There are 10 US Post Offices in Lee County serving a total of 35,309 residents equating to 3,531 residents per post office. It's estimated that approximately 56,357 packages are handled across the 10 county post offices annually. Lee County, Iowa, was established in 1836. As of the 2010 census, the population was 35,862. It has two county seats \u2014 Fort Madison and Keokuk. Lee County is part of the Fort Madison\u2013Keokuk, IA-IL-MO Micropolitan Statistical Area."