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 421, ALTON, MO 65606-0421
PO BOX 422, ALTON, MO 65606-0422
PO BOX 423, ALTON, MO 65606-0423
PO BOX 424, ALTON, MO 65606-0424
PO BOX 425, ALTON, MO 65606-0425
PO BOX 426, ALTON, MO 65606-0426
PO BOX 427, ALTON, MO 65606-0427
PO BOX 428, ALTON, MO 65606-0428
PO BOX 429, ALTON, MO 65606-0429
PO BOX 430, ALTON, MO 65606-0430
PO BOX 431, ALTON, MO 65606-0431
PO BOX 432, ALTON, MO 65606-0432
PO BOX 433, ALTON, MO 65606-0433
PO BOX 434, ALTON, MO 65606-0434
PO BOX 435, ALTON, MO 65606-0435
PO BOX 436, ALTON, MO 65606-0436
PO BOX 437, ALTON, MO 65606-0437
PO BOX 438, ALTON, MO 65606-0438
PO BOX 439, ALTON, MO 65606-0439
PO BOX 440, ALTON, MO 65606-0440
PO BOX 441, ALTON, MO 65606-0441
PO BOX 442, ALTON, MO 65606-0442
PO BOX 443, ALTON, MO 65606-0443
PO BOX 444, ALTON, MO 65606-0444
PO BOX 445, ALTON, MO 65606-0445
PO BOX 446, ALTON, MO 65606-0446
PO BOX 447, ALTON, MO 65606-0447
PO BOX 448, ALTON, MO 65606-0448
PO BOX 449, ALTON, MO 65606-0449
PO BOX 450, ALTON, MO 65606-0450
PO BOX 451, ALTON, MO 65606-0451
PO BOX 452, ALTON, MO 65606-0452
PO BOX 453, ALTON, MO 65606-0453
PO BOX 454, ALTON, MO 65606-0454
PO BOX 455, ALTON, MO 65606-0455
PO BOX 456, ALTON, MO 65606-0456
PO BOX 457, ALTON, MO 65606-0457
PO BOX 458, ALTON, MO 65606-0458
PO BOX 459, ALTON, MO 65606-0459
PO BOX 460, ALTON, MO 65606-0460
PO BOX 461, ALTON, MO 65606-0461
PO BOX 462, ALTON, MO 65606-0462
PO BOX 463, ALTON, MO 65606-0463
PO BOX 464, ALTON, MO 65606-0464
PO BOX 465, ALTON, MO 65606-0465
PO BOX 466, ALTON, MO 65606-0466
PO BOX 467, ALTON, MO 65606-0467
PO BOX 468, ALTON, MO 65606-0468
PO BOX 469, ALTON, MO 65606-0469
PO BOX 470, ALTON, MO 65606-0470
PO BOX 471, ALTON, MO 65606-0471
PO BOX 472, ALTON, MO 65606-0472
PO BOX 473, ALTON, MO 65606-0473
PO BOX 474, ALTON, MO 65606-0474
PO BOX 475, ALTON, MO 65606-0475
PO BOX 476, ALTON, MO 65606-0476
PO BOX 477, ALTON, MO 65606-0477
PO BOX 478, ALTON, MO 65606-0478
PO BOX 479, ALTON, MO 65606-0479
PO BOX 480, ALTON, MO 65606-0480
PO BOX 481, ALTON, MO 65606-0481
PO BOX 482, ALTON, MO 65606-0482
PO BOX 483, ALTON, MO 65606-0483
PO BOX 484, ALTON, MO 65606-0484
PO BOX 485, ALTON, MO 65606-0485
PO BOX 486, ALTON, MO 65606-0486
PO BOX 487, ALTON, MO 65606-0487
PO BOX 488, ALTON, MO 65606-0488
PO BOX 489, ALTON, MO 65606-0489
PO BOX 490, ALTON, MO 65606-0490
PO BOX 491, ALTON, MO 65606-0491
PO BOX 492, ALTON, MO 65606-0492
PO BOX 493, ALTON, MO 65606-0493
PO BOX 494, ALTON, MO 65606-0494
PO BOX 495, ALTON, MO 65606-0495
PO BOX 496, ALTON, MO 65606-0496
PO BOX 497, ALTON, MO 65606-0497
PO BOX 498, ALTON, MO 65606-0498
PO BOX 499, ALTON, MO 65606-0499
PO BOX 500, ALTON, MO 65606-0500
PO BOX 501, ALTON, MO 65606-0501
PO BOX 502, ALTON, MO 65606-0502
PO BOX 503, ALTON, MO 65606-0503
PO BOX 504, ALTON, MO 65606-0504
PO BOX 505, ALTON, MO 65606-0505
PO BOX 506, ALTON, MO 65606-0506
PO BOX 507, ALTON, MO 65606-0507
PO BOX 508, ALTON, MO 65606-0508
PO BOX 509, ALTON, MO 65606-0509
PO BOX 510, ALTON, MO 65606-0510
PO BOX 511, ALTON, MO 65606-0511
PO BOX 512, ALTON, MO 65606-0512
PO BOX 513, ALTON, MO 65606-0513
PO BOX 514, ALTON, MO 65606-0514
PO BOX 515, ALTON, MO 65606-0515
PO BOX 516, ALTON, MO 65606-0516
PO BOX 517, ALTON, MO 65606-0517
PO BOX 518, ALTON, MO 65606-0518
PO BOX 519, ALTON, MO 65606-0519
PO BOX 520, ALTON, MO 65606-0520
PO BOX 521, ALTON, MO 65606-0521
PO BOX 522, ALTON, MO 65606-0522
PO BOX 523, ALTON, MO 65606-0523
PO BOX 524, ALTON, MO 65606-0524
PO BOX 525, ALTON, MO 65606-0525
PO BOX 526, ALTON, MO 65606-0526
PO BOX 527, ALTON, MO 65606-0527
PO BOX 528, ALTON, MO 65606-0528
PO BOX 529, ALTON, MO 65606-0529
PO BOX 530, ALTON, MO 65606-0530
PO BOX 531, ALTON, MO 65606-0531
PO BOX 532, ALTON, MO 65606-0532
PO BOX 533, ALTON, MO 65606-0533
PO BOX 534, ALTON, MO 65606-0534
PO BOX 535, ALTON, MO 65606-0535
PO BOX 536, ALTON, MO 65606-0536
PO BOX 537, ALTON, MO 65606-0537
PO BOX 538, ALTON, MO 65606-0538
PO BOX 539, ALTON, MO 65606-0539
PO BOX 540, ALTON, MO 65606-0540
PO BOX 541, ALTON, MO 65606-0541
PO BOX 542, ALTON, MO 65606-0542
PO BOX 543, ALTON, MO 65606-0543
PO BOX 544, ALTON, MO 65606-0544
PO BOX 545, ALTON, MO 65606-0545
PO BOX 546, ALTON, MO 65606-0546
PO BOX 547, ALTON, MO 65606-0547
PO BOX 548, ALTON, MO 65606-0548
PO BOX 549, ALTON, MO 65606-0549
PO BOX 550, ALTON, MO 65606-0550
PO BOX 551, ALTON, MO 65606-0551
PO BOX 552, ALTON, MO 65606-0552
PO BOX 553, ALTON, MO 65606-0553
PO BOX 554, ALTON, MO 65606-0554
PO BOX 555, ALTON, MO 65606-0555
PO BOX 556, ALTON, MO 65606-0556
PO BOX 557, ALTON, MO 65606-0557
PO BOX 558, ALTON, MO 65606-0558
PO BOX 559, ALTON, MO 65606-0559
PO BOX 560, ALTON, MO 65606-0560
PO BOX 561, ALTON, MO 65606-0561
PO BOX 562, ALTON, MO 65606-0562
PO BOX 563, ALTON, MO 65606-0563
PO BOX 564, ALTON, MO 65606-0564
PO BOX 565, ALTON, MO 65606-0565
PO BOX 566, ALTON, MO 65606-0566
PO BOX 567, ALTON, MO 65606-0567
PO BOX 568, ALTON, MO 65606-0568
PO BOX 569, ALTON, MO 65606-0569
PO BOX 570, ALTON, MO 65606-0570
PO BOX 571, ALTON, MO 65606-0571
PO BOX 572, ALTON, MO 65606-0572
PO BOX 573, ALTON, MO 65606-0573
PO BOX 574, ALTON, MO 65606-0574
PO BOX 575, ALTON, MO 65606-0575
PO BOX 576, ALTON, MO 65606-0576
PO BOX 577, ALTON, MO 65606-0577
PO BOX 578, ALTON, MO 65606-0578
PO BOX 579, ALTON, MO 65606-0579
PO BOX 580, ALTON, MO 65606-0580
PO BOX 581, ALTON, MO 65606-0581
PO BOX 582, ALTON, MO 65606-0582
PO BOX 583, ALTON, MO 65606-0583
PO BOX 584, ALTON, MO 65606-0584
PO BOX 585, ALTON, MO 65606-0585
PO BOX 586, ALTON, MO 65606-0586
PO BOX 587, ALTON, MO 65606-0587
PO BOX 588, ALTON, MO 65606-0588
PO BOX 589, ALTON, MO 65606-0589
PO BOX 590, ALTON, MO 65606-0590
PO BOX 591, ALTON, MO 65606-0591
PO BOX 592, ALTON, MO 65606-0592
PO BOX 593, ALTON, MO 65606-0593
PO BOX 594, ALTON, MO 65606-0594
PO BOX 595, ALTON, MO 65606-0595
PO BOX 596, ALTON, MO 65606-0596
PO BOX 597, ALTON, MO 65606-0597
PO BOX 598, ALTON, MO 65606-0598
PO BOX 599, ALTON, MO 65606-0599
PO BOX 600, ALTON, MO 65606-0600
PO BOX 601, ALTON, MO 65606-0601
PO BOX 602, ALTON, MO 65606-0602
PO BOX 603, ALTON, MO 65606-0603
PO BOX 604, ALTON, MO 65606-0604
PO BOX 605, ALTON, MO 65606-0605
PO BOX 606, ALTON, MO 65606-0606
PO BOX 607, ALTON, MO 65606-0607
PO BOX 608, ALTON, MO 65606-0608
PO BOX 609, ALTON, MO 65606-0609
PO BOX 610, ALTON, MO 65606-0610
PO BOX 611, ALTON, MO 65606-0611
PO BOX 612, ALTON, MO 65606-0612
PO BOX 613, ALTON, MO 65606-0613
PO BOX 614, ALTON, MO 65606-0614
PO BOX 615, ALTON, MO 65606-0615
PO BOX 616, ALTON, MO 65606-0616
PO BOX 617, ALTON, MO 65606-0617
PO BOX 618, ALTON, MO 65606-0618
PO BOX 619, ALTON, MO 65606-0619
PO BOX 620, ALTON, MO 65606-0620
PO BOX 621, ALTON, MO 65606-0621
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