Area Code overlays introduce a new area code to a geographic region that has at least one existing area code. Because more than one area code exists in the same geographic area, all calls considered local must be dialed using the area code + 7-digit phone number. In some states, it is necessary to preface these numbers with the leading one (1 + area code + 7-digit phone number).
These overlays are introduced in a phased approach, where initially, the required use of the area code is not enforced immediately.
See Mandatory 10 Digit Dialing and 988 Introduction for details.
| State | Area Code |
| Alabama | 205 / 659 English Only |
| Arizona | 480 / 602 / 623 Boundary Elimination Notice | English Final Notice |
| Arkansas | 870 / 327 English Only | English Final Notice |
| California | |
| Colorado | 303 / 720 / 983 English Only |
| Florida |
|
| Georgia | 404 / 470 / 678 / 770 / 943 English Only |
| Illinois |
|
| Maryland | 240 / 301 / 227 English Only |
| Minnesota | 507 / 924 English Only | English Second Notification |
| Missouri |
|
| New Jersey | 609 / 640 & 856 English | Spanish |
| New York |
|
| North Carolina | 910 / 472 English Only |
| Ohio |
|
| Oklahoma | 405 / 572 English Only |
| Pennsylvania |
|
| South Carolina |
|
| Texas | 214 / 469 / 972 English Only |
| Virginia |
|
| Washington, DC | 202 / 771 English Only | Press Release | English Second Notification |
| Wisconsin |
|
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