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, GLENWOOD SPRINGS, CO 81602-0601
PO BOX 602, GLENWOOD SPRINGS, CO 81602-0602
PO BOX 603, GLENWOOD SPRINGS, CO 81602-0603
PO BOX 604, GLENWOOD SPRINGS, CO 81602-0604
PO BOX 605, GLENWOOD SPRINGS, CO 81602-0605
PO BOX 606, GLENWOOD SPRINGS, CO 81602-0606
PO BOX 607, GLENWOOD SPRINGS, CO 81602-0607
PO BOX 608, GLENWOOD SPRINGS, CO 81602-0608
PO BOX 609, GLENWOOD SPRINGS, CO 81602-0609
PO BOX 610, GLENWOOD SPRINGS, CO 81602-0610
PO BOX 611, GLENWOOD SPRINGS, CO 81602-0611
PO BOX 612, GLENWOOD SPRINGS, CO 81602-0612
PO BOX 613, GLENWOOD SPRINGS, CO 81602-0613
PO BOX 614, GLENWOOD SPRINGS, CO 81602-0614
PO BOX 615, GLENWOOD SPRINGS, CO 81602-0615
PO BOX 616, GLENWOOD SPRINGS, CO 81602-0616
PO BOX 617, GLENWOOD SPRINGS, CO 81602-0617
PO BOX 618, GLENWOOD SPRINGS, CO 81602-0618
PO BOX 619, GLENWOOD SPRINGS, CO 81602-0619
PO BOX 620, GLENWOOD SPRINGS, CO 81602-0620
PO BOX 621, GLENWOOD SPRINGS, CO 81602-0621
PO BOX 622, GLENWOOD SPRINGS, CO 81602-0622
PO BOX 623, GLENWOOD SPRINGS, CO 81602-0623
PO BOX 624, GLENWOOD SPRINGS, CO 81602-0624
PO BOX 625, GLENWOOD SPRINGS, CO 81602-0625
PO BOX 626, GLENWOOD SPRINGS, CO 81602-0626
PO BOX 627, GLENWOOD SPRINGS, CO 81602-0627
PO BOX 628, GLENWOOD SPRINGS, CO 81602-0628
PO BOX 629, GLENWOOD SPRINGS, CO 81602-0629
PO BOX 630, GLENWOOD SPRINGS, CO 81602-0630
PO BOX 631, GLENWOOD SPRINGS, CO 81602-0631
PO BOX 632, GLENWOOD SPRINGS, CO 81602-0632
PO BOX 633, GLENWOOD SPRINGS, CO 81602-0633
PO BOX 634, GLENWOOD SPRINGS, CO 81602-0634
PO BOX 635, GLENWOOD SPRINGS, CO 81602-0635
PO BOX 636, GLENWOOD SPRINGS, CO 81602-0636
PO BOX 637, GLENWOOD SPRINGS, CO 81602-0637
PO BOX 638, GLENWOOD SPRINGS, CO 81602-0638
PO BOX 639, GLENWOOD SPRINGS, CO 81602-0639
PO BOX 640, GLENWOOD SPRINGS, CO 81602-0640
PO BOX 641, GLENWOOD SPRINGS, CO 81602-0641
PO BOX 642, GLENWOOD SPRINGS, CO 81602-0642
PO BOX 643, GLENWOOD SPRINGS, CO 81602-0643
PO BOX 644, GLENWOOD SPRINGS, CO 81602-0644
PO BOX 645, GLENWOOD SPRINGS, CO 81602-0645
PO BOX 646, GLENWOOD SPRINGS, CO 81602-0646
PO BOX 647, GLENWOOD SPRINGS, CO 81602-0647
PO BOX 648, GLENWOOD SPRINGS, CO 81602-0648
PO BOX 649, GLENWOOD SPRINGS, CO 81602-0649
PO BOX 650, GLENWOOD SPRINGS, CO 81602-0650
PO BOX 651, GLENWOOD SPRINGS, CO 81602-0651
PO BOX 652, GLENWOOD SPRINGS, CO 81602-0652
PO BOX 653, GLENWOOD SPRINGS, CO 81602-0653
PO BOX 654, GLENWOOD SPRINGS, CO 81602-0654
PO BOX 655, GLENWOOD SPRINGS, CO 81602-0655
PO BOX 656, GLENWOOD SPRINGS, CO 81602-0656
PO BOX 657, GLENWOOD SPRINGS, CO 81602-0657
PO BOX 658, GLENWOOD SPRINGS, CO 81602-0658
PO BOX 659, GLENWOOD SPRINGS, CO 81602-0659
PO BOX 660, GLENWOOD SPRINGS, CO 81602-0660
PO BOX 661, GLENWOOD SPRINGS, CO 81602-0661
PO BOX 662, GLENWOOD SPRINGS, CO 81602-0662
PO BOX 663, GLENWOOD SPRINGS, CO 81602-0663
PO BOX 664, GLENWOOD SPRINGS, CO 81602-0664
PO BOX 665, GLENWOOD SPRINGS, CO 81602-0665
PO BOX 666, GLENWOOD SPRINGS, CO 81602-0666
PO BOX 667, GLENWOOD SPRINGS, CO 81602-0667
PO BOX 668, GLENWOOD SPRINGS, CO 81602-0668
PO BOX 669, GLENWOOD SPRINGS, CO 81602-0669
PO BOX 670, GLENWOOD SPRINGS, CO 81602-0670
PO BOX 671, GLENWOOD SPRINGS, CO 81602-0671
PO BOX 672, GLENWOOD SPRINGS, CO 81602-0672
PO BOX 673, GLENWOOD SPRINGS, CO 81602-0673
PO BOX 674, GLENWOOD SPRINGS, CO 81602-0674
PO BOX 675, GLENWOOD SPRINGS, CO 81602-0675
PO BOX 676, GLENWOOD SPRINGS, CO 81602-0676
PO BOX 677, GLENWOOD SPRINGS, CO 81602-0677
PO BOX 678, GLENWOOD SPRINGS, CO 81602-0678
PO BOX 679, GLENWOOD SPRINGS, CO 81602-0679
PO BOX 680, GLENWOOD SPRINGS, CO 81602-0680
PO BOX 681, GLENWOOD SPRINGS, CO 81602-0681
PO BOX 682, GLENWOOD SPRINGS, CO 81602-0682
PO BOX 683, GLENWOOD SPRINGS, CO 81602-0683
PO BOX 684, GLENWOOD SPRINGS, CO 81602-0684
PO BOX 685, GLENWOOD SPRINGS, CO 81602-0685
PO BOX 686, GLENWOOD SPRINGS, CO 81602-0686
PO BOX 687, GLENWOOD SPRINGS, CO 81602-0687
PO BOX 688, GLENWOOD SPRINGS, CO 81602-0688
PO BOX 689, GLENWOOD SPRINGS, CO 81602-0689
PO BOX 690, GLENWOOD SPRINGS, CO 81602-0690
PO BOX 691, GLENWOOD SPRINGS, CO 81602-0691
PO BOX 692, GLENWOOD SPRINGS, CO 81602-0692
PO BOX 693, GLENWOOD SPRINGS, CO 81602-0693
PO BOX 694, GLENWOOD SPRINGS, CO 81602-0694
PO BOX 695, GLENWOOD SPRINGS, CO 81602-0695
PO BOX 696, GLENWOOD SPRINGS, CO 81602-0696
PO BOX 697, GLENWOOD SPRINGS, CO 81602-0697
PO BOX 698, GLENWOOD SPRINGS, CO 81602-0698
PO BOX 699, GLENWOOD SPRINGS, CO 81602-0699
PO BOX 700, GLENWOOD SPRINGS, CO 81602-0700
PO BOX 701, GLENWOOD SPRINGS, CO 81602-0701
PO BOX 702, GLENWOOD SPRINGS, CO 81602-0702
PO BOX 703, GLENWOOD SPRINGS, CO 81602-0703
PO BOX 704, GLENWOOD SPRINGS, CO 81602-0704
PO BOX 705, GLENWOOD SPRINGS, CO 81602-0705
PO BOX 706, GLENWOOD SPRINGS, CO 81602-0706
PO BOX 707, GLENWOOD SPRINGS, CO 81602-0707
PO BOX 708, GLENWOOD SPRINGS, CO 81602-0708
PO BOX 709, GLENWOOD SPRINGS, CO 81602-0709
PO BOX 710, GLENWOOD SPRINGS, CO 81602-0710
PO BOX 711, GLENWOOD SPRINGS, CO 81602-0711
PO BOX 712, GLENWOOD SPRINGS, CO 81602-0712
PO BOX 713, GLENWOOD SPRINGS, CO 81602-0713
PO BOX 714, GLENWOOD SPRINGS, CO 81602-0714
PO BOX 715, GLENWOOD SPRINGS, CO 81602-0715
PO BOX 716, GLENWOOD SPRINGS, CO 81602-0716
PO BOX 717, GLENWOOD SPRINGS, CO 81602-0717
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