About Boulder County
Panoramic landscape of Boulder County from US 36 at Davidson Mesa Scenic Overlook

About Boulder County Government

The county seat is the City of Boulder, the largest municipality in Boulder County. Other incorporated towns and cities include: Erie, Jamestown, Lafayette, Longmont, Louisville, Lyons, Nederland, Superior, and Ward. The estimated population of Boulder County in 2018 was just over 326,000.


Boulder County’s landscape features everything from farmland and rolling grasslands in the plains to the high peaks of the Continental Divide.

Located in north-central Colorado, northwest of Denver, the county’s landscape includes several dense urban centers surrounded by rural buffer zones and mountain communities, plus portions of Rocky Mountain National Park.

  • 741 square miles
  • Eastern slope of the Rocky Mountains
  • Elevation: Ranges from approximately 5,000 to more than 14,000 feet

Due to Boulder County’s unique land use decisions, most of its unincorporated areas remain rural in nature with the exception of the Niwot and Gunbarrel communities which were planned in accordance with the build out of the IBM facility at Hwy 52 and CO 119.

View Boulder County’s Vision & Values.

Boulder County Government

From visionary open space, land use and sustainability policies to forward-thinking public services programs, our county government helps foster a vibrant, healthy and active community.

Environmental Sustainability

Boulder County is a national leader in innovative sustainability efforts. The county’s EnergySmart Services service was honored with a national Innovation in Government Award. The Zero Waste initiative advocates for eliminating waste by modeling resource management on the waste-free and self-sustaining systems found in nature.

Open Space Conservation

The county has shown a dedication to preserving and maintaining its open space. Protecting open lands remains a core value of the government today. By providing activities, events and services that engage the community in open space conservation and recreation, Boulder County helps to ensure that critical wildlife habitats, farms and areas for recreation will be around for generations to come.

Supportive Community Programs

Programs such as the Circles Campaign, the Area Agency on Aging, the Community Action Program, Workforce Boulder County and the Boulder County Housing Authority provide residents with the tools and support they need. Boulder County works on important issues including food safety, medical and mental health services, wellness and nutrition, financial and transportation assistance, disease prevention, substance abuse and addiction, and aging services.

Transportation Services

Boulder County’s transportation programs are designed to increase mobility and reduce congestion throughout Boulder County. Providing a reliable network of roadways, bikeways, trails and transit service to the citizens of Boulder County while ensuring the health, safety and welfare of the public is our goal. Boulder County coordinates, provides and maintains a high quality, safe and multi-modal transportation networks and related services, in a responsive manner, within budget, on schedule, and resulting in high customer satisfaction.

Academia & Scientific Research in Boulder County


  • University of Colorado at Boulder
  • Naropa University
  • Front Range Community College
  • Boulder Valley School District
  • St. Vrain Valley School District

Scientific Facilities

  • National Center for Atmospheric Research (NCAR)
  • National Institute of Standards and Technology (NIST)
  • National Oceanic and Atmospheric Administration (NOAA)
  • National Ecological Observatory Network (NEON)

What’s in a Name? Boulder County cities and towns