County Maps US

Delaware County, Iowa

A county in Iowa, ranked 40 of 99 by population.

CountyFIPS 19055

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

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Population
17,674
+218 (+1.2%) since 2020
Land area
577.7
square miles. A further 0.2% of the total area is water
Population density
30.6
people per square mile, computed rather than published
County seat
Manchester
Seat of county government.
Established
1837
188 years ago
Largest city
Manchester city
Population 5,357.

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 Delaware 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 Delaware 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 794 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 Delaware 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
Population17,67440th of 991,953rd of 3,144
Land area577.7 sq mi33rd of 991,709th of 3,144
Population density30.6 per sq mi39th of 991,911th of 3,144
Median household income$74,98928th of 99841st of 3,143

Full data for Delaware County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population17,674Vintage 2025 Population Estimates
Population in 202017,456Vintage 2025 Population Estimates
2020 estimates base?17,481Vintage 2025 Population Estimates
Land area577.7 sq mi2025 Gazetteer Files
Water area1.2 sq mi2025 Gazetteer Files
Total area578.9 sq mi2025 Gazetteer Files
Population density?30.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$74,989American Community Survey 2020-2024 5-Year Estimates
Median home value$177,900American Community Survey 2020-2024 5-Year Estimates
Median age43.4American Community Survey 2020-2024 5-Year Estimates
Households7,369American Community Survey 2020-2024 5-Year Estimates
Housing units8,169American 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
-11
199 births, 210 deaths
Net migration
+85
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 Delaware 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
Buchanan CountyIowa25 mi20,883
Dubuque CountyIowa24 mi99,381
Clayton CountyIowa24 mi16,845
Linn CountyIowa12 mi232,028
Jones CountyIowa12 mi21,253
Fayette CountyIowaa single point19,047

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.