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 661, UPPER MARLBORO, MD 20773-0661
PO BOX 662, UPPER MARLBORO, MD 20773-0662
PO BOX 663, UPPER MARLBORO, MD 20773-0663
PO BOX 664, UPPER MARLBORO, MD 20773-0664
PO BOX 665, UPPER MARLBORO, MD 20773-0665
PO BOX 666, UPPER MARLBORO, MD 20773-0666
PO BOX 667, UPPER MARLBORO, MD 20773-0667
PO BOX 668, UPPER MARLBORO, MD 20773-0668
PO BOX 669, UPPER MARLBORO, MD 20773-0669
PO BOX 670, UPPER MARLBORO, MD 20773-0670
PO BOX 671, UPPER MARLBORO, MD 20773-0671
PO BOX 672, UPPER MARLBORO, MD 20773-0672
PO BOX 673, UPPER MARLBORO, MD 20773-0673
PO BOX 674, UPPER MARLBORO, MD 20773-0674
PO BOX 675, UPPER MARLBORO, MD 20773-0675
PO BOX 676, UPPER MARLBORO, MD 20773-0676
PO BOX 677, UPPER MARLBORO, MD 20773-0677
PO BOX 678, UPPER MARLBORO, MD 20773-0678
PO BOX 679, UPPER MARLBORO, MD 20773-0679
PO BOX 680, UPPER MARLBORO, MD 20773-0680
PO BOX 681, UPPER MARLBORO, MD 20773-0681
PO BOX 682, UPPER MARLBORO, MD 20773-0682
PO BOX 683, UPPER MARLBORO, MD 20773-0683
PO BOX 684, UPPER MARLBORO, MD 20773-0684
PO BOX 685, UPPER MARLBORO, MD 20773-0685
PO BOX 686, UPPER MARLBORO, MD 20773-0686
PO BOX 687, UPPER MARLBORO, MD 20773-0687
PO BOX 688, UPPER MARLBORO, MD 20773-0688
PO BOX 689, UPPER MARLBORO, MD 20773-0689
PO BOX 690, UPPER MARLBORO, MD 20773-0690
PO BOX 691, UPPER MARLBORO, MD 20773-0691
PO BOX 692, UPPER MARLBORO, MD 20773-0692
PO BOX 693, UPPER MARLBORO, MD 20773-0693
PO BOX 694, UPPER MARLBORO, MD 20773-0694
PO BOX 695, UPPER MARLBORO, MD 20773-0695
PO BOX 696, UPPER MARLBORO, MD 20773-0696
PO BOX 697, UPPER MARLBORO, MD 20773-0697
PO BOX 698, UPPER MARLBORO, MD 20773-0698
PO BOX 699, UPPER MARLBORO, MD 20773-0699
PO BOX 700, UPPER MARLBORO, MD 20773-0700
PO BOX 701, UPPER MARLBORO, MD 20773-0701
PO BOX 702, UPPER MARLBORO, MD 20773-0702
PO BOX 703, UPPER MARLBORO, MD 20773-0703
PO BOX 704, UPPER MARLBORO, MD 20773-0704
PO BOX 705, UPPER MARLBORO, MD 20773-0705
PO BOX 706, UPPER MARLBORO, MD 20773-0706
PO BOX 707, UPPER MARLBORO, MD 20773-0707
PO BOX 708, UPPER MARLBORO, MD 20773-0708
PO BOX 709, UPPER MARLBORO, MD 20773-0709
PO BOX 710, UPPER MARLBORO, MD 20773-0710
PO BOX 711, UPPER MARLBORO, MD 20773-0711
PO BOX 712, UPPER MARLBORO, MD 20773-0712
PO BOX 713, UPPER MARLBORO, MD 20773-0713
PO BOX 714, UPPER MARLBORO, MD 20773-0714
PO BOX 715, UPPER MARLBORO, MD 20773-0715
PO BOX 716, UPPER MARLBORO, MD 20773-0716
PO BOX 717, UPPER MARLBORO, MD 20773-0717
PO BOX 718, UPPER MARLBORO, MD 20773-0718
PO BOX 719, UPPER MARLBORO, MD 20773-0719
PO BOX 720, UPPER MARLBORO, MD 20773-0720
PO BOX 721, UPPER MARLBORO, MD 20773-0721
PO BOX 722, UPPER MARLBORO, MD 20773-0722
PO BOX 723, UPPER MARLBORO, MD 20773-0723
PO BOX 724, UPPER MARLBORO, MD 20773-0724
PO BOX 725, UPPER MARLBORO, MD 20773-0725
PO BOX 726, UPPER MARLBORO, MD 20773-0726
PO BOX 727, UPPER MARLBORO, MD 20773-0727
PO BOX 728, UPPER MARLBORO, MD 20773-0728
PO BOX 729, UPPER MARLBORO, MD 20773-0729
PO BOX 730, UPPER MARLBORO, MD 20773-0730
PO BOX 731, UPPER MARLBORO, MD 20773-0731
PO BOX 732, UPPER MARLBORO, MD 20773-0732
PO BOX 733, UPPER MARLBORO, MD 20773-0733
PO BOX 734, UPPER MARLBORO, MD 20773-0734
PO BOX 735, UPPER MARLBORO, MD 20773-0735
PO BOX 736, UPPER MARLBORO, MD 20773-0736
PO BOX 737, UPPER MARLBORO, MD 20773-0737
PO BOX 738, UPPER MARLBORO, MD 20773-0738
PO BOX 739, UPPER MARLBORO, MD 20773-0739
PO BOX 740, UPPER MARLBORO, MD 20773-0740
PO BOX 741, UPPER MARLBORO, MD 20773-0741
PO BOX 742, UPPER MARLBORO, MD 20773-0742
PO BOX 743, UPPER MARLBORO, MD 20773-0743
PO BOX 744, UPPER MARLBORO, MD 20773-0744
PO BOX 745, UPPER MARLBORO, MD 20773-0745
PO BOX 746, UPPER MARLBORO, MD 20773-0746
PO BOX 747, UPPER MARLBORO, MD 20773-0747
PO BOX 748, UPPER MARLBORO, MD 20773-0748
PO BOX 749, UPPER MARLBORO, MD 20773-0749
PO BOX 750, UPPER MARLBORO, MD 20773-0750
PO BOX 751, UPPER MARLBORO, MD 20773-0751
PO BOX 752, UPPER MARLBORO, MD 20773-0752
PO BOX 753, UPPER MARLBORO, MD 20773-0753
PO BOX 754, UPPER MARLBORO, MD 20773-0754
PO BOX 755, UPPER MARLBORO, MD 20773-0755
PO BOX 756, UPPER MARLBORO, MD 20773-0756
PO BOX 757, UPPER MARLBORO, MD 20773-0757
PO BOX 758, UPPER MARLBORO, MD 20773-0758
PO BOX 759, UPPER MARLBORO, MD 20773-0759
PO BOX 760, UPPER MARLBORO, MD 20773-0760
PO BOX 761, UPPER MARLBORO, MD 20773-0761
PO BOX 762, UPPER MARLBORO, MD 20773-0762
PO BOX 763, UPPER MARLBORO, MD 20773-0763
PO BOX 764, UPPER MARLBORO, MD 20773-0764
PO BOX 765, UPPER MARLBORO, MD 20773-0765
PO BOX 766, UPPER MARLBORO, MD 20773-0766
PO BOX 767, UPPER MARLBORO, MD 20773-0767
PO BOX 768, UPPER MARLBORO, MD 20773-0768
PO BOX 769, UPPER MARLBORO, MD 20773-0769
PO BOX 770, UPPER MARLBORO, MD 20773-0770
PO BOX 771, UPPER MARLBORO, MD 20773-0771
PO BOX 772, UPPER MARLBORO, MD 20773-0772
PO BOX 773, UPPER MARLBORO, MD 20773-0773
PO BOX 774, UPPER MARLBORO, MD 20773-0774
PO BOX 775, UPPER MARLBORO, MD 20773-0775
PO BOX 776, UPPER MARLBORO, MD 20773-0776
PO BOX 777, UPPER MARLBORO, MD 20773-0777
PO BOX 778, UPPER MARLBORO, MD 20773-0778
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