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/81102

81102

ZIP 81102 is in Alamosa, Colorado, in Alamosa County; area code 719; Mountain time. Alamosa has 2 ZIP codes; the other is 81101.

Type
No street area
Time zone
America/Denver
County
Alamosa
Metro area
Alamosa, CO
Coordinates
37.4760, -105.8818

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 81101, whose figures describe that area — not this ZIP code.

☼ Live from 81102 — Alamosa, CO

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Where 81102 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 81102
  • 🔢 Type 81102 into a pocket calculator and turn it upside down: ZOIIB — not quite a word, sorry.
  • ➕ As a number, 81,102 = 2 × 3 × 7 × 1931. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011110011001110
  • 🏠 Its numerical neighbours: 81101 (Alamosa, CO, 2 mi away) and 81120 (Antonito, CO, 32 mi away).
  • 🔄 Backwards, 81102 becomes 20118 — and that is a real ZIP code: Middleburg, VA, 1,525 miles away.
  • 👥 34 other ZIP codes are made of exactly the same digits (01128, 01812, 01821, 02118, 10128, 10281, …). The farthest-flung twin is 02118 in Boston, MA, 1,862 miles away.
  • 🧭 Farther south than 62% of all ZIP codes, and farther west than 83%.
  • 🎯426 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 81102 and you would come out at 37.48°S, 74.12°E — 843 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 45m of daylight. Shortest: 9h 34m.
🌙 The sky over 81102 today
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🌋 Shake report
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Source: USGS.

Land area

ZIP codes near 81102

ZIPCityDistance
81101 Alamosa, CO 1.7 mi
81135 Homelake, CO 13.7 mi
81144 Monte Vista, CO 15.1 mi
81146 Mosca, CO 16.6 mi
81136 Hooper, CO 17.2 mi
81123 Blanca, CO 17.9 mi
81124 Capulin, CO 18.1 mi
81151 Sanford, CO 18.8 mi
81140 La Jara, CO 19.6 mi
81141 Manassa, CO 21.7 mi

Find every ZIP code within 10 miles of 81102 →

Questions about this ZIP code

Where is ZIP code 81102?

81102 is in Alamosa, Colorado, in Alamosa County, part of the Alamosa, CO micropolitan area. Its published point location is 37.4760, -105.8818.

What county is 81102 in?

81102 lies in Alamosa County.

What area code is 81102?

Alamosa uses area code 719, from NANPA's telephone records.

What time zone is 81102 in?

81102 uses America/Denver.

What ZIP codes are near 81102?

The closest are 81101 (1.7 mi), 81135 (13.7 mi), 81144 (15.1 mi), 81146 (16.6 mi) and 81136 (17.2 mi).

Is 81102 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.

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zipcodes.pro. “81102 ZIP Code — Alamosa, Colorado (Alamosa County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/81102

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