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 521, COLUMBUS, MS 39703-0521
PO BOX 522, COLUMBUS, MS 39703-0522
PO BOX 523, COLUMBUS, MS 39703-0523
PO BOX 524, COLUMBUS, MS 39703-0524
PO BOX 525, COLUMBUS, MS 39703-0525
PO BOX 526, COLUMBUS, MS 39703-0526
PO BOX 527, COLUMBUS, MS 39703-0527
PO BOX 528, COLUMBUS, MS 39703-0528
PO BOX 529, COLUMBUS, MS 39703-0529
PO BOX 530, COLUMBUS, MS 39703-0530
PO BOX 531, COLUMBUS, MS 39703-0531
PO BOX 532, COLUMBUS, MS 39703-0532
PO BOX 533, COLUMBUS, MS 39703-0533
PO BOX 534, COLUMBUS, MS 39703-0534
PO BOX 535, COLUMBUS, MS 39703-0535
PO BOX 536, COLUMBUS, MS 39703-0536
PO BOX 537, COLUMBUS, MS 39703-0537
PO BOX 538, COLUMBUS, MS 39703-0538
PO BOX 539, COLUMBUS, MS 39703-0539
PO BOX 540, COLUMBUS, MS 39703-0540
PO BOX 541, COLUMBUS, MS 39703-0541
PO BOX 542, COLUMBUS, MS 39703-0542
PO BOX 543, COLUMBUS, MS 39703-0543
PO BOX 544, COLUMBUS, MS 39703-0544
PO BOX 545, COLUMBUS, MS 39703-0545
PO BOX 546, COLUMBUS, MS 39703-0546
PO BOX 547, COLUMBUS, MS 39703-0547
PO BOX 548, COLUMBUS, MS 39703-0548
PO BOX 549, COLUMBUS, MS 39703-0549
PO BOX 550, COLUMBUS, MS 39703-0550
PO BOX 551, COLUMBUS, MS 39703-0551
PO BOX 552, COLUMBUS, MS 39703-0552
PO BOX 553, COLUMBUS, MS 39703-0553
PO BOX 554, COLUMBUS, MS 39703-0554
PO BOX 555, COLUMBUS, MS 39703-0555
PO BOX 556, COLUMBUS, MS 39703-0556
PO BOX 557, COLUMBUS, MS 39703-0557
PO BOX 558, COLUMBUS, MS 39703-0558
PO BOX 559, COLUMBUS, MS 39703-0559
PO BOX 560, COLUMBUS, MS 39703-0560
PO BOX 561, COLUMBUS, MS 39703-0561
PO BOX 562, COLUMBUS, MS 39703-0562
PO BOX 563, COLUMBUS, MS 39703-0563
PO BOX 564, COLUMBUS, MS 39703-0564
PO BOX 565, COLUMBUS, MS 39703-0565
PO BOX 566, COLUMBUS, MS 39703-0566
PO BOX 567, COLUMBUS, MS 39703-0567
PO BOX 568, COLUMBUS, MS 39703-0568
PO BOX 569, COLUMBUS, MS 39703-0569
PO BOX 570, COLUMBUS, MS 39703-0570
PO BOX 571, COLUMBUS, MS 39703-0571
PO BOX 572, COLUMBUS, MS 39703-0572
PO BOX 573, COLUMBUS, MS 39703-0573
PO BOX 574, COLUMBUS, MS 39703-0574
PO BOX 575, COLUMBUS, MS 39703-0575
PO BOX 576, COLUMBUS, MS 39703-0576
PO BOX 577, COLUMBUS, MS 39703-0577
PO BOX 578, COLUMBUS, MS 39703-0578
PO BOX 579, COLUMBUS, MS 39703-0579
PO BOX 580, COLUMBUS, MS 39703-0580
PO BOX 581, COLUMBUS, MS 39703-0581
PO BOX 582, COLUMBUS, MS 39703-0582
PO BOX 583, COLUMBUS, MS 39703-0583
PO BOX 584, COLUMBUS, MS 39703-0584
PO BOX 585, COLUMBUS, MS 39703-0585
PO BOX 586, COLUMBUS, MS 39703-0586
PO BOX 587, COLUMBUS, MS 39703-0587
PO BOX 588, COLUMBUS, MS 39703-0588
PO BOX 589, COLUMBUS, MS 39703-0589
PO BOX 590, COLUMBUS, MS 39703-0590
PO BOX 591, COLUMBUS, MS 39703-0591
PO BOX 592, COLUMBUS, MS 39703-0592
PO BOX 593, COLUMBUS, MS 39703-0593
PO BOX 594, COLUMBUS, MS 39703-0594
PO BOX 595, COLUMBUS, MS 39703-0595
PO BOX 596, COLUMBUS, MS 39703-0596
PO BOX 597, COLUMBUS, MS 39703-0597
PO BOX 598, COLUMBUS, MS 39703-0598
PO BOX 599, COLUMBUS, MS 39703-0599
PO BOX 600, COLUMBUS, MS 39703-0600
PO BOX 601, COLUMBUS, MS 39703-0601
PO BOX 602, COLUMBUS, MS 39703-0602
PO BOX 603, COLUMBUS, MS 39703-0603
PO BOX 604, COLUMBUS, MS 39703-0604
PO BOX 605, COLUMBUS, MS 39703-0605
PO BOX 606, COLUMBUS, MS 39703-0606
PO BOX 607, COLUMBUS, MS 39703-0607
PO BOX 608, COLUMBUS, MS 39703-0608
PO BOX 609, COLUMBUS, MS 39703-0609
PO BOX 610, COLUMBUS, MS 39703-0610
PO BOX 611, COLUMBUS, MS 39703-0611
PO BOX 612, COLUMBUS, MS 39703-0612
PO BOX 613, COLUMBUS, MS 39703-0613
PO BOX 614, COLUMBUS, MS 39703-0614
PO BOX 615, COLUMBUS, MS 39703-0615
PO BOX 616, COLUMBUS, MS 39703-0616
PO BOX 617, COLUMBUS, MS 39703-0617
PO BOX 618, COLUMBUS, MS 39703-0618
PO BOX 619, COLUMBUS, MS 39703-0619
PO BOX 620, COLUMBUS, MS 39703-0620
PO BOX 621, COLUMBUS, MS 39703-0621
PO BOX 622, COLUMBUS, MS 39703-0622
PO BOX 623, COLUMBUS, MS 39703-0623
PO BOX 624, COLUMBUS, MS 39703-0624
PO BOX 625, COLUMBUS, MS 39703-0625
PO BOX 626, COLUMBUS, MS 39703-0626
PO BOX 627, COLUMBUS, MS 39703-0627
PO BOX 628, COLUMBUS, MS 39703-0628
PO BOX 629, COLUMBUS, MS 39703-0629
PO BOX 630, COLUMBUS, MS 39703-0630
PO BOX 631, COLUMBUS, MS 39703-0631
PO BOX 632, COLUMBUS, MS 39703-0632
PO BOX 633, COLUMBUS, MS 39703-0633
PO BOX 634, COLUMBUS, MS 39703-0634
PO BOX 635, COLUMBUS, MS 39703-0635
PO BOX 636, COLUMBUS, MS 39703-0636
PO BOX 637, COLUMBUS, MS 39703-0637
PO BOX 638, COLUMBUS, MS 39703-0638
PO BOX 639, COLUMBUS, MS 39703-0639
PO BOX 640, COLUMBUS, MS 39703-0640
PO BOX 641, COLUMBUS, MS 39703-0641
PO BOX 642, COLUMBUS, MS 39703-0642
PO BOX 643, COLUMBUS, MS 39703-0643
PO BOX 644, COLUMBUS, MS 39703-0644
PO BOX 645, COLUMBUS, MS 39703-0645
PO BOX 646, COLUMBUS, MS 39703-0646
PO BOX 647, COLUMBUS, MS 39703-0647
PO BOX 648, COLUMBUS, MS 39703-0648
PO BOX 649, COLUMBUS, MS 39703-0649
PO BOX 650, COLUMBUS, MS 39703-0650
PO BOX 651, COLUMBUS, MS 39703-0651
PO BOX 652, COLUMBUS, MS 39703-0652
PO BOX 653, COLUMBUS, MS 39703-0653
PO BOX 654, COLUMBUS, MS 39703-0654
PO BOX 655, COLUMBUS, MS 39703-0655
PO BOX 656, COLUMBUS, MS 39703-0656
PO BOX 657, COLUMBUS, MS 39703-0657
PO BOX 658, COLUMBUS, MS 39703-0658
PO BOX 659, COLUMBUS, MS 39703-0659
PO BOX 660, COLUMBUS, MS 39703-0660
PO BOX 661, COLUMBUS, MS 39703-0661
PO BOX 662, COLUMBUS, MS 39703-0662
PO BOX 663, COLUMBUS, MS 39703-0663
PO BOX 664, COLUMBUS, MS 39703-0664
PO BOX 665, COLUMBUS, MS 39703-0665
PO BOX 666, COLUMBUS, MS 39703-0666
PO BOX 667, COLUMBUS, MS 39703-0667
PO BOX 668, COLUMBUS, MS 39703-0668
PO BOX 669, COLUMBUS, MS 39703-0669
PO BOX 670, COLUMBUS, MS 39703-0670
PO BOX 671, COLUMBUS, MS 39703-0671
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