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 412, MICHIGAN CITY, IN 46361-0412
PO BOX 413, MICHIGAN CITY, IN 46361-0413
PO BOX 414, MICHIGAN CITY, IN 46361-0414
PO BOX 415, MICHIGAN CITY, IN 46361-0415
PO BOX 416, MICHIGAN CITY, IN 46361-0416
PO BOX 417, MICHIGAN CITY, IN 46361-0417
PO BOX 418, MICHIGAN CITY, IN 46361-0418
PO BOX 419, MICHIGAN CITY, IN 46361-0419
PO BOX 420, MICHIGAN CITY, IN 46361-0420
PO BOX 421, MICHIGAN CITY, IN 46361-0421
PO BOX 422, MICHIGAN CITY, IN 46361-0422
PO BOX 423, MICHIGAN CITY, IN 46361-0423
PO BOX 424, MICHIGAN CITY, IN 46361-0424
PO BOX 425, MICHIGAN CITY, IN 46361-0425
PO BOX 426, MICHIGAN CITY, IN 46361-0426
PO BOX 427, MICHIGAN CITY, IN 46361-0427
PO BOX 428, MICHIGAN CITY, IN 46361-0428
PO BOX 429, MICHIGAN CITY, IN 46361-0429
PO BOX 430, MICHIGAN CITY, IN 46361-0430
PO BOX 431, MICHIGAN CITY, IN 46361-0431
PO BOX 432, MICHIGAN CITY, IN 46361-0432
PO BOX 433, MICHIGAN CITY, IN 46361-0433
PO BOX 434, MICHIGAN CITY, IN 46361-0434
PO BOX 435, MICHIGAN CITY, IN 46361-0435
PO BOX 436, MICHIGAN CITY, IN 46361-0436
PO BOX 437, MICHIGAN CITY, IN 46361-0437
PO BOX 438, MICHIGAN CITY, IN 46361-0438
PO BOX 439, MICHIGAN CITY, IN 46361-0439
PO BOX 440, MICHIGAN CITY, IN 46361-0440
PO BOX 441, MICHIGAN CITY, IN 46361-0441
PO BOX 442, MICHIGAN CITY, IN 46361-0442
PO BOX 443, MICHIGAN CITY, IN 46361-0443
PO BOX 444, MICHIGAN CITY, IN 46361-0444
PO BOX 445, MICHIGAN CITY, IN 46361-0445
PO BOX 446, MICHIGAN CITY, IN 46361-0446
PO BOX 447, MICHIGAN CITY, IN 46361-0447
PO BOX 448, MICHIGAN CITY, IN 46361-0448
PO BOX 449, MICHIGAN CITY, IN 46361-0449
PO BOX 450, MICHIGAN CITY, IN 46361-0450
PO BOX 451, MICHIGAN CITY, IN 46361-0451
PO BOX 452, MICHIGAN CITY, IN 46361-0452
PO BOX 453, MICHIGAN CITY, IN 46361-0453
PO BOX 454, MICHIGAN CITY, IN 46361-0454
PO BOX 455, MICHIGAN CITY, IN 46361-0455
PO BOX 456, MICHIGAN CITY, IN 46361-0456
PO BOX 457, MICHIGAN CITY, IN 46361-0457
PO BOX 458, MICHIGAN CITY, IN 46361-0458
PO BOX 459, MICHIGAN CITY, IN 46361-0459
PO BOX 460, MICHIGAN CITY, IN 46361-0460
PO BOX 461, MICHIGAN CITY, IN 46361-0461
PO BOX 462, MICHIGAN CITY, IN 46361-0462
PO BOX 463, MICHIGAN CITY, IN 46361-0463
PO BOX 464, MICHIGAN CITY, IN 46361-0464
PO BOX 465, MICHIGAN CITY, IN 46361-0465
PO BOX 466, MICHIGAN CITY, IN 46361-0466
PO BOX 467, MICHIGAN CITY, IN 46361-0467
PO BOX 468, MICHIGAN CITY, IN 46361-0468
PO BOX 469, MICHIGAN CITY, IN 46361-0469
PO BOX 470, MICHIGAN CITY, IN 46361-0470
PO BOX 471, MICHIGAN CITY, IN 46361-0471
PO BOX 472, MICHIGAN CITY, IN 46361-0472
PO BOX 473, MICHIGAN CITY, IN 46361-0473
PO BOX 474, MICHIGAN CITY, IN 46361-0474
PO BOX 475, MICHIGAN CITY, IN 46361-0475
PO BOX 476, MICHIGAN CITY, IN 46361-0476
PO BOX 477, MICHIGAN CITY, IN 46361-0477
PO BOX 478, MICHIGAN CITY, IN 46361-0478
PO BOX 479, MICHIGAN CITY, IN 46361-0479
PO BOX 480, MICHIGAN CITY, IN 46361-0480
PO BOX 481, MICHIGAN CITY, IN 46361-0481
PO BOX 482, MICHIGAN CITY, IN 46361-0482
PO BOX 483, MICHIGAN CITY, IN 46361-0483
PO BOX 484, MICHIGAN CITY, IN 46361-0484
PO BOX 485, MICHIGAN CITY, IN 46361-0485
PO BOX 486, MICHIGAN CITY, IN 46361-0486
PO BOX 487, MICHIGAN CITY, IN 46361-0487
PO BOX 488, MICHIGAN CITY, IN 46361-0488
PO BOX 489, MICHIGAN CITY, IN 46361-0489
PO BOX 490, MICHIGAN CITY, IN 46361-0490
PO BOX 491, MICHIGAN CITY, IN 46361-0491
PO BOX 492, MICHIGAN CITY, IN 46361-0492
PO BOX 493, MICHIGAN CITY, IN 46361-0493
PO BOX 494, MICHIGAN CITY, IN 46361-0494
PO BOX 495, MICHIGAN CITY, IN 46361-0495
PO BOX 496, MICHIGAN CITY, IN 46361-0496
PO BOX 497, MICHIGAN CITY, IN 46361-0497
PO BOX 498, MICHIGAN CITY, IN 46361-0498
PO BOX 499, MICHIGAN CITY, IN 46361-0499
PO BOX 500, MICHIGAN CITY, IN 46361-0500
PO BOX 501, MICHIGAN CITY, IN 46361-0501
PO BOX 502, MICHIGAN CITY, IN 46361-0502
PO BOX 503, MICHIGAN CITY, IN 46361-0503
PO BOX 504, MICHIGAN CITY, IN 46361-0504
PO BOX 505, MICHIGAN CITY, IN 46361-0505
PO BOX 506, MICHIGAN CITY, IN 46361-0506
PO BOX 507, MICHIGAN CITY, IN 46361-0507
PO BOX 508, MICHIGAN CITY, IN 46361-0508
PO BOX 509, MICHIGAN CITY, IN 46361-0509
PO BOX 510, MICHIGAN CITY, IN 46361-0510
PO BOX 511, MICHIGAN CITY, IN 46361-0511
PO BOX 512, MICHIGAN CITY, IN 46361-0512
PO BOX 513, MICHIGAN CITY, IN 46361-0513
PO BOX 514, MICHIGAN CITY, IN 46361-0514
PO BOX 515, MICHIGAN CITY, IN 46361-0515
PO BOX 516, MICHIGAN CITY, IN 46361-0516
PO BOX 517, MICHIGAN CITY, IN 46361-0517
PO BOX 518, MICHIGAN CITY, IN 46361-0518
PO BOX 519, MICHIGAN CITY, IN 46361-0519
PO BOX 520, MICHIGAN CITY, IN 46361-0520
PO BOX 521, MICHIGAN CITY, IN 46361-0521
PO BOX 522, MICHIGAN CITY, IN 46361-0522
PO BOX 523, MICHIGAN CITY, IN 46361-0523
PO BOX 524, MICHIGAN CITY, IN 46361-0524
PO BOX 525, MICHIGAN CITY, IN 46361-0525
PO BOX 526, MICHIGAN CITY, IN 46361-0526
PO BOX 527, MICHIGAN CITY, IN 46361-0527
PO BOX 528, MICHIGAN CITY, IN 46361-0528
PO BOX 529, MICHIGAN CITY, IN 46361-0529
PO BOX 530, MICHIGAN CITY, IN 46361-0530
PO BOX 531, MICHIGAN CITY, IN 46361-0531
PO BOX 532, MICHIGAN CITY, IN 46361-0532
PO BOX 533, MICHIGAN CITY, IN 46361-0533
PO BOX 534, MICHIGAN CITY, IN 46361-0534
PO BOX 535, MICHIGAN CITY, IN 46361-0535
PO BOX 536, MICHIGAN CITY, IN 46361-0536
PO BOX 537, MICHIGAN CITY, IN 46361-0537
PO BOX 538, MICHIGAN CITY, IN 46361-0538
PO BOX 539, MICHIGAN CITY, IN 46361-0539
PO BOX 540, MICHIGAN CITY, IN 46361-0540
PO BOX 541, MICHIGAN CITY, IN 46361-0541
PO BOX 542, MICHIGAN CITY, IN 46361-0542
PO BOX 543, MICHIGAN CITY, IN 46361-0543
PO BOX 544, MICHIGAN CITY, IN 46361-0544
PO BOX 545, MICHIGAN CITY, IN 46361-0545
PO BOX 546, MICHIGAN CITY, IN 46361-0546
PO BOX 547, MICHIGAN CITY, IN 46361-0547
PO BOX 548, MICHIGAN CITY, IN 46361-0548
PO BOX 549, MICHIGAN CITY, IN 46361-0549
PO BOX 550, MICHIGAN CITY, IN 46361-0550
PO BOX 551, MICHIGAN CITY, IN 46361-0551
PO BOX 552, MICHIGAN CITY, IN 46361-0552
PO BOX 553, MICHIGAN CITY, IN 46361-0553
PO BOX 554, MICHIGAN CITY, IN 46361-0554
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