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 — ZIP/80638

80638

ZIP 80638 is in Greeley, Colorado, in Weld County; area code 970; Mountain time. Greeley has 6 ZIP codes; the others are 80631, 80632, 80633, 80634 and 80639.

Type
No street area
Time zone
America/Denver
County
Weld
Metro area
Greeley, CO
Coordinates
40.4233, -104.7091

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 80631, whose figures describe that area — not this ZIP code.

☼ Live from 80638 — Greeley, CO

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 80638 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 80638
  • 🔢 Type 80638 into a pocket calculator and turn it upside down: BEgOB — not quite a word, sorry.
  • ➕ As a number, 80,638 = 2 × 23 × 1753. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011101011111110
  • 🏠 Its numerical neighbours: 80634 (Greeley, CO, 5 mi away) and 80639 (Greeley, CO, 2 mi away).
  • 🔄 Backwards, 80638 becomes 83608, which is not a ZIP code at all.
  • 👥 25 other ZIP codes are made of exactly the same digits (03868, 03886, 06388, 06838, 06883, 08638, …). The farthest-flung twin is 03868 in Rochester, NH, 1,737 miles away.
  • 🧭 Farther north than 60% of all ZIP codes, and farther west than 82%.
  • 🎯326 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 80638 and you would come out at 40.42°S, 75.29°E — 664 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 04m of daylight. Shortest: 9h 17m.
🌙 The sky over 80638 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Land area

ZIP codes near 80638

ZIPCityDistance
80633 Greeley, CO 0.0 mi
80639 Greeley, CO 1.7 mi
80631 Greeley, CO 2.2 mi
80620 Evans, CO 3.3 mi
80646 Lucerne, CO 3.6 mi
80632 Greeley, CO 4.3 mi
80634 Greeley, CO 4.6 mi
80615 Eaton, CO 9.1 mi
80543 Milliken, CO 9.3 mi
80645 La Salle, CO 10.2 mi

Find every ZIP code within 10 miles of 80638 →

Questions about this ZIP code

Where is ZIP code 80638?

80638 is in Greeley, Colorado, in Weld County, part of the Greeley, CO metropolitan area. Its published point location is 40.4233, -104.7091.

What county is 80638 in?

80638 lies in Weld County.

What area code is 80638?

Greeley uses area code 970, from NANPA's telephone records.

What time zone is 80638 in?

80638 uses America/Denver.

What ZIP codes are near 80638?

The closest are 80633 (0 mi), 80639 (1.7 mi), 80631 (2.2 mi), 80620 (3.3 mi) and 80646 (3.6 mi).

Is 80638 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

Download or cite

Cite this page

zipcodes.pro. “80638 ZIP Code — Greeley, Colorado (Weld County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/80638

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/80638.json

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