Quick Answer

A ZIP code lookup returns the city, state, county, and time zone for any 5-digit US ZIP code — free and instant. The US has 41,000+ active ZIP codes assigned by USPS (United States Postal Service), introduced in 1963 under the Zone Improvement Plan. Enter any ZIP code above to look it up.

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Popular ZIP Codes

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How ZIP Codes Work

ZIP codes (Zone Improvement Plan codes) are 5-digit postal codes used by the US Postal Service (USPS) to sort and deliver mail efficiently. Introduced in 1963, they allow USPS to identify the specific post office or delivery area for each address.

The first digit of a ZIP code represents a broad geographic region of the US (0 = Northeast, 9 = Far West). Subsequent digits narrow the location down to a state, sectional center facility, and finally a specific delivery area or post office.

ZIP+4 codes add 4 more digits after a hyphen to identify a more specific location, such as a city block, building, or P.O. Box group.

ZIP Code vs. Area Code

ZIP codes and area codes are different systems. ZIP codes are used for mail delivery and are assigned by USPS. Area codes are part of the phone number system and are assigned by NANPA. A single ZIP code area can contain multiple area codes, and a single area code covers many ZIP codes.

Frequently Asked Questions

What is a ZIP code lookup?
A ZIP code lookup takes a 5-digit US ZIP code and returns the associated city, state, county, and time zone. ZIP codes are assigned by USPS and there are approximately 41,000+ active ZIP codes in the US. Enter any ZIP above for an instant free result.
What city is ZIP code 90210?
ZIP code 90210 is Beverly Hills, California, Los Angeles County, Pacific Time Zone. It is one of the most famous ZIP codes in the US.
What city is ZIP code 10001?
ZIP code 10001 is in New York City (Manhattan), New York, New York County, Eastern Time Zone. It covers the Chelsea and Hudson Yards neighborhoods.
How many ZIP codes are there in the US?
There are approximately 41,000+ active ZIP codes in the United States. USPS manages the ZIP code system and regularly adds, removes, and modifies codes as population patterns change. ZIP codes were introduced in 1963.
What does ZIP stand for?
ZIP stands for Zone Improvement Plan. The system was introduced by USPS in 1963 to improve mail sorting efficiency. The name also evokes speed — mail "zipping" through the postal network.
What is USPS ZIP code lookup?
The USPS ZIP code lookup (available at usps.com) finds ZIP codes by street address and returns the exact ZIP+4 code. Our tool at mycodearea.com does the reverse — enter a ZIP code to find the city, state, county, and time zone it covers.
What is the difference between a ZIP code and ZIP+4?
A standard ZIP code is 5 digits (e.g., 90210). A ZIP+4 code adds 4 more digits (e.g., 90210-3456) to identify a specific block, building, or P.O. box for precise mail routing. Standard 5-digit ZIPs are used for general addressing.
How do I find the ZIP code for an address?
To find a ZIP code: (1) Use the USPS ZIP Code Lookup at usps.com/zip4 — enter the full address to get the ZIP+4 code, or (2) Search the city name on our tool above to find the ZIP codes that serve it.
Can a ZIP code cross state lines?
Yes, a small number of ZIP codes cross state lines — this occurs in rural border areas where a single post office serves communities in two states. It is uncommon but documented in several regions of the US.
How do ZIP codes relate to area codes?
ZIP codes (5 digits) identify postal delivery areas managed by USPS. Area codes (3 digits) identify telephone regions managed by NANPA. They are separate systems — one ZIP code can contain multiple area codes, and one area code can span many ZIP codes. Browse all US area codes →
What ZIP codes are in New York City?
New York City has hundreds of ZIP codes. Key ones: 10001 (Chelsea/Hudson Yards), 10007 (Lower Manhattan), 10014 (Greenwich Village), 10021 (Upper East Side), 10036 (Times Square), 11201 (Brooklyn Heights), 11368 (Jackson Heights, Queens). Look up 10001 →
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