Cities in Ada County, Idaho by Population (2024)

There are 12 cities in Ada County, Idaho.

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

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City
Rank
State
2024 Population
2020 Census
Annual Change
Density (mi²)
Area (mi²)
Boise1Idaho237,250236,0180.13%2,80684.55
Meridian2Idaho140,067119,4053.83%3,80036.86
Nampa3Idaho120,599101,3034.17%3,46834.77
Caldwell4Idaho71,19560,6453.85%3,02823.52
Eagle5Idaho33,96030,8382.35%1,04632.46
Kuna6Idaho29,98924,4694.82%1,16825.68
Star7Idaho17,89111,4019.98%1,8409.72
Garden City8Idaho13,55812,2962.39%3,3224.08
Hidden Springs9Idaho3,7523,4162.29%1,4242.63
Avimor10Idaho1,4171,2113.81%1,0401.36
Robie Creek11Idaho1,0941,380-6.09%3630.09
Melba12Idaho5755730.17%1,2580.46

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Ada County, Idaho?

Boise City is the largest city in Ada County.

What is the smallest city in Ada County, Idaho?

Melba is the smallest city in Ada County.

How many cities are in Ada County?

There are 12 cities in Ada County, Idaho.

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