Cities in Broomfield County, Colorado by Population (2024)

There are 10 cities in Broomfield County, Colorado.

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

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City
Rank
State
2024 Population
2020 Census
Annual Change
Density (mi²)
Area (mi²)
Thornton1Colorado144,388142,1760.38%3,95536.50
Westminster2Colorado112,764116,302-0.78%3,56631.62
Broomfield3Colorado77,75874,4841.06%2,35932.97
Northglenn4Colorado38,17438,0380.09%5,1877.36
Erie5Colorado35,80330,4053.92%1,72620.74
Lafayette6Colorado30,97630,4220.45%3,3569.23
Louisville7Colorado19,94721,173-1.51%2,5027.97
Frederick8Colorado19,59214,7246.62%1,28815.21
Federal Heights9Colorado13,60814,394-1.42%7,6661.77
Dacono10Colorado6,6286,3481.07%7159.28

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Broomfield County, Colorado?

Thornton is the largest city in Broomfield County.

What is the smallest city in Broomfield County, Colorado?

Dacono is the smallest city in Broomfield County.

How many cities are in Broomfield County?

There are 10 cities in Broomfield County, Colorado.

Frequently Asked Questions