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 541, TOWNSEND, DE 19734-0541
PO BOX 542, TOWNSEND, DE 19734-0542
PO BOX 543, TOWNSEND, DE 19734-0543
PO BOX 544, TOWNSEND, DE 19734-0544
PO BOX 545, TOWNSEND, DE 19734-0545
PO BOX 546, TOWNSEND, DE 19734-0546
PO BOX 547, TOWNSEND, DE 19734-0547
PO BOX 548, TOWNSEND, DE 19734-0548
PO BOX 549, TOWNSEND, DE 19734-0549
PO BOX 550, TOWNSEND, DE 19734-0550
PO BOX 551, TOWNSEND, DE 19734-0551
PO BOX 552, TOWNSEND, DE 19734-0552
PO BOX 553, TOWNSEND, DE 19734-0553
PO BOX 554, TOWNSEND, DE 19734-0554
PO BOX 555, TOWNSEND, DE 19734-0555
PO BOX 556, TOWNSEND, DE 19734-0556
PO BOX 557, TOWNSEND, DE 19734-0557
PO BOX 558, TOWNSEND, DE 19734-0558
PO BOX 559, TOWNSEND, DE 19734-0559
PO BOX 560, TOWNSEND, DE 19734-0560
PO BOX 561, TOWNSEND, DE 19734-0561
PO BOX 562, TOWNSEND, DE 19734-0562
PO BOX 563, TOWNSEND, DE 19734-0563
PO BOX 564, TOWNSEND, DE 19734-0564
PO BOX 565, TOWNSEND, DE 19734-0565
PO BOX 566, TOWNSEND, DE 19734-0566
PO BOX 567, TOWNSEND, DE 19734-0567
PO BOX 568, TOWNSEND, DE 19734-0568
PO BOX 569, TOWNSEND, DE 19734-0569
PO BOX 570, TOWNSEND, DE 19734-0570
PO BOX 571, TOWNSEND, DE 19734-0571
PO BOX 572, TOWNSEND, DE 19734-0572
PO BOX 573, TOWNSEND, DE 19734-0573
PO BOX 574, TOWNSEND, DE 19734-0574
PO BOX 575, TOWNSEND, DE 19734-0575
PO BOX 576, TOWNSEND, DE 19734-0576
PO BOX 577, TOWNSEND, DE 19734-0577
PO BOX 578, TOWNSEND, DE 19734-0578
PO BOX 579, TOWNSEND, DE 19734-0579
PO BOX 580, TOWNSEND, DE 19734-0580
PO BOX 581, TOWNSEND, DE 19734-0581
PO BOX 582, TOWNSEND, DE 19734-0582
PO BOX 583, TOWNSEND, DE 19734-0583
PO BOX 584, TOWNSEND, DE 19734-0584
PO BOX 585, TOWNSEND, DE 19734-0585
PO BOX 586, TOWNSEND, DE 19734-0586
PO BOX 587, TOWNSEND, DE 19734-0587
PO BOX 588, TOWNSEND, DE 19734-0588
PO BOX 589, TOWNSEND, DE 19734-0589
PO BOX 590, TOWNSEND, DE 19734-0590
PO BOX 591, TOWNSEND, DE 19734-0591
PO BOX 592, TOWNSEND, DE 19734-0592
PO BOX 593, TOWNSEND, DE 19734-0593
PO BOX 594, TOWNSEND, DE 19734-0594
PO BOX 595, TOWNSEND, DE 19734-0595
PO BOX 596, TOWNSEND, DE 19734-0596
PO BOX 597, TOWNSEND, DE 19734-0597
PO BOX 598, TOWNSEND, DE 19734-0598
PO BOX 599, TOWNSEND, DE 19734-0599
PO BOX 600, TOWNSEND, DE 19734-0600
PO BOX 601, TOWNSEND, DE 19734-0601
PO BOX 602, TOWNSEND, DE 19734-0602
PO BOX 603, TOWNSEND, DE 19734-0603
PO BOX 604, TOWNSEND, DE 19734-0604
PO BOX 605, TOWNSEND, DE 19734-0605
PO BOX 606, TOWNSEND, DE 19734-0606
PO BOX 607, TOWNSEND, DE 19734-0607
PO BOX 608, TOWNSEND, DE 19734-0608
PO BOX 609, TOWNSEND, DE 19734-0609
PO BOX 610, TOWNSEND, DE 19734-0610
PO BOX 611, TOWNSEND, DE 19734-0611
PO BOX 612, TOWNSEND, DE 19734-0612
PO BOX 613, TOWNSEND, DE 19734-0613
PO BOX 614, TOWNSEND, DE 19734-0614
PO BOX 615, TOWNSEND, DE 19734-0615
PO BOX 616, TOWNSEND, DE 19734-0616
PO BOX 617, TOWNSEND, DE 19734-0617
PO BOX 618, TOWNSEND, DE 19734-0618
PO BOX 619, TOWNSEND, DE 19734-0619
PO BOX 620, TOWNSEND, DE 19734-0620
PO BOX 621, TOWNSEND, DE 19734-0621
PO BOX 622, TOWNSEND, DE 19734-0622
PO BOX 623, TOWNSEND, DE 19734-0623
PO BOX 624, TOWNSEND, DE 19734-0624
PO BOX 625, TOWNSEND, DE 19734-0625
PO BOX 626, TOWNSEND, DE 19734-0626
PO BOX 627, TOWNSEND, DE 19734-0627
PO BOX 628, TOWNSEND, DE 19734-0628
PO BOX 629, TOWNSEND, DE 19734-0629
PO BOX 630, TOWNSEND, DE 19734-0630
PO BOX 631, TOWNSEND, DE 19734-0631
PO BOX 632, TOWNSEND, DE 19734-0632
PO BOX 633, TOWNSEND, DE 19734-0633
PO BOX 634, TOWNSEND, DE 19734-0634
PO BOX 635, TOWNSEND, DE 19734-0635
PO BOX 636, TOWNSEND, DE 19734-0636
PO BOX 637, TOWNSEND, DE 19734-0637
PO BOX 638, TOWNSEND, DE 19734-0638
PO BOX 639, TOWNSEND, DE 19734-0639
PO BOX 640, TOWNSEND, DE 19734-0640
PO BOX 641, TOWNSEND, DE 19734-0641
PO BOX 642, TOWNSEND, DE 19734-0642
PO BOX 643, TOWNSEND, DE 19734-0643
PO BOX 644, TOWNSEND, DE 19734-0644
PO BOX 645, TOWNSEND, DE 19734-0645
PO BOX 646, TOWNSEND, DE 19734-0646
PO BOX 647, TOWNSEND, DE 19734-0647
PO BOX 648, TOWNSEND, DE 19734-0648
PO BOX 649, TOWNSEND, DE 19734-0649
PO BOX 650, TOWNSEND, DE 19734-0650
PO BOX 651, TOWNSEND, DE 19734-0651
PO BOX 652, TOWNSEND, DE 19734-0652
PO BOX 653, TOWNSEND, DE 19734-0653
PO BOX 654, TOWNSEND, DE 19734-0654
PO BOX 655, TOWNSEND, DE 19734-0655
PO BOX 656, TOWNSEND, DE 19734-0656
PO BOX 657, TOWNSEND, DE 19734-0657
PO BOX 658, TOWNSEND, DE 19734-0658
PO BOX 659, TOWNSEND, DE 19734-0659
PO BOX 660, TOWNSEND, DE 19734-0660
PO BOX 661, TOWNSEND, DE 19734-0661
PO BOX 662, TOWNSEND, DE 19734-0662
PO BOX 663, TOWNSEND, DE 19734-0663
PO BOX 664, TOWNSEND, DE 19734-0664
PO BOX 665, TOWNSEND, DE 19734-0665
PO BOX 666, TOWNSEND, DE 19734-0666
PO BOX 667, TOWNSEND, DE 19734-0667
PO BOX 668, TOWNSEND, DE 19734-0668
PO BOX 669, TOWNSEND, DE 19734-0669
PO BOX 670, TOWNSEND, DE 19734-0670
PO BOX 671, TOWNSEND, DE 19734-0671
PO BOX 672, TOWNSEND, DE 19734-0672
PO BOX 673, TOWNSEND, DE 19734-0673
PO BOX 674, TOWNSEND, DE 19734-0674
PO BOX 675, TOWNSEND, DE 19734-0675
PO BOX 676, TOWNSEND, DE 19734-0676
PO BOX 677, TOWNSEND, DE 19734-0677
PO BOX 678, TOWNSEND, DE 19734-0678
PO BOX 679, TOWNSEND, DE 19734-0679
PO BOX 680, TOWNSEND, DE 19734-0680
PO BOX 681, TOWNSEND, DE 19734-0681
PO BOX 682, TOWNSEND, DE 19734-0682
PO BOX 683, TOWNSEND, DE 19734-0683
PO BOX 684, TOWNSEND, DE 19734-0684
PO BOX 685, TOWNSEND, DE 19734-0685
PO BOX 686, TOWNSEND, DE 19734-0686
PO BOX 687, TOWNSEND, DE 19734-0687
PO BOX 688, TOWNSEND, DE 19734-0688
PO BOX 689, TOWNSEND, DE 19734-0689
PO BOX 690, TOWNSEND, DE 19734-0690
PO BOX 691, TOWNSEND, DE 19734-0691
PO BOX 692, TOWNSEND, DE 19734-0692
PO BOX 693, TOWNSEND, DE 19734-0693
PO BOX 694, TOWNSEND, DE 19734-0694
PO BOX 695, TOWNSEND, DE 19734-0695
PO BOX 696, TOWNSEND, DE 19734-0696
PO BOX 697, TOWNSEND, DE 19734-0697
PO BOX 698, TOWNSEND, DE 19734-0698
PO BOX 699, TOWNSEND, DE 19734-0699
PO BOX 700, TOWNSEND, DE 19734-0700
PO BOX 701, TOWNSEND, DE 19734-0701
PO BOX 702, TOWNSEND, DE 19734-0702
PO BOX 703, TOWNSEND, DE 19734-0703
PO BOX 704, TOWNSEND, DE 19734-0704
PO BOX 705, TOWNSEND, DE 19734-0705
PO BOX 706, TOWNSEND, DE 19734-0706
PO BOX 707, TOWNSEND, DE 19734-0707
PO BOX 708, TOWNSEND, DE 19734-0708
PO BOX 709, TOWNSEND, DE 19734-0709
PO BOX 710, TOWNSEND, DE 19734-0710
PO BOX 711, TOWNSEND, DE 19734-0711
PO BOX 712, TOWNSEND, DE 19734-0712
PO BOX 713, TOWNSEND, DE 19734-0713
PO BOX 714, TOWNSEND, DE 19734-0714
PO BOX 715, TOWNSEND, DE 19734-0715
PO BOX 716, TOWNSEND, DE 19734-0716
PO BOX 717, TOWNSEND, DE 19734-0717
PO BOX 718, TOWNSEND, DE 19734-0718
PO BOX 719, TOWNSEND, DE 19734-0719
PO BOX 720, TOWNSEND, DE 19734-0720
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