County Maps US

Fremont County, Iowa

A county in Iowa, ranked 94 of 99 by population.

CountyFIPS 19071

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

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Population
6,522
-53 (-0.8%) since 2020
Land area
511.2
square miles. A further 1.1% of the total area is water
Population density
12.8
people per square mile, computed rather than published
County seat
Sidney
Seat of county government.
Established
1847
178 years ago
Largest city
Sidney city
Population 1,051.

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 Fremont 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 Fremont 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 670 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 Fremont 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
Population6,52294th of 992,699th of 3,144
Land area511.2 sq mi68th of 992,037th of 3,144
Population density12.8 per sq mi92nd of 992,469th of 3,144
Median household income$71,62146th of 991,077th of 3,143

Full data for Fremont County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population6,522Vintage 2025 Population Estimates
Population in 20206,575Vintage 2025 Population Estimates
2020 estimates base?6,609Vintage 2025 Population Estimates
Land area511.2 sq mi2025 Gazetteer Files
Water area5.5 sq mi2025 Gazetteer Files
Total area516.6 sq mi2025 Gazetteer Files
Population density?12.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$71,621American Community Survey 2020-2024 5-Year Estimates
Median home value$154,400American Community Survey 2020-2024 5-Year Estimates
Median age46.8American Community Survey 2020-2024 5-Year Estimates
Households2,823American Community Survey 2020-2024 5-Year Estimates
Housing units3,125American 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
-23
59 births, 82 deaths
Net migration
+52
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 Fremont 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 CountyIowa23 mi14,856
Mills CountyIowa22 mi14,793
Atchison CountyMissouri21 mi5,175
Otoe CountyNebraska19 mi16,531
Cass CountyNebraska9.6 mi27,657
Montgomery CountyIowaa single point10,002

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.