In 1947, the American Telephone and Telegraph Company designated the entire state of Nebraska as a single numbering plan area (NPA) with area code 402. The state was divided into two NPAs in 1954. In 2011, the eastern half received a second area code in creation of an overlay complex.
| Area code | Year created |
Parent NPA |
Overlay | Numbering plan area |
|---|---|---|---|---|
| 402 | 1947 | – | 402/531 | Eastern Nebraska, including Lincoln and Omaha |
| 531 | 2011 | 402 | ||
| 308 | 1954 | 402 | – | Western Nebraska, including Grand Island and Kearney |
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