Cities and Towns in Boulder County, Colorado
Founded on 1861-11-01, Boulder County is one of 64 counties in the state of Colorado. The city of Boulder is the county seat. With FIPS code of 13, Boulder County has a population of 329,543 and area of 740.48 square miles (1,918 km²).
List of all cities in Boulder County, CO alphabetically
| City/Town | Postal Code | Area Code |
| Allenspark, CO | 80510 | 303/720 |
| Boulder, CO | 80301 | 303/720 |
| 80302 | 303/720 | |
| 80303 | 303/720 | |
| 80304 | 303/720 | |
| 80305 | 303/720 | |
| 80306 | 303/720 | |
| 80307 | 303/720 | |
| 80308 | 303/720 | |
| 80309 | 303/720 | |
| 80310 | 303/720 | |
| 80314 | 303/720 | |
| 80321 | 303/720 | |
| 80322 | 303/720 | |
| 80323 | 303/720 | |
| 80328 | 303/720 | |
| 80329 | 303/720 | |
| Eldorado Springs, CO | 80025 | 303/720 |
| Erie, CO | 80516 | 303/720 |
| Frederick, CO | 80516 | 303/720 |
| Hygiene, CO | 80533 | 303/720 |
| I B M, CO | 80314 | 303/720 |
| Jamestown, CO | 80455 | 303/720 |
| Lafayette, CO | 80026 | 303/720 |
| Longmont, CO | 80501 | 303/720 |
| 80502 | 303/720 | |
| 80503 | 303/720 | |
| Louisville, CO | 80027 | 303/720 |
| 80028 | 303/720 | |
| Lyons, CO | 80540 | 303/720 |
| Nederland, CO | 80466 | 303/720 |
| Neodata, CO | 80322 | 303/720 |
| 80323 | 303/720 | |
| 80329 | 303/720 | |
| Neodata Business Reply, CO | 80321 | 303/720 |
| 80328 | 303/720 | |
| Niwot, CO | 80503 | 303/720 |
| 80544 | 303/720 | |
| Pinecliffe, CO | 80471 | 303/720 |
| Residence Halls University of Co, CO | 80310 | 303/720 |
| Storage Technology Corp, CO | 80028 | 303/720 |
| Superior, CO | 80027 | 303/720 |
| University of Colorado, CO | 80309 | 303/720 |
| Ward, CO | 80481 | 303/720 |
Major Cities and Towns in Boulder County, Colorado
Boulder
Area, Population, Zip Codes, and Coordinates
- Area: 27.0 square miles
- Population: Approximately 105,000 (2023 estimate)
- Zip Codes: 80301-80310, 80314
- Latitude and Longitude: 40.0150° N, 105.2705° W
Location and History
Boulder, the county seat and largest city in Boulder County, is nestled at the foothills of the Rocky Mountains, about 25 miles northwest of Denver. The city was founded in 1859 by gold prospectors and quickly became a key center for mining and settlement in the region. Boulder’s growth was further spurred by the establishment of the University of Colorado in 1876, which remains a central part of the city’s identity. Over the years, Boulder has evolved into a vibrant, progressive community known for its environmental initiatives, high quality of life, and thriving tech industry. The city’s scenic location at the base of the Flatirons, coupled with its rich cultural and intellectual life, has made Boulder a sought-after destination for residents and visitors alike.
Major Schools and Landmarks
Boulder is home to the University of Colorado Boulder, a major public research university that plays a pivotal role in the city’s culture and economy. The Boulder Valley School District serves the area, with notable schools such as Boulder High School and Fairview High School. Key landmarks include the Pearl Street Mall, a pedestrian-friendly shopping and dining district, and the Flatirons, iconic rock formations that offer hiking and climbing opportunities. The Boulder Creek Path provides a scenic route for walking, running, and biking through the city. Other notable sites include the Colorado Chautauqua, a National Historic Landmark that hosts cultural events and offers access to mountain trails, and the Fiske Planetarium, part of the University of Colorado. Boulder’s blend of natural beauty, academic excellence, and cultural vibrancy makes it one of Colorado’s most dynamic cities.
Longmont
Area, Population, Zip Codes, and Coordinates
- Area: 30.2 square miles
- Population: Approximately 100,000 (2023 estimate)
- Zip Codes: 80501-80504
- Latitude and Longitude: 40.1672° N, 105.1019° W
Location and History
Longmont is located in the northeastern part of Boulder County, about 16 miles northeast of Boulder and 33 miles north of Denver. The town was founded in 1871 by a group of Chicago investors who were drawn to the area’s agricultural potential and scenic beauty. Originally named “Chicago-Colorado Colony,” the town was later renamed Longmont after Longs Peak, a prominent mountain visible from the city. Longmont quickly developed as an agricultural hub, with sugar beets, potatoes, and other crops driving its early economy. Over the years, Longmont has grown into a diverse city with a strong mix of agriculture, industry, and technology, while maintaining its small-town charm and strong community spirit.
Major Schools and Landmarks
Longmont is served by the St. Vrain Valley School District, with notable schools such as Longmont High School and Silver Creek High School. Major landmarks include the Longmont Museum, which features exhibits on local history and culture, and the historic Callahan House, a beautiful Victorian mansion available for public tours and events. The city is also home to the Dougherty Museum, showcasing antique automobiles and farm equipment, and the St. Vrain State Park, which offers fishing, camping, and birdwatching opportunities. Longmont’s robust economy, community-focused amenities, and proximity to both Boulder and Denver make it an attractive place to live and work.
Lafayette
Area, Population, Zip Codes, and Coordinates
- Area: 9.6 square miles
- Population: Approximately 32,000 (2023 estimate)
- Zip Codes: 80026
- Latitude and Longitude: 39.9936° N, 105.0892° W
Location and History
Lafayette is a city located southeast of Boulder, known for its rich history and community-oriented atmosphere. The town was founded in 1888 by Mary Miller, who named it after her late husband, Lafayette Miller. Initially a coal mining town, Lafayette grew rapidly in the late 19th and early 20th centuries as mining attracted workers from across the country. After the decline of the coal industry, Lafayette transitioned into a residential community with a strong emphasis on preserving its historical character. Today, Lafayette is known for its vibrant arts scene, diverse population, and a strong sense of community, making it a desirable place to live in Boulder County.
Major Schools and Landmarks
Lafayette is part of the Boulder Valley School District, with Centaurus High School and Lafayette Elementary School being key educational institutions. Major landmarks in Lafayette include the Waneka Lake Park, a popular spot for outdoor recreation with trails, boating, and picnic areas, and the historic Mary Miller Theater, which hosts local performances and events. The Lafayette Miners Museum preserves the town’s mining heritage with exhibits and artifacts from the early coal mining days. The city also hosts the annual Lafayette Peach Festival, celebrating Colorado’s agricultural heritage. Lafayette’s combination of historic charm, cultural activities, and modern amenities make it a vibrant community in Boulder County.
Louisville
Area, Population, Zip Codes, and Coordinates
- Area: 8.0 square miles
- Population: Approximately 21,000 (2023 estimate)
- Zip Codes: 80027
- Latitude and Longitude: 39.9778° N, 105.1319° W
Location and History
Louisville is a city located just southeast of Boulder, known for its historic downtown and high quality of life. The town was established in 1877 as a coal mining community and named after Louis Nawatny, a local landowner. Louisville quickly became a hub for miners and their families, with numerous coal mines operating in the area. After the coal industry declined in the mid-20th century, Louisville transitioned into a residential suburb, known for its charming downtown, excellent schools, and strong sense of community. The city has consistently ranked as one of the best places to live in the United States, thanks to its combination of historic character, modern amenities, and proximity to Boulder and Denver.
Major Schools and Landmarks
Louisville is part of the Boulder Valley School District, with Monarch High School and Louisville Middle School being prominent educational institutions. Major landmarks include the Louisville Historical Museum, which preserves the town’s coal mining history with exhibits and historic buildings, and the vibrant Main Street, home to a variety of shops, restaurants, and community events. The Coal Creek Trail, a popular hiking and biking path, runs through the city, providing scenic views and access to open spaces. Louisville’s annual Labor Day Parade and Fall Festival are major community events that celebrate the town’s heritage and bring residents together. With its blend of history, community spirit, and modern conveniences, Louisville is a highly desirable place to live in Boulder County.
Superior
Area, Population, Zip Codes, and Coordinates
- Area: 4.0 square miles
- Population: Approximately 14,000 (2023 estimate)
- Zip Codes: 80027
- Latitude and Longitude: 39.9525° N, 105.1683° W
Location and History
Superior is a town located in the southeastern corner of Boulder County, just northwest of Denver. The town was founded in the late 19th century, originally as a coal mining community. Superior was named after the “superior” quality of coal found in the area, which attracted miners and their families. However, after the mines closed in the 1940s, the town’s population dwindled, and Superior remained a quiet, rural community for several decades. The late 20th century saw a resurgence in development, particularly with the creation of the Rock Creek Ranch subdivision, which transformed Superior into a suburban residential community. Today, Superior is known for its family-friendly neighborhoods, parks, and proximity to both Boulder and Denver.
Major Schools and Landmarks
Superior is served by the Boulder Valley School District, with Superior Elementary School and Monarch High School being the main educational institutions. Significant landmarks include the Superior Historical Museum, which offers a glimpse into the town’s coal mining past, and the extensive network of parks and open spaces, such as the Rock Creek Trail, which provides outdoor recreation opportunities for residents. The town is also close to the Flatiron Crossing Mall, a major shopping and entertainment destination. Superior’s blend of suburban comfort, historical roots, and access to urban amenities makes it a popular choice for families and professionals seeking a high quality of life in Boulder County.
Nederland
Area, Population, Zip Codes, and Coordinates
- Area: 1.6 square miles
- Population: Approximately 1,500 (2023 estimate)
- Zip Codes: 80466
- Latitude and Longitude: 39.9619° N, 105.5108° W
Location and History
Nederland is a small mountain town located in the western part of Boulder County, nestled in the Rocky Mountains near the Continental Divide. The town was established in the mid-19th century as a trading post and later developed as a mining town during Colorado’s silver boom. Nederland’s name is derived from the Dutch word for “Netherlands,” reflecting the town’s early connection to Dutch investors involved in local mining operations. After the mining industry declined, Nederland evolved into a quiet mountain community known for its laid-back lifestyle and strong connection to the natural environment. The town has a rich cultural heritage, with a vibrant arts scene and a reputation as a hub for outdoor recreation.
Major Schools and Landmarks
Nederland is served by the Boulder Valley School District, with Nederland Middle-Senior High School being the main educational institution. Major landmarks in Nederland include the Carousel of Happiness, a restored, hand-carved carousel that has become a beloved local attraction, and the Nederland Mining Museum, which offers exhibits on the town’s mining history. The town is also the gateway to the nearby Indian Peaks Wilderness, which provides opportunities for hiking, camping, and wildlife viewing in a pristine mountain setting. Nederland’s annual Frozen Dead Guy Days festival, celebrating the town’s quirky spirit, has gained national attention. Nederland’s unique combination of natural beauty, cultural vibrancy, and community pride makes it a special place within Boulder County.
Map of Cities in Boulder County, CO
