Ada County on the map of Idaho 2024. Cities, roads, borders and directions in Ada County of Idaho.

Ada County is located in the southern part of Idaho. This exciting county is named after Ada Riggs, daughter of H. C. Riggs, a member of the Idaho Territorial Legislature. The county seat of Ada County is Boise. The county's area is about 1055 square miles. Established in 1864, today Ada County is home to 512 thousand residents. This map shows the borders of Ada County as well as neighboring counties, including major highways and natural objecsts as of 2024. Zoom in or out of the map using the plus/minus panel. Move the center of this map by dragging it. Also check out the satellite map of Ada County.