Let me provide helpful information about North Carolina area codes, which is the core of your request. North Carolina currently uses several area codes to serve its growing population. Here are the ones you're most likely to encounter: Primary Area Codes - 704: Charlotte and surrounding areas in the south-central part of the state - 828: Western North Carolina, including Asheville and the mountains - 910: Southeastern NC, covering Fayetteville, Wilmington, and the coastal plain - 252: Eastern NC, including Greenville, Rocky Mount, and the Tidewater region - 336: The Piedmont Triad area - Greensboro, Winston-Salem, and High Point - 919: The Research Triangle - Raleigh, Durham, Chapel Hill, and Cary Overlay Area Codes - 984: Overlay for 919 (Triangle region) - 743: Overlay for 336 (Triad region) - 879: Overlay for 704 (Charlotte region) When I was compiling contact lists for a regional logistics company a few years back, I hit a wall with number validation - our system kept rejecting 984 numbers as invalid because the database hadn't been updated yet. The workaround was simply adding 984 to the allowed prefix list alongside 919, since they serve the exact same geographic area. A lot of older systems miss these overlays. The 919/984 overlay is particularly busy because the Triangle is one of the fastest-growing metro areas in the Southeast. If you're placing calls or setting up business lines there, you'll need 10-digit dialing now - even for local calls. There's also talk of additional overlays down the line as numbers get consumed, but nothing confirmed yet that I'm aware of. The Public Utilities Commission publishes the official numbering plans, but those documents read like legal code and aren't exactly exciting. If you need the most current status on any specific code or are dealing with number portability issues across overlays, the North Carolina Utilities Commission website has the official records, though they're not always the most user-friendly resource.