Find the last 4 digits (ZIP+4) for an address in 40121

ZIP 40121, Fort Knox, KY is filled in. Just type the street address.

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ZIP Code 40121 – Fort Knox, KY

Fort Knox, Kentucky · Hardin County · Eastern time

ZIP code40121
CityFort Knox
StateKentucky
CountyHardin CountyMeade County
Population8,836
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area35.22 sq mi
Center (lat, long)37.9269, -85.9598

Area codes in this area

270364

These are the area codes that most often serve ZIP 40121 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

40155 Muldraugh · 2.4 mi40122 Fort Knox · 2.5 mi40177 West Point · 5.6 mi40160 Radcliff · 8 mi40117 Ekron · 9.2 mi40175 Vine Grove · 10.3 mi47135 Laconia · 10.5 mi40272 Louisville · 12 mi

About ZIP 40121

ZIP code 40121 is assigned to Fort Knox, Kentucky. It crosses 2 counties; most of its land is in Hardin County. Its Census area covers about 35.22 square miles of land. The closest neighboring ZIP is 40155 (Muldraugh), about 2.4 miles away.

Every address in 40121 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources