Summit County ZIP Codes

Summit County is a county of Colorado.

ZIP codes: 5
Cities & towns: 4
Area codes: 2
Land area: 608 sq mi

Every ZIP code in Summit County

804xx

The complete list of Summit County, CO ZIP codes with the city each one delivers to.
ZIP code	City
80424	Breckenridge
80435	Dillon
80443	Frisco
80497	Silverthorne
80498	Silverthorne

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Summit County codes above are listed without a column we would have to invent.

Cities and towns in Summit County

Area codes covering Summit County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where Summit County's ZIP codes sit

Each point is the reference point of one Summit County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope every ZIP code recorded in Summit County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.