Jeannette is a city in Westmoreland County, Pennsylvania, United States. Jeannette was founded in 1888. The city got its name from one of the original city fathers, H. Sellers McKee, who wished to honor his wife by giving the new town her first name: Jeannette. The city celebrated its 125th anniversary in July 2013. The population was 9,654 according to the 2010 census.