Summit County Permanent Resident Population

The following table provides an overview of the distribution of the permanent resident population in Summit County. These population numbers are based on U.S. Census data and annual population estimates prepared by the State Demography Office in the Colorado Division of Local Government.
Summit County Permanent Resident Population
Area
1970
1980
1990
2000
20101
20172
Incorporated Areas

Breckenridge
548
818
1,285
2,408
4,540 4,901
Blue River
8
230
440
685
849 918
Dillon
182
337
553
802
904
961
Frisco
471
1,221
1,601
2,443
2,683
3,124
Montezuma
N/A
N/A
60
42
65
68
Silverthorne
400
989
1,768
3,196
3,887
4,636
Subtotal
1,609
3,595
5,707
9,576
12,928
14,608
Unincorporated Areas

Lower Blue Basin


2,533
4,592
3,672
4,034
Snake River Basin


1,765
4,187
6,726
7,391
Ten Mile Basin


532
837
1,292
1,419
Upper Blue Basin


2,344
4,356
3,376
3,710
Subtotal
1,056
5,253
7,174
13,972
15,066
15,947
Summit County Total
2,665
8,848
12,881
23,548
27,994
30,622
1The 1970 - 2010 population numbers are based on U.S. Census data.
2The 2017 population is based on the most recent population estimates published by the State Demographer.

(View a locator map (PDF), depicting the four planning basins and six incorporated towns within Summit County.)

Approximately 52% of the permanent residents in the county live in unincorporated areas (properties located outside of town boundaries). The County's Snake River Basin has become the most populated of the unincorporated areas, primarily due to the increased permanent resident population in the Summit Cove and Dillon Valley neighborhoods (currently the two largest and most densely populated neighborhoods in unincorporated Summit County). Among the incorporated towns, the permanent resident population of Breckenridge has increased most dramatically since 2000, growing by approximately 104% (2,619 residents).

The most recent population estimate released by the State Demographer indicates that, as of July 2017, the permanent resident population of Summit County was 30,622, with an unincorporated county population of 15,947. This represents an 9% increase in permanent residents from the 2010 Census. The State Demography Office estimates population in arrears as of July 1 of each year (e.g., the 2016 population estimate will be released by the State Demographer in 2017).