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Zip Code 63090 — Washington, MO

ZIP Code 63090 is associated with Washington, MO, in Franklin County. The listed population estimate is 23,258; estimated density is 110.1 people per square mile. Among records with population estimates, it ranks #1 of 20 in Franklin County and #75 of 1,021 in MO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (38.531760, -91.050470)

Data MetricLocal Statistic
Postal / Zip Code63090
Primary CityWashington
State / ProvinceMO
CountyFranklin
Total Population23,258
Population Density110.1 people/sq mi
TimezoneAmerica/Chicago

How 63090 Compares

MetricZIP 63090Franklin County recordsMO records
Population estimate23,258114,137 (sum)6,191,989 (sum)
Population Density110.1 /sq mi----
County population rank#1 of 20----
State population rank#75 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 63084Union8.1 mi20,708
ZIP 63357Marthasville8.9 mi6,536
ZIP 63013Beaufort9.6 mi1,136
ZIP 63332Augusta9.8 mi1,651
ZIP 63089Villa Ridge10.4 mi5,662

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 →