Platte County, Missouri

county in Missouri, United States

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.[1] Its county seat is Platte City.[2]

Platte County
Platte County Courthouse
Platte County Courthouse
Map of Missouri highlighting Platte County
Location within the U.S. state of Missouri
Map of the United States highlighting Missouri
Missouri's location within the U.S.
Coordinates: 39°23′N 94°46′W / 39.38°N 94.77°W / 39.38; -94.77
Country United States
State Missouri
FoundedDecember 31, 1838
Named forPlatte River or Platte Purchase
SeatPlatte City
Largest cityKansas City
 • Total427 sq mi (1,110 km2)
 • Land420 sq mi (1,100 km2)
 • Water6.6 sq mi (17 km2)  1.5%
 • Total89,322
 • Estimate 
 • Density210/sq mi (81/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district6th


  1. "State & County QuickFacts". United States Census Bureau. Archived from the original on June 24, 2011. Retrieved September 12, 2013.
  2. "Find a County". National Association of Counties. Retrieved 2011-06-07.