Summit County, Colorado

Summit County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF SUMMIT GUS Population: 30,882 (2024) ID: 161325	County	Official County Government	Contact: FINANCE DIRECTOR PO BOX 68, BRECKENRIDGE CO 80424-0068
TOWN OF SILVERTHORNE GUS Population: 5,220 (2024) ID: 123759	Municipal	Municipal Government Within County	Contact: FINANCE DIRECTOR PO BOX 1309, SILVERTHORNE CO 80498-1309
TOWN OF BRECKENRIDGE GUS Population: 4,892 (2024) ID: 161418	Municipal	Municipal Government Within County	Contact: ACCOUNTING MANAGER PO BOX 168, BRECKENRIDGE CO 80424-0168
TOWN OF FRISCO GUS Population: 2,732 (2024) ID: 204125	Municipal	Municipal Government Within County	Contact: ACCOUNTANT PO BOX 4100, FRISCO CO 80443-4100
TOWN OF KEYSTONE GUS Population: 1,369 (2023) ID: 252743	Municipal	Municipal Government Within County	Contact: TOWN HALL 1628 ST JOHN RD, KEYSTONE CO 80435
TOWN OF DILLON GUS Population: 1,013 (2024) ID: 101431	Municipal	Municipal Government Within County	Contact: FINANCE DIRECTOR PO BOX 8, DILLON CO 80435-0008
TOWN OF BLUE RIVER GUS Population: 836 (2024) ID: 161420	Municipal	Municipal Government Within County	Contact: TREASURER PO BOX 1784, BRECKENRIDGE CO 80424-1784
TOWN OF MONTEZUMA GUS Population: 71 (2024) ID: 161419	Municipal	Municipal Government Within County	Contact: MAYOR 5425 MONTEZUMA RD, MONTEZUMA CO 80435-7621