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US ZIP Code Profile

ZIP Code 63121
Saint Louis, Missouri

ZIP code 63121 is in Saint Louis, located in Saint Louis County, Missouri, within the St. Louis metro area. Its 2020 Census population was 22,909. The estimated median adjusted gross income per tax return is $30,228, and about 1% of filers report $200,000 or more.

2020 Population
22,909
Census ZCTA
County
Saint Louis
FIPS 29189
Median income (est.)
$30,228
IRS SOI 2022
Land Area
7.172 mi²
+ 0.002 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CitySaint Louis, MO
CountySaint Louis County (FIPS 29189)
StateMissouri (FIPS 29)
Metro Area (MSA)St. Louis, MO-IL Metro Area (41180)
Census Region / DivisionMidwest Region · West North Central Division
Coordinates38.70806, -90.30063
Land / Water Area7.172 mi² land · 0.002 mi² water

02Income & Economics

Distribution of the 10,310 individual tax returns filed in 63121 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
43.5%
$25K–$50K
30.8%
$50K–$75K
12.9%
$75K–$100K
5.7%
$100K–$200K
5.8%
$200K+
1.2%
The $200,000+ bracket accounts for 9% of 63121's total adjusted gross income, from 1% of returns — a concentration that drives the gap between the median ($30,228) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 63121's IRS income metrics, 2020–2022.

Median income (2021→2022)
$30,228
▲ 12.4%
Filers earning $200K+
1.2%
▲ 0.1 pt
Total filers
10,310
▼ 1.4%
GET /zipc/v2/zipcodes/63121/soi?year=… $26K 2020 $27K 2021 $30K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 63121 ZCTA.

2000
29,172
 
2010
26,602
▼ -8.8%
2020
22,909
▼ -13.9%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 63121. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 63121

Saint Louis and its immediate neighbors, sorted by distance.

3 mi
GET /zipc/v2/distance

Distance from 63121 to any ZIP

Enter a 5-digit ZIP to calculate the distance.

06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number287140
City AliasesBel Nor, Bel Ridge, Bellerive, Beverly Hills, Cool Valley, Glen Echo Pk, Hillsdale, Normandy, Northwoods, Norwood Court, Pasadena Hills, Pasadena Park, Saint Louis, Uplands Park, Velda Village Hills, Velda City

07Frequently Asked Questions

What county is ZIP code 63121 in?

ZIP code 63121 is in Saint Louis County, Missouri (county FIPS code 29189).

What city is ZIP code 63121?

The primary USPS city for 63121 is Saint Louis, MO.

What metro area (MSA) is 63121 in?

63121 is part of the St. Louis, MO-IL Metro Area (MSA code 41180).

What is the population of ZIP code 63121?

The 2020 Census population of 63121 was 22,909 residents.

What is the median income in ZIP code 63121?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 63121 is about $30,228, with around 1% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.