Platte County, Missouri
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Platte County Courthouse
Location within the U.S. state of Missouri
Missouri's location within the U.S.
|Founded||December 31, 1838|
|Named for||Platte River or Platte Purchase|
|Largest city||Kansas City|
|• Total||427 sq mi (1,110 km2)|
|• Land||420 sq mi (1,100 km2)|
|• Water||6.6 sq mi (17 km2) 1.5%|
| • Estimate |
|• Density||210/sq mi (81/km2)|
|Time zone||UTC−6 (Central)|
|• Summer (DST)||UTC−5 (CDT)|
Platte County is a county located in the northwestern portion of the U.S. state of Missouri and is part of the Kansas City metropolitan area. As of the 2010 census, the population was 89,322. Its county seat is Platte City.