Broomfield County area

Population and density of Broomfield County

The Census Bureau estimates that 79,174 people lived in Broomfield County on July 1, 2025. That ranks #742 of 3,222 county equivalents nationally and #12 of 64 in Colorado. Since the April 1, 2020 estimates base of 74,103, the population has grown by 5,071 (+6.8%), compared with +4.1% for Colorado as a whole.

With 33 square miles of land, that is 2,402 people per square mile (927 per km²), placing Broomfield County #63 nationally for density and #2 in Colorado. The median county equivalent has 47 people per square mile; the Colorado median is 11. Put another way, there are about 0.266 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Broomfield County

Every resident of Broomfield County lives within Broomfield city. The city and the county equivalent cover the same territory, 33 square miles of land in the 2026 place Gazetteer, so there are no separate towns or unincorporated areas to list.

Metropolitan area

Broomfield County is a central county of the Denver-Aurora-Centennial, CO Metropolitan Statistical Area. Its 10 county equivalents have 3,092,037 residents on 8,344.7 square miles of land; Broomfield County accounts for 0.4% of the land and 2.6% of the residents. By combined land it ranks #14 of 393 metropolitan areas, and #19 by population. It belongs to the Denver-Aurora-Greeley, CO Combined Statistical Area.

ZIP codes

6 ZIP Code Tabulation Areas have land in Broomfield County; 2 of them have most of their land inside the county, and the others mainly cover neighboring areas.

800208002180023800268023480516

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Broomfield County

Broomfield County shares a land border with 4 county equivalents. Each of them has more land than Broomfield County. The largest neighbor is Weld County (3,985 mi²) and the smallest is Boulder County (726.4 mi²). Together with its neighbors, Broomfield County forms a block of 6,675.6 mi² of land, of which it holds 0.5%.

How big is Broomfield County compared with U.S. states?

Broomfield County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 31 times as much. Colorado’s county land could hold about 3,144 areas the size of Broomfield County.

Another way to picture it: the same land area would fill a square about 5.74 miles (9.2 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Broomfield County?

Broomfield County has more land than 58 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Broomfield County at #3,181 nationally by total area, 17 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 1.7%, compared with a national county-equivalent median of 1.2% — 0.6 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Broomfield County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.