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 — CITY/CO/LONGMONT

Longmont ZIP codes, Colorado

Longmont, CO has 4 ZIP codes (80504, 80501, 80503 and 80502) and area codes 720, 303 and 983. The largest is 80504.

USPS city name
4 ZIP codes
Population
99,406
Area codes
720, 303, 983

Longmont in numbers

About 99,406 people live in Longmont, in 42,155 households, the 14th-largest of Colorado's 471 census places. The median household income is $90,671 a year, 5% below the Colorado median of $95,470 (US: $80,734). The median owner-occupied home is valued at $572,800 (6% above the Colorado median), and median gross rent is $1,816 a month. The median age is 40.3; 47.0% of adults 25 and over hold a bachelor's degree or higher (45.7% across Colorado); the average commute takes 25 minutes.

Population99,406Longmont99,406
Households42,155Longmont42,155
Median age40.3Longmont40.3Colorado37.7US 38.9
Median household income$90,671Longmont$90,671Colorado$95,470US $80,734
Median home value$572,800Longmont$572,800Colorado$539,400US $332,700
Median gross rent$1,816Longmont$1,816Colorado$1,761US $1,413
Bachelor's degree or higher47.0%Longmont47.0%Colorado45.7%US 35.7%
Mean commute24.5 minLongmont24.5 minColorado25.2 minUS 26.4 min
Population density3,397 / sq miLongmont3,397 / sq mi

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

ZIP codes addressed as Longmont

ZIP codes with the USPS city name Longmont
ZIP City Type Population Median income Median home
80504 Longmont , CO Standard 63,451 $113,643 $591,700
80501 Longmont , CO Standard 44,147 $80,911 $488,800
80503 Longmont , CO Standard 35,846 $113,620 $755,500
80502 Longmont , CO No street area — — —

Map of Longmont ZIP codes

80504805018050380502

The ZIP codes of Longmont, CO, 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.

Towns near Longmont

The nearest larger towns are Boulder (106,433 people, 13 mi), Thornton (144,187 people, 19 mi) and Westminster (115,484 people, 20 mi).

Towns near Longmont
TownPopulationDistance
Niwot 3,447 5.8 mi
Mead 5,919 7.2 mi
Frederick 16,651 7.9 mi
Firestone 18,049 8.1 mi
Gunbarrel 10,051 8.2 mi
Erie 33,808 9.4 mi
Berthoud 12,411 10.7 mi
Dacono 6,530 10.9 mi
Lafayette 30,602 12.0 mi
Boulder 106,433 12.7 mi
Johnstown 18,883 13.9 mi
Louisville 20,786 13.9 mi
Platteville 2,928 14.6 mi
Broomfield 76,304 15.1 mi

More nearby: every ZIP code in Boulder County · Colorado ZIP codes

Cite this page

zipcodes.pro. “Longmont, CO ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/co/longmont

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