ZIP Codes are delivery routes
The ZIP records use GeoNames place names and approximate center points. A result is not address validation, and nearby ZIPs are distance estimates between those points.
Why ZIP Codes and ZCTAs differ
Private, offline-ready U.S. reference
ZIP Code & Area Code Lookup
Enter one number or place. The tool recognizes ZIP Codes, Area Codes, cities, and states automatically.
Version 1.1.0One search box, grouped city results, related Area Codes, and nearby ZIPs.
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One search box for U.S. codes.
Enter a ZIP Code, Area Code, city, or state. The tool recognizes what you typed.
Your search stays on this deviceNo search term, IP location, or GPS location is sent to a lookup service.
Works after the first downloadThe reference files are stored in this browser for offline use.
Reference, not verificationUse USPS or your phone carrier when an official answer matters.
About the data
Useful context, without pretending the boundaries are simpler than they are.
Area Codes overlap
One place can use several Area Codes, and one Area Code can cover many communities. Coverage examples come from phone-prefix geography; assignment status comes from NANPA.
NANPA Area Code reportsCaller ID can be spoofed
A familiar Area Code does not prove a call is safe. This tool deliberately does not label individual Area Codes as “safe” or “scam.”
FTC phone-scam guidancePrivacy and accuracy
Does this tool use my location?
No. It does not request GPS access or use an IP location service. Enter a ZIP Code or city yourself, and the search runs against data saved in your browser.
How accurate are nearby ZIP Codes?
They are estimated from approximate ZIP center points, not street addresses or official ZIP boundaries. Use the result as a quick reference, not address verification.
Data credits
ZIP place and coordinate data © GeoNames under CC BY 4.0. Area Code assignments are from NANPA public reports. Area Code city examples and time zones use Google libphonenumber metadata under Apache License 2.0.