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, KINGSVILLE, TX 78364-0521
PO BOX 522, KINGSVILLE, TX 78364-0522
PO BOX 523, KINGSVILLE, TX 78364-0523
PO BOX 524, KINGSVILLE, TX 78364-0524
PO BOX 525, KINGSVILLE, TX 78364-0525
PO BOX 526, KINGSVILLE, TX 78364-0526
PO BOX 527, KINGSVILLE, TX 78364-0527
PO BOX 528, KINGSVILLE, TX 78364-0528
PO BOX 529, KINGSVILLE, TX 78364-0529
PO BOX 530, KINGSVILLE, TX 78364-0530
PO BOX 531, KINGSVILLE, TX 78364-0531
PO BOX 532, KINGSVILLE, TX 78364-0532
PO BOX 533, KINGSVILLE, TX 78364-0533
PO BOX 534, KINGSVILLE, TX 78364-0534
PO BOX 535, KINGSVILLE, TX 78364-0535
PO BOX 536, KINGSVILLE, TX 78364-0536
PO BOX 537, KINGSVILLE, TX 78364-0537
PO BOX 538, KINGSVILLE, TX 78364-0538
PO BOX 539, KINGSVILLE, TX 78364-0539
PO BOX 540, KINGSVILLE, TX 78364-0540
PO BOX 541, KINGSVILLE, TX 78364-0541
PO BOX 542, KINGSVILLE, TX 78364-0542
PO BOX 543, KINGSVILLE, TX 78364-0543
PO BOX 544, KINGSVILLE, TX 78364-0544
PO BOX 545, KINGSVILLE, TX 78364-0545
PO BOX 546, KINGSVILLE, TX 78364-0546
PO BOX 547, KINGSVILLE, TX 78364-0547
PO BOX 548, KINGSVILLE, TX 78364-0548
PO BOX 549, KINGSVILLE, TX 78364-0549
PO BOX 550, KINGSVILLE, TX 78364-0550
PO BOX 551, KINGSVILLE, TX 78364-0551
PO BOX 552, KINGSVILLE, TX 78364-0552
PO BOX 553, KINGSVILLE, TX 78364-0553
PO BOX 554, KINGSVILLE, TX 78364-0554
PO BOX 555, KINGSVILLE, TX 78364-0555
PO BOX 556, KINGSVILLE, TX 78364-0556
PO BOX 557, KINGSVILLE, TX 78364-0557
PO BOX 558, KINGSVILLE, TX 78364-0558
PO BOX 559, KINGSVILLE, TX 78364-0559
PO BOX 560, KINGSVILLE, TX 78364-0560
PO BOX 561, KINGSVILLE, TX 78364-0561
PO BOX 562, KINGSVILLE, TX 78364-0562
PO BOX 563, KINGSVILLE, TX 78364-0563
PO BOX 564, KINGSVILLE, TX 78364-0564
PO BOX 565, KINGSVILLE, TX 78364-0565
PO BOX 566, KINGSVILLE, TX 78364-0566
PO BOX 567, KINGSVILLE, TX 78364-0567
PO BOX 568, KINGSVILLE, TX 78364-0568
PO BOX 569, KINGSVILLE, TX 78364-0569
PO BOX 570, KINGSVILLE, TX 78364-0570
PO BOX 571, KINGSVILLE, TX 78364-0571
PO BOX 572, KINGSVILLE, TX 78364-0572
PO BOX 573, KINGSVILLE, TX 78364-0573
PO BOX 574, KINGSVILLE, TX 78364-0574
PO BOX 575, KINGSVILLE, TX 78364-0575
PO BOX 576, KINGSVILLE, TX 78364-0576
PO BOX 577, KINGSVILLE, TX 78364-0577
PO BOX 578, KINGSVILLE, TX 78364-0578
PO BOX 579, KINGSVILLE, TX 78364-0579
PO BOX 580, KINGSVILLE, TX 78364-0580
PO BOX 581, KINGSVILLE, TX 78364-0581
PO BOX 582, KINGSVILLE, TX 78364-0582
PO BOX 583, KINGSVILLE, TX 78364-0583
PO BOX 584, KINGSVILLE, TX 78364-0584
PO BOX 585, KINGSVILLE, TX 78364-0585
PO BOX 586, KINGSVILLE, TX 78364-0586
PO BOX 587, KINGSVILLE, TX 78364-0587
PO BOX 588, KINGSVILLE, TX 78364-0588
PO BOX 589, KINGSVILLE, TX 78364-0589
PO BOX 590, KINGSVILLE, TX 78364-0590
PO BOX 591, KINGSVILLE, TX 78364-0591
PO BOX 592, KINGSVILLE, TX 78364-0592
PO BOX 593, KINGSVILLE, TX 78364-0593
PO BOX 594, KINGSVILLE, TX 78364-0594
PO BOX 595, KINGSVILLE, TX 78364-0595
PO BOX 596, KINGSVILLE, TX 78364-0596
PO BOX 597, KINGSVILLE, TX 78364-0597
PO BOX 598, KINGSVILLE, TX 78364-0598
PO BOX 599, KINGSVILLE, TX 78364-0599
PO BOX 600, KINGSVILLE, TX 78364-0600
PO BOX 601, KINGSVILLE, TX 78364-0601
PO BOX 602, KINGSVILLE, TX 78364-0602
PO BOX 603, KINGSVILLE, TX 78364-0603
PO BOX 604, KINGSVILLE, TX 78364-0604
PO BOX 605, KINGSVILLE, TX 78364-0605
PO BOX 606, KINGSVILLE, TX 78364-0606
PO BOX 607, KINGSVILLE, TX 78364-0607
PO BOX 608, KINGSVILLE, TX 78364-0608
PO BOX 609, KINGSVILLE, TX 78364-0609
PO BOX 610, KINGSVILLE, TX 78364-0610
PO BOX 611, KINGSVILLE, TX 78364-0611
PO BOX 612, KINGSVILLE, TX 78364-0612
PO BOX 613, KINGSVILLE, TX 78364-0613
PO BOX 614, KINGSVILLE, TX 78364-0614
PO BOX 615, KINGSVILLE, TX 78364-0615
PO BOX 616, KINGSVILLE, TX 78364-0616
PO BOX 617, KINGSVILLE, TX 78364-0617
PO BOX 618, KINGSVILLE, TX 78364-0618
PO BOX 619, KINGSVILLE, TX 78364-0619
PO BOX 620, KINGSVILLE, TX 78364-0620
PO BOX 621, KINGSVILLE, TX 78364-0621
PO BOX 622, KINGSVILLE, TX 78364-0622
PO BOX 623, KINGSVILLE, TX 78364-0623
PO BOX 624, KINGSVILLE, TX 78364-0624
PO BOX 625, KINGSVILLE, TX 78364-0625
PO BOX 626, KINGSVILLE, TX 78364-0626
PO BOX 627, KINGSVILLE, TX 78364-0627
PO BOX 628, KINGSVILLE, TX 78364-0628
PO BOX 629, KINGSVILLE, TX 78364-0629
PO BOX 630, KINGSVILLE, TX 78364-0630
PO BOX 631, KINGSVILLE, TX 78364-0631
PO BOX 632, KINGSVILLE, TX 78364-0632
PO BOX 633, KINGSVILLE, TX 78364-0633
PO BOX 634, KINGSVILLE, TX 78364-0634
PO BOX 635, KINGSVILLE, TX 78364-0635
PO BOX 636, KINGSVILLE, TX 78364-0636
PO BOX 637, KINGSVILLE, TX 78364-0637
PO BOX 638, KINGSVILLE, TX 78364-0638
PO BOX 639, KINGSVILLE, TX 78364-0639
PO BOX 640, KINGSVILLE, TX 78364-0640
PO BOX 641, KINGSVILLE, TX 78364-0641
PO BOX 642, KINGSVILLE, TX 78364-0642
PO BOX 643, KINGSVILLE, TX 78364-0643
PO BOX 644, KINGSVILLE, TX 78364-0644
PO BOX 645, KINGSVILLE, TX 78364-0645
PO BOX 646, KINGSVILLE, TX 78364-0646
PO BOX 647, KINGSVILLE, TX 78364-0647
PO BOX 648, KINGSVILLE, TX 78364-0648
PO BOX 649, KINGSVILLE, TX 78364-0649
PO BOX 650, KINGSVILLE, TX 78364-0650
PO BOX 651, KINGSVILLE, TX 78364-0651
PO BOX 652, KINGSVILLE, TX 78364-0652
PO BOX 653, KINGSVILLE, TX 78364-0653
PO BOX 654, KINGSVILLE, TX 78364-0654
PO BOX 655, KINGSVILLE, TX 78364-0655
PO BOX 656, KINGSVILLE, TX 78364-0656
PO BOX 657, KINGSVILLE, TX 78364-0657
PO BOX 658, KINGSVILLE, TX 78364-0658
PO BOX 659, KINGSVILLE, TX 78364-0659
PO BOX 660, KINGSVILLE, TX 78364-0660
PO BOX 661, KINGSVILLE, TX 78364-0661
PO BOX 662, KINGSVILLE, TX 78364-0662
PO BOX 663, KINGSVILLE, TX 78364-0663
PO BOX 664, KINGSVILLE, TX 78364-0664
PO BOX 665, KINGSVILLE, TX 78364-0665
PO BOX 666, KINGSVILLE, TX 78364-0666
PO BOX 667, KINGSVILLE, TX 78364-0667
PO BOX 668, KINGSVILLE, TX 78364-0668
PO BOX 669, KINGSVILLE, TX 78364-0669
PO BOX 670, KINGSVILLE, TX 78364-0670
PO BOX 671, KINGSVILLE, TX 78364-0671
PO BOX 672, KINGSVILLE, TX 78364-0672
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