Boise is the capital and most populous city in the U.S. state of Idaho and is the county seat of Ada County. As of the 2020 census, there were 235,684 people residing in the city. On the Boise River in southwestern Idaho, it is 41 miles (66 km) east of the Oregon border and 110 miles (177 km) north of the Nevada border. The downtown area's elevation is 2,704 feet (824 m) above sea level.
Owyhee County is a county in the southwestern corner of the U.S. state of Idaho. As of the 2020 census, the population was 11,913. The county seat is Murphy, and its largest city is Homedale. In area it is the second-largest county in Idaho, behind Idaho County.
Gem County is a county in the U.S. state of Idaho. As of the 2020 census, the population was 19,123. The county seat and largest city is Emmett.
Elmore County is a county in the U.S. state of Idaho. As of the 2020 census, the population was 28,666. The largest city and county seat is Mountain Home.
Cassia County is a county in the U.S. state of Idaho. As of the 2020 Census the county had a population of 24,655. The county seat and largest city is Burley. Cassia County is included in the Burley, ID Micropolitan Statistical Area.
Canyon County is located in the U.S. state of Idaho. As of the 2020 Census, the population was 231,105, which by 2022 was estimated to have risen to 251,065. making it the second-most populous county in Idaho. The county seat is Caldwell, and its largest city is Nampa. Canyon County is part of the Boise metropolitan area.
Boise County is a rural mountain county in the U.S. state of Idaho. As of the 2020 United States Census, the population was 7,610. The county seat is historic Idaho City, which is connected through a series of paved and unpaved roads to Lowman, Centerville, Placerville, Pioneerville, Star Ranch, Crouch, Garden Valley, and Horseshoe Bend.
Ada County is located in the southwestern part of Idaho, United States. As of the 2020 census, the county had a population of 494,967, which by 2022 was estimated to have risen to 518,907. Ada County is by far the state's most populous county; it is home to 26.8% of the state's population. The county seat and largest city is Boise, which is also the state capital. Ada County is included in the Boise metropolitan area. The Ada County Highway District has jurisdiction over all the local county and city streets, except for private roads and state roads. In the interior Pacific Northwest east of the Cascade Range, Ada County ranks second in population, behind Spokane County, Washington.
Eagle is a city in Ada County, Idaho 10 miles (16 km) northwest of Boise. The population was 30,346 at the 2020 census.
Garden City is a city in Ada County, Idaho. The population was 12,316 at the time of the 2020 census. Garden City is nearly surrounded by Boise but retains a separate municipal government.
Pocatello is the county seat and largest city of Bannock County, with a small portion on the Fort Hall Indian Reservation in neighboring Power County, containing the city's airport. It is the principal city of the Pocatello metropolitan area, which encompasses all of Bannock County in the southeastern part of the U.S. state of Idaho.
Hailey is a city in and the county seat of Blaine County, in the Wood River Valley of the central part of the U.S. state of Idaho. The population was 7,960 at the 2010 census, up from 6,200 in 2000. Hailey is the site of Friedman Memorial Airport (SUN), the airport for the resort area of Sun Valley/Ketchum, 12 miles (19 km) north. The town of Bellevue is a few miles south. From 1882 to 1895, Hailey was the county seat of now-defunct Alturas County.
Caldwell is a city in and the county seat of Canyon County, Idaho. The population was 59,996 at the time of the 2020 United States census, making it the 5th most populous city in Idaho.
Nampa is the most populous city in Canyon County, Idaho, United States. The population was 100,200 at the 2020 census. It is Idaho's 3rd most populous city. Nampa is about 20 miles (32 km) west of Boise along Interstate 84, and 6 miles (9.7 km) west of Meridian. It is the second principal city of the Boise metropolitan area. The name "Nampa" may have come from a Shoshoni word meaning either 'moccasin' or 'footprint'. According to toponymist William O. Bright the name comes from the Shoshoni word /nampai/, meaning "foot".
Adelphi is an unincorporated area and census-designated place in Prince George's County, Maryland, United States. Per the 2020 Census, the population was 16,823. Adelphi includes the following subdivisions; Adelphi, Adelphi Park, Adelphi Hills, Adelphi Terrace, Adelphi Village, Buck Lodge, Chatham, Cool Spring Terrace, Hillandale Forest, Holly Hill Manor, Knollwood, Lewisdale, and White Oak Manor.
The Boise, Idaho Metropolitan Statistical Area (MSA) is an area that encompasses Ada, Boise, Canyon, Gem, and Owyhee counties in southwestern Idaho, anchored by the cities of Boise and Nampa. It is the main component of the wider Boise–Mountain Home–Ontario, ID–OR Combined Statistical Area, which adds Elmore and Payette counties in Idaho and Malheur County, Oregon. It is the state's largest officially designated metropolitan area and includes Idaho's three largest cities: Boise, Nampa, and Meridian. Nearly 40 percent of Idaho's total population lives in the area.
The West Ada School District #2, long known as the Meridian School District, is a school district based in Meridian, Idaho. In addition to Meridian, the district operates public schools in Eagle, Star and western Boise. It is the largest school district in Idaho.
The Boise School District #1 is one of 115 public school districts in Idaho, United States. The Boise School District serves a 456 square mile area of Ada County and is headquartered in Boise, Idaho. The district was founded in 1865 under the auspices of Idaho Territory. Formerly the largest school district in the state, it now ranks second to the adjacent West Ada School District #2, which administers several schools in western Boise. Peak enrollment in the Boise School District was reached in 1997 at 27,070.
Westphalia is a census-designated place in southern Prince George's County, Maryland, United States. The population of the CDP was 11,770 at the 2020 census.
Annex is an unincorporated community and census-designated place in Malheur County, Oregon, United States. Its population was 235 as of the 2010 census. The community is located on the south bank of the Snake River across from Weiser, Idaho; a bridge carrying U.S. Route 95 Spur connects the two.
