A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 391, MEDICINE PARK, OK 73557-0391
PO BOX 392, MEDICINE PARK, OK 73557-0392
PO BOX 393, MEDICINE PARK, OK 73557-0393
PO BOX 394, MEDICINE PARK, OK 73557-0394
PO BOX 395, MEDICINE PARK, OK 73557-0395
PO BOX 396, MEDICINE PARK, OK 73557-0396
PO BOX 397, MEDICINE PARK, OK 73557-0397
PO BOX 398, MEDICINE PARK, OK 73557-0398
PO BOX 399, MEDICINE PARK, OK 73557-0399
PO BOX 400, MEDICINE PARK, OK 73557-0400
PO BOX 401, MEDICINE PARK, OK 73557-0401
PO BOX 402, MEDICINE PARK, OK 73557-0402
PO BOX 403, MEDICINE PARK, OK 73557-0403
PO BOX 404, MEDICINE PARK, OK 73557-0404
PO BOX 405, MEDICINE PARK, OK 73557-0405
PO BOX 406, MEDICINE PARK, OK 73557-0406
PO BOX 407, MEDICINE PARK, OK 73557-0407
PO BOX 408, MEDICINE PARK, OK 73557-0408
PO BOX 409, MEDICINE PARK, OK 73557-0409
PO BOX 410, MEDICINE PARK, OK 73557-0410
PO BOX 411, MEDICINE PARK, OK 73557-0411
PO BOX 412, MEDICINE PARK, OK 73557-0412
PO BOX 413, MEDICINE PARK, OK 73557-0413
PO BOX 414, MEDICINE PARK, OK 73557-0414
PO BOX 415, MEDICINE PARK, OK 73557-0415
PO BOX 416, MEDICINE PARK, OK 73557-0416
PO BOX 417, MEDICINE PARK, OK 73557-0417
PO BOX 418, MEDICINE PARK, OK 73557-0418
PO BOX 419, MEDICINE PARK, OK 73557-0419
PO BOX 420, MEDICINE PARK, OK 73557-0420
PO BOX 421, MEDICINE PARK, OK 73557-0421
PO BOX 422, MEDICINE PARK, OK 73557-0422
PO BOX 423, MEDICINE PARK, OK 73557-0423
PO BOX 424, MEDICINE PARK, OK 73557-0424
PO BOX 425, MEDICINE PARK, OK 73557-0425
PO BOX 426, MEDICINE PARK, OK 73557-0426
PO BOX 427, MEDICINE PARK, OK 73557-0427
PO BOX 428, MEDICINE PARK, OK 73557-0428
PO BOX 429, MEDICINE PARK, OK 73557-0429
PO BOX 430, MEDICINE PARK, OK 73557-0430
PO BOX 431, MEDICINE PARK, OK 73557-0431
PO BOX 432, MEDICINE PARK, OK 73557-0432
PO BOX 433, MEDICINE PARK, OK 73557-0433
PO BOX 434, MEDICINE PARK, OK 73557-0434
PO BOX 435, MEDICINE PARK, OK 73557-0435
PO BOX 436, MEDICINE PARK, OK 73557-0436
PO BOX 437, MEDICINE PARK, OK 73557-0437
PO BOX 438, MEDICINE PARK, OK 73557-0438
PO BOX 439, MEDICINE PARK, OK 73557-0439
PO BOX 440, MEDICINE PARK, OK 73557-0440
PO BOX 441, MEDICINE PARK, OK 73557-0441
PO BOX 442, MEDICINE PARK, OK 73557-0442
PO BOX 443, MEDICINE PARK, OK 73557-0443
PO BOX 444, MEDICINE PARK, OK 73557-0444
PO BOX 445, MEDICINE PARK, OK 73557-0445
PO BOX 446, MEDICINE PARK, OK 73557-0446
PO BOX 447, MEDICINE PARK, OK 73557-0447
PO BOX 448, MEDICINE PARK, OK 73557-0448
PO BOX 449, MEDICINE PARK, OK 73557-0449
PO BOX 450, MEDICINE PARK, OK 73557-0450
PO BOX 451, MEDICINE PARK, OK 73557-0451
PO BOX 452, MEDICINE PARK, OK 73557-0452
PO BOX 453, MEDICINE PARK, OK 73557-0453
PO BOX 454, MEDICINE PARK, OK 73557-0454
PO BOX 455, MEDICINE PARK, OK 73557-0455
PO BOX 456, MEDICINE PARK, OK 73557-0456
PO BOX 457, MEDICINE PARK, OK 73557-0457
PO BOX 458, MEDICINE PARK, OK 73557-0458
PO BOX 459, MEDICINE PARK, OK 73557-0459
PO BOX 460, MEDICINE PARK, OK 73557-0460
PO BOX 461, MEDICINE PARK, OK 73557-0461
PO BOX 462, MEDICINE PARK, OK 73557-0462
PO BOX 463, MEDICINE PARK, OK 73557-0463
PO BOX 464, MEDICINE PARK, OK 73557-0464
PO BOX 465, MEDICINE PARK, OK 73557-0465
PO BOX 466, MEDICINE PARK, OK 73557-0466
PO BOX 467, MEDICINE PARK, OK 73557-0467
PO BOX 468, MEDICINE PARK, OK 73557-0468
PO BOX 469, MEDICINE PARK, OK 73557-0469
PO BOX 470, MEDICINE PARK, OK 73557-0470
PO BOX 471, MEDICINE PARK, OK 73557-0471
PO BOX 472, MEDICINE PARK, OK 73557-0472
PO BOX 473, MEDICINE PARK, OK 73557-0473
PO BOX 474, MEDICINE PARK, OK 73557-0474
PO BOX 475, MEDICINE PARK, OK 73557-0475
PO BOX 476, MEDICINE PARK, OK 73557-0476
PO BOX 477, MEDICINE PARK, OK 73557-0477
PO BOX 478, MEDICINE PARK, OK 73557-0478
PO BOX 479, MEDICINE PARK, OK 73557-0479
PO BOX 480, MEDICINE PARK, OK 73557-0480
PO BOX 481, MEDICINE PARK, OK 73557-0481
PO BOX 482, MEDICINE PARK, OK 73557-0482
PO BOX 483, MEDICINE PARK, OK 73557-0483
PO BOX 484, MEDICINE PARK, OK 73557-0484
PO BOX 485, MEDICINE PARK, OK 73557-0485
PO BOX 486, MEDICINE PARK, OK 73557-0486
PO BOX 487, MEDICINE PARK, OK 73557-0487
PO BOX 488, MEDICINE PARK, OK 73557-0488
PO BOX 489, MEDICINE PARK, OK 73557-0489
PO BOX 490, MEDICINE PARK, OK 73557-0490
PO BOX 491, MEDICINE PARK, OK 73557-0491
PO BOX 492, MEDICINE PARK, OK 73557-0492
PO BOX 493, MEDICINE PARK, OK 73557-0493
PO BOX 494, MEDICINE PARK, OK 73557-0494
PO BOX 495, MEDICINE PARK, OK 73557-0495
PO BOX 496, MEDICINE PARK, OK 73557-0496
PO BOX 497, MEDICINE PARK, OK 73557-0497
PO BOX 498, MEDICINE PARK, OK 73557-0498
PO BOX 499, MEDICINE PARK, OK 73557-0499
PO BOX 500, MEDICINE PARK, OK 73557-0500
PO BOX 501, MEDICINE PARK, OK 73557-0501
PO BOX 502, MEDICINE PARK, OK 73557-0502
PO BOX 503, MEDICINE PARK, OK 73557-0503
PO BOX 504, MEDICINE PARK, OK 73557-0504
PO BOX 505, MEDICINE PARK, OK 73557-0505
PO BOX 506, MEDICINE PARK, OK 73557-0506
PO BOX 507, MEDICINE PARK, OK 73557-0507
PO BOX 508, MEDICINE PARK, OK 73557-0508
PO BOX 509, MEDICINE PARK, OK 73557-0509
PO BOX 510, MEDICINE PARK, OK 73557-0510
PO BOX 511, MEDICINE PARK, OK 73557-0511
PO BOX 512, MEDICINE PARK, OK 73557-0512
PO BOX 513, MEDICINE PARK, OK 73557-0513
PO BOX 514, MEDICINE PARK, OK 73557-0514
PO BOX 515, MEDICINE PARK, OK 73557-0515
PO BOX 516, MEDICINE PARK, OK 73557-0516
PO BOX 517, MEDICINE PARK, OK 73557-0517
PO BOX 518, MEDICINE PARK, OK 73557-0518
PO BOX 519, MEDICINE PARK, OK 73557-0519
PO BOX 520, MEDICINE PARK, OK 73557-0520
PO BOX 521, MEDICINE PARK, OK 73557-0521
PO BOX 522, MEDICINE PARK, OK 73557-0522
PO BOX 523, MEDICINE PARK, OK 73557-0523
PO BOX 524, MEDICINE PARK, OK 73557-0524
PO BOX 525, MEDICINE PARK, OK 73557-0525
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