Zip Code 63033 — Florissant, MO

ZIP Code 63033 is associated with Florissant, MO, in St. Louis County. The listed population estimate is 43,056; estimated density is 1,366.4 people per square mile. Among records with population estimates, it ranks #7 of 61 in St. Louis County and #19 of 1,021 in MO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (38.795800, -90.277860)

Data MetricLocal Statistic
Postal / Zip Code63033
Primary CityFlorissant
State / ProvinceMO
CountySt. Louis
Total Population43,056
Population Density1,366.4 people/sq mi
TimezoneAmerica/Chicago

How 63033 Compares

MetricZIP 63033St. Louis County recordsMO records
Population estimate43,0561,308,579 (sum)6,191,989 (sum)
Population Density1,366.4 /sq mi----
County population rank#7 of 61----
State population rank#19 of 1,021----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in MO

ZIP CodeCityDistancePopulation estimate
ZIP 63135Saint Louis3.4 mi18,381
ZIP 63034Florissant3.6 mi18,908
ZIP 63136Saint Louis3.7 mi40,929
ZIP 63031Florissant4.2 mi50,196
ZIP 63140Saint Louis4.6 mi316

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →