AllAreaCodes.com
Area code lookup for all US cities and an area codes locator to find which city an area code belongs to.
United States Zip Codes
United States Zip Codes provides a free zip code map and list of zip codes by state. Find zip codes by address, zip codes by city, or zip codes by state and compare shipping rates for USPS, UPS, and FedEx.
USPS - ZIP Code Lookup
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