County Maps US

Dallas County, Missouri

A county in Missouri, ranked 61 of 115 by population.

CountyFIPS 29059

Within Missouri
Dallas County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Buffalo, the county seat, located via the 2025 Census Gazetteer.

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Population
18,025
+892 (+5.2%) since 2020
Land area
541
square miles. A further 0.3% of the total area is water
Population density
33.3
people per square mile, computed rather than published
County seat
Buffalo
Seat of county government.
Established
1841
184 years ago
Largest city
Buffalo city
Population 3,550.

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 Dallas 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 Dallas 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 485 by 800 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 Dallas 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
Population18,02561st of 1151,938th of 3,144
Land area541 sq mi70th of 1151,931st of 3,144
Population density33.3 per sq mi53rd of 1151,830th of 3,144
Median household income$53,46485th of 1152,565th of 3,143

Full data for Dallas County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population18,025Vintage 2025 Population Estimates
Population in 202017,133Vintage 2025 Population Estimates
2020 estimates base?17,071Vintage 2025 Population Estimates
Land area541 sq mi2025 Gazetteer Files
Water area1.9 sq mi2025 Gazetteer Files
Total area542.9 sq mi2025 Gazetteer Files
Population density?33.3 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$53,464American Community Survey 2020-2024 5-Year Estimates
Median home value$190,300American Community Survey 2020-2024 5-Year Estimates
Median age41.7American Community Survey 2020-2024 5-Year Estimates
Households6,768American Community Survey 2020-2024 5-Year Estimates
Housing units7,613American 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
-34
207 births, 241 deaths
Net migration
+203
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 Dallas 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
Laclede CountyMissouri29 mi36,943
Polk CountyMissouri28 mi33,604
Webster CountyMissouri17 mi43,054
Hickory CountyMissouri13 mi9,044
Camden CountyMissouri12 mi44,047
Greene CountyMissouri6.0 mi309,286

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.