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Zip Code 40203 — Louisville, KY

ZIP Code 40203 is associated with Louisville, KY, in Jefferson County. The listed population estimate is 17,742; estimated density is 2,366.0 people per square mile. Among records with population estimates, it ranks #21 of 36 in Jefferson County and #89 of 765 in KY.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (38.247220, -85.765000)

Data MetricLocal Statistic
Postal / Zip Code40203
Primary CityLouisville
State / ProvinceKY
CountyJefferson
Total Population17,742
Population Density2,366.0 people/sq mi
TimezoneAmerica/Kentucky/Louisville

How 40203 Compares

MetricZIP 40203Jefferson County recordsKY records
Population estimate17,742788,809 (sum)4,542,460 (sum)
Population Density2,366.0 /sq mi----
County population rank#21 of 36----
State population rank#89 of 765----

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 KY

ZIP CodeCityDistancePopulation estimate
ZIP 40202Louisville0.8 mi7,261
ZIP 40210Louisville1.6 mi13,518
ZIP 40208Louisville2.0 mi15,605
ZIP 40204Louisville2.5 mi14,034
ZIP 40212Louisville2.5 mi14,661

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 →