County Maps US

Montgomery County, Iowa

A county in Iowa, ranked 72 of 99 by population.

CountyFIPS 19137

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

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Population
10,002
-332 (-3.2%) since 2020
Land area
424.1
square miles. A further 0.2% of the total area is water
Population density
23.6
people per square mile, computed rather than published
County seat
Red Oak
Seat of county government.
Established
1851
174 years ago
Largest city
Red Oak city
Population 5,388.

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 Montgomery 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 Montgomery County, Iowa 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 623 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 Montgomery County ranks

Position among the 99 counties of Iowa, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IowaNationally
Population10,00272nd of 992,407th of 3,144
Land area424.1 sq mi90th of 992,389th of 3,144
Population density23.6 per sq mi57th of 992,105th of 3,144
Median household income$63,66681st of 991,737th of 3,143

Full data for Montgomery County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population10,002Vintage 2025 Population Estimates
Population in 202010,334Vintage 2025 Population Estimates
2020 estimates base?10,332Vintage 2025 Population Estimates
Land area424.1 sq mi2025 Gazetteer Files
Water area0.93 sq mi2025 Gazetteer Files
Total area425 sq mi2025 Gazetteer Files
Population density?23.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$63,666American Community Survey 2020-2024 5-Year Estimates
Median home value$121,400American Community Survey 2020-2024 5-Year Estimates
Median age43.5American Community Survey 2020-2024 5-Year Estimates
Households4,585American Community Survey 2020-2024 5-Year Estimates
Housing units5,005American 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
-77
99 births, 176 deaths
Net migration
+25
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 7 areas bordering Montgomery 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
Page CountyIowa24 mi14,856
Mills CountyIowa18 mi14,793
Adams CountyIowa18 mi3,617
Pottawattamie CountyIowa12 mi92,996
Cass CountyIowa12 mi12,960
Fremont CountyIowaa single point6,522
Taylor CountyIowaa single point5,835

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

All 99 counties of Iowa

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

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