How to Find Zip Codes and Area Codes Online

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Zip codes are numerical codes used to facilitate mail delivery, and area codes are used for specifying a geographical region when calling a phone number. Rather than flipping through a large, unwieldy telephone book, you can find and verify zip codes and area codes on the web quite easily.

How to Find a Zip Code

Screenshot of the USPS zip code finder
Jon Fisher

USPS Zip Code Lookup: If you have an address or partial address, you can look up the zip code through the postal service's website. You can also search by city or state, or find all cities that are part of a particular zip code.

The International Post Codes site, maintained by Columbia University: Here you can find an extensive index of domestic as well as international postal codes, in addition to mailing acronyms, policies, and best practices.

You can also use various search engines to find zip codes:

Screenshot of Google's zip code finder
Jon Fisher

Google: Type a partial address into Google and you'll see a map of the location with the zip code included; you can even type something like South Laurel MD zip code to see all of them for that area. You can also enter a zip code to see the geographic location it belongs to as well as a map and other related web results, such as cities that use that zip code.

Screenshot of zip code information found in DuckDuckGo
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DuckDuckGo: Type in a zip code and DuckDuckGo returns a map, the location of the zip code, weather, real estate, and other pertinent web results.

Screenshot of the Bing zip code finder
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Bing: A zip code lookup at Bing brings back what city/locale it pertains to, maps, and local attractions, such as grocery stores, hotels, and movie theaters. If you type a partial address, Bing completes it for you and reveals the zip code.

How to Find an Area Code

Much like with a zip code, you can use a search engine to find an area code by searching for the city. To do the reverse and figure out what part of the country an area code is related to, just enter the area code into the search engine.

Screenshot of an area code search on Google
Jon Fisher

Google: To find an area code with Google, type the name of the city and state you're looking for, followed by the words area code; you'll usually find what you need. For international listings, search for a phrase such as Kenya calling code, and you'll receive an informative answer with the numbers you'll need to make a call into that nation.

Screenshot showing how to search for area codes with Bing
Jon Fisher

Bing: Enter the city and state and you'll more than likely see Google-like results that show you the area code at the very top of the results. The same is true for international calling codes. Searching on Bing is easier when you know certain extra tips.

Screenshot of a Wolfram Alpha area code search
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Wolfram Alpha: Another way to find an area code online is with Wolfram Alpha, which bills itself as "Computational Intelligence." This data-based search engine doesn't display results like the others mentioned on this page, but with a little digging, you can find some unique information about cities and states that you might not find on another search engine.

Screenshot of the Yahoo area code finder tool
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Yahoo: Using Yahoo to find an area code is much like using Google; just enter the city and state name followed by area code, and you'll get an instant result. Finding international codes isn't as easy with Yahoo as it is with Google, but you can, of course, still use Yahoo to find other websites that can give you that information.

Quite a few sites specialize in finding area codes that a simple search engine query might not reveal. You can use these free resources to find nearly any area code and/or country calling code in the world:

  • Area Codes: Features area codes from mostly the United States, though other countries are scattered through here as well.
  • BT Phonebook: Use this site to find area codes in the U.K.
  • Country Codes: This site asks you what country you're calling from and to in order to assign the correct country code, area code, or both.
  • LincMad: A zip code map that offers a visual representation of area codes in the United States and Canada.