往美国各地拨打电话的国际区号是多少？

400 易识码（特服号）

401 Rhode Island

402 Nebraska

403 Alberta

404 Georgia

405 Oklahoma

406 Montana

407 Florida

408 California

409 Texas

410 Maryland

411 Local Directory Assistance

412 Pennsylvania

413 Massachusetts

414 Wisconsin

415 California

416 Ontario

417 Missouri

418 Quebec

419 Ohio

420 Geographic Relief Code

421 Geographic Relief Code

422 易识码（特服号）

423 Tennessee

424 California

425 Washington

426 Geographic Relief Code

427 General Purpose Code

428 General Purpose Code

429 General Purpose Code

430 Geographic Relief Code

431 Geographic Relief Code

432 Geographic Relief Code

433 易识码（特服号）

434 General Purpose Code

435 Utah

436 Geographic Relief Code

437 Geographic Relief Code

438 General Purpose Code

439 Geographic Relief Code

440 Ohio

441 Bermuda

442 California

443 Maryland

444 易识码（特服号）

445 Geographic Relief Code

446 Geographic Relief Code

447 Geographic Relief Code

448 General Purpose Code

449 Geographic Relief Code

450 Quebec

451 General Purpose Code

452 General Purpose Code

453 General Purpose Code

454 General Purpose Code

455 易识码（特服号）

456 Inbound International

457 Geographic Relief Code

458 Geographic Relief Code

459 Geographic Relief Code

460 Geographic Relief Code

461 Geographic Relief Code

462 General Purpose Code

463 Geographic Relief Code

464 Illinois

465 Geographic Relief Code

466 易识码（特服号）

467 General Purpose Code

468 Geographic Relief Code

469 Texas

470 Geographic Relief Code

471 General Purpose Code

472 Geographic Relief Code

473 Grenada

474 Geographic Relief Code

475 Geographic Relief Code

476 General Purpose Code

477 易识码（特服号）

478 Geographic Relief Code

479 Geographic Relief Code

480 Arizona

481 General Purpose Code

482 Geographic Relief Code

483 Geographic Relief Code

484 Pennsylvania

485 General Purpose Code

486 Geographic Relief Code

487 General Purpose Code

488 易识码（特服号）

489 General Purpose Code

490 扩展码

491 扩展码

492 扩展码

493 扩展码

494 扩展码

495 扩展码

496 扩展码

497 扩展码

498 扩展码

499 扩展码