 residents per post office. It's estimated that approximately 6,630 packages are handled across the 1 county post offices annually. Oneida County is a county located in the U.S. state of Idaho. As of the 2010 Census the county had a population of 4,286. The county seat and largest city is Malad City. Most of the county's population lives in Malad City and the surrounding Malad Valley."