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 541, SOUTH LANCASTER, MA 01561-0541
PO BOX 542, SOUTH LANCASTER, MA 01561-0542
PO BOX 543, SOUTH LANCASTER, MA 01561-0543
PO BOX 544, SOUTH LANCASTER, MA 01561-0544
PO BOX 545, SOUTH LANCASTER, MA 01561-0545
PO BOX 546, SOUTH LANCASTER, MA 01561-0546
PO BOX 547, SOUTH LANCASTER, MA 01561-0547
PO BOX 548, SOUTH LANCASTER, MA 01561-0548
PO BOX 549, SOUTH LANCASTER, MA 01561-0549
PO BOX 550, SOUTH LANCASTER, MA 01561-0550
PO BOX 551, SOUTH LANCASTER, MA 01561-0551
PO BOX 552, SOUTH LANCASTER, MA 01561-0552
PO BOX 553, SOUTH LANCASTER, MA 01561-0553
PO BOX 554, SOUTH LANCASTER, MA 01561-0554
PO BOX 555, SOUTH LANCASTER, MA 01561-0555
PO BOX 556, SOUTH LANCASTER, MA 01561-0556
PO BOX 557, SOUTH LANCASTER, MA 01561-0557
PO BOX 558, SOUTH LANCASTER, MA 01561-0558
PO BOX 559, SOUTH LANCASTER, MA 01561-0559
PO BOX 560, SOUTH LANCASTER, MA 01561-0560
PO BOX 561, SOUTH LANCASTER, MA 01561-0561
PO BOX 562, SOUTH LANCASTER, MA 01561-0562
PO BOX 563, SOUTH LANCASTER, MA 01561-0563
PO BOX 564, SOUTH LANCASTER, MA 01561-0564
PO BOX 565, SOUTH LANCASTER, MA 01561-0565
PO BOX 566, SOUTH LANCASTER, MA 01561-0566
PO BOX 567, SOUTH LANCASTER, MA 01561-0567
PO BOX 568, SOUTH LANCASTER, MA 01561-0568
PO BOX 569, SOUTH LANCASTER, MA 01561-0569
PO BOX 570, SOUTH LANCASTER, MA 01561-0570
PO BOX 571, SOUTH LANCASTER, MA 01561-0571
PO BOX 572, SOUTH LANCASTER, MA 01561-0572
PO BOX 573, SOUTH LANCASTER, MA 01561-0573
PO BOX 574, SOUTH LANCASTER, MA 01561-0574
PO BOX 575, SOUTH LANCASTER, MA 01561-0575
PO BOX 576, SOUTH LANCASTER, MA 01561-0576
PO BOX 577, SOUTH LANCASTER, MA 01561-0577
PO BOX 578, SOUTH LANCASTER, MA 01561-0578
PO BOX 579, SOUTH LANCASTER, MA 01561-0579
PO BOX 580, SOUTH LANCASTER, MA 01561-0580
PO BOX 581, SOUTH LANCASTER, MA 01561-0581
PO BOX 582, SOUTH LANCASTER, MA 01561-0582
PO BOX 583, SOUTH LANCASTER, MA 01561-0583
PO BOX 584, SOUTH LANCASTER, MA 01561-0584
PO BOX 585, SOUTH LANCASTER, MA 01561-0585
PO BOX 586, SOUTH LANCASTER, MA 01561-0586
PO BOX 587, SOUTH LANCASTER, MA 01561-0587
PO BOX 588, SOUTH LANCASTER, MA 01561-0588
PO BOX 589, SOUTH LANCASTER, MA 01561-0589
PO BOX 590, SOUTH LANCASTER, MA 01561-0590
PO BOX 591, SOUTH LANCASTER, MA 01561-0591
PO BOX 592, SOUTH LANCASTER, MA 01561-0592
PO BOX 593, SOUTH LANCASTER, MA 01561-0593
PO BOX 594, SOUTH LANCASTER, MA 01561-0594
PO BOX 595, SOUTH LANCASTER, MA 01561-0595
PO BOX 596, SOUTH LANCASTER, MA 01561-0596
PO BOX 597, SOUTH LANCASTER, MA 01561-0597
PO BOX 598, SOUTH LANCASTER, MA 01561-0598
PO BOX 599, SOUTH LANCASTER, MA 01561-0599
PO BOX 600, SOUTH LANCASTER, MA 01561-0600
PO BOX 601, SOUTH LANCASTER, MA 01561-0601
PO BOX 602, SOUTH LANCASTER, MA 01561-0602
PO BOX 603, SOUTH LANCASTER, MA 01561-0603
PO BOX 604, SOUTH LANCASTER, MA 01561-0604
PO BOX 605, SOUTH LANCASTER, MA 01561-0605
PO BOX 606, SOUTH LANCASTER, MA 01561-0606
PO BOX 607, SOUTH LANCASTER, MA 01561-0607
PO BOX 608, SOUTH LANCASTER, MA 01561-0608
PO BOX 609, SOUTH LANCASTER, MA 01561-0609
PO BOX 610, SOUTH LANCASTER, MA 01561-0610
PO BOX 611, SOUTH LANCASTER, MA 01561-0611
PO BOX 612, SOUTH LANCASTER, MA 01561-0612
PO BOX 613, SOUTH LANCASTER, MA 01561-0613
PO BOX 614, SOUTH LANCASTER, MA 01561-0614
PO BOX 615, SOUTH LANCASTER, MA 01561-0615
PO BOX 616, SOUTH LANCASTER, MA 01561-0616
PO BOX 617, SOUTH LANCASTER, MA 01561-0617
PO BOX 618, SOUTH LANCASTER, MA 01561-0618
PO BOX 619, SOUTH LANCASTER, MA 01561-0619
PO BOX 620, SOUTH LANCASTER, MA 01561-0620
PO BOX 621, SOUTH LANCASTER, MA 01561-0621
PO BOX 622, SOUTH LANCASTER, MA 01561-0622
PO BOX 623, SOUTH LANCASTER, MA 01561-0623
PO BOX 624, SOUTH LANCASTER, MA 01561-0624
PO BOX 625, SOUTH LANCASTER, MA 01561-0625
PO BOX 626, SOUTH LANCASTER, MA 01561-0626
PO BOX 627, SOUTH LANCASTER, MA 01561-0627
PO BOX 628, SOUTH LANCASTER, MA 01561-0628
PO BOX 629, SOUTH LANCASTER, MA 01561-0629
PO BOX 630, SOUTH LANCASTER, MA 01561-0630
PO BOX 631, SOUTH LANCASTER, MA 01561-0631
PO BOX 632, SOUTH LANCASTER, MA 01561-0632
PO BOX 633, SOUTH LANCASTER, MA 01561-0633
PO BOX 634, SOUTH LANCASTER, MA 01561-0634
PO BOX 635, SOUTH LANCASTER, MA 01561-0635
PO BOX 636, SOUTH LANCASTER, MA 01561-0636
PO BOX 637, SOUTH LANCASTER, MA 01561-0637
PO BOX 638, SOUTH LANCASTER, MA 01561-0638
PO BOX 639, SOUTH LANCASTER, MA 01561-0639
PO BOX 640, SOUTH LANCASTER, MA 01561-0640
PO BOX 641, SOUTH LANCASTER, MA 01561-0641
PO BOX 642, SOUTH LANCASTER, MA 01561-0642
PO BOX 643, SOUTH LANCASTER, MA 01561-0643
PO BOX 644, SOUTH LANCASTER, MA 01561-0644
PO BOX 645, SOUTH LANCASTER, MA 01561-0645
PO BOX 646, SOUTH LANCASTER, MA 01561-0646
PO BOX 647, SOUTH LANCASTER, MA 01561-0647
PO BOX 648, SOUTH LANCASTER, MA 01561-0648
PO BOX 649, SOUTH LANCASTER, MA 01561-0649
PO BOX 650, SOUTH LANCASTER, MA 01561-0650
PO BOX 651, SOUTH LANCASTER, MA 01561-0651
PO BOX 652, SOUTH LANCASTER, MA 01561-0652
PO BOX 653, SOUTH LANCASTER, MA 01561-0653
PO BOX 654, SOUTH LANCASTER, MA 01561-0654
PO BOX 655, SOUTH LANCASTER, MA 01561-0655
PO BOX 656, SOUTH LANCASTER, MA 01561-0656
PO BOX 657, SOUTH LANCASTER, MA 01561-0657
PO BOX 658, SOUTH LANCASTER, MA 01561-0658
PO BOX 659, SOUTH LANCASTER, MA 01561-0659
PO BOX 660, SOUTH LANCASTER, MA 01561-0660
PO BOX 661, SOUTH LANCASTER, MA 01561-0661
PO BOX 662, SOUTH LANCASTER, MA 01561-0662
PO BOX 663, SOUTH LANCASTER, MA 01561-0663
PO BOX 664, SOUTH LANCASTER, MA 01561-0664
PO BOX 665, SOUTH LANCASTER, MA 01561-0665
PO BOX 666, SOUTH LANCASTER, MA 01561-0666
PO BOX 667, SOUTH LANCASTER, MA 01561-0667
PO BOX 668, SOUTH LANCASTER, MA 01561-0668
PO BOX 669, SOUTH LANCASTER, MA 01561-0669
PO BOX 670, SOUTH LANCASTER, MA 01561-0670
PO BOX 671, SOUTH LANCASTER, MA 01561-0671
PO BOX 672, SOUTH LANCASTER, MA 01561-0672
PO BOX 673, SOUTH LANCASTER, MA 01561-0673
PO BOX 674, SOUTH LANCASTER, MA 01561-0674
PO BOX 675, SOUTH LANCASTER, MA 01561-0675
PO BOX 676, SOUTH LANCASTER, MA 01561-0676
PO BOX 677, SOUTH LANCASTER, MA 01561-0677
PO BOX 678, SOUTH LANCASTER, MA 01561-0678
PO BOX 679, SOUTH LANCASTER, MA 01561-0679
PO BOX 680, SOUTH LANCASTER, MA 01561-0680
PO BOX 681, SOUTH LANCASTER, MA 01561-0681
PO BOX 682, SOUTH LANCASTER, MA 01561-0682
PO BOX 683, SOUTH LANCASTER, MA 01561-0683
PO BOX 684, SOUTH LANCASTER, MA 01561-0684
PO BOX 685, SOUTH LANCASTER, MA 01561-0685
PO BOX 686, SOUTH LANCASTER, MA 01561-0686
PO BOX 687, SOUTH LANCASTER, MA 01561-0687
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