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 631, COLORADO SPRINGS, CO 80901-0631
PO BOX 632, COLORADO SPRINGS, CO 80901-0632
PO BOX 633, COLORADO SPRINGS, CO 80901-0633
PO BOX 634, COLORADO SPRINGS, CO 80901-0634
PO BOX 635, COLORADO SPRINGS, CO 80901-0635
PO BOX 636, COLORADO SPRINGS, CO 80901-0636
PO BOX 637, COLORADO SPRINGS, CO 80901-0637
PO BOX 638, COLORADO SPRINGS, CO 80901-0638
PO BOX 639, COLORADO SPRINGS, CO 80901-0639
PO BOX 640, COLORADO SPRINGS, CO 80901-0640
PO BOX 641, COLORADO SPRINGS, CO 80901-0641
PO BOX 642, COLORADO SPRINGS, CO 80901-0642
PO BOX 643, COLORADO SPRINGS, CO 80901-0643
PO BOX 644, COLORADO SPRINGS, CO 80901-0644
PO BOX 645, COLORADO SPRINGS, CO 80901-0645
PO BOX 646, COLORADO SPRINGS, CO 80901-0646
PO BOX 647, COLORADO SPRINGS, CO 80901-0647
PO BOX 648, COLORADO SPRINGS, CO 80901-0648
PO BOX 649, COLORADO SPRINGS, CO 80901-0649
PO BOX 650, COLORADO SPRINGS, CO 80901-0650
PO BOX 651, COLORADO SPRINGS, CO 80901-0651
PO BOX 652, COLORADO SPRINGS, CO 80901-0652
PO BOX 653, COLORADO SPRINGS, CO 80901-0653
PO BOX 654, COLORADO SPRINGS, CO 80901-0654
PO BOX 655, COLORADO SPRINGS, CO 80901-0655
PO BOX 656, COLORADO SPRINGS, CO 80901-0656
PO BOX 657, COLORADO SPRINGS, CO 80901-0657
PO BOX 658, COLORADO SPRINGS, CO 80901-0658
PO BOX 659, COLORADO SPRINGS, CO 80901-0659
PO BOX 660, COLORADO SPRINGS, CO 80901-0660
PO BOX 661, COLORADO SPRINGS, CO 80901-0661
PO BOX 662, COLORADO SPRINGS, CO 80901-0662
PO BOX 663, COLORADO SPRINGS, CO 80901-0663
PO BOX 664, COLORADO SPRINGS, CO 80901-0664
PO BOX 665, COLORADO SPRINGS, CO 80901-0665
PO BOX 666, COLORADO SPRINGS, CO 80901-0666
PO BOX 667, COLORADO SPRINGS, CO 80901-0667
PO BOX 668, COLORADO SPRINGS, CO 80901-0668
PO BOX 669, COLORADO SPRINGS, CO 80901-0669
PO BOX 670, COLORADO SPRINGS, CO 80901-0670
PO BOX 671, COLORADO SPRINGS, CO 80901-0671
PO BOX 672, COLORADO SPRINGS, CO 80901-0672
PO BOX 673, COLORADO SPRINGS, CO 80901-0673
PO BOX 674, COLORADO SPRINGS, CO 80901-0674
PO BOX 675, COLORADO SPRINGS, CO 80901-0675
PO BOX 676, COLORADO SPRINGS, CO 80901-0676
PO BOX 677, COLORADO SPRINGS, CO 80901-0677
PO BOX 678, COLORADO SPRINGS, CO 80901-0678
PO BOX 679, COLORADO SPRINGS, CO 80901-0679
PO BOX 680, COLORADO SPRINGS, CO 80901-0680
PO BOX 681, COLORADO SPRINGS, CO 80901-0681
PO BOX 682, COLORADO SPRINGS, CO 80901-0682
PO BOX 683, COLORADO SPRINGS, CO 80901-0683
PO BOX 684, COLORADO SPRINGS, CO 80901-0684
PO BOX 685, COLORADO SPRINGS, CO 80901-0685
PO BOX 686, COLORADO SPRINGS, CO 80901-0686
PO BOX 687, COLORADO SPRINGS, CO 80901-0687
PO BOX 688, COLORADO SPRINGS, CO 80901-0688
PO BOX 689, COLORADO SPRINGS, CO 80901-0689
PO BOX 690, COLORADO SPRINGS, CO 80901-0690
PO BOX 691, COLORADO SPRINGS, CO 80901-0691
PO BOX 692, COLORADO SPRINGS, CO 80901-0692
PO BOX 693, COLORADO SPRINGS, CO 80901-0693
PO BOX 694, COLORADO SPRINGS, CO 80901-0694
PO BOX 695, COLORADO SPRINGS, CO 80901-0695
PO BOX 696, COLORADO SPRINGS, CO 80901-0696
PO BOX 697, COLORADO SPRINGS, CO 80901-0697
PO BOX 698, COLORADO SPRINGS, CO 80901-0698
PO BOX 699, COLORADO SPRINGS, CO 80901-0699
PO BOX 700, COLORADO SPRINGS, CO 80901-0700
PO BOX 701, COLORADO SPRINGS, CO 80901-0701
PO BOX 702, COLORADO SPRINGS, CO 80901-0702
PO BOX 703, COLORADO SPRINGS, CO 80901-0703
PO BOX 704, COLORADO SPRINGS, CO 80901-0704
PO BOX 705, COLORADO SPRINGS, CO 80901-0705
PO BOX 706, COLORADO SPRINGS, CO 80901-0706
PO BOX 707, COLORADO SPRINGS, CO 80901-0707
PO BOX 708, COLORADO SPRINGS, CO 80901-0708
PO BOX 709, COLORADO SPRINGS, CO 80901-0709
PO BOX 710, COLORADO SPRINGS, CO 80901-0710
PO BOX 711, COLORADO SPRINGS, CO 80901-0711
PO BOX 712, COLORADO SPRINGS, CO 80901-0712
PO BOX 713, COLORADO SPRINGS, CO 80901-0713
PO BOX 714, COLORADO SPRINGS, CO 80901-0714
PO BOX 715, COLORADO SPRINGS, CO 80901-0715
PO BOX 716, COLORADO SPRINGS, CO 80901-0716
PO BOX 717, COLORADO SPRINGS, CO 80901-0717
PO BOX 718, COLORADO SPRINGS, CO 80901-0718
PO BOX 719, COLORADO SPRINGS, CO 80901-0719
PO BOX 720, COLORADO SPRINGS, CO 80901-0720
PO BOX 721, COLORADO SPRINGS, CO 80901-0721
PO BOX 722, COLORADO SPRINGS, CO 80901-0722
PO BOX 723, COLORADO SPRINGS, CO 80901-0723
PO BOX 724, COLORADO SPRINGS, CO 80901-0724
PO BOX 725, COLORADO SPRINGS, CO 80901-0725
PO BOX 726, COLORADO SPRINGS, CO 80901-0726
PO BOX 727, COLORADO SPRINGS, CO 80901-0727
PO BOX 728, COLORADO SPRINGS, CO 80901-0728
PO BOX 729, COLORADO SPRINGS, CO 80901-0729
PO BOX 730, COLORADO SPRINGS, CO 80901-0730
PO BOX 731, COLORADO SPRINGS, CO 80901-0731
PO BOX 732, COLORADO SPRINGS, CO 80901-0732
PO BOX 733, COLORADO SPRINGS, CO 80901-0733
PO BOX 734, COLORADO SPRINGS, CO 80901-0734
PO BOX 735, COLORADO SPRINGS, CO 80901-0735
PO BOX 736, COLORADO SPRINGS, CO 80901-0736
PO BOX 737, COLORADO SPRINGS, CO 80901-0737
PO BOX 738, COLORADO SPRINGS, CO 80901-0738
PO BOX 739, COLORADO SPRINGS, CO 80901-0739
PO BOX 740, COLORADO SPRINGS, CO 80901-0740
PO BOX 741, COLORADO SPRINGS, CO 80901-0741
PO BOX 742, COLORADO SPRINGS, CO 80901-0742
PO BOX 743, COLORADO SPRINGS, CO 80901-0743
PO BOX 744, COLORADO SPRINGS, CO 80901-0744
PO BOX 745, COLORADO SPRINGS, CO 80901-0745
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