County Maps US

Nez Perce County, Idaho

A county in Idaho, ranked 10 of 44 by population.

CountyFIPS 16069

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

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Population
42,905
+757 (+1.8%) since 2020
Land area
848.3
square miles. A further 1.0% of the total area is water
Population density
50.6
people per square mile, computed rather than published
County seat
Lewiston
Seat of county government.
Established
1864
161 years ago
Largest city
Lewiston city
Population 34,717.

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 Nez Perce 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 Nez Perce 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 533 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 Nez Perce 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
Population42,90510th of 441,138th of 3,144
Land area848.3 sq mi33rd of 44984th of 3,144
Population density50.6 per sq mi9th of 441,460th of 3,144
Median household income$72,59914th of 441,006th of 3,143

Full data for Nez Perce County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population42,905Vintage 2025 Population Estimates
Population in 202042,148Vintage 2025 Population Estimates
2020 estimates base?42,089Vintage 2025 Population Estimates
Land area848.3 sq mi2025 Gazetteer Files
Water area8.2 sq mi2025 Gazetteer Files
Total area856.5 sq mi2025 Gazetteer Files
Population density?50.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$72,599American Community Survey 2020-2024 5-Year Estimates
Median home value$334,700American Community Survey 2020-2024 5-Year Estimates
Median age41.2American Community Survey 2020-2024 5-Year Estimates
Households17,270American Community Survey 2020-2024 5-Year Estimates
Housing units18,578American 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
-153
483 births, 636 deaths
Net migration
+161
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 Nez Perce 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
Lewis CountyIdaho56 mi3,704
Asotin CountyWashington37 mi22,545
Latah CountyIdaho32 mi41,842
Clearwater CountyIdaho17 mi9,118
Idaho CountyIdaho13 mi17,874
Wallowa CountyOregon12 mi7,595
Whitman CountyWashington8.0 mi48,512

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.