Idaho population density

Organization

U.S. Census Bureau

Dataset

Population density (computed by Understand Idaho)

Geography

Nation, all 50 states and the District of Columbia, Idaho's 44 counties, and every Idaho incorporated place of 5,000 or more residents

Time coverage

2010-2025

Update frequency

Annual

Published

May 14, 2026

Newest release as of

September 9, 2026; next expected by June 2027

Original file

https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/totals/co-est2025-alldata.csv

License

Public domain. U.S. federal government work.

Our copy

Population density (computed by Understand Idaho)

Caveats

• Computed by Understand Idaho from Population Estimates Program and Gazetteer Files, 2025 and 2026 (counties and states); it is not a figure the publisher releases.
• Totals for 2010-2019 are Vintage 2019 estimates and 2020-2025 are Vintage 2025; a change across 2019 to 2020 includes the revision between vintages.
• Area follows the legal boundary vintage in effect January 1, 2026, and can change from one vintage to the next when a boundary is corrected, even where nothing changed on the ground.
• The Census Bureau measures land and water area in square meters, then converts to the square-mile figures this dataset stores, as the Bureau prints them, to three decimals.
• The 2026 state and national file carries no United States total row, so no nation-level observation is stored; Puerto Rico is excluded because Understand Idaho does not track it as a geography.
• Each vintage is kept under its own year rather than replaced, so a derived figure whose other input lags (population density from the Population Estimates) still has a year both inputs share.

Where sources disagree

• Population, Idaho, 2020: U.S. Census Bureau, 2020 Census apportionment counts publishes 1,839,106. The Population Estimates base for April 1, 2020 is 1,839,123, 17 more than the 1,839,106 apportionment count. The 2020 to 2025 estimates build forward from that base.