Some of the cities, towns, and places in Montgomery County are Abington, Ambler, Arcadia University, Ardmore, Audubon, Bala Cynwyd, Bethayres, Blue Bell, Bridgeport, Bryn Athyn, Bryn Mawr, Bucks County, Cheltenham Township, Collegeville, Conshohocken, Douglass, Dresher, Eagleville, East Greenville, East Norriton, Elkins Park, Evansburg, Flourtown, Fort Washington, Franconia, Frederick, Gilbertsville, Gladwyne, Glenside, Graterford, Green Lane, Gwynedd, Gwynedd Valley, Halfway House, Harleysville, Hatboro, Hatfield, Haverford College, Horsham, Horsham Township, Huntingdon Valley, Jenkintown, King of Prussia, Kulpsville, Lafayette Hill, Lansdale, Lederach, Limerick, Linfield, Lower Frederick, Lower Gwynedd, Lower Merion, Lower Moreland, Lower Pottsgrove, Lower Providence, Lower Salford, Maple Glen, Marlborough, Meadowbrook, Melrose Park, Merion, Mont Clare, Montgomery, Montgomeryville, Narberth, New Hanover, Norristown, North Wales, Oaks, Oreland, Penn Wynne, Pennsburg, Perkiomen, Plymouth, Plymouth Meeting, Plymouth Township, Port Providence, Pottsgrove, Pottstown, Red Hill, Rockledge, Rosemont, Pennsylvania, Royersford, Salford, Sanatoga, Schwenksville, Skippack, Souderton, Spring House, Spring Mount, Springfield, Stowe, Telford, Towamencin, Trappe, Trooper, Upper Dublin, Upper Frederick, Upper Gwynedd, Upper Hanover, Upper Merion, Upper Moreland, Upper Pottsgrove, Upper Providence, Upper Salford, Villanova, West Conshohocken, West Norriton, West Pottsgrove, Whitemarsh, Whitemarsh Township, Whitpain, Willow Grove, Worcester, Woxall, Wyncote, Wyndmoor, Wynnewood
Montgomery County is the third-most populous county in the Commonwealth of Pennsylvania, and the 73rd-most populous in the United States. As of 2019, the census-estimated population of the county was 830,915, representing a 3.9% increase from the 799,884 residents enumerated in the 2010 census. Montgomery County is located adjacent to and northwest of Philadelphia. The county seat and largest city is Norristown. 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 51st-wealthiest county in the country by median household income. In 2008, the county was named the 9th Best Place to Raise a Family by Forbes.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), as it was part of the Welsh Tract, an area of Pennsylvania settled by Quakers from Wales. Early histories of the county indicate the origin of the county's name as uncertain.