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/39521

39521

ZIP 39521 is in Bay Saint Louis, Mississippi, in Hancock County; area code 228; Central time. Bay Saint Louis has 2 ZIP codes; the other is 39520.

Type
No street area
Time zone
America/Chicago
County
Hancock
Metro area
Gulfport-Biloxi, MS
Coordinates
30.4032, -89.4982

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 39556, whose figures describe that area — not this ZIP code.

☼ Live from 39521 — Bay Saint Louis, MS

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Local time: —

Where 39521 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 39521
  • 🔢 Type 39521 into a pocket calculator and turn it upside down: IZSGE — not quite a word, sorry.
  • ➕ 39521 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 20, a total 2,586 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1001101001100001
  • 🏠 Its numerical neighbours: 39520 (Bay Saint Louis, MS, 9 mi away) and 39522 (Stennis Space Center, MS, 0 mi away).
  • 🔄 Backwards, 39521 becomes 12593, which is not a ZIP code at all.
  • 👥 49 other ZIP codes are made of exactly the same digits (12935, 12953, 15239, 15329, 15923, 19352, …). The farthest-flung twin is 95123 in San Jose, CA, 1,905 miles away.
  • 🧭 Farther south than 92% of all ZIP codes, and farther west than 54%.
  • 🎯828 miles southeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 39521 and you would come out at 30.40°S, 90.50°E — 1,324 miles from West Island, Cocos Islands, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 07m of daylight. Shortest: 10h 11m.
🌙 The sky over 39521 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments9This ZIP9
Employees29This ZIP29
Annual payroll$1,362,000This ZIP$1,362,000

Land area

ZIP codes near 39521

ZIPCityDistance
39522 Stennis Space Center, MS 0.0 mi
39556 Kiln, MS 4.9 mi
39529 Stennis Space Center, MS 6.3 mi
39525 Diamondhead, MS 7.7 mi
39520 Bay Saint Louis, MS 9.3 mi
39576 Waveland, MS 10.4 mi
39466 Picayune, MS 11.6 mi
39558 Lakeshore, MS 11.6 mi
39463 Nicholson, MS 11.6 mi
39572 Pearlington, MS 12.3 mi

Find every ZIP code within 10 miles of 39521 →

Questions about this ZIP code

Where is ZIP code 39521?

39521 is in Bay Saint Louis, Mississippi, in Hancock County, part of the Gulfport-Biloxi, MS metropolitan area. Its published point location is 30.4032, -89.4982.

What county is 39521 in?

39521 lies in Hancock County.

What area code is 39521?

Bay Saint Louis uses area code 228, from NANPA's telephone records.

What time zone is 39521 in?

39521 uses America/Chicago.

What ZIP codes are near 39521?

The closest are 39522 (0 mi), 39556 (4.9 mi), 39529 (6.3 mi), 39525 (7.7 mi) and 39520 (9.3 mi).

Is 39521 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. “39521 ZIP Code — Bay Saint Louis, Mississippi (Hancock County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/39521

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/39521.json

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