What city is 63131 in?

63131 is a Saint Louis, MO mailing address. By land area, 38% lies inside Town and Country, 26% lies inside Des Peres, 21% lies inside Frontenac and 7% lies inside Huntleigh; the rest is outside any Census-defined city or community.

What is the population of 63131?

About 17,935 people (±793), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 18,241.

What is the median household income in 63131?

$225,493 (±$30,989), compared with $70,702 for Missouri as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 63131?

25 USPS carrier routes with 6,482 residential and 932 business mailboxes (7,413 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 63131?

The closest, measured center to center: 63122 (2.8 mi, Kirkwood), 63141 (3 mi, Creve Coeur), 63124 (3.8 mi, Ladue), 63144 (4.9 mi, Brentwood), 63119 (5.2 mi, Webster Groves) and 63132 (5.3 mi, Olivette).

63131 ZIP Code, Saint Louis, MO

63131 is a ZIP code in Saint Louis, Missouri in St. Louis County. It covers 14 square miles of land. The closest ZIP codes are 63122, 63141 and 63124. 17,935 people live here in 6,511 households. At about 1,316 people per square mile it has suburban density, and most homes are owner-occupied (94%). Median household income is $225,493, well above the Missouri median of $70,702; the median age is 46.3, older than most ZIP codes.

Quick facts

Mailing city: Saint Louis, MO
County: St. Louis County
Land area: 14 sq mi
Population: 17,935
Median household income: $225,493
Carrier routes: 25 (6,482 homes)

Key figures

Measure	Value
Residents	17,935
Households	6,511
Median household income	$225,493
Income per person	$124,190
Median age	46.3
Homeowners	93.7%
Median home value	$778,100
Median rent	$1,896
Bachelor's degree or higher	81.6%
Average commute (minutes)	18.8
Households with kids under 18	37.2%
Moved in the past year	9.0%
Below the poverty line	2.1%
Broadband internet	97.5%
Speak a non-English language at home	7.6%

Household income

% of households	Value
<$10K	1.7%
$10–15K	0.4%
$15–25K	1.5%
$25–35K	3.0%
$35–50K	2.7%
$50–75K	4.3%
$75–100K	6.8%
$100–150K	14.0%
$150–200K	11.1%
$200K+	54.5%

Age

% of all residents	Value
<10	10.4%
10–19	16.9%
20–24	3.6%
25–34	4.5%
35–44	12.4%
45–54	15.3%
55–64	14.3%
65–74	12.5%
75+	10.1%

Tenure

% of housing units	Value
Owned, with mortgage	61.0%
Owned outright	31.5%
Rented	6.1%
Vacant	1.4%

Type of building

% of housing units	Value
Detached house	94.1%
Townhome	2.4%
2–4 units	0.2%
5–19 units	0.0%
20+ units	3.3%
Mobile / other	0.0%

Businesses in 63131

1,163 business establishments with 31,648 employees (ZIP Codes Business Patterns 2023).

Health Care and Social Assistance: 219
Retail Trade: 204
Professional, Scientific, and Technical Services: 155
Finance and Insurance: 142
Accommodation and Food Services: 80
Other Services (except Public Administration): 78
Real Estate and Rental and Leasing: 72
Wholesale Trade: 44

EDDM carrier routes

63131 has 25 USPS carrier routes with 6,482 residential and 932 business mailboxes. Open the EDDM route map.

Carrier routes in 63131

63131 has 25 USPS carrier routes (25 city (C)) with 6,482 residential and 932 business mailboxes. Routes range from 15 homes (C023) to 381 homes (C012); the median route has 278 homes. The Census counted 6,511 households in 63131 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	8
250–499	17
500–749	0
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 63131 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route C013 — USPS business mailboxes 118, 177 homes
Route C023 — USPS business mailboxes 105, 15 homes
Route C021 — USPS business mailboxes 103, 261 homes
Route C028 — USPS business mailboxes 78, 112 homes
Route C012 — USPS business mailboxes 77, 381 homes

Select these 5 routes on the route map

Every carrier route in 63131

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C002	City	347	1	$194,694	—	—	—
C003	City	314	15	$159,205	—	—	—
C005	City	294	13	$181,235	—	—	—
C006	City	243	43	$164,539	—	—	—
C007	City	303	1	$200,001+	—	—	—
C008	City	300	2	$186,043	—	—	—
C009	City	242	0	$177,713	—	—	—
C011	City	375	3	$134,437	—	—	—
C012	City	381	77	$200,001+	—	—	—
C013	City	177	118	$200,001+	—	—	—
C014	City	278	37	$181,235	—	—	—
C015	City	290	0	$181,235	—	—	—
C016	City	325	69	$159,205	—	—	—
C017	City	278	1	$200,001+	—	—	—
C018	City	130	68	$182,801	—	—	—
C019	City	202	33	$200,001+	—	—	—
C020	City	291	5	$200,001+	—	—	—
C021	City	261	103	$182,801	—	—	—
C022	City	253	44	$134,437	—	—	—
C023	City	15	105	$164,539	—	—	—
C024	City	304	44	$177,713	—	—	—
C027	City	199	71	$177,713	—	—	—
C028	City	112	78	$177,713	—	—	—
C029	City	273	1	$143,498	—	—	—
C035	City	295	0	$200,001+	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 63131 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

63122 — Kirkwood city, MO (2.8 mi)
63141 — Creve Coeur city, MO (3 mi)
63124 — Ladue city, MO (3.8 mi)
63144 — Brentwood city, MO (4.9 mi)
63119 — Webster Groves city, MO (5.2 mi)
63132 — Olivette city, MO (5.3 mi)
63126 — Crestwood city, MO (5.7 mi)
63088 — Valley Park city, MO (5.8 mi)

Areas that include 63131

Town and Country, MO ZIP codes — 3 ZIP codes
Des Peres, MO ZIP codes — 2 ZIP codes
Frontenac, MO ZIP codes — 1 ZIP code
Crystal Lake Park, MO ZIP codes — 1 ZIP code
Huntleigh, MO ZIP codes — 1 ZIP code
Westwood, MO ZIP codes — 1 ZIP code
Country Life Acres, MO ZIP codes — 1 ZIP code
Saint Louis, MO ZIP codes — 45 ZIP codes
St. Louis County ZIP codes — 46 ZIP codes
Missouri ZIP code data

Where it ranks

Mail every home in 63131

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 63131, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 63131 in?: 63131 is a Saint Louis, MO mailing address. By land area, 38% lies inside Town and Country, 26% lies inside Des Peres, 21% lies inside Frontenac and 7% lies inside Huntleigh; the rest is outside any Census-defined city or community.
What county is 63131 in?: 63131 is in St. Louis County.
What is the population of 63131?: About 17,935 people (±793), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 18,241.
What is the median household income in 63131?: $225,493 (±$30,989), compared with $70,702 for Missouri as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 63131?: 25 USPS carrier routes with 6,482 residential and 932 business mailboxes (7,413 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 63131?: The closest, measured center to center: 63122 (2.8 mi, Kirkwood), 63141 (3 mi, Creve Coeur), 63124 (3.8 mi, Ladue), 63144 (4.9 mi, Brentwood), 63119 (5.2 mi, Webster Groves) and 63132 (5.3 mi, Olivette).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.