Data / Population density / Ada County

Population density in Ada County

Population density in Ada County was 200.4 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 2% from 2024. That is the 1st highest of 44 counties in 2025.

2025, inhabitants per km²200.4
Change on 2024+2%
Rank1st of 44Counties in Idaho ranked
Series high200.42025
Series low182.82020

Population density in Ada County, 2020 to 2025

CSVChart (SVG)

1801851901952002052020202120222023202420252020: 182.8 inhabitants per km²2021: 188.3 inhabitants per km²2022: 190.9 inhabitants per km²2023: 193.1 inhabitants per km²2024: 196.4 inhabitants per km²2025: 200.4 inhabitants per km²
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09, published 2026-03-26.
All 6 values
Periodinhabitants per km²
2025200.4
2024196.4
2023193.1
2022190.9
2021188.3
2020182.8

Compared with Idaho and United States

Place2025
Ada County200.4
Idaho9.5
United States37.3

Rankings

Definition

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

How to cite

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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Questions

What is the population density in Ada County?

Population density in Ada County was 200.4 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 2% from 2024. That is the 1st highest of 44 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved by Invokely on 2026-10-09.

What was the highest population density in Ada County?

200.4 inhabitants per km² in 2025, the highest value since 2020 in this series.

More statistics for Ada County

All statistics for Ada County