There are 29 US Post Offices in Wake County serving a total of 776,028 residents equating to 26,760 residents per post office. It's estimated that approximately 1,238,627 packages are handled across the 29 county post offices annually. Wake County is a county in the US state of North Carolina. As of July 1, 2015, the population was 1,024,198, making it North Carolina's second-most populated county. Wake County is the 9th fastest-growing county in the United States, with the town of Cary and the city of Raleigh being the 8th and 15th fastest-growing cities, respectively. Its county seat is Raleigh, which is also the state capital. Eleven other municipalities are in Wake County, the largest of which is Cary, the third largest city of the Research Triangle region and the seventh largest municipality in North Carolina. It is governed by the Wake County Board of Commissioners, coterminous with the Wake County Public School System school district, with law enforcement provided by the Wake County Sheriff's Department. It is also part of the wider Triangle J Council of Governments which governs regional planning."