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/78523

78523

ZIP 78523 is in Brownsville, Texas, in Cameron County; area code 956; Central time. Brownsville has 5 ZIP codes; the others are 78520, 78521, 78522 and 78526.

Type
No street area
Time zone
America/Chicago
County
Cameron
Coordinates
25.9810, -97.5209

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 78520, whose figures describe that area — not this ZIP code.

☼ Live from 78523 — Brownsville, TX

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Where 78523 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 78523
  • 🔢 Type 78523 into a pocket calculator and turn it upside down: EZSBL — not quite a word, sorry.
  • ➕ As a number, 78,523 = 17 × 31 × 149. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10011001010111011
  • 🏠 Its numerical neighbours: 78522 (Brownsville, TX, 6 mi away) and 78526 (Brownsville, TX, 4 mi away).
  • 🔄 Backwards, 78523 becomes 32587, which is not a ZIP code at all.
  • 👥 57 other ZIP codes are made of exactly the same digits (23857, 23875, 25387, 25837, 25873, 27358, …). The farthest-flung twin is 83725 in Boise, ID, 1,607 miles away.
  • 🧭 Farther south than 98% of all ZIP codes, and farther west than 76%.
  • 🎯959 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 78523 and you would come out at 25.98°S, 82.48°E — 1,335 miles from West Island, Cocos Islands, the nearest big city to that spot.
  • ☀Longest day of the year: 13h 46m of daylight. Shortest: 10h 31m.
🌙 The sky over 78523 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments23This ZIP23
Employees373This ZIP373
Annual payroll$20,547,000This ZIP$20,547,000

Land area

ZIP codes near 78523

ZIPCityDistance
78520 Brownsville, TX 2.2 mi
78575 Olmito, TX 4.0 mi
78526 Brownsville, TX 4.5 mi
78522 Brownsville, TX 5.7 mi
78586 San Benito, TX 11.8 mi
78521 Brownsville, TX 12.9 mi
78566 Los Fresnos, TX 13.6 mi
78578 Port Isabel, TX 14.0 mi
78567 Los Indios, TX 14.2 mi
78568 Lozano, TX 14.5 mi

Find every ZIP code within 10 miles of 78523 →

Questions about this ZIP code

Where is ZIP code 78523?

78523 is in Brownsville, Texas, in Cameron County, part of the Brownsville-Harlingen, TX metropolitan area. Its published point location is 25.9810, -97.5209.

What county is 78523 in?

78523 lies in Cameron County.

What area code is 78523?

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

What time zone is 78523 in?

78523 uses America/Chicago.

What ZIP codes are near 78523?

The closest are 78520 (2.2 mi), 78575 (4 mi), 78526 (4.5 mi), 78522 (5.7 mi) and 78586 (11.8 mi).

Is 78523 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. “78523 ZIP Code — Brownsville, Texas (Cameron County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/78523

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/78523.json

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