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/78551

78551

ZIP 78551 is in Harlingen, Texas, in Cameron County; area code 956; Central time. Harlingen has 4 ZIP codes; the others are 78550, 78552 and 78553.

Type
No street area
Time zone
America/Chicago
County
Cameron
Coordinates
26.2447, -97.7206

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 78550, whose figures describe that area — not this ZIP code.

☼ Live from 78551 — Harlingen, TX

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Where 78551 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 78551
  • 🔢 Type 78551 into a pocket calculator and turn it upside down: ISSBL — not quite a word, sorry.
  • ➕ As a number, 78,551 = 11 × 37 × 193. Its digits add up to 26, a total 2,038 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011001011010111
  • 🏠 Its numerical neighbours: 78550 (Harlingen, TX, 4 mi away) and 78552 (Harlingen, TX, 4 mi away).
  • 🔄 Backwards, 78551 becomes 15587, which is not a ZIP code at all.
  • 👥 18 other ZIP codes are made of exactly the same digits (15758, 15857, 17585, 17855, 51578, 55187, …). The farthest-flung twin is 17585 in Witmer, PA, 1,561 miles away.
  • 🧭 Farther south than 98% of all ZIP codes, and farther west than 76%.
  • 🎯940 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 78551 and you would come out at 26.24°S, 82.28°E — 1,357 miles from West Island, Cocos Islands, the nearest big city to that spot.
  • ☀Longest day of the year: 13h 47m of daylight. Shortest: 10h 30m.
🌙 The sky over 78551 today
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Source: USGS.

Business and tax activity

Business establishments30This ZIP30
Employees1,178This ZIP1,178
Annual payroll$55,710,000This ZIP$55,710,000

Land area

ZIP codes near 78551

ZIPCityDistance
78535 Combes, TX 0.7 mi
78550 Harlingen, TX 3.6 mi
78552 Harlingen, TX 4.0 mi
78553 Harlingen, TX 4.0 mi
78593 Santa Rosa, TX 6.7 mi
78594 Sebastian, TX 8.8 mi
78569 Lyford, TX 9.4 mi
78559 La Feria, TX 9.4 mi
78586 San Benito, TX 10.4 mi
78562 La Villa, TX 10.9 mi

Find every ZIP code within 10 miles of 78551 →

Questions about this ZIP code

Where is ZIP code 78551?

78551 is in Harlingen, Texas, in Cameron County, part of the Brownsville-Harlingen, TX metropolitan area. Its published point location is 26.2447, -97.7206.

What county is 78551 in?

78551 lies in Cameron County.

What area code is 78551?

Harlingen uses area code 956, from NANPA's telephone records.

What time zone is 78551 in?

78551 uses America/Chicago.

What ZIP codes are near 78551?

The closest are 78535 (0.7 mi), 78550 (3.6 mi), 78552 (4 mi), 78553 (4 mi) and 78593 (6.7 mi).

Is 78551 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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Cite this page

zipcodes.pro. “78551 ZIP Code — Harlingen, Texas (Cameron County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78551

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/78551.json

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