Summit County has seven towns plus unincorporated county land

Summit County is small on the map, but it holds a surprising number of governments.

Inside the county there are seven incorporated towns: Blue River, Breckenridge, Dillon, Frisco, Keystone, Montezuma, and Silverthorne. Everything outside those town limits is unincorporated land, governed directly by Summit County. So the same county can hold eight different sets of local rules at once — one for each town, plus the county’s own.

Why this matters to anyone moving here: the rule-maker for a property depends on which town it sits in, or whether it sits in none of them. Zoning, building, parking, short-term rentals, and local taxes can all differ across that line. Two condos a short walk apart may answer to different governments. A street name or a resort name does not tell you the answer — Keystone, for example, only became its own town in 2024, while Breckenridge has governed itself for well over a century.

Before relying on any local rule, confirm which jurisdiction your address falls in. The county and each town can tell you, and the state demographer lists the county’s municipalities.