Find the last 4 digits (ZIP+4) for an address in 63021

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ZIP Code 63021 – Ballwin, MO

Ballwin, Missouri · St. Louis County · Central time

ZIP code63021
CityBallwin
StateMissouri
CountySt. Louis County
Population55,666
Time zoneCentral · local time
ZIP typeStandard (has a Census ZCTA area)
Land area21.82 sq mi
Center (lat, long)38.5698, -90.5457

Area codes in this area

636

These are the area codes that most often serve ZIP 63021 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

63022 Ballwin · 1.7 mi63024 Ballwin · 1.7 mi63011 Ballwin · 2.5 mi63088 Valley Park · 2.8 mi63040 Grover · 4.8 mi63017 Chesterfield · 6 mi63049 High Ridge · 6.4 mi63131 Saint Louis · 6.6 mi

About ZIP 63021

ZIP code 63021 is assigned to Ballwin, Missouri. It lies in St. Louis County. Its Census area covers about 21.82 square miles of land. The closest neighboring ZIP is 63022 (Ballwin), about 1.7 miles away.

Every address in 63021 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources