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Information and Statistics

The Community Planning Division utilizes data available from COMPASS, the Ada County Assessor, the U.S. Census Bureau and other entities to determine current and future population estimates, housing and construction trends and economic conditions for Ada County. This information aids the County in long-term planning decisions and helps to determine future capital and facility needs.

Frequently Asked Questions

How many people currently live in Ada County, and how many are projected to live here by 2040?

According to COMPASS estimates, Ada County’s population is 502,970 as of 2020, and projected to increase to 689,726 by 2040.

How fast has Ada County grown since 2000?

Ada County’s population was 300,904 in 2000 according to the U.S. Census Bureau. COMPASS estimates Ada County’s 2020 population to be 502,970, an increase of 202,066 (67.2%) since 2000.

How many people live in unincorporated Ada County?

According to COMPASS estimates, there are 61,470 people living in unincorporated areas of the County as of 2020, accounting for 12.2% of the County’s total population.

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