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 — CITY/MS/BAY-ST-LOUIS

Bay St. Louis ZIP codes, Mississippi

Bay St. Louis, MS has 2 ZIP codes (39520 and 39521) and area code 228. The largest is 39520.

USPS city name
2 ZIP codes
Overlapping the city
1 more
Population
10,188
Area code
228

Also written Bay Saint Louis, the spelling the Postal Service uses.

Mail addressed to Bay St. Louis uses the ZIP codes above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

Bay St. Louis in numbers

About 10,188 people live in Bay St. Louis, in 5,088 households, the 42nd-largest of Mississippi's 420 census places. The median household income is $67,442 a year, 19% above the Mississippi median of $56,447 (US: $80,734). The median owner-occupied home is valued at $260,200 (53% above the Mississippi median), and median gross rent is $1,179 a month. The median age is 53.3; 38.3% of adults 25 and over hold a bachelor's degree or higher (25.1% across Mississippi); the average commute takes 27 minutes.

Population10,188Bay St. Louis10,188
Households5,088Bay St. Louis5,088
Median age53.3Bay St. Louis53.3Mississippi38.6US 38.9
Median household income$67,442Bay St. Louis$67,442Mississippi$56,447US $80,734
Median home value$260,200Bay St. Louis$260,200Mississippi$169,800US $332,700
Median gross rent$1,179Bay St. Louis$1,179Mississippi$954US $1,413
Bachelor's degree or higher38.3%Bay St. Louis38.3%Mississippi25.1%US 35.7%
Mean commute27.1 minBay St. Louis27.1 minMississippi25.6 minUS 26.4 min
Population density693 / sq miBay St. Louis693 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Bay St. Louis city. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Bay Saint Louis

ZIP codes with the USPS city name Bay Saint Louis
ZIP City Type Population Median income Median home
39520 Bay Saint Louis , MS Standard 15,561 $62,176 $225,600
39521 Bay Saint Louis , MS No street area — — —

Other ZIP codes overlapping Bay St. Louis

These ZIP codes cover part of Bay St. Louis but are addressed as somewhere else.

ZIP codes overlapping Bay St. Louis
ZIP City Type Population Median income Median home
39556 Kiln , MS Standard 6,041 $60,739 $171,200

Map of Bay St. Louis ZIP codes

3952039521

The ZIP codes of Bay St. Louis, MS, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Bay St. Louis

The nearest larger towns are Long Beach (17,009 people, 12 mi), Gulfport (73,003 people, 19 mi) and Picayune (11,900 people, 23 mi).

Towns near Bay St. Louis
TownPopulationDistance
Waveland 7,062 2.8 mi
Diamondhead 9,338 4.1 mi
Pass Christian 6,097 7.1 mi
Long Beach 17,009 11.9 mi
Gulfport 73,003 18.5 mi
Nicholson 3,146 23.2 mi
Picayune 11,900 23.5 mi
Pearl River, LA 2,614 23.6 mi
Hide-A-Way Lake 2,569 24.3 mi
Slidell, LA 28,561 25.4 mi
Biloxi 48,861 26.2 mi
Eden Isle, LA 7,683 27.7 mi
D'Iberville 13,203 28.8 mi

More nearby: every ZIP code in Hancock County · Mississippi ZIP codes

Cite this page

zipcodes.pro. “Bay St. Louis, MS ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/ms/bay-st-louis

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