Find the last 4 digits (ZIP+4) for an address in 45040

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ZIP Code 45040 – Mason, OH

Mason, Ohio · Warren County · Eastern time

ZIP code45040
CityMason
StateOhio
CountyWarren County
Population59,518
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area28.45 sq mi
Center (lat, long)39.3508, -84.3132

Area codes in this area

283513

These are the area codes that most often serve ZIP 45040 (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

45034 Kings Mills · 3.6 mi45039 Maineville · 4.4 mi45071 West Chester · 5.2 mi45249 Cincinnati · 5.3 mi45069 West Chester · 5.3 mi45065 South Lebanon · 5.5 mi45241 Cincinnati · 6.9 mi45050 Monroe · 7 mi

About ZIP 45040

ZIP code 45040 is assigned to Mason, Ohio. It lies in Warren County. Its Census area covers about 28.45 square miles of land. The closest neighboring ZIP is 45034 (Kings Mills), about 3.6 miles away.

Every address in 45040 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