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/FRONTENAC

Frontenac ZIP codes, Missouri

No ZIP code is named for Frontenac, MO; addresses there use a neighbouring town's name. The ZIP code covering it is 63131.

USPS city name
0 ZIP codes
Overlapping the city
1 more
Population
3,701

Frontenac in numbers

About 3,701 people live in Frontenac, in 1,197 households. The median household income is $233,425 a year, 3.3 times the Missouri median of $70,702 (US: $80,734). The median owner-occupied home is valued at $979,800 (4.3 times the Missouri median). The median age is 46.3; 79.9% of adults 25 and over hold a bachelor's degree or higher (32.4% across Missouri); the average commute takes 25 minutes.

Population3,701Frontenac3,701
Households1,197Frontenac1,197
Median age46.3Frontenac46.3Missouri39.0US 38.9
Median household income$233,425Frontenac$233,425Missouri$70,702US $80,734
Median home value$979,800Frontenac$979,800Missouri$230,300US $332,700
Bachelor's degree or higher79.9%Frontenac79.9%Missouri32.4%US 35.7%
Mean commute24.8 minFrontenac24.8 minMissouri23.5 minUS 26.4 min
Population density1,285 / sq miFrontenac1,285 / sq mi

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

ZIP codes covering Frontenac

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

ZIP codes overlapping Frontenac
ZIP City Type Population Median income Median home
63131 Saint Louis , MO Standard 17,935 $225,493 $778,100

Map of Frontenac ZIP codes

63131

The ZIP codes of Frontenac, 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 Frontenac

The nearest larger towns are Ladue (8,940 people, 1.9 mi), Creve Coeur (18,643 people, 2.6 mi) and Des Peres (9,170 people, 2.6 mi).

Towns near Frontenac
TownPopulationDistance
Ladue 8,940 1.9 mi
Creve Coeur 18,643 2.6 mi
Des Peres 9,170 2.6 mi
Town and Country 11,607 3.1 mi
Rock Hill 4,693 3.1 mi
Glendale 6,114 3.2 mi
Kirkwood 29,363 3.5 mi
Olivette 8,645 3.6 mi
Brentwood 8,144 3.9 mi
Webster Groves 23,712 4.6 mi
Richmond Heights 9,153 4.6 mi
Clayton 17,380 4.9 mi
Maplewood 8,156 5.3 mi
Overland 15,695 5.3 mi

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

Cite this page

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

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