🇺🇸 United States ZIP Code

STANDARD

63021

Ballwin

ZIP Code 63021 is a standard zip code serving Ballwin, Ballwin, Missouri (MO), in St. Louis County, United States. It has an estimated population of 56,261 with a median household income of $82,449. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Missouri (MO)
County: St. Louis
City: Ballwin
Timezone: America/Chicago

Coordinates

Latitude: 38.577000
Longitude: -90.525500

Geographic Details

Land Area: 21.80 mi²
Water Area: 0.40 mi²
Population Density: 2580.0 people per mi² (85th percentile)
Bounding Box: 38.597177°N, 38.532153°S, -90.461787°E, -90.612581°W

With 56,261 residents spread across 21.80 square miles, this area has a population density of 2580.0 people per square mile.

Demographics

56,261

Population

95th percentile

$82,449

Median Income

90th percentile

$226,000

Median Home Value

75th percentile

21.80 mi²

Land Area

The median household income in 63021 is $82,449, and the median home value is $226,000. This places the area in the top 25% nationally for household income.

Housing

22,553

Total Units

21,684

Occupied Units

96.1%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Ballwin, MO.

63011

Ballwin

63022

Ballwin

63024

Ballwin

Similar ZIP Codes in Missouri

ZIP codes with similar median household income in Missouri.

64158

Kansas City

$73,125

64034

Greenwood

$77,500

64098

Weston

$73,142

63025

Eureka

$86,412

64086

Lees Summit

$78,203

65279

Rocheport

$79,659

64079

Platte City

$81,778

64152

Kansas City

$79,368

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.