📞Area Code 657 — California
US area code 657 serves California. See the full profile: state, neighboring area codes, and lookup API.
Key facts
Area code657
State / territoryCalifornia
Other codes in state209, 213, 279, 310, 323, 341, 408, 415
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=657 HTTP/1.1
Host: agenttools-hub.vercel.app
→ 402 (x402 payment required)
→ 200 {"tool": "databases/area-codes", "result": { "value": 657, "answer": "Area code 657 — California" }}Frequently asked questions
Area code — Area Code 657 — California?
Area Code 657 — California: Area code — 657.
State / territory — Area Code 657 — California?
Area Code 657 — California: State / territory — California.
Other codes in state — Area Code 657 — California?
Area Code 657 — California: Other codes in state — 209, 213, 279, 310, 323, 341, 408, 415.
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.