County Maps US

Twin Falls County, Idaho

A county in Idaho, ranked 5 of 44 by population.

CountyFIPS 16083

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

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Population
97,539
+7,174 (+7.9%) since 2020
Land area
1,922
square miles. A further 0.4% of the total area is water
Population density
50.8
people per square mile, computed rather than published
County seat
Twin Falls
Seat of county government.
Established
1907
118 years ago
Largest city
Twin Falls city
Population 56,216.

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 Twin Falls 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 Twin Falls 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 678 by 800 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 Twin Falls 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
Population97,5395th of 44641st of 3,144
Land area1,922 sq mi13th of 44297th of 3,144
Population density50.8 per sq mi8th of 441,450th of 3,144
Median household income$67,40923rd of 441,393rd of 3,143

Full data for Twin Falls County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population97,539Vintage 2025 Population Estimates
Population in 202090,365Vintage 2025 Population Estimates
2020 estimates base?90,050Vintage 2025 Population Estimates
Land area1,922 sq mi2025 Gazetteer Files
Water area7.0 sq mi2025 Gazetteer Files
Total area1,929 sq mi2025 Gazetteer Files
Population density?50.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$67,409American Community Survey 2020-2024 5-Year Estimates
Median home value$337,900American Community Survey 2020-2024 5-Year Estimates
Median age36.1American Community Survey 2020-2024 5-Year Estimates
Households34,754American Community Survey 2020-2024 5-Year Estimates
Housing units36,429American 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
+252
1,199 births, 947 deaths
Net migration
+816
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 Twin Falls 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
Owyhee CountyIdaho53 mi12,661
Cassia CountyIdaho51 mi26,397
Gooding CountyIdaho41 mi16,446
Elko CountyNevada39 mi54,815
Jerome CountyIdaho38 mi26,362
Elmore CountyIdaho9.9 mi29,465

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.