Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/CO/COUNTY/SUMMIT

Summit County, CO ZIP codes

Summit County, CO has 5 ZIP codes, in 4 towns: 80424, 80435, 80498, 80443 and 80497.

The county seat is Breckenridge.

ZIP codes
5
Towns
4
County seat
Breckenridge
County FIPS
08117
Population
31,017
Median household income
$109,773
Land area
608 sq mi
Metro area
Breckenridge

Summit County ZIP codes by town

Breckenridge (county seat)
80424

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

Map of Summit County ZIP codes

8042480435804438049780498

The ZIP codes of Summit County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Summit County in numbers

About 31,017 people live in Summit County, in 12,545 households, the 19th most populous of Colorado's 64 counties. The median household income is $109,773 a year, 15% above the Colorado median of $95,470 (US: $80,734). The median owner-occupied home is valued at $939,900 (74% above the Colorado median), and median gross rent is $1,928 a month. The median age is 39.5; 55.0% of adults 25 and over hold a bachelor's degree or higher (45.7% across Colorado); the average commute takes 21 minutes.

Population31,017Summit31,017
Households12,545Summit12,545
Median age39.5Summit39.5Colorado37.7US 38.9
Median household income$109,773Summit$109,773Colorado$95,470US $80,734
Median home value$939,900Summit$939,900Colorado$539,400US $332,700
Median gross rent$1,928Summit$1,928Colorado$1,761US $1,413
Bachelor's degree or higher55.0%Summit55.0%Colorado45.7%US 35.7%
Mean commute20.8 minSummit20.8 minColorado25.2 minUS 26.4 min
Population density51 / sq miSummit51 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Summit County

Largest towns in Summit County
TownZIP codesPopulation
Breckenridge 1 4,959
Silverthorne 2 4,815
Frisco 1 2,825
Dillon 1 832

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Summit County.

Not sure you are in Summit County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Summit County, with figures

ZIP codes in Summit County
ZIP City Type Population Median income Median home
80424 Breckenridge , CO Standard 9,764 $120,907 $1,034,600
80435 Dillon , CO Standard 8,715 $97,463 $941,600
80443 Frisco , CO Standard 3,992 $108,710 $909,000
80497 Silverthorne , CO No street area — — —
80498 Silverthorne , CO Standard 8,881 $105,897 $824,200

Cite this page

zipcodes.pro. “Summit County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/co/county/summit

Underlying data is public domain or openly licensed — sources, vintages and licences.