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Montgomery County is a county in the Commonwealth of Pennsylvania. It is the third-most populous county in Pennsylvania and the 73rd-most populous county in the United States. As of the 2020 census, the population of the county was 856,553, representing a 7.1% increase from the 799,884 residents counted in the 2010 census.[1] Montgomery County is located adjacent to and northwest of Philadelphia. The county seat and largest city is Norristown.[2] Montgomery County is geographically diverse, ranging from farms and open land in the extreme north of the county to densely populated suburban neighborhoods in the southern and central portions of the county.

Montgomery County is included in the Philadelphia-Camden-Wilmington PA-NJ-DE-MD metropolitan statistical area, sometimes expansively known as the Delaware Valley. The county marks part of the Delaware Valley's northern border with the Lehigh Valley region of Pennsylvania. In 2010, Montgomery County was the 66th-wealthiest county in the country by median household income. The county borders Philadelphia, the nation's sixth-largest city, to its southeast.

The county was created on September 10, 1784, out of land originally part of Philadelphia County. The first courthouse was housed in the Barley Sheaf Inn. It is believed to have been named either for Richard Montgomery, an American Revolutionary War general killed in 1775 while attempting to capture Quebec City, or for the Welsh county of Montgomeryshire, which was named after one of William the Conqueror's main counselors, Roger de Montgomerie since it was part of the Welsh Tract, an area of Pennsylvania settled by Quakers from Wales.[3] Early histories of the county indicate the origin of the county's name as uncertain.