Ada County is a county located in the U.S. state of Idaho. As of the most recent data available, the county has a population of approximately 300,904 people, with a population density of about 285.22 persons per square mile.
The county spans a total land area of 1,055.00 square miles (2,732.00 square kilometers). The administrative center and county seat is Boise, which often serves as a hub for local governance and services. The largest city within the county by population is Boise.
Geographically, Ada County experiences varied elevations, with its highest point at Orchard 3,150 ft and its lowest point at Eagle 0 ft. The region operates in the UTC-7.