County Maps US

DeKalb County, Missouri

A county in Missouri, ranked 87 of 115 by population.

CountyFIPS 29063

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

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Population
9,795
-1,810 (-15.6%) since 2020
Land area
421.4
square miles. A further 1.0% of the total area is water
Population density
23.2
people per square mile, computed rather than published
County seat
Maysville
Seat of county government.
Established
1845
180 years ago
Largest city
Cameron city
Population 2,222 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 DeKalb 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 DeKalb 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 765 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 DeKalb 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
Population9,79587th of 1152,425th of 3,144
Land area421.4 sq mi103rd of 1152,403rd of 3,144
Population density23.2 per sq mi69th of 1152,120th of 3,144
Median household income$69,82622nd of 1151,207th of 3,143

Full data for DeKalb County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population9,795Vintage 2025 Population Estimates
Population in 202011,605Vintage 2025 Population Estimates
2020 estimates base?11,029Vintage 2025 Population Estimates
Land area421.4 sq mi2025 Gazetteer Files
Water area4.5 sq mi2025 Gazetteer Files
Total area425.8 sq mi2025 Gazetteer Files
Population density?23.2 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$69,826American Community Survey 2020-2024 5-Year Estimates
Median home value$169,200American Community Survey 2020-2024 5-Year Estimates
Median age42.2American Community Survey 2020-2024 5-Year Estimates
Households3,732American Community Survey 2020-2024 5-Year Estimates
Housing units4,270American 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
-49
91 births, 140 deaths
Net migration
-38
More people moved out than moved in.

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

The 6 areas bordering DeKalb 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
Clinton CountyMissouri21 mi21,661
Gentry CountyMissouri21 mi6,384
Daviess CountyMissouri18 mi8,558
Andrew CountyMissouri15 mi18,241
Buchanan CountyMissouri5.0 mi83,540
Caldwell CountyMissouri3.0 mi9,012

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.