County Maps US

Putnam County, Missouri

A county in Missouri, ranked 110 of 115 by population.

CountyFIPS 29171

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

Download SVGFull Missouri map downloads

Population
4,546
-140 (-3.0%) since 2020
Land area
517.3
square miles. A further 0.4% of the total area is water
Population density
8.8
people per square mile, computed rather than published
County seat
Unionville
Seat of county government.
Established
1845
180 years ago
Largest city
Unionville city
Population 1,663.

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 Putnam 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 Putnam 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 412 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 Putnam 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
Population4,546110th of 1152,853rd of 3,144
Land area517.3 sq mi76th of 1152,017th of 3,144
Population density8.8 per sq mi110th of 1152,609th of 3,144
Median household income$63,51041st of 1151,753rd of 3,143

Full data for Putnam County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population4,546Vintage 2025 Population Estimates
Population in 20204,686Vintage 2025 Population Estimates
2020 estimates base?4,676Vintage 2025 Population Estimates
Land area517.3 sq mi2025 Gazetteer Files
Water area2.3 sq mi2025 Gazetteer Files
Total area519.6 sq mi2025 Gazetteer Files
Population density?8.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$63,510American Community Survey 2020-2024 5-Year Estimates
Median home value$119,500American Community Survey 2020-2024 5-Year Estimates
Median age45.9American Community Survey 2020-2024 5-Year Estimates
Households1,791American Community Survey 2020-2024 5-Year Estimates
Housing units2,834American 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
+18
80 births, 62 deaths
Net migration
-35
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 Putnam 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
Schuyler CountyMissouri42 mi4,140
Sullivan CountyMissouri30 mi5,738
Appanoose CountyIowa20 mi12,077
Wayne CountyIowa15 mi6,738
Mercer CountyMissouri14 mi3,404
Adair CountyMissouri9.1 mi25,684

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.