Ziopcodefinder.com is a free, USPS-powered ZIP code lookup tool. Enter any US street address, city, or postal code to instantly find the matching ZIP code, ZIP+4 extension, county, latitude, and longitude. Browse our state directory for city-by-city ZIP code pages across all 50 states, or read in-depth postal logistics guides on the ZIP code blog. We cover address standardization, area code lookup, ZIP+4 codes, shipping rate optimization, USPS delivery routes, and how ZIP codes affect insurance, taxes, and demographics. No registration is required and the tool works on mobile, tablet, and desktop.