Hampden County, Massachusetts

42°08′N 72°38′W / 42.14°N 72.63°W / 42.14; -72.63

Hampden County
County
Hampden County Courthouse in Springfield
Seal
Location within the U.S. state of Massachusetts
Massachusetts's location within the U.S.
Coordinates: 42°07′39″N 72°34′17″W / 42.12756°N 72.571312°W / 42.12756; -72.571312
Country	United States
State	Massachusetts
Founded	1 August 1812
Named for	John Hampden
Seat	Springfield
Largest city	Springfield
Area
• Total	634 sq mi (1,640 km2)
• Land	617 sq mi (1,600 km2)
• Water	17 sq mi (40 km2)  2.7%
Population  (2020)
• Total	465,825
• Density	755/sq mi (292/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional districts	1st, 2nd

Hampden County is a non-governmental county located in the Pioneer Valley of the U.S. state of Massachusetts, in the United States. As of the 2020 census, Hampden County's population was 465,825. Its traditional county seat is Springfield,^[1] the Connecticut River Valley's largest city, and economic and cultural capital; with an estimated population of 154,758, approximately one-third of Hampden County residents live in Springfield.