Cities & Towns in Boulder County, CO

Boulder County, county in Colorado, United States. As of 2020 county had an estimated population of 327,171 inhabitants. The county was created 162 years ago in 1861. Its county seat is Boulder.

There are 12 city/town in Boulder County, CO. The largest city of Boulder County is Boulder with a population of 107,645. Other cities include, Longmont population 98,445, Erie population 30,318, Lafayette population 28,579, Louisville population 19,060

Boulder
Boulder

Boulder, The most populous city in Boulder County, Colorado.

Longmont
Longmont

Longmont, The most populous city in Boulder County, Colorado.

Erie
Erie

Erie, Town in Boulder County, Colorado, USA

Nestled against the backdrop of the Rocky Mountains, Boulder County is home to some of Colorado's most iconic and vibrant cities. From the college town feel of Boulder to the artistic community of Longmont, each city has its own unique personality and charm.

Boulder, the lively county seat, is synonymous with outdoor adventure and progressive politics. It's home to the main campus of the University of Colorado and bursting with cafes, breweries, and eclectic shops. The iconic Flatirons loom over the city, providing plenty of rock climbing and hiking opportunities right on Boulder's doorstep.

Just down the road, Longmont has transformed in recent years from a sleepy agricultural town to a budding cultural hub. Downtown Longmont boasts a thriving arts district lined with galleries, studios, and an art-house movie theater. And the city's craft beer scene is booming, with Left Hand Brewing Company leading the charge.

The smaller towns of Lafayette, Louisville, and Erie exude that genuine small-town feel while still offering a taste of urban amenities. Louisville's historic downtown district brims with boutiques and restaurants. Lafayette prides itself on its strong community and gives back through events like the Peach Festival. And Erie, once a rural outpost, now balances sprawling new development with preserving its agricultural roots.

With endless foothills trails, farm-fresh dining, and that unmistakable Colorado sunshine, Boulder County cities have something to delight both residents and visitors alike. The unique personality woven into each community shapes the varied tapestry of life in this dynamic Front Range region.

All Boulder County Cities (Aphebetical)

List of cities, towns, neighborhoods & other populated places in Boulder County.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z all
City Name Title Population
Boulder The most populous city in Boulder County, Colorado. 107,645
Coal Creek Town in Fremont County, Colorado, United States 350
Erie Town in Boulder County, Colorado, USA 30,318
Jamestown Town in Colorado, USA 254
Lafayette City in Colorado 28,579
Longmont The most populous city in Boulder County, Colorado. 98,445
Louisville City in Colorado 19,060
Lyons Town in Boulder County, Colorado, United States 2,058
Nederland Town in Colorado, United States 1,557
Niwot Census designated place 4,006
Superior Statutory Town in Boulder and Jefferson counties in the U. 13,413
Ward Town in Colorado, United States 168
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County Cities on Map (12)

Colorado Counties (64)

Denver County (735,538) El Paso County (728,310) Arapahoe County (657,452) Jefferson County (583,283) Adams County (519,883) Douglas County (360,750) Larimer County (360,428) Weld County (333,983) Boulder County (327,171) Pueblo County (169,823) Mesa County (155,603) Broomfield County (72,236) Garfield County (60,366) La Plata County (56,564) Eagle County (54,929) Fremont County (47,867) Montrose County (43,322) Delta County (31,067) Summit County (30,631) Morgan County (28,941) Elbert County (27,313) Montezuma County (26,408) Routt County (25,560) Teller County (25,529) Logan County (21,974) Chaffee County (20,661) Park County (18,955) Otero County (18,201) Pitkin County (17,894) Gunnison County (17,593) Alamosa County (16,180) Grand County (15,794) Las Animas County (14,420) Archuleta County (14,196) Moffat County (13,144) Prowers County (12,106) Rio Grande County (11,296) Yuma County (10,047) Clear Creek County (9,586) Conejos County (8,143) San Miguel County (8,105) Lake County (7,987) Kit Carson County (7,121) Saguache County (6,938) Huerfano County (6,883) Rio Blanco County (6,342) Gilpin County (6,235) Crowley County (5,696) Lincoln County (5,680) Bent County (5,356) Custer County (5,183) Ouray County (5,001) Washington County (4,875) Phillips County (4,367) Costilla County (3,921) Baca County (3,555) Sedgwick County (2,260) Dolores County (2,096) Cheyenne County (1,795) Kiowa County (1,458) Jackson County (1,389) Hinsdale County (808) Mineral County (773) San Juan County (748)