Area Codes in the USA

Area Codes in the USA are three-digit telephone codes used in the North American Numbering Plan (NANP) to organize and route phone calls. Introduced in 1947, area codes identify specific geographic regions, cities, or states, ensuring that phone numbers are unique and properly connected across the country. Today, area codes are an essential part of dialing phone numbers in the United States.

A standard U.S. phone number consists of 10 digits: a 3-digit area code, followed by a 7-digit local number. For example, in the number (212) 555-1234, the 212 is the area code, identifying New York City. Newer overlays (e.g., 646, 917 for NYC) are often added in highly populated regions when existing codes run out of numbers.

Area codes are organized geographically, though with overlays, multiple codes may serve the same city. For instance, Los Angeles uses several area codes including 213, 310, 424, and 818. Meanwhile, rural states like Wyoming have fewer area codes (e.g., 307 for the entire state).

On our website, you can search and explore area codes across all U.S. states and territories, including city-wise, state-wise, and overlay code listings. Whether you’re looking for the area code for Los Angeles, Houston, Chicago, or a small town, our tools provide quick and accurate results.

Area codes are also useful for location lookup, business directories, phone number validation, and telecommunications routing. Companies, marketers, and developers rely on area code data to identify locations and organize customer service systems.

At area-code.us, we provide up-to-date and comprehensive area code information for the entire United States. Use our powerful lookup tools to find area codes by city, state, or phone number – fast, reliable, and free.