Area Code Lookup provides an area code look up that helps you find the area code for a particular city. If you know the full phone number, try our reverse phone lookup. If you already know the area code but need more info, try the area code locator. Information about the telephone area codes include the cities served, time zones, info about mergers, and info about new area codes. The area code lookup lets you search area codes from all of the United States. Just start to enter the city into the area code look up above to see suggestions for cities that you may be interested in. Looking up an area code may be needed when traveling, calling businesses, or calling friends.