Summit County, Colorado Cities (2024)

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.)

City
Rank
2024 Pop.
2020 Pop.
Change
Density (/mi²)
Area (mi²)
Type
Silverthorne15,1014,4553.26%1,2564.1Town
Breckenridge24,9015,055-0.79%8116.0Town
Frisco32,7092,924-1.95%1,6221.7Town
Dillon49991,065-1.67%6731.5Town
Keystone5981799-0.71%2441.4CDP
Blue River6844876-0.94%3472.4Town
Copper Mountain7268455-3.25%832.1CDP
Montezuma87076-2.78%8860.1Town

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 Summit County, Colorado?

Silverthorne is the largest city in Summit County.

What is the smallest city in Summit County, Colorado?

Montezuma is the smallest city in Summit County.

How many cities are in Summit County?

There are 8 cities in Summit County, Colorado.

Frequently Asked Questions