County Maps US

Bonneville County, Idaho

A county in Idaho, ranked 4 of 44 by population.

CountyFIPS 16019

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

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Population
135,771
+11,041 (+8.9%) since 2020
Land area
1,866
square miles. A further 1.8% of the total area is water
Population density
72.8
people per square mile, computed rather than published
County seat
Idaho Falls
Seat of county government.
Established
1911
114 years ago
Largest city
Idaho Falls city
Population 71,785.

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 Bonneville 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 Bonneville County, Idaho 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 490 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 Bonneville County ranks

Position among the 44 counties of Idaho, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IdahoNationally
Population135,7714th of 44489th of 3,144
Land area1,866 sq mi15th of 44310th of 3,144
Population density72.8 per sq mi6th of 441,151st of 3,144
Median household income$79,0686th of 44618th of 3,143

Full data for Bonneville County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population135,771Vintage 2025 Population Estimates
Population in 2020124,730Vintage 2025 Population Estimates
2020 estimates base?123,959Vintage 2025 Population Estimates
Land area1,866 sq mi2025 Gazetteer Files
Water area34.3 sq mi2025 Gazetteer Files
Total area1,900 sq mi2025 Gazetteer Files
Population density?72.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$79,068American Community Survey 2020-2024 5-Year Estimates
Median home value$368,800American Community Survey 2020-2024 5-Year Estimates
Median age33.6American Community Survey 2020-2024 5-Year Estimates
Households44,184American Community Survey 2020-2024 5-Year Estimates
Housing units47,489American 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
+764
1,796 births, 1,032 deaths
Net migration
+1,217
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 Bonneville 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
Bingham CountyIdaho89 mi51,153
Jefferson CountyIdaho45 mi35,297
Caribou CountyIdaho28 mi7,252
Teton CountyIdaho26 mi13,254
Lincoln CountyWyoming20 mi21,180
Teton CountyWyoming13 mi23,333
Madison CountyIdaho12 mi55,172

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

All 44 counties of Idaho

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

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