There are 19 US Post Offices in Niagara County serving a total of 221,290 residents equating to 11,647 residents per post office. It's estimated that approximately 353,204 packages are handled across the 19 county post offices annually. Niagara County is a county located in the U.S. state of New York. As of the 2010 census, the population was 216,469. The county seat is Lockport. The county name is from the Iroquois word Onguiaahra; meaning the strait or thunder of waters.\\ Niagara County is part of the Buffalo-Niagara Falls metropolitan area, and across the Canada\u2013US border is the province of Ontario. It is the location of Niagara Falls and Fort Niagara, and has many parks and lake shore recreation communities. In the Summer of 2008 Niagara County celebrated its 200th Birthday with the first town of the county, Town of Cambria."