cities in Idaho

Idaho is a U.S. state located in the northwestern part of the country and well known for its mountainous landscapes and vast swaths of protected wilderness and outdoor recreation areas.

As of 2020, Idaho’s population was estimated to be 1,839,106 making it one of the least populous states in the U.S.

There are 201 incorporated municipalities legally known as cities in Idaho and in this post we’ll be looking at the most populous cities in Idaho.

Table of Contents

List of the Largest Cities in Idaho

City nameCountyPopulation (2020 Estimate)
BoiseAda County240,380
MeridianAda County129,555
NampaCanyon County105,405
Idaho FallsBonneville County64,618
CaldwellCanyon County62,487
PocatelloBannock County57,947
Coeur d’AleneKootenai County54,822
Twin FallsTwin Falls51,165
Post FallsKootenai County39,452
LewistonNez Perce County32,978

10 Most Populous Cities in Idaho

1. Boise  

cities in Idaho

The most populous city and capital of the U.S. state of Idaho is Boise. Boise is also the county seat of Ada County. In 2020 its population was estimated to be 240,380.

The city was founded in 1863 and incorporated in 1864. The Boise Metropolitan Area is also known as the Treasure Valley and it is the most populous metropolitan area in Idaho that includes five counties with a combined population of 749,202.

Downtown Boise has many local restaurants, bars, and boutiques and its main attractions are the Idaho State Capitol, the Boise Art Museum, the Egyptian Theatre, and Zoo Boise.  

2. Meridian  

cities in Idaho

Meridian was founded in 1893 and incorporated in 1903. It is located in Ada County in Idaho, USA. As of 2020, its population was 129,555, making it the second-largest city in Idaho after Boise.

It is considered to Idaho’s fastest-growing city as well as one of the fastest-growing cities in the United States.

3. Nampa  

cities in Idaho

Nampa is the third most populous city in Idaho with an estimated population of 105,405 (as of 2020).  It is also the largest city of Canyon County, Idaho, and the second main city of the Boise-Nampa Metropolitan Area.

It is located approximately 20 miles west of Boise along Interstate 84, and 6 miles west of meridian.

The name “Nampa” comes from a Shoshoni word which either means moccasin or footprint. It was established in 1886 and incorporated in 1891.

4. Idaho Falls  

cities in Idaho

Idaho Falls is the fourth most populous city in Idaho with an estimated population of 64,618. It is located in Bonneville County which is also the county seat.

Idaho Falls is the largest city outside the Boise Metropolitan Area. The city serves as the commercial, cultural, and healthcare hub for Eastern Idaho and some parts of western Wyoming and southern Montana.

Idaho Falls is home to the College of Eastern Idaho, the Museum of Idaho, and the Idaho Falls Chukars minor league baseball team.

Idaho Falls is the main city of the Idaho Falls Metropolitan Statistical Area as well as the main city of the Idaho Falls – Blackfoot, Idaho Combined Statistical Area.

5. Caldwell  

cities in Idaho

Caldwell is a city in Idaho founded in 1883. It is in and the county seat of Canyon County. Its population was estimated in 2020 to be 62,487, making it the fifth most populous city in Idaho.

The College of Idaho and College of Western Idaho is located in Caldwell.

6. Pocatello  

Cities in Idaho

Pocatello is a city in Idaho established in 1889 and located in both Bannock and Power Counties, Idaho.  It is the county seat and largest city of Bannock County as well as the principal city of the Pocatello Metropolitan Area.

It is the sixth most populous city in Idaho with an estimated population of 57,947 (as of 2020). Pocatello is on Forbes’ list of the Best Small Places for Business and Careers in the United States.

7. Coeur d’Alene  

cities in Idaho

Coeur d’Alene is the county seat of Kootenai County, Idaho, and the largest city in North Idaho. It is the main city of the Coeur d’Alene Metropolitan Statistical Area.

It was founded in 1878 and was incorporated as a town in 1887 and as a city in 1904.

As of 2020, its estimated population was 54,822 making it the 7th most populous city in Idaho. It is the satellite city of Spokane. 

8. Twin Falls

Cities in Idaho

This is the largest city and the county seat of Twin Falls County, Idaho. The city had a population of 51,165 (as of 2020), making it the eighth-most populous city in Idaho.

Twin Falls is the principal city of the Twin falls Metropolitan Statistical Area which includes the whole of Twin Falls and Jerome Counties.

9. Post Falls  

cities in Idaho

With a 2020 population of 39,452, Post Falls is the ninth most populous city in the U.S. state of Idaho. It is located in Kootenai County, between Coeur d’Alene and Spokane, Washington, USA.

Post Falls is a suburb of Coeur d’Alene to the east and to the west, a bedroom community to Spokane.

10. Lewiston   

cities in Idaho

This is the county seat of Nez Perce County, Idaho. Lewiston City was founded in 1861 and named for Meriwether Lewis (an American explorer, soldier, Politian, and public administrator). It is located in the north-central region of Idaho and the second-largest city in that region.

As of 2020, it had a population of 32,978, making it the tenth most populated city in Idaho. It is the principal city of the Lewiston, ID-WA Metropolitan Statistical Area which includes the entirety of Nez Perce County and Asotin County, Washington.  


Out of 201 cities in Idaho, the top 10 most populated cities are Boise (which is the capital of Idaho), Meridian, Nampa, Idaho Falls, Caldwell, Pocatello, Coeur d’Alene, Twin Falls, Post Falls, and Lewiston.

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