US Area Codes By State: Complete Reference

Area codes are three-digit numbers that identify geographic regions for telephone routing within the North American Numbering Plan. Each state has one or more area codes depending on its population and telephone density. California leads the nation with over 30 area codes, reflecting its large population and historical role as a center of telecommunications growth. Texas has approximately 25 area codes, Florida has about 18, and New York has roughly 15. Even smaller states like Wyoming, Montana, and Alaska have just one area code each. The uneven distribution means that generating realistic phone numbers requires knowing exactly which codes are valid for each state. Having a complete reference of area codes organized by state is invaluable for developers who need to validate phone number inputs or generate test data that passes geographic consistency checks in their applications.

Major cities typically have multiple area codes. New York City uses 212 (Manhattan), 718 (Brooklyn, Queens, Staten Island, Bronx), 646 and 917 (overlay codes), and 347 and 929 (additional overlays). Los Angeles uses 213 (central), 310 (west side), 323 (east and south), 818 (San Fernando Valley), and 424 (overlay). Chicago uses 312 (downtown) and 773 (rest of the city). Dallas uses 214 and 469. Houston uses 713 and 832. Understanding these assignments is important for generating phone numbers that appear authentic. Our state-specific pages list every area code assigned to each state for easy reference during development and testing.

When generating test data, using realistic area codes makes phone numbers look genuine and helps validate application logic that depends on geographic consistency. If your application detects a mismatch between a user's stated city and their phone number's area code, a random generator that assigns arbitrary codes will produce numbers that fail this check. Our phone number generator solves this by matching area codes to the correct state. For California addresses, the generator uses codes like 213, 310, 415, 510, 619, 626, 650, 714, 760, 805, 818, 858, 909, 916, 925, 949, and 951. For Texas addresses it uses 214, 469, 512, 713, 832, 817, 806, 830, 903, 915, and 936, among others.

For comprehensive test profiles that include both an address and a phone number with matching area codes, our random person generator is the ideal tool. It produces complete identities where the phone area code, the address state, and the city name are all internally consistent. This level of detail is crucial for testing applications that perform location-based verification, fraud detection, or regional customization based on user location. You can also use our test address generator and other generator tools to build thorough test suites that cover every major area code region in the country. Whether you are validating phone number inputs, testing location-based features, or populating a demo database with realistic user records, having correct area codes ensures your test data passes every geographic consistency check your application performs. With area codes properly matched to states and cities, your test phone numbers will behave authentically in any location-aware feature you build.