There are 43 zip codes in St. Louis County, Missouri. The most populated is 63021, located in Ballwin. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
63021Ballwin55,944
63129Saint Louis51,893
63031Florissant50,568
63123Saint Louis50,347
63017Chesterfield42,686
63136Saint Louis42,385
63122Saint Louis41,416
63033Florissant41,037
63011Ballwin36,515
63119Saint Louis34,732
63114Saint Louis34,341
63125Saint Louis32,750
63146Saint Louis31,348
63128Saint Louis30,168
63130Saint Louis28,978
63121Saint Louis24,126
63043Maryland Heights22,123
63141Saint Louis20,781
63137Saint Louis20,390
63135Saint Louis19,764
63005Chesterfield19,734
63034Florissant19,031
63105Saint Louis19,003
63138Saint Louis18,602
63131Saint Louis18,531
63042Hazelwood18,143
63025Eureka17,708
63074Saint Ann15,888
63126Saint Louis15,201
63134Saint Louis14,023
63132Saint Louis13,995
63124Saint Louis10,997
63044Bridgeton10,821
63117Saint Louis9,691
63143Saint Louis9,097
63144Saint Louis9,027
63040Wildwood8,662
63088Valley Park8,473
63038Wildwood7,153
63133Saint Louis6,763
63127Saint Louis5,235
63140Saint Louis291
63045Earth City0
showing: 43 rows

St. Louis County, Missouri Zip Codes by Population (2024)