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Zip Code 40456 — Mount Vernon, KY

40456 is a ZIP Code associated with Mount Vernon, KY, located within Rockcastle. 40456 ranks #1 out of 4 ZIP codes in Rockcastle County by population (and #145 out of 780 in KY). The area supports an estimated population of 8,370 residents across Data Pending housing units, with a population density of 19.9 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (37.353800, -84.320990)

Data MetricLocal Statistic
Postal / Zip Code40456
Primary CityMount Vernon
State / ProvinceKY
CountyRockcastle
Total Population8,370
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density19.9 people/sq mi
TimezoneAmerica/New_York

How 40456 Compares

MetricZIP 40456Rockcastle CountyKY State Average
Population8,37013,928 (Total)4,542,460 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density19.9 /sq mi----
County Pop Rank#1 of 4----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 40460Orlando5.2 mi1,358N/A
Zip 40409Brodhead6.2 mi3,445N/A
Zip 40445Livingston6.7 mi755N/A
Zip 40419Crab Orchard11.4 mi5,250N/A
Zip 40729East Bernstadt12.2 mi5,799N/A

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 →