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, GREAT VALLEY, NY 14741-0661
PO BOX 662, GREAT VALLEY, NY 14741-0662
PO BOX 663, GREAT VALLEY, NY 14741-0663
PO BOX 664, GREAT VALLEY, NY 14741-0664
PO BOX 665, GREAT VALLEY, NY 14741-0665
PO BOX 666, GREAT VALLEY, NY 14741-0666
PO BOX 667, GREAT VALLEY, NY 14741-0667
PO BOX 668, GREAT VALLEY, NY 14741-0668
PO BOX 669, GREAT VALLEY, NY 14741-0669
PO BOX 670, GREAT VALLEY, NY 14741-0670
PO BOX 671, GREAT VALLEY, NY 14741-0671
PO BOX 672, GREAT VALLEY, NY 14741-0672
PO BOX 673, GREAT VALLEY, NY 14741-0673
PO BOX 674, GREAT VALLEY, NY 14741-0674
PO BOX 675, GREAT VALLEY, NY 14741-0675
PO BOX 676, GREAT VALLEY, NY 14741-0676
PO BOX 677, GREAT VALLEY, NY 14741-0677
PO BOX 678, GREAT VALLEY, NY 14741-0678
PO BOX 679, GREAT VALLEY, NY 14741-0679
PO BOX 680, GREAT VALLEY, NY 14741-0680
PO BOX 681, GREAT VALLEY, NY 14741-0681
PO BOX 682, GREAT VALLEY, NY 14741-0682
PO BOX 683, GREAT VALLEY, NY 14741-0683
PO BOX 684, GREAT VALLEY, NY 14741-0684
PO BOX 685, GREAT VALLEY, NY 14741-0685
PO BOX 686, GREAT VALLEY, NY 14741-0686
PO BOX 687, GREAT VALLEY, NY 14741-0687
PO BOX 688, GREAT VALLEY, NY 14741-0688
PO BOX 689, GREAT VALLEY, NY 14741-0689
PO BOX 690, GREAT VALLEY, NY 14741-0690
PO BOX 691, GREAT VALLEY, NY 14741-0691
PO BOX 692, GREAT VALLEY, NY 14741-0692
PO BOX 693, GREAT VALLEY, NY 14741-0693
PO BOX 694, GREAT VALLEY, NY 14741-0694
PO BOX 695, GREAT VALLEY, NY 14741-0695
PO BOX 696, GREAT VALLEY, NY 14741-0696
PO BOX 697, GREAT VALLEY, NY 14741-0697
PO BOX 698, GREAT VALLEY, NY 14741-0698
PO BOX 699, GREAT VALLEY, NY 14741-0699
PO BOX 700, GREAT VALLEY, NY 14741-0700
PO BOX 701, GREAT VALLEY, NY 14741-0701
PO BOX 702, GREAT VALLEY, NY 14741-0702
PO BOX 703, GREAT VALLEY, NY 14741-0703
PO BOX 704, GREAT VALLEY, NY 14741-0704
PO BOX 705, GREAT VALLEY, NY 14741-0705
PO BOX 706, GREAT VALLEY, NY 14741-0706
PO BOX 707, GREAT VALLEY, NY 14741-0707
PO BOX 708, GREAT VALLEY, NY 14741-0708
PO BOX 709, GREAT VALLEY, NY 14741-0709
PO BOX 710, GREAT VALLEY, NY 14741-0710
PO BOX 711, GREAT VALLEY, NY 14741-0711
PO BOX 712, GREAT VALLEY, NY 14741-0712
PO BOX 713, GREAT VALLEY, NY 14741-0713
PO BOX 714, GREAT VALLEY, NY 14741-0714
PO BOX 715, GREAT VALLEY, NY 14741-0715
PO BOX 716, GREAT VALLEY, NY 14741-0716
PO BOX 717, GREAT VALLEY, NY 14741-0717
PO BOX 718, GREAT VALLEY, NY 14741-0718
PO BOX 719, GREAT VALLEY, NY 14741-0719
PO BOX 720, GREAT VALLEY, NY 14741-0720
PO BOX 721, GREAT VALLEY, NY 14741-0721
PO BOX 722, GREAT VALLEY, NY 14741-0722
PO BOX 723, GREAT VALLEY, NY 14741-0723
PO BOX 724, GREAT VALLEY, NY 14741-0724
PO BOX 725, GREAT VALLEY, NY 14741-0725
PO BOX 726, GREAT VALLEY, NY 14741-0726
PO BOX 727, GREAT VALLEY, NY 14741-0727
PO BOX 728, GREAT VALLEY, NY 14741-0728
PO BOX 729, GREAT VALLEY, NY 14741-0729
PO BOX 730, GREAT VALLEY, NY 14741-0730
PO BOX 731, GREAT VALLEY, NY 14741-0731
PO BOX 732, GREAT VALLEY, NY 14741-0732
PO BOX 733, GREAT VALLEY, NY 14741-0733
PO BOX 734, GREAT VALLEY, NY 14741-0734
PO BOX 735, GREAT VALLEY, NY 14741-0735
PO BOX 736, GREAT VALLEY, NY 14741-0736
PO BOX 737, GREAT VALLEY, NY 14741-0737
PO BOX 738, GREAT VALLEY, NY 14741-0738
PO BOX 739, GREAT VALLEY, NY 14741-0739
PO BOX 740, GREAT VALLEY, NY 14741-0740
PO BOX 741, GREAT VALLEY, NY 14741-0741
PO BOX 742, GREAT VALLEY, NY 14741-0742
PO BOX 743, GREAT VALLEY, NY 14741-0743
PO BOX 744, GREAT VALLEY, NY 14741-0744
PO BOX 745, GREAT VALLEY, NY 14741-0745
PO BOX 746, GREAT VALLEY, NY 14741-0746
PO BOX 747, GREAT VALLEY, NY 14741-0747
PO BOX 748, GREAT VALLEY, NY 14741-0748
PO BOX 749, GREAT VALLEY, NY 14741-0749
PO BOX 750, GREAT VALLEY, NY 14741-0750
PO BOX 751, GREAT VALLEY, NY 14741-0751
PO BOX 752, GREAT VALLEY, NY 14741-0752
PO BOX 753, GREAT VALLEY, NY 14741-0753
PO BOX 754, GREAT VALLEY, NY 14741-0754
PO BOX 755, GREAT VALLEY, NY 14741-0755
PO BOX 756, GREAT VALLEY, NY 14741-0756
PO BOX 757, GREAT VALLEY, NY 14741-0757
PO BOX 758, GREAT VALLEY, NY 14741-0758
PO BOX 759, GREAT VALLEY, NY 14741-0759
PO BOX 760, GREAT VALLEY, NY 14741-0760
PO BOX 761, GREAT VALLEY, NY 14741-0761
PO BOX 762, GREAT VALLEY, NY 14741-0762
PO BOX 763, GREAT VALLEY, NY 14741-0763
PO BOX 764, GREAT VALLEY, NY 14741-0764
PO BOX 765, GREAT VALLEY, NY 14741-0765
PO BOX 766, GREAT VALLEY, NY 14741-0766
PO BOX 767, GREAT VALLEY, NY 14741-0767
PO BOX 768, GREAT VALLEY, NY 14741-0768
PO BOX 769, GREAT VALLEY, NY 14741-0769
PO BOX 770, GREAT VALLEY, NY 14741-0770
PO BOX 771, GREAT VALLEY, NY 14741-0771
PO BOX 772, GREAT VALLEY, NY 14741-0772
PO BOX 773, GREAT VALLEY, NY 14741-0773
PO BOX 774, GREAT VALLEY, NY 14741-0774
PO BOX 775, GREAT VALLEY, NY 14741-0775
PO BOX 776, GREAT VALLEY, NY 14741-0776
PO BOX 777, GREAT VALLEY, NY 14741-0777
PO BOX 778, GREAT VALLEY, NY 14741-0778
PO BOX 779, GREAT VALLEY, NY 14741-0779
PO BOX 780, GREAT VALLEY, NY 14741-0780
PO BOX 781, GREAT VALLEY, NY 14741-0781
PO BOX 782, GREAT VALLEY, NY 14741-0782
PO BOX 783, GREAT VALLEY, NY 14741-0783
PO BOX 784, GREAT VALLEY, NY 14741-0784
PO BOX 785, GREAT VALLEY, NY 14741-0785
PO BOX 786, GREAT VALLEY, NY 14741-0786
PO BOX 787, GREAT VALLEY, NY 14741-0787
PO BOX 788, GREAT VALLEY, NY 14741-0788
PO BOX 789, GREAT VALLEY, NY 14741-0789
PO BOX 790, GREAT VALLEY, NY 14741-0790
PO BOX 791, GREAT VALLEY, NY 14741-0791
PO BOX 792, GREAT VALLEY, NY 14741-0792
PO BOX 793, GREAT VALLEY, NY 14741-0793
PO BOX 794, GREAT VALLEY, NY 14741-0794
PO BOX 795, GREAT VALLEY, NY 14741-0795
PO BOX 796, GREAT VALLEY, NY 14741-0796
PO BOX 797, GREAT VALLEY, NY 14741-0797
PO BOX 798, GREAT VALLEY, NY 14741-0798
PO BOX 799, GREAT VALLEY, NY 14741-0799
PO BOX 800, GREAT VALLEY, NY 14741-0800
PO BOX 801, GREAT VALLEY, NY 14741-0801
PO BOX 802, GREAT VALLEY, NY 14741-0802
PO BOX 803, GREAT VALLEY, NY 14741-0803
PO BOX 804, GREAT VALLEY, NY 14741-0804
PO BOX 805, GREAT VALLEY, NY 14741-0805
PO BOX 806, GREAT VALLEY, NY 14741-0806
PO BOX 807, GREAT VALLEY, NY 14741-0807
PO BOX 808, GREAT VALLEY, NY 14741-0808
PO BOX 809, GREAT VALLEY, NY 14741-0809
PO BOX 810, GREAT VALLEY, NY 14741-0810
PO BOX 811, GREAT VALLEY, NY 14741-0811
PO BOX 812, GREAT VALLEY, NY 14741-0812
PO BOX 813, GREAT VALLEY, NY 14741-0813
PO BOX 814, GREAT VALLEY, NY 14741-0814
PO BOX 815, GREAT VALLEY, NY 14741-0815
PO BOX 816, GREAT VALLEY, NY 14741-0816
PO BOX 817, GREAT VALLEY, NY 14741-0817
PO BOX 818, GREAT VALLEY, NY 14741-0818
PO BOX 819, GREAT VALLEY, NY 14741-0819
PO BOX 820, GREAT VALLEY, NY 14741-0820
PO BOX 821, GREAT VALLEY, NY 14741-0821
PO BOX 822, GREAT VALLEY, NY 14741-0822
PO BOX 823, GREAT VALLEY, NY 14741-0823
PO BOX 824, GREAT VALLEY, NY 14741-0824
PO BOX 825, GREAT VALLEY, NY 14741-0825
PO BOX 826, GREAT VALLEY, NY 14741-0826
PO BOX 827, GREAT VALLEY, NY 14741-0827
PO BOX 828, GREAT VALLEY, NY 14741-0828
PO BOX 829, GREAT VALLEY, NY 14741-0829
PO BOX 830, GREAT VALLEY, NY 14741-0830
PO BOX 831, GREAT VALLEY, NY 14741-0831
PO BOX 832, GREAT VALLEY, NY 14741-0832
PO BOX 833, GREAT VALLEY, NY 14741-0833
PO BOX 834, GREAT VALLEY, NY 14741-0834
PO BOX 835, GREAT VALLEY, NY 14741-0835
PO BOX 836, GREAT VALLEY, NY 14741-0836
PO BOX 837, GREAT VALLEY, NY 14741-0837
PO BOX 838, GREAT VALLEY, NY 14741-0838
PO BOX 839, GREAT VALLEY, NY 14741-0839
PO BOX 840, GREAT VALLEY, NY 14741-0840
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