US Area Code Map: Interactive Telephone Numbering Plan Explorer

Explore every telephone area code boundary across the United States on this interactive map. All 356 Numbering Plan Area (NPA) polygons are colour-coded by state, so you can instantly see how area codes carve up each state, where overlay codes share the same geography, and how boundaries have evolved to meet growing demand. Search by code, click any region for details, or share a direct link to any area code.

How to Use This Map

Browsing Area Codes

The map loads all 356 US area code polygons at once, each coloured by state. Hover over any polygon to see its three-digit code in a tooltip. Click a polygon to highlight it and display the area code, state or territory, and coverage area in square miles in the bar below the map.

Searching by Code

Type any three-digit area code into the search box and press Go or hit Enter. The map will zoom directly to that region and select it. This is the fastest way to locate a specific code — useful when you receive an unfamiliar number and want to know where it originates.

Other Controls

• Basemap buttons — switch between Light (default, best for reading boundaries), Streets, and Satellite imagery
• Copy link — generates a shareable URL that preserves your current map view and selected area code

About US Telephone Area Codes

The US telephone area code system is governed by the North American Numbering Plan (NANP), administered by the North American Numbering Plan Administrator (NANPA) under oversight from the Federal Communications Commission (FCC). The NANP was introduced in 1947 and originally divided the US, Canada, and parts of the Caribbean into geographic zones, each identified by a three-digit Numbering Plan Area code — the familiar area code you dial before a local number.

Originally there were 86 area codes across North America. Rapid growth in telephone demand — driven first by fax machines and pagers, then by mobile phones and internet dial-up — exhausted many of these original codes. The response has been twofold: geographic splits, where an existing area is divided and the new portion receives a new code, and overlays, where a second code is introduced to cover the same geographic area as an existing one.

Today the US has over 300 active area codes, with more planned. High-density states like California, Texas, New York, and Florida each have many codes; rural states may still use a single code for the entire state.

Geographic Splits vs Overlay Codes

When an area code runs low on available numbers, regulators have two options:

• Geographic split — the existing coverage area is divided into two regions. One region keeps the original code; the other receives a new one. This can require residents in the new region to update printed materials, signage, and systems with a new code.
• Overlay — a new code is introduced covering the same geographic area as the existing one. Both codes remain valid simultaneously. Ten-digit dialling (area code + number) becomes mandatory within the overlay zone. Overlays are less disruptive but can cause confusion as the same city or neighbourhood may have multiple valid area codes.

On this map, overlay areas will appear as separate polygons with different codes sharing similar or identical boundaries.

Frequently Asked Questions

How many area codes does the US have?

As of the 2023 dataset used in this map, there are 356 active area code boundaries in the United States, including territories such as Puerto Rico (787, 939), the US Virgin Islands (340), Guam (671), and the Northern Mariana Islands (670).

Can I look up who owns a phone number by area code?

Area codes identify a geographic region, not a specific carrier or owner. Mobile number portability (introduced in 2003) means a phone number can be moved between carriers and even between geographic regions, so a number with a New York area code may now be used anywhere in the country. For carrier lookup, services such as the NANPA website or third-party reverse-lookup tools provide more detail.

Why do some states have only one area code?

States with lower population density — such as Wyoming (307), Montana (406), North Dakota (701), and South Dakota (605) — have not exhausted their original single area code and retain full-state coverage. California, by contrast, has more than 30 active area codes.

What is the 988 code?

988 is a nationwide overlay code designated as the Suicide and Crisis Lifeline — it is not a geographic area code in the traditional sense and does not appear as a geographic polygon in this dataset.

How current is the boundary data?

The polygon boundaries in this map are sourced from TomTom data (June 2023), published by Esri as part of their open data programme. Area code boundaries can change when splits or overlays are approved by the FCC; check the NANPA website for the latest assignments.

Data Sources

Area code boundary polygons are sourced from the USA Telephone Area Code Boundaries feature service, published by Esri via their open data platform, based on TomTom data (June 2023). The service is publicly accessible via the ArcGIS REST API with no authentication required. Each polygon represents a single Numbering Plan Area as defined by the North American Numbering Plan Administrator.

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