840 Area Code - Location, Time, Map, Cities and Census Data - ZIP-Codes.com
https://www.zip-codes.com/area-code/area-code-840.asp
webMar 1, 2024 · Important 840 Area Code Information. Area Code 840 is located in California. It covers 19 cities, including San Bernardino, Fontana, Ontario, Rancho Cucamonga, and Pomona. It also covers 3 counties, including San Bernardino County, Los Angeles County, Riverside County. A full list of covered cities and counties is below including its prefix and ...
DA: 29 PA: 80 MOZ Rank: 97 Up or Down: Up