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 600, PORTLAND, CT 06480-0600
PO BOX 601, PORTLAND, CT 06480-0601
PO BOX 602, PORTLAND, CT 06480-0602
PO BOX 603, PORTLAND, CT 06480-0603
PO BOX 604, PORTLAND, CT 06480-0604
PO BOX 605, PORTLAND, CT 06480-0605
PO BOX 606, PORTLAND, CT 06480-0606
PO BOX 607, PORTLAND, CT 06480-0607
PO BOX 608, PORTLAND, CT 06480-0608
PO BOX 609, PORTLAND, CT 06480-0609
PO BOX 610, PORTLAND, CT 06480-0610
PO BOX 611, PORTLAND, CT 06480-0611
PO BOX 612, PORTLAND, CT 06480-0612
PO BOX 613, PORTLAND, CT 06480-0613
PO BOX 614, PORTLAND, CT 06480-0614
PO BOX 615, PORTLAND, CT 06480-0615
PO BOX 616, PORTLAND, CT 06480-0616
PO BOX 617, PORTLAND, CT 06480-0617
PO BOX 618, PORTLAND, CT 06480-0618
PO BOX 619, PORTLAND, CT 06480-0619
PO BOX 620, PORTLAND, CT 06480-0620
PO BOX 621, PORTLAND, CT 06480-0621
PO BOX 622, PORTLAND, CT 06480-0622
PO BOX 623, PORTLAND, CT 06480-0623
PO BOX 624, PORTLAND, CT 06480-0624
PO BOX 625, PORTLAND, CT 06480-0625
PO BOX 626, PORTLAND, CT 06480-0626
PO BOX 627, PORTLAND, CT 06480-0627
PO BOX 628, PORTLAND, CT 06480-0628
PO BOX 629, PORTLAND, CT 06480-0629
PO BOX 630, PORTLAND, CT 06480-0630
PO BOX 631, PORTLAND, CT 06480-0631
PO BOX 632, PORTLAND, CT 06480-0632
PO BOX 633, PORTLAND, CT 06480-0633
PO BOX 634, PORTLAND, CT 06480-0634
PO BOX 635, PORTLAND, CT 06480-0635
PO BOX 636, PORTLAND, CT 06480-0636
PO BOX 637, PORTLAND, CT 06480-0637
PO BOX 638, PORTLAND, CT 06480-0638
PO BOX 639, PORTLAND, CT 06480-0639
PO BOX 640, PORTLAND, CT 06480-0640
PO BOX 641, PORTLAND, CT 06480-0641
PO BOX 642, PORTLAND, CT 06480-0642
PO BOX 643, PORTLAND, CT 06480-0643
PO BOX 644, PORTLAND, CT 06480-0644
PO BOX 645, PORTLAND, CT 06480-0645
PO BOX 646, PORTLAND, CT 06480-0646
PO BOX 647, PORTLAND, CT 06480-0647
PO BOX 648, PORTLAND, CT 06480-0648
PO BOX 649, PORTLAND, CT 06480-0649
PO BOX 650, PORTLAND, CT 06480-0650
PO BOX 651, PORTLAND, CT 06480-0651
PO BOX 652, PORTLAND, CT 06480-0652
PO BOX 653, PORTLAND, CT 06480-0653
PO BOX 654, PORTLAND, CT 06480-0654
PO BOX 655, PORTLAND, CT 06480-0655
PO BOX 656, PORTLAND, CT 06480-0656
PO BOX 657, PORTLAND, CT 06480-0657
PO BOX 658, PORTLAND, CT 06480-0658
PO BOX 659, PORTLAND, CT 06480-0659
PO BOX 660, PORTLAND, CT 06480-0660
PO BOX 661, PORTLAND, CT 06480-0661
PO BOX 662, PORTLAND, CT 06480-0662
PO BOX 663, PORTLAND, CT 06480-0663
PO BOX 664, PORTLAND, CT 06480-0664
PO BOX 665, PORTLAND, CT 06480-0665
PO BOX 666, PORTLAND, CT 06480-0666
PO BOX 667, PORTLAND, CT 06480-0667
PO BOX 668, PORTLAND, CT 06480-0668
PO BOX 669, PORTLAND, CT 06480-0669
PO BOX 670, PORTLAND, CT 06480-0670
PO BOX 671, PORTLAND, CT 06480-0671
PO BOX 672, PORTLAND, CT 06480-0672
PO BOX 673, PORTLAND, CT 06480-0673
PO BOX 674, PORTLAND, CT 06480-0674
PO BOX 675, PORTLAND, CT 06480-0675
PO BOX 676, PORTLAND, CT 06480-0676
PO BOX 677, PORTLAND, CT 06480-0677
PO BOX 678, PORTLAND, CT 06480-0678
PO BOX 679, PORTLAND, CT 06480-0679
PO BOX 680, PORTLAND, CT 06480-0680
PO BOX 681, PORTLAND, CT 06480-0681
PO BOX 682, PORTLAND, CT 06480-0682
PO BOX 683, PORTLAND, CT 06480-0683
PO BOX 684, PORTLAND, CT 06480-0684
PO BOX 685, PORTLAND, CT 06480-0685
PO BOX 686, PORTLAND, CT 06480-0686
PO BOX 687, PORTLAND, CT 06480-0687
PO BOX 688, PORTLAND, CT 06480-0688
PO BOX 689, PORTLAND, CT 06480-0689
PO BOX 690, PORTLAND, CT 06480-0690
PO BOX 691, PORTLAND, CT 06480-0691
PO BOX 692, PORTLAND, CT 06480-0692
PO BOX 693, PORTLAND, CT 06480-0693
PO BOX 694, PORTLAND, CT 06480-0694
PO BOX 695, PORTLAND, CT 06480-0695
PO BOX 696, PORTLAND, CT 06480-0696
PO BOX 697, PORTLAND, CT 06480-0697
PO BOX 698, PORTLAND, CT 06480-0698
PO BOX 699, PORTLAND, CT 06480-0699
PO BOX 700, PORTLAND, CT 06480-0700
PO BOX 701, PORTLAND, CT 06480-0701
PO BOX 702, PORTLAND, CT 06480-0702
PO BOX 703, PORTLAND, CT 06480-0703
PO BOX 704, PORTLAND, CT 06480-0704
PO BOX 705, PORTLAND, CT 06480-0705
PO BOX 706, PORTLAND, CT 06480-0706
PO BOX 707, PORTLAND, CT 06480-0707
PO BOX 708, PORTLAND, CT 06480-0708
PO BOX 709, PORTLAND, CT 06480-0709
PO BOX 710, PORTLAND, CT 06480-0710
PO BOX 711, PORTLAND, CT 06480-0711
PO BOX 712, PORTLAND, CT 06480-0712
PO BOX 713, PORTLAND, CT 06480-0713
PO BOX 714, PORTLAND, CT 06480-0714
PO BOX 715, PORTLAND, CT 06480-0715
PO BOX 716, PORTLAND, CT 06480-0716
PO BOX 717, PORTLAND, CT 06480-0717
PO BOX 718, PORTLAND, CT 06480-0718
PO BOX 719, PORTLAND, CT 06480-0719
PO BOX 720, PORTLAND, CT 06480-0720
PO BOX 721, PORTLAND, CT 06480-0721
PO BOX 722, PORTLAND, CT 06480-0722
PO BOX 723, PORTLAND, CT 06480-0723
PO BOX 724, PORTLAND, CT 06480-0724
PO BOX 725, PORTLAND, CT 06480-0725
PO BOX 726, PORTLAND, CT 06480-0726
PO BOX 727, PORTLAND, CT 06480-0727
PO BOX 728, PORTLAND, CT 06480-0728
PO BOX 729, PORTLAND, CT 06480-0729
PO BOX 730, PORTLAND, CT 06480-0730
PO BOX 731, PORTLAND, CT 06480-0731
PO BOX 732, PORTLAND, CT 06480-0732
PO BOX 733, PORTLAND, CT 06480-0733
PO BOX 734, PORTLAND, CT 06480-0734
PO BOX 735, PORTLAND, CT 06480-0735
PO BOX 736, PORTLAND, CT 06480-0736
PO BOX 737, PORTLAND, CT 06480-0737
PO BOX 738, PORTLAND, CT 06480-0738
PO BOX 739, PORTLAND, CT 06480-0739
PO BOX 740, PORTLAND, CT 06480-0740
PO BOX 741, PORTLAND, CT 06480-0741
PO BOX 742, PORTLAND, CT 06480-0742
PO BOX 743, PORTLAND, CT 06480-0743
PO BOX 744, PORTLAND, CT 06480-0744
PO BOX 745, PORTLAND, CT 06480-0745
PO BOX 746, PORTLAND, CT 06480-0746
PO BOX 747, PORTLAND, CT 06480-0747
PO BOX 748, PORTLAND, CT 06480-0748
PO BOX 749, PORTLAND, CT 06480-0749
PO BOX 750, PORTLAND, CT 06480-0750
PO BOX 751, PORTLAND, CT 06480-0751
PO BOX 752, PORTLAND, CT 06480-0752
PO BOX 753, PORTLAND, CT 06480-0753
PO BOX 754, PORTLAND, CT 06480-0754
PO BOX 755, PORTLAND, CT 06480-0755
PO BOX 756, PORTLAND, CT 06480-0756
PO BOX 757, PORTLAND, CT 06480-0757
PO BOX 758, PORTLAND, CT 06480-0758
PO BOX 759, PORTLAND, CT 06480-0759
PO BOX 760, PORTLAND, CT 06480-0760
PO BOX 761, PORTLAND, CT 06480-0761
PO BOX 762, PORTLAND, CT 06480-0762
PO BOX 763, PORTLAND, CT 06480-0763
PO BOX 764, PORTLAND, CT 06480-0764
PO BOX 765, PORTLAND, CT 06480-0765
PO BOX 766, PORTLAND, CT 06480-0766
PO BOX 767, PORTLAND, CT 06480-0767
PO BOX 768, PORTLAND, CT 06480-0768
PO BOX 769, PORTLAND, CT 06480-0769
PO BOX 770, PORTLAND, CT 06480-0770
PO BOX 771, PORTLAND, CT 06480-0771
PO BOX 772, PORTLAND, CT 06480-0772
PO BOX 773, PORTLAND, CT 06480-0773
PO BOX 774, PORTLAND, CT 06480-0774
PO BOX 775, PORTLAND, CT 06480-0775
PO BOX 776, PORTLAND, CT 06480-0776
PO BOX 777, PORTLAND, CT 06480-0777
PO BOX 778, PORTLAND, CT 06480-0778
PO BOX 779, PORTLAND, CT 06480-0779
PO BOX 780, PORTLAND, CT 06480-0780
PO BOX 781, PORTLAND, CT 06480-0781
PO BOX 782, PORTLAND, CT 06480-0782
PO BOX 783, PORTLAND, CT 06480-0783
PO BOX 784, PORTLAND, CT 06480-0784
PO BOX 785, PORTLAND, CT 06480-0785
PO BOX 786, PORTLAND, CT 06480-0786
PO BOX 787, PORTLAND, CT 06480-0787
PO BOX 788, PORTLAND, CT 06480-0788
PO BOX 789, PORTLAND, CT 06480-0789
PO BOX 790, PORTLAND, CT 06480-0790
PO BOX 791, PORTLAND, CT 06480-0791
PO BOX 792, PORTLAND, CT 06480-0792
PO BOX 793, PORTLAND, CT 06480-0793
PO BOX 794, PORTLAND, CT 06480-0794
PO BOX 795, PORTLAND, CT 06480-0795
PO BOX 796, PORTLAND, CT 06480-0796
PO BOX 797, PORTLAND, CT 06480-0797
PO BOX 798, PORTLAND, CT 06480-0798
PO BOX 799, PORTLAND, CT 06480-0799
PO BOX 800, PORTLAND, CT 06480-0800
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