Broomfield, CO

Broomfield's consolidated government began with a practical boundary problem. As the municipality annexed land, it became Colorado's only city spread across four counties, leaving different parcels tied to different county services. Voters statewide approved a constitutional amendment on November 3, 1998, and the City and County of Broomfield officially became Colorado's 64th county on November 15, 2001. The city council now also serves as the county board of commissioners. This arrangement gives one local government responsibility for municipal and county functions across a jurisdiction of nearly 34 square miles. The single jurisdiction eliminated the former four-county service split. That combined government shapes practical parts of life in Broomfield, from elections and public records to courts, public health, and open-land management. Archaeological evidence traces human use of the area back at least 7,000 years, long before nineteenth-century farming settlements and modern annexations.

ATTRDepartment of the Interior. Solid Fuels Administration For War. 4/19/1943-6/30/1947 / Public domain

The modern community took shape along the corridor between Denver and Boulder. An electric interurban arrived in the early twentieth century, and construction of the Denver-Boulder Turnpike began in 1950. Broomfield Heights followed in 1955 as a master-planned development, and the city incorporated in 1961. Annexations brought portions of today's Interlocken into Broomfield in 1983 and 1986. Today US 36, Interstate 25, and nearby Rocky Mountain Metropolitan Airport connect several distinct employment districts. A 2025 financial report counted over 42,000 jobs in Broomfield and described concentrations in aerospace, technology, financial services, and business and scientific research, with manufacturing also represented. Interlocken grew into a major office center, while the Flatiron Crossing area added a large retail district near the US 36 corridor.

ATTRDmannsuperdude / CC BY-SA 4.0

Broomfield Days occupies older Broomfield each September. The event began decades ago as a nonprofit fundraiser and is traditionally held on the third Saturday of the month at Midway Park. For September 19, 2026, the city scheduled a morning pancake breakfast and 5K, a parade along Midway Boulevard, performances on three stages, a car show, and a duck race, with hundreds of vendors in the park. The parade uses a neighborhood boulevard and most activities gather around one municipal park near the center of the original planned community. Midway Park belongs to older Broomfield, away from the office and retail districts along US 36.

ATTRTony Webster / CC BY 2.0

Regional transit follows the Denver-Boulder axis. RTD's Flatiron Flyer bus rapid transit service stops at US 36 and Broomfield and at the Flatiron station, linking local riders with Denver, Westminster, Louisville, Superior, and Boulder. Away from the highway corridor, Broomfield has retained a substantial amount of undeveloped land within its planning area. City figures updated in March 2026 counted 8,699 acres of public and private open space, parks, and open lands, equal to 36 percent of the planning area. The total includes Broomfield-owned sites as well as jointly protected land with Boulder County. The Flatiron Flyer follows the turnpike corridor that shaped modern Broomfield; beyond the office campuses and subdivisions, joint open-space holdings continue into Boulder County.