Hampden County, Massachusetts
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Massachusetts's location within the U.S.
|Named for||John Hampden|
|• Total||634 sq mi (1,640 km2)|
|• Land||617 sq mi (1,600 km2)|
|• Water||17 sq mi (40 km2) 2.7%%|
| • Estimate |
|• Density||751/sq mi (290/km2)|
|Time zone||UTC−5 (Eastern)|
|• Summer (DST)||UTC−4 (EDT)|
|Congressional districts||1st, 2nd|
Hampden County is a county in the U.S. state of Massachusetts. As of the 2010 census, the population was 463,490. As of 2018, the population is estimated to be 470,406. The county seat is Springfield.