Zip Code 63031 — Florissant, MO

ZIP Code 63031 is associated with Florissant, MO, in St. Louis County. The listed population estimate is 50,196; estimated density is 1,286.9 people per square mile. Among records with population estimates, it ranks #3 of 61 in St. Louis County and #9 of 1,021 in MO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (38.813920, -90.352240)

Data MetricLocal Statistic
Postal / Zip Code63031
Primary CityFlorissant
State / ProvinceMO
CountySt. Louis
Total Population50,196
Population Density1,286.9 people/sq mi
TimezoneAmerica/Chicago

How 63031 Compares

MetricZIP 63031St. Louis County recordsMO records
Population estimate50,1961,308,579 (sum)6,191,989 (sum)
Population Density1,286.9 /sq mi----
County population rank#3 of 61----
State population rank#9 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 63042Hazelwood2.7 mi17,813
ZIP 63033Florissant4.2 mi43,056
ZIP 63034Florissant4.2 mi18,908
ZIP 63134Saint Louis4.9 mi13,059
ZIP 63044Bridgeton4.9 mi10,324

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 →