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/MO/WELDON-SPRING

Weldon Spring ZIP codes, Missouri

No ZIP code is named for Weldon Spring, MO; addresses there use a neighbouring town's name. The ZIP code covering it is 63304. Its area code is 636.

USPS city name
0 ZIP codes
Overlapping the city
1 more
Population
5,310
Area code
636

NANPA lists no telephone rate centre for Weldon Spring itself, so these are the area codes of the nearest one, Saint Charles (0.0 miles). A town on an area-code boundary can differ from its neighbour.

Weldon Spring in numbers

About 5,310 people live in Weldon Spring, in 2,038 households. The median household income is $158,548 a year, 2.2 times the Missouri median of $70,702 (US: $80,734). The median owner-occupied home is valued at $544,300 (2.4 times the Missouri median), and median gross rent is $2,800 a month. The median age is 52.2; 57.9% of adults 25 and over hold a bachelor's degree or higher (32.4% across Missouri); the average commute takes 22 minutes.

Population5,310Weldon Spring5,310
Households2,038Weldon Spring2,038
Median age52.2Weldon Spring52.2Missouri39.0US 38.9
Median household income$158,548Weldon Spring$158,548Missouri$70,702US $80,734
Median home value$544,300Weldon Spring$544,300Missouri$230,300US $332,700
Median gross rent$2,800Weldon Spring$2,800Missouri$1,033US $1,413
Bachelor's degree or higher57.9%Weldon Spring57.9%Missouri32.4%US 35.7%
Mean commute21.7 minWeldon Spring21.7 minMissouri23.5 minUS 26.4 min
Population density694 / sq miWeldon Spring694 / sq mi

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

ZIP codes covering Weldon Spring

These ZIP codes cover part of Weldon Spring but are addressed as somewhere else.

ZIP codes overlapping Weldon Spring
ZIP City Type Population Median income Median home
63304 Saint Charles , MO Standard 43,195 $114,442 $351,000

Map of Weldon Spring ZIP codes

63304

The ZIP codes of Weldon Spring, MO, 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 Weldon Spring

The nearest larger towns are Cottleville (5,937 people, 2.9 mi), Dardenne Prairie (13,503 people, 4.0 mi) and Chesterfield (49,574 people, 5.4 mi).

Towns near Weldon Spring
TownPopulationDistance
Cottleville 5,937 2.9 mi
Dardenne Prairie 13,503 4.0 mi
Chesterfield 49,574 5.4 mi
St. Peters 59,092 5.7 mi
O'Fallon 93,801 6.4 mi
Clarkson Valley 2,584 6.6 mi
Lake St. Louis 18,066 8.7 mi
Ellisville 10,002 9.0 mi
Wildwood 35,133 9.2 mi
St. Charles 71,508 9.5 mi
Ballwin 31,279 9.7 mi
Maryland Heights 27,880 9.8 mi
St. Paul 3,456 10.7 mi
Town and Country 11,607 10.9 mi

More nearby: every ZIP code in St. Charles County · Missouri ZIP codes

Cite this page

zipcodes.pro. “Weldon Spring, MO ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/mo/weldon-spring

Underlying data is public domain or openly licensed — sources, vintages and licences.