Top 10 Largest Cities in Idaho

Idaho, in the Pacific Northwest, is called the “Gem State” due to the variety of precious gems found there. Idaho has a population of about 1.9 million. Boise is both the capital and largest city, recognized for its outdoor recreation and rapidly growing tech industry.

10 Largest Cities in Idaho

1. Boise (Idaho)

City Facts

  • County: Ada County
  • Area: 85.12 square miles
  • Population: 240,713 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83701-83799
  • Latitude: 43.615018
  • Longitude: -116.202313

Location and History:

Boise, the capital and largest city of Idaho, is located in the southwestern part of the state along the Boise River. It was established in 1863 during the Idaho Gold Rush as a military outpost to protect settlers from Native American tribes. The city’s name, meaning “wooded” in French, refers to the lush cottonwood trees along the river, a welcome sight for travelers crossing the high desert. As Idaho grew, so did Boise, becoming the state capital in 1864. Today, Boise is known for its outdoor recreation, vibrant arts scene, and growing tech industry. It has become a hub for innovation and culture in the Pacific Northwest.

Major Landmarks:

  • Boise River Greenbelt: A 25-mile scenic pathway along the Boise River, perfect for biking and walking.
  • Idaho State Capitol: The iconic government building in downtown Boise, showcasing neoclassical architecture.
  • Old Idaho Penitentiary: A historic prison that offers guided tours and exhibits about Idaho’s criminal history.
  • Julia Davis Park: Home to several museums, including the Boise Art Museum, the Idaho State Museum, and the Zoo Boise.

Major Highways:

Boise is well-connected by Interstate 84, the primary east-west highway running through southern Idaho, linking it to Twin Falls and eastern Oregon. U.S. Highway 20 and U.S. Highway 26 also pass through Boise, providing connections to nearby towns. State Route 55 runs north from Boise into the Payette National Forest, a popular route for outdoor enthusiasts. These highways make Boise a crucial transportation hub in Idaho.


2. Meridian (Idaho)

City Facts

  • County: Ada County
  • Area: 33.99 square miles
  • Population: 132,169 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83642-83646
  • Latitude: 43.612109
  • Longitude: -116.391514

Location and History:

Meridian is located just west of Boise in southwestern Idaho’s Treasure Valley. Founded in 1893, it began as a small agricultural town centered on dairy farming and orchards. The city was named after the Boise Meridian, a principal survey line that runs through the area. For most of its history, Meridian remained a quiet rural community, but in the late 20th and early 21st centuries, it experienced rapid growth due to its proximity to Boise and the tech boom in the Treasure Valley. Meridian has become one of Idaho’s fastest-growing cities, known for its family-friendly environment and strong local economy.

Major Landmarks:

  • Roaring Springs Water Park: One of the largest water parks in the Northwest, offering various slides and pools.
  • Wahooz Family Fun Zone: A popular family entertainment center with go-karts, mini-golf, and laser tag.
  • Settlers Park: A community park with playgrounds, picnic areas, sports fields, and a splash pad.
  • Meridian Speedway: A historic racetrack that hosts stock car racing and other motorsports events.

Major Highways:

Meridian is served by Interstate 84, which runs east-west and connects the city to Boise, Nampa, and Twin Falls. State Highway 55 runs through the northern part of Meridian, linking the city to Eagle and the Payette River Basin. U.S. Route 20/26 also passes nearby, providing additional access to Boise and Caldwell. These highways support Meridian’s growth as a suburban center in the Treasure Valley.


3. Nampa (Idaho)

City Facts

  • County: Canyon County
  • Area: 31.61 square miles
  • Population: 108,896 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83651-83687
  • Latitude: 43.540717
  • Longitude: -116.563462

Location and History:

Nampa is located in southwestern Idaho, about 20 miles west of Boise. The city was founded in 1886 as a railroad town along the Oregon Short Line. Nampa grew rapidly as an agricultural center, benefiting from the fertile soil and irrigation projects in the region. The city’s name likely comes from a Native American word meaning “footprints,” referring to its location on a historic trail. Throughout the 20th century, Nampa continued to grow due to its agricultural industry, including sugar beets and hops. Today, Nampa is a thriving city with a mix of industry, retail, and culture, serving as a gateway to Idaho’s wine country.

Major Landmarks:

  • Nampa Train Depot Museum: A historic railroad depot that now serves as a museum dedicated to local history.
  • Lake Lowell: A popular spot for boating, fishing, and birdwatching, located within the Deer Flat National Wildlife Refuge.
  • Ford Idaho Center: A multipurpose venue hosting concerts, sporting events, rodeos, and the annual Snake River Stampede.
  • Warhawk Air Museum: A museum featuring historic aircraft and exhibits on military aviation and World War II.

Major Highways:

Nampa is connected by Interstate 84, which runs east-west, linking the city to Boise, Caldwell, and Ontario, Oregon. U.S. Route 20 and U.S. Route 26 also pass through Nampa, providing connections to neighboring towns. Idaho State Highway 45 runs south from Nampa to Melba, serving as a local agricultural route. These highways make Nampa a key transportation hub in Canyon County.


4. Idaho Falls (Idaho)

City Facts

  • County: Bonneville County
  • Area: 22.80 square miles
  • Population: 66,026 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83401-83406
  • Latitude: 43.491651
  • Longitude: -112.033964

Location and History:

Idaho Falls is located in eastern Idaho along the Snake River, near the edge of the Rocky Mountains. The city was originally established in the 1860s as a stop on the Montana Trail, with the construction of a ferry across the Snake River. It was first called Eagle Rock but was renamed Idaho Falls in 1891 after the construction of a dam and power plant on the river. The city’s economy has historically been based on agriculture, particularly potato farming, and later expanded into nuclear research with the establishment of the Idaho National Laboratory. Today, Idaho Falls is a regional economic center, serving eastern Idaho and parts of Wyoming and Montana.

Major Landmarks:

  • Idaho Falls River Walk: A scenic path along the Snake River featuring waterfalls, parks, and public art installations.
  • Museum of Idaho: A museum showcasing the region’s history, including exhibits on Native American culture, pioneers, and the nuclear age.
  • Tautphaus Park Zoo: A popular zoo featuring animals from around the world, along with playgrounds and picnic areas.
  • Melaleuca Field: A baseball stadium home to the Idaho Falls Chukars, a minor league team.

Major Highways:

Idaho Falls is located along Interstate 15, which runs north-south, connecting the city to Pocatello, Salt Lake City, and Montana. U.S. Route 20 runs east-west through the city, providing access to Yellowstone National Park to the east and the Magic Valley region to the west. State Highway 26 offers connections to nearby towns and rural areas. These highways make Idaho Falls a critical transportation center in eastern Idaho.


5. Pocatello (Idaho)

City Facts

  • County: Bannock County
  • Area: 32.49 square miles
  • Population: 56,531 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83201-83209
  • Latitude: 42.871303
  • Longitude: -112.445534

Location and History:

Pocatello is located in southeastern Idaho along the Portneuf River, near the intersection of Interstates 15 and 86. It was established as a railroad town in the late 19th century, named after Chief Pocatello of the Shoshone-Bannock tribes, who allowed the railroad to pass through tribal lands. Pocatello became a vital transportation hub for goods moving between Utah and Montana. The city grew quickly due to its role in the Union Pacific Railroad, and later, its development as an industrial and educational center. Today, Pocatello is home to Idaho State University and has a diverse economy that includes education, manufacturing, and healthcare.

Major Landmarks:

  • Idaho Museum of Natural History: Located on the Idaho State University campus, this museum features exhibits on Idaho’s geology, paleontology, and native cultures.
  • Fort Hall Replica: A replica of the historic 19th-century trading post that was a key stop on the Oregon Trail.
  • Zoo Idaho: A zoo that focuses on animals native to the Intermountain West, offering educational programs and exhibits.
  • Holt Arena: A multipurpose indoor stadium on the Idaho State University campus, hosting sporting events, concerts, and trade shows.

Major Highways:

Pocatello is served by Interstate 15, which runs north-south, linking the city to Idaho Falls and Salt Lake City. Interstate 86 provides an east-west connection between Pocatello and Twin Falls. U.S. Route 30 runs through the city, offering local access to nearby towns and rural areas. State Highway 39 provides a route to the Fort Hall Indian Reservation and American Falls. These highways make Pocatello an important transportation and distribution center in southeastern Idaho.


6. Caldwell (Idaho)

City Facts

  • County: Canyon County
  • Area: 22.12 square miles
  • Population: 58,481 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83605-83607
  • Latitude: 43.662938
  • Longitude: -116.687359

Location and History:

Caldwell is located in southwestern Idaho in the heart of the Treasure Valley, about 25 miles west of Boise. Founded in 1883, it developed as a railroad town along the Oregon Short Line, which helped stimulate growth in the region. Caldwell was an agricultural center, with crops such as sugar beets, hops, and onions being major contributors to its economy. The city is also known for being home to the College of Idaho, the state’s oldest private college, established in 1891. In recent years, Caldwell has experienced significant population growth and has become a hub for wine production in Idaho.

Major Landmarks:

  • Indian Creek Plaza: A central gathering place featuring concerts, farmers markets, and an ice-skating rink in winter.
  • College of Idaho: A private liberal arts college with a beautiful campus and rich history.
  • Canyon County Fairgrounds: Hosting the annual county fair, rodeos, and other community events.
  • Our Memories Indian Creek Museum: A local museum preserving the history of Caldwell and Canyon County.

Major Highways:

Caldwell is located along Interstate 84, which runs east-west and connects the city to Boise, Nampa, and Ontario, Oregon. U.S. Route 20/26 passes through Caldwell, providing additional regional access. State Route 19 offers a connection to the nearby Snake River Valley and wine-growing areas. These highways are vital for the city’s agricultural and commercial activity in the Treasure Valley.


7. Coeur d’Alene (Idaho)

City Facts

  • County: Kootenai County
  • Area: 16.17 square miles
  • Population: 56,738 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83814-83816
  • Latitude: 47.677683
  • Longitude: -116.780466

Location and History:

Coeur d’Alene is located in northern Idaho, along the shores of Lake Coeur d’Alene and near the Spokane River. The city was named after the Coeur d’Alene Native American tribe, and its name means “heart of an awl” in French, referring to the tribe’s sharp trading practices. The city was established in the late 1800s as a mining and logging center and later developed into a popular tourist destination due to its beautiful lake and surrounding forests. Today, Coeur d’Alene is a thriving city with a strong tourism industry, drawing visitors for boating, hiking, and skiing.

Major Landmarks:

  • Lake Coeur d’Alene: A large natural lake offering boating, fishing, and scenic cruises.
  • Tubbs Hill: A popular hiking area with trails offering views of the lake and downtown Coeur d’Alene.
  • Coeur d’Alene Resort: A luxury resort known for its world-famous floating golf green.
  • Silverwood Theme Park: A large amusement park located just outside the city, featuring rides, a water park, and live entertainment.

Major Highways:

Coeur d’Alene is served by Interstate 90, which runs east-west through the city, connecting it to Spokane, Washington, and Missoula, Montana. U.S. Route 95 runs north-south, providing access to Sandpoint and other towns in northern Idaho. State Highway 41 offers additional regional connections. These highways make Coeur d’Alene a key transportation and tourism hub in northern Idaho.


8. Twin Falls (Idaho)

City Facts

  • County: Twin Falls County
  • Area: 18.16 square miles
  • Population: 53,213 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83301-83303
  • Latitude: 42.562966
  • Longitude: -114.460871

Location and History:

Twin Falls is located in south-central Idaho along the Snake River Canyon. The city was founded in 1904 as part of an irrigation project that brought water to the arid region, transforming it into a productive agricultural area. The city is named after the nearby Twin Falls, one of several waterfalls along the Snake River. Twin Falls became a regional agricultural center, particularly known for dairy farming and potato production. In recent years, the city has grown as a center for food processing, manufacturing, and outdoor recreation, serving as a gateway to southern Idaho’s natural attractions.

Major Landmarks:

  • Shoshone Falls: Often called the “Niagara of the West,” this stunning waterfall is higher than Niagara Falls and a popular tourist destination.
  • Perrine Bridge: An iconic bridge spanning the Snake River Canyon, popular for BASE jumping.
  • Canyon Springs Golf Course: A scenic golf course located within the Snake River Canyon.
  • Twin Falls Visitor Center: Offering panoramic views of the canyon and information about local attractions.

Major Highways:

Twin Falls is connected by U.S. Route 93, which runs north-south, linking the city to Nevada and the Salmon-Challis National Forest. Interstate 84 is located just north of the city, providing an east-west route across southern Idaho. State Highway 30 runs through Twin Falls, connecting the city to neighboring towns and agricultural areas. These highways make Twin Falls a key agricultural and transportation center in southern Idaho.


9. Post Falls (Idaho)

City Facts

  • County: Kootenai County
  • Area: 14.37 square miles
  • Population: 41,319 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83854
  • Latitude: 47.717935
  • Longitude: -116.951585

Location and History:

Post Falls is located in northern Idaho along the Spokane River, just west of Coeur d’Alene. The city was founded in 1871 by Frederick Post, who established a sawmill along the river. Post Falls grew as a logging town, benefiting from the abundant timber resources of northern Idaho. Over time, the city diversified its economy and has become a suburban community with close ties to both Coeur d’Alene and Spokane, Washington. Post Falls is known for its outdoor recreation opportunities, with easy access to lakes, rivers, and forests.

Major Landmarks:

  • Q’emiln Park: A park along the Spokane River offering hiking trails, rock climbing, and a beach area.
  • Falls Park: A scenic park located near the historic dam that powered Frederick Post’s sawmill.
  • The Highlands Golf Course: A popular 18-hole golf course set in the rolling hills of northern Idaho.
  • Post Falls Historical Society Museum: A museum preserving the history of the city’s logging and industrial past.

Major Highways:

Post Falls is served by Interstate 90, which runs east-west through the city, connecting it to Coeur d’Alene and Spokane, Washington. U.S. Route 95 is located nearby, providing north-south access to northern Idaho and Canada. State Highway 41 runs north from Post Falls, offering connections to nearby rural areas. These highways support Post Falls’ role as a growing suburban community in the Inland Northwest.


10. Lewiston (Idaho)

City Facts

  • County: Nez Perce County
  • Area: 18.04 square miles
  • Population: 34,781 (2023 estimate)
  • Area Codes: 208, 986
  • Zip Codes: 83501
  • Latitude: 46.416548
  • Longitude: -117.017658

Location and History:

Lewiston is located in north-central Idaho, at the confluence of the Snake and Clearwater Rivers. The city was founded in 1861 during the Idaho Gold Rush and was briefly the capital of the Idaho Territory before the capital moved to Boise. Named after explorer Meriwether Lewis of the Lewis and Clark Expedition, Lewiston grew as a transportation and supply center for miners heading into the surrounding mountains. The city remains a key shipping hub, as it is the furthest inland seaport on the West Coast, with access to the Pacific Ocean via the Snake and Columbia Rivers. Lewiston’s economy is driven by agriculture, manufacturing, and paper production.

Major Landmarks:

  • Hells Gate State Park: A popular park offering camping, hiking, and boat access to Hells Canyon, the deepest river gorge in North America.
  • Nez Perce National Historical Park: A park that preserves sites important to the history of the Nez Perce tribe.
  • Lewis-Clark State College: A public college with a beautiful campus and a focus on education and training for the region.
  • Clearwater River Casino: A casino and resort operated by the Nez Perce Tribe, offering gaming, dining, and entertainment.

Major Highways:

Lewiston is connected by U.S. Route 12, which runs east-west, linking the city to Missoula, Montana, and the Lolo Pass. U.S. Route 95 runs north-south, providing access to Coeur d’Alene and southern Idaho. State Highway 128 connects Lewiston to Clarkston, Washington, just across the Snake River. These highways are essential for Lewiston’s role as a transportation and agricultural hub in north-central Idaho.