📞Area Code 331 — Illinois
US area code 331 serves Illinois. See the full profile: state, neighboring area codes, and lookup API.
Key facts
Area code331
State / territoryIllinois
Other codes in state217, 224, 309, 312, 447, 464, 618, 630
Machine API (x402)
$0.001 / callThe same query is available to AI agents as a paid JSON endpoint — pre-configured for this subject:
GET /api/v1/databases/area-codes?code=331 HTTP/1.1
Host: agenttools-hub.vercel.app
→ 402 (x402 payment required)
→ 200 {"tool": "databases/area-codes", "result": { "value": 331, "answer": "Area code 331 — Illinois" }}Frequently asked questions
Area code — Area Code 331 — Illinois?
Area Code 331 — Illinois: Area code — 331.
State / territory — Area Code 331 — Illinois?
Area Code 331 — Illinois: State / territory — Illinois.
Other codes in state — Area Code 331 — Illinois?
Area Code 331 — Illinois: Other codes in state — 217, 224, 309, 312, 447, 464, 618, 630.
Do overlay codes appear separately?
Yes — overlay codes (two codes serving the same region) are listed as distinct entries, each mapped to its state.
Does this cover Canada and the Caribbean?
The dataset focuses on US area codes. Canadian and Caribbean NANP codes are planned for a future expansion.