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, WEST SPRINGFIELD, MA 01090-0601
PO BOX 602, WEST SPRINGFIELD, MA 01090-0602
PO BOX 603, WEST SPRINGFIELD, MA 01090-0603
PO BOX 604, WEST SPRINGFIELD, MA 01090-0604
PO BOX 605, WEST SPRINGFIELD, MA 01090-0605
PO BOX 606, WEST SPRINGFIELD, MA 01090-0606
PO BOX 607, WEST SPRINGFIELD, MA 01090-0607
PO BOX 608, WEST SPRINGFIELD, MA 01090-0608
PO BOX 609, WEST SPRINGFIELD, MA 01090-0609
PO BOX 610, WEST SPRINGFIELD, MA 01090-0610
PO BOX 611, WEST SPRINGFIELD, MA 01090-0611
PO BOX 612, WEST SPRINGFIELD, MA 01090-0612
PO BOX 613, WEST SPRINGFIELD, MA 01090-0613
PO BOX 614, WEST SPRINGFIELD, MA 01090-0614
PO BOX 615, WEST SPRINGFIELD, MA 01090-0615
PO BOX 616, WEST SPRINGFIELD, MA 01090-0616
PO BOX 617, WEST SPRINGFIELD, MA 01090-0617
PO BOX 618, WEST SPRINGFIELD, MA 01090-0618
PO BOX 619, WEST SPRINGFIELD, MA 01090-0619
PO BOX 620, WEST SPRINGFIELD, MA 01090-0620
PO BOX 621, WEST SPRINGFIELD, MA 01090-0621
PO BOX 622, WEST SPRINGFIELD, MA 01090-0622
PO BOX 623, WEST SPRINGFIELD, MA 01090-0623
PO BOX 624, WEST SPRINGFIELD, MA 01090-0624
PO BOX 625, WEST SPRINGFIELD, MA 01090-0625
PO BOX 626, WEST SPRINGFIELD, MA 01090-0626
PO BOX 627, WEST SPRINGFIELD, MA 01090-0627
PO BOX 628, WEST SPRINGFIELD, MA 01090-0628
PO BOX 629, WEST SPRINGFIELD, MA 01090-0629
PO BOX 630, WEST SPRINGFIELD, MA 01090-0630
PO BOX 631, WEST SPRINGFIELD, MA 01090-0631
PO BOX 632, WEST SPRINGFIELD, MA 01090-0632
PO BOX 633, WEST SPRINGFIELD, MA 01090-0633
PO BOX 634, WEST SPRINGFIELD, MA 01090-0634
PO BOX 635, WEST SPRINGFIELD, MA 01090-0635
PO BOX 636, WEST SPRINGFIELD, MA 01090-0636
PO BOX 637, WEST SPRINGFIELD, MA 01090-0637
PO BOX 638, WEST SPRINGFIELD, MA 01090-0638
PO BOX 639, WEST SPRINGFIELD, MA 01090-0639
PO BOX 640, WEST SPRINGFIELD, MA 01090-0640
PO BOX 641, WEST SPRINGFIELD, MA 01090-0641
PO BOX 642, WEST SPRINGFIELD, MA 01090-0642
PO BOX 643, WEST SPRINGFIELD, MA 01090-0643
PO BOX 644, WEST SPRINGFIELD, MA 01090-0644
PO BOX 645, WEST SPRINGFIELD, MA 01090-0645
PO BOX 646, WEST SPRINGFIELD, MA 01090-0646
PO BOX 647, WEST SPRINGFIELD, MA 01090-0647
PO BOX 648, WEST SPRINGFIELD, MA 01090-0648
PO BOX 649, WEST SPRINGFIELD, MA 01090-0649
PO BOX 650, WEST SPRINGFIELD, MA 01090-0650
PO BOX 651, WEST SPRINGFIELD, MA 01090-0651
PO BOX 652, WEST SPRINGFIELD, MA 01090-0652
PO BOX 653, WEST SPRINGFIELD, MA 01090-0653
PO BOX 654, WEST SPRINGFIELD, MA 01090-0654
PO BOX 655, WEST SPRINGFIELD, MA 01090-0655
PO BOX 656, WEST SPRINGFIELD, MA 01090-0656
PO BOX 657, WEST SPRINGFIELD, MA 01090-0657
PO BOX 658, WEST SPRINGFIELD, MA 01090-0658
PO BOX 659, WEST SPRINGFIELD, MA 01090-0659
PO BOX 660, WEST SPRINGFIELD, MA 01090-0660
PO BOX 661, WEST SPRINGFIELD, MA 01090-0661
PO BOX 662, WEST SPRINGFIELD, MA 01090-0662
PO BOX 663, WEST SPRINGFIELD, MA 01090-0663
PO BOX 664, WEST SPRINGFIELD, MA 01090-0664
PO BOX 665, WEST SPRINGFIELD, MA 01090-0665
PO BOX 666, WEST SPRINGFIELD, MA 01090-0666
PO BOX 667, WEST SPRINGFIELD, MA 01090-0667
PO BOX 668, WEST SPRINGFIELD, MA 01090-0668
PO BOX 669, WEST SPRINGFIELD, MA 01090-0669
PO BOX 670, WEST SPRINGFIELD, MA 01090-0670
PO BOX 671, WEST SPRINGFIELD, MA 01090-0671
PO BOX 672, WEST SPRINGFIELD, MA 01090-0672
PO BOX 673, WEST SPRINGFIELD, MA 01090-0673
PO BOX 674, WEST SPRINGFIELD, MA 01090-0674
PO BOX 675, WEST SPRINGFIELD, MA 01090-0675
PO BOX 676, WEST SPRINGFIELD, MA 01090-0676
PO BOX 677, WEST SPRINGFIELD, MA 01090-0677
PO BOX 678, WEST SPRINGFIELD, MA 01090-0678
PO BOX 679, WEST SPRINGFIELD, MA 01090-0679
PO BOX 680, WEST SPRINGFIELD, MA 01090-0680
PO BOX 681, WEST SPRINGFIELD, MA 01090-0681
PO BOX 682, WEST SPRINGFIELD, MA 01090-0682
PO BOX 683, WEST SPRINGFIELD, MA 01090-0683
PO BOX 684, WEST SPRINGFIELD, MA 01090-0684
PO BOX 685, WEST SPRINGFIELD, MA 01090-0685
PO BOX 686, WEST SPRINGFIELD, MA 01090-0686
PO BOX 687, WEST SPRINGFIELD, MA 01090-0687
PO BOX 688, WEST SPRINGFIELD, MA 01090-0688
PO BOX 689, WEST SPRINGFIELD, MA 01090-0689
PO BOX 690, WEST SPRINGFIELD, MA 01090-0690
PO BOX 691, WEST SPRINGFIELD, MA 01090-0691
PO BOX 692, WEST SPRINGFIELD, MA 01090-0692
PO BOX 693, WEST SPRINGFIELD, MA 01090-0693
PO BOX 694, WEST SPRINGFIELD, MA 01090-0694
PO BOX 695, WEST SPRINGFIELD, MA 01090-0695
PO BOX 696, WEST SPRINGFIELD, MA 01090-0696
PO BOX 697, WEST SPRINGFIELD, MA 01090-0697
PO BOX 698, WEST SPRINGFIELD, MA 01090-0698
PO BOX 699, WEST SPRINGFIELD, MA 01090-0699
PO BOX 700, WEST SPRINGFIELD, MA 01090-0700
PO BOX 701, WEST SPRINGFIELD, MA 01090-0701
PO BOX 702, WEST SPRINGFIELD, MA 01090-0702
PO BOX 703, WEST SPRINGFIELD, MA 01090-0703
PO BOX 704, WEST SPRINGFIELD, MA 01090-0704
PO BOX 705, WEST SPRINGFIELD, MA 01090-0705
PO BOX 706, WEST SPRINGFIELD, MA 01090-0706
PO BOX 707, WEST SPRINGFIELD, MA 01090-0707
PO BOX 708, WEST SPRINGFIELD, MA 01090-0708
PO BOX 709, WEST SPRINGFIELD, MA 01090-0709
PO BOX 710, WEST SPRINGFIELD, MA 01090-0710
PO BOX 711, WEST SPRINGFIELD, MA 01090-0711
PO BOX 712, WEST SPRINGFIELD, MA 01090-0712
PO BOX 713, WEST SPRINGFIELD, MA 01090-0713
PO BOX 714, WEST SPRINGFIELD, MA 01090-0714
PO BOX 715, WEST SPRINGFIELD, MA 01090-0715
PO BOX 716, WEST SPRINGFIELD, MA 01090-0716
PO BOX 717, WEST SPRINGFIELD, MA 01090-0717
PO BOX 718, WEST SPRINGFIELD, MA 01090-0718
PO BOX 719, WEST SPRINGFIELD, MA 01090-0719
PO BOX 720, WEST SPRINGFIELD, MA 01090-0720
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