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 601, CARROLLTON, VA 23314-0601
PO BOX 602, CARROLLTON, VA 23314-0602
PO BOX 603, CARROLLTON, VA 23314-0603
PO BOX 604, CARROLLTON, VA 23314-0604
PO BOX 605, CARROLLTON, VA 23314-0605
PO BOX 606, CARROLLTON, VA 23314-0606
PO BOX 607, CARROLLTON, VA 23314-0607
PO BOX 608, CARROLLTON, VA 23314-0608
PO BOX 609, CARROLLTON, VA 23314-0609
PO BOX 610, CARROLLTON, VA 23314-0610
PO BOX 611, CARROLLTON, VA 23314-0611
PO BOX 612, CARROLLTON, VA 23314-0612
PO BOX 613, CARROLLTON, VA 23314-0613
PO BOX 614, CARROLLTON, VA 23314-0614
PO BOX 615, CARROLLTON, VA 23314-0615
PO BOX 616, CARROLLTON, VA 23314-0616
PO BOX 617, CARROLLTON, VA 23314-0617
PO BOX 618, CARROLLTON, VA 23314-0618
PO BOX 619, CARROLLTON, VA 23314-0619
PO BOX 620, CARROLLTON, VA 23314-0620
PO BOX 621, CARROLLTON, VA 23314-0621
PO BOX 622, CARROLLTON, VA 23314-0622
PO BOX 623, CARROLLTON, VA 23314-0623
PO BOX 624, CARROLLTON, VA 23314-0624
PO BOX 625, CARROLLTON, VA 23314-0625
PO BOX 626, CARROLLTON, VA 23314-0626
PO BOX 627, CARROLLTON, VA 23314-0627
PO BOX 628, CARROLLTON, VA 23314-0628
PO BOX 629, CARROLLTON, VA 23314-0629
PO BOX 630, CARROLLTON, VA 23314-0630
PO BOX 631, CARROLLTON, VA 23314-0631
PO BOX 632, CARROLLTON, VA 23314-0632
PO BOX 633, CARROLLTON, VA 23314-0633
PO BOX 634, CARROLLTON, VA 23314-0634
PO BOX 635, CARROLLTON, VA 23314-0635
PO BOX 636, CARROLLTON, VA 23314-0636
PO BOX 637, CARROLLTON, VA 23314-0637
PO BOX 638, CARROLLTON, VA 23314-0638
PO BOX 639, CARROLLTON, VA 23314-0639
PO BOX 640, CARROLLTON, VA 23314-0640
PO BOX 641, CARROLLTON, VA 23314-0641
PO BOX 642, CARROLLTON, VA 23314-0642
PO BOX 643, CARROLLTON, VA 23314-0643
PO BOX 644, CARROLLTON, VA 23314-0644
PO BOX 645, CARROLLTON, VA 23314-0645
PO BOX 646, CARROLLTON, VA 23314-0646
PO BOX 647, CARROLLTON, VA 23314-0647
PO BOX 648, CARROLLTON, VA 23314-0648
PO BOX 649, CARROLLTON, VA 23314-0649
PO BOX 650, CARROLLTON, VA 23314-0650
PO BOX 651, CARROLLTON, VA 23314-0651
PO BOX 652, CARROLLTON, VA 23314-0652
PO BOX 653, CARROLLTON, VA 23314-0653
PO BOX 654, CARROLLTON, VA 23314-0654
PO BOX 655, CARROLLTON, VA 23314-0655
PO BOX 656, CARROLLTON, VA 23314-0656
PO BOX 657, CARROLLTON, VA 23314-0657
PO BOX 658, CARROLLTON, VA 23314-0658
PO BOX 659, CARROLLTON, VA 23314-0659
PO BOX 660, CARROLLTON, VA 23314-0660
PO BOX 661, CARROLLTON, VA 23314-0661
PO BOX 662, CARROLLTON, VA 23314-0662
PO BOX 663, CARROLLTON, VA 23314-0663
PO BOX 664, CARROLLTON, VA 23314-0664
PO BOX 665, CARROLLTON, VA 23314-0665
PO BOX 666, CARROLLTON, VA 23314-0666
PO BOX 667, CARROLLTON, VA 23314-0667
PO BOX 668, CARROLLTON, VA 23314-0668
PO BOX 669, CARROLLTON, VA 23314-0669
PO BOX 670, CARROLLTON, VA 23314-0670
PO BOX 671, CARROLLTON, VA 23314-0671
PO BOX 672, CARROLLTON, VA 23314-0672
PO BOX 673, CARROLLTON, VA 23314-0673
PO BOX 674, CARROLLTON, VA 23314-0674
PO BOX 675, CARROLLTON, VA 23314-0675
PO BOX 676, CARROLLTON, VA 23314-0676
PO BOX 677, CARROLLTON, VA 23314-0677
PO BOX 678, CARROLLTON, VA 23314-0678
PO BOX 679, CARROLLTON, VA 23314-0679
PO BOX 680, CARROLLTON, VA 23314-0680
PO BOX 681, CARROLLTON, VA 23314-0681
PO BOX 682, CARROLLTON, VA 23314-0682
PO BOX 683, CARROLLTON, VA 23314-0683
PO BOX 684, CARROLLTON, VA 23314-0684
PO BOX 685, CARROLLTON, VA 23314-0685
PO BOX 686, CARROLLTON, VA 23314-0686
PO BOX 687, CARROLLTON, VA 23314-0687
PO BOX 688, CARROLLTON, VA 23314-0688
PO BOX 689, CARROLLTON, VA 23314-0689
PO BOX 690, CARROLLTON, VA 23314-0690
PO BOX 691, CARROLLTON, VA 23314-0691
PO BOX 692, CARROLLTON, VA 23314-0692
PO BOX 693, CARROLLTON, VA 23314-0693
PO BOX 694, CARROLLTON, VA 23314-0694
PO BOX 695, CARROLLTON, VA 23314-0695
PO BOX 696, CARROLLTON, VA 23314-0696
PO BOX 697, CARROLLTON, VA 23314-0697
PO BOX 698, CARROLLTON, VA 23314-0698
PO BOX 699, CARROLLTON, VA 23314-0699
PO BOX 700, CARROLLTON, VA 23314-0700
PO BOX 701, CARROLLTON, VA 23314-0701
PO BOX 702, CARROLLTON, VA 23314-0702
PO BOX 703, CARROLLTON, VA 23314-0703
PO BOX 704, CARROLLTON, VA 23314-0704
PO BOX 705, CARROLLTON, VA 23314-0705
PO BOX 706, CARROLLTON, VA 23314-0706
PO BOX 707, CARROLLTON, VA 23314-0707
PO BOX 708, CARROLLTON, VA 23314-0708
PO BOX 709, CARROLLTON, VA 23314-0709
PO BOX 710, CARROLLTON, VA 23314-0710
PO BOX 711, CARROLLTON, VA 23314-0711
PO BOX 712, CARROLLTON, VA 23314-0712
PO BOX 713, CARROLLTON, VA 23314-0713
PO BOX 714, CARROLLTON, VA 23314-0714
PO BOX 715, CARROLLTON, VA 23314-0715
PO BOX 716, CARROLLTON, VA 23314-0716
PO BOX 717, CARROLLTON, VA 23314-0717
PO BOX 718, CARROLLTON, VA 23314-0718
PO BOX 719, CARROLLTON, VA 23314-0719
PO BOX 720, CARROLLTON, VA 23314-0720
PO BOX 721, CARROLLTON, VA 23314-0721
PO BOX 722, CARROLLTON, VA 23314-0722
PO BOX 723, CARROLLTON, VA 23314-0723
PO BOX 724, CARROLLTON, VA 23314-0724
PO BOX 725, CARROLLTON, VA 23314-0725
PO BOX 726, CARROLLTON, VA 23314-0726
PO BOX 727, CARROLLTON, VA 23314-0727
PO BOX 728, CARROLLTON, VA 23314-0728
PO BOX 729, CARROLLTON, VA 23314-0729
PO BOX 730, CARROLLTON, VA 23314-0730
PO BOX 731, CARROLLTON, VA 23314-0731
PO BOX 732, CARROLLTON, VA 23314-0732
PO BOX 733, CARROLLTON, VA 23314-0733
PO BOX 734, CARROLLTON, VA 23314-0734
PO BOX 735, CARROLLTON, VA 23314-0735
PO BOX 736, CARROLLTON, VA 23314-0736
PO BOX 737, CARROLLTON, VA 23314-0737
PO BOX 738, CARROLLTON, VA 23314-0738
PO BOX 739, CARROLLTON, VA 23314-0739
PO BOX 740, CARROLLTON, VA 23314-0740
PO BOX 741, CARROLLTON, VA 23314-0741
PO BOX 742, CARROLLTON, VA 23314-0742
PO BOX 743, CARROLLTON, VA 23314-0743
PO BOX 744, CARROLLTON, VA 23314-0744
PO BOX 745, CARROLLTON, VA 23314-0745
PO BOX 746, CARROLLTON, VA 23314-0746
PO BOX 747, CARROLLTON, VA 23314-0747
PO BOX 748, CARROLLTON, VA 23314-0748
PO BOX 749, CARROLLTON, VA 23314-0749
PO BOX 750, CARROLLTON, VA 23314-0750
PO BOX 751, CARROLLTON, VA 23314-0751
PO BOX 752, CARROLLTON, VA 23314-0752
PO BOX 753, CARROLLTON, VA 23314-0753
PO BOX 754, CARROLLTON, VA 23314-0754
PO BOX 755, CARROLLTON, VA 23314-0755
PO BOX 756, CARROLLTON, VA 23314-0756
PO BOX 757, CARROLLTON, VA 23314-0757
PO BOX 758, CARROLLTON, VA 23314-0758
PO BOX 759, CARROLLTON, VA 23314-0759
PO BOX 760, CARROLLTON, VA 23314-0760
PO BOX 761, CARROLLTON, VA 23314-0761
PO BOX 762, CARROLLTON, VA 23314-0762
PO BOX 763, CARROLLTON, VA 23314-0763
PO BOX 764, CARROLLTON, VA 23314-0764
PO BOX 765, CARROLLTON, VA 23314-0765
PO BOX 766, CARROLLTON, VA 23314-0766
PO BOX 767, CARROLLTON, VA 23314-0767
PO BOX 768, CARROLLTON, VA 23314-0768
PO BOX 769, CARROLLTON, VA 23314-0769
PO BOX 770, CARROLLTON, VA 23314-0770
PO BOX 771, CARROLLTON, VA 23314-0771
PO BOX 772, CARROLLTON, VA 23314-0772
PO BOX 773, CARROLLTON, VA 23314-0773
PO BOX 774, CARROLLTON, VA 23314-0774
PO BOX 775, CARROLLTON, VA 23314-0775
PO BOX 776, CARROLLTON, VA 23314-0776
PO BOX 777, CARROLLTON, VA 23314-0777
PO BOX 778, CARROLLTON, VA 23314-0778
PO BOX 779, CARROLLTON, VA 23314-0779
PO BOX 780, CARROLLTON, VA 23314-0780
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