ZIP Codes of Summit County, CO

Population & People
Population & People
Total Population
31,352
Household Income
Household Income
Median Income
$108,244
Housing
Housing
Total Housing Units
32,493
Business & Economy
Business & Economy
Total Businesses
2,305
Employment
Employment
Employment Rate
71.82%
Education
Education
Bachelor's Degree+
54.50%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 5 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:5 ZIP Codes (3 Standard, 2 PO Box, 0 Unique) [See All]
Area Code:970
Timezone:Mountain (GMT -07:00)
Local Time:2:11:34 PM
Population:31,352 [See All]
FIPS:08117
CBSA:Breckenridge, CO
Land Area:664 sq mi
Water Area:11 sq mi
Coordinates:39.5972, -106.0738
Quick Link:
https://www.zip-codes.com/county/co-summit.asp
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Colorado's #19 most populous county
31,352 residents across 5 ZIPs — #19 of 65 Colorado counties.

Standout ZIPs in this County


Most Populous
Breckenridge · 9,764 people
31.1% of county total
Highest Income
Breckenridge · $120,907 median
1.1× county average
Largest Land Area
Silverthorne · 291.1 sq mi
Spans the most ground
Fastest Growth
Silverthorne · 21.7% (10-yr)
7,299 → 8,881 residents
Most Educated
Frisco · 62.7% bachelor's+
1,980 of 3,156 adults 25+

Things worth knowing about Summit County


31,352 residents live across 5 ZIPs covering 664 sq mi, served by 4 distinct USPS-recognized cities.

Population moved from 28,118 to 31,352 from 2014 to 2024 — a +11.5% change. 4 ZIPs gained residents, 0 lost.

The county's wealthiest ZIP 80424 (Breckenridge, $120,907 median) and poorest ZIP 80435 (Dillon, $97,463) are 10.8 miles apart — a 1.2× income gap across local geography.

Median home values vary 1.3× across this county — from $824,200 in 80498 (Silverthorne) to $1,034,600 in 80424 (Breckenridge).

Density varies across the county — from 29 people/sq mi in 80443 (Frisco) to 91 in 80424 (Breckenridge).

Educational attainment ranges from 49.7% bachelor's+ in 80498 (Silverthorne) to 62.7% in 80443 (Frisco) — the breadth of educational profiles across the area.

Within Colorado, this is the #19 most populous of 65 counties and ranks #8 for median household income with the #20 fastest decade growth .

Weighted by population, the typical household earns about $108,585 across the county — reflecting what a typical resident sees, not a simple ZIP average.

54.5% of adults age 25+ hold a bachelor's degree or higher (13,295 of 24,394 reporting).

3 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Summit County


Higher-education hub

1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.

Frisco
62.7%
3,992 residents

Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
664
square miles
Avg density
47.2
people per sq mi
Population
31,352
across 5 ZIPs
Silverthorne
291.1 sq mi
8,881 residents
Frisco
139.9 sq mi
3,992 residents
Dillon
125.3 sq mi
8,715 residents

All ZIP Codes in Summit County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
80424BreckenridgeStandard9,764$120,907107.42.3%
80498SilverthorneStandard8,881$105,897291.121.7%
80435DillonStandard8,715$97,463125.39.9%
80443FriscoPO Box3,992$108,710139.919.3%
80497SilverthornePO Box0.0

Adjacent & Nearby Counties