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County ZIP codes · Colorado · FIPS 08117

Summit County, CO ZIP Codes

Summit County, Colorado has 5 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 4 residential and 1 for PO boxes or a single organization. 1 of the residential ones extends into a neighboring county. Median household income ranges from $105,897 in 80498 (Silverthorne) to $108,710 in 80443 (Frisco) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Summit County?

80424 · Breckenridge: $121k80435 · Dillon: $98k80443 · Frisco: $109k80498 · Silverthorne: $106k8049880424804358044380424 · Breckenridge: $121k80435 · Dillon: $98k80443 · Frisco: $109k80498 · Silverthorne: $106k8049880424804358044380424 · Breckenridge: $121k80435 · Dillon: $98k80443 · Frisco: $109k80498 · Silverthorne: $106k80498804248043580443
The residential ZIP codes of Summit County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

They carry 4 postal town names: Breckenridge, Silverthorne, Dillon, Frisco.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 4 residential ZIP codes in Summit County

Residential ZIP codes mainly in Summit County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
80424 Breckenridge 9,764 78 $121k $1.03M 100%
80498 Silverthorne 8,881 30 $106k $824k 94%
80435 Dillon 8,715 84 $98k $942k 100%
80443 Frisco 3,992 39 $109k $909k 100%

Download the 5 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

1 ZIP code of Summit County extends into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Summit County and in the neighboring counties
ZIPIn SummitElsewhere
8049894%Grand County 6%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Summit County without a residential area (GeoNames postal codes)
ZIPPostal name
80497Silverthorne

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Summit County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Summit County starts with 804.

Three-digit prefixes of Summit County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Summit County's
PrefixSectional centerHereAll codes
804 Denver, CO (SCF 800) 5 63

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.