Montgomery County, located in southeastern Pennsylvania, was established on September 10, 1784, from land originally part of Philadelphia County. The county seat is Norristown, and the area spans approximately 487 square miles. With an estimated population of 868,742 in 2024, Montgomery County is the third-most populous county in Pennsylvania and part of the Philadelphia metropolitan region. The county operates under a three-member Board of Commissioners, which serves as both the legislative and executive authority. Montgomery County is known for its strong economy, ranking among the wealthiest counties in the state, and features major employment sectors such as healthcare, education, finance, and technology. It is home to Valley Forge National Historical Park and the King of Prussia Mall, one of the largest shopping centers in the U.S. The county emphasizes diversity, sustainability, and economic development through initiatives like MontcoWorks, its workforce development board.