County Maps US

Platte County, Missouri

A county in Missouri, ranked 11 of 115 by population.

CountyFIPS 29165

Within Missouri
Platte County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data.

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Population
114,400
+7,213 (+6.7%) since 2020
Land area
419.8
square miles. A further 1.5% of the total area is water
Population density
272
people per square mile, computed rather than published
County seat
Platte City
Seat of county government.
Established
1838
187 years ago
Largest city
Kansas City city
Population 56,064 for the whole place, which extends beyond this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Platte County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Platte County, Missouri from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 783 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Platte County ranks

Position among the 115 counties of Missouri, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MissouriNationally
Population114,40011th of 115563rd of 3,144
Land area419.8 sq mi105th of 1152,414th of 3,144
Population density272 per sq mi9th of 115473rd of 3,144
Median household income$96,2272nd of 115207th of 3,143

Full data for Platte County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population114,400Vintage 2025 Population Estimates
Population in 2020107,187Vintage 2025 Population Estimates
2020 estimates base?106,724Vintage 2025 Population Estimates
Land area419.8 sq mi2025 Gazetteer Files
Water area6.5 sq mi2025 Gazetteer Files
Total area426.4 sq mi2025 Gazetteer Files
Population density?272 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$96,227American Community Survey 2020-2024 5-Year Estimates
Median home value$345,100American Community Survey 2020-2024 5-Year Estimates
Median age39.1American Community Survey 2020-2024 5-Year Estimates
Households43,902American Community Survey 2020-2024 5-Year Estimates
Housing units46,606American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+276
1,203 births, 927 deaths
Net migration
+1,092
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Platte County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Buchanan CountyMissouri27 mi83,540
Leavenworth CountyKansas25 mi84,590
Clay CountyMissouri20 mi265,032
Wyandotte CountyKansas12 mi170,597
Atchison CountyKansas11 mi16,172
Clinton CountyMissouri5.1 mi21,661

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 115 counties of Missouri

Open the interactive Missouri county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.