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/AFFTON

Affton ZIP codes, Missouri

No ZIP code is named for Affton, MO; addresses there use a neighbouring town's name. The ZIP code covering it is 63123. Its area codes are 314 and 557.

USPS city name
0 ZIP codes
Overlapping the city
1 more
Population
19,052
Area codes
314, 557

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

Affton in numbers

About 19,052 people live in Affton, in 8,695 households, the 41st-largest of Missouri's 1,062 census places. The median household income is $79,539 a year, 12% above the Missouri median of $70,702 (US: $80,734). The median owner-occupied home is valued at $212,400 (8% below the Missouri median), and median gross rent is $1,015 a month. The median age is 42.0; 36.6% of adults 25 and over hold a bachelor's degree or higher (32.4% across Missouri); the average commute takes 24 minutes.

Population19,052Affton19,052
Households8,695Affton8,695
Median age42.0Affton42.0Missouri39.0US 38.9
Median household income$79,539Affton$79,539Missouri$70,702US $80,734
Median home value$212,400Affton$212,400Missouri$230,300US $332,700
Median gross rent$1,015Affton$1,015Missouri$1,033US $1,413
Bachelor's degree or higher36.6%Affton36.6%Missouri32.4%US 35.7%
Mean commute23.5 minAffton23.5 minMissouri23.5 minUS 26.4 min
Population density4,169 / sq miAffton4,169 / sq mi

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

ZIP codes covering Affton

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

ZIP codes overlapping Affton
ZIP City Type Population Median income Median home
63123 Saint Louis , MO Standard 49,077 $77,055 $219,400

Map of Affton ZIP codes

63123

The ZIP codes of Affton, 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 Affton

The nearest larger towns are Webster Groves (23,712 people, 3.0 mi), Mehlville (29,805 people, 3.4 mi) and Kirkwood (29,363 people, 5.5 mi).

Towns near Affton
TownPopulationDistance
Green Park 2,690 1.9 mi
Lemay 16,228 2.5 mi
Shrewsbury 6,316 2.5 mi
Crestwood 12,295 2.8 mi
Webster Groves 23,712 3.0 mi
Concord 18,368 3.0 mi
Sappington 7,367 3.0 mi
Mehlville 29,805 3.4 mi
Glendale 6,114 4.3 mi
Maplewood 8,156 4.3 mi
Rock Hill 4,693 4.6 mi
Sunset Hills 9,112 4.7 mi
Brentwood 8,144 4.9 mi
Kirkwood 29,363 5.5 mi

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

Cite this page

zipcodes.pro. “Affton, MO ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/mo/affton

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