County Maps US

Allen County, Indiana

The largest of Indiana's 92 counties by land area.

CountyFIPS 18003

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

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Population
402,329
+16,222 (+4.2%) since 2020
Land area
657.1
square miles. A further 0.4% of the total area is water
Population density
612
people per square mile, computed rather than published
County seat
Fort Wayne
Seat of county government.
Established
1824
201 years ago
Largest city
Fort Wayne city
Population 275,203.

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 Allen 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 Allen County, Indiana 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 712 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 Allen County ranks

Position among the 92 counties of Indiana, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IndianaNationally
Population402,3293rd of 92190th of 3,144
Land area657.1 sq mi1st of 921,429th of 3,144
Population density612 per sq mi5th of 92235th of 3,144
Median household income$70,73738th of 921,144th of 3,143

Full data for Allen County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population402,329Vintage 2025 Population Estimates
Population in 2020386,107Vintage 2025 Population Estimates
2020 estimates base?385,417Vintage 2025 Population Estimates
Land area657.1 sq mi2025 Gazetteer Files
Water area2.8 sq mi2025 Gazetteer Files
Total area660 sq mi2025 Gazetteer Files
Population density?612 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$70,737American Community Survey 2020-2024 5-Year Estimates
Median home value$214,900American Community Survey 2020-2024 5-Year Estimates
Median age36.2American Community Survey 2020-2024 5-Year Estimates
Households156,570American Community Survey 2020-2024 5-Year Estimates
Housing units166,285American 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
+1,510
5,156 births, 3,646 deaths
Net migration
+1,696
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 9 areas bordering Allen 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
DeKalb CountyIndiana20 mi44,535
Whitley CountyIndiana19 mi35,046
Paulding CountyOhio18 mi18,727
Adams CountyIndiana14 mi36,650
Wells CountyIndiana14 mi28,883
Huntington CountyIndiana6.1 mi37,224
Noble CountyIndiana6.0 mi47,937
Van Wert CountyOhio4.6 mi29,013
Defiance CountyOhio1.3 mi38,292

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

All 92 counties of Indiana

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

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