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, NEW TOWN, MA 02456-0541
PO BOX 542, NEW TOWN, MA 02456-0542
PO BOX 543, NEW TOWN, MA 02456-0543
PO BOX 544, NEW TOWN, MA 02456-0544
PO BOX 545, NEW TOWN, MA 02456-0545
PO BOX 546, NEW TOWN, MA 02456-0546
PO BOX 547, NEW TOWN, MA 02456-0547
PO BOX 548, NEW TOWN, MA 02456-0548
PO BOX 549, NEW TOWN, MA 02456-0549
PO BOX 550, NEW TOWN, MA 02456-0550
PO BOX 551, NEW TOWN, MA 02456-0551
PO BOX 552, NEW TOWN, MA 02456-0552
PO BOX 553, NEW TOWN, MA 02456-0553
PO BOX 554, NEW TOWN, MA 02456-0554
PO BOX 555, NEW TOWN, MA 02456-0555
PO BOX 556, NEW TOWN, MA 02456-0556
PO BOX 557, NEW TOWN, MA 02456-0557
PO BOX 558, NEW TOWN, MA 02456-0558
PO BOX 559, NEW TOWN, MA 02456-0559
PO BOX 560, NEW TOWN, MA 02456-0560
PO BOX 561, NEW TOWN, MA 02456-0561
PO BOX 562, NEW TOWN, MA 02456-0562
PO BOX 563, NEW TOWN, MA 02456-0563
PO BOX 564, NEW TOWN, MA 02456-0564
PO BOX 565, NEW TOWN, MA 02456-0565
PO BOX 566, NEW TOWN, MA 02456-0566
PO BOX 567, NEW TOWN, MA 02456-0567
PO BOX 568, NEW TOWN, MA 02456-0568
PO BOX 569, NEW TOWN, MA 02456-0569
PO BOX 570, NEW TOWN, MA 02456-0570
PO BOX 571, NEW TOWN, MA 02456-0571
PO BOX 572, NEW TOWN, MA 02456-0572
PO BOX 573, NEW TOWN, MA 02456-0573
PO BOX 574, NEW TOWN, MA 02456-0574
PO BOX 575, NEW TOWN, MA 02456-0575
PO BOX 576, NEW TOWN, MA 02456-0576
PO BOX 577, NEW TOWN, MA 02456-0577
PO BOX 578, NEW TOWN, MA 02456-0578
PO BOX 579, NEW TOWN, MA 02456-0579
PO BOX 580, NEW TOWN, MA 02456-0580
PO BOX 581, NEW TOWN, MA 02456-0581
PO BOX 582, NEW TOWN, MA 02456-0582
PO BOX 583, NEW TOWN, MA 02456-0583
PO BOX 584, NEW TOWN, MA 02456-0584
PO BOX 585, NEW TOWN, MA 02456-0585
PO BOX 586, NEW TOWN, MA 02456-0586
PO BOX 587, NEW TOWN, MA 02456-0587
PO BOX 588, NEW TOWN, MA 02456-0588
PO BOX 589, NEW TOWN, MA 02456-0589
PO BOX 590, NEW TOWN, MA 02456-0590
PO BOX 591, NEW TOWN, MA 02456-0591
PO BOX 592, NEW TOWN, MA 02456-0592
PO BOX 593, NEW TOWN, MA 02456-0593
PO BOX 594, NEW TOWN, MA 02456-0594
PO BOX 595, NEW TOWN, MA 02456-0595
PO BOX 596, NEW TOWN, MA 02456-0596
PO BOX 597, NEW TOWN, MA 02456-0597
PO BOX 598, NEW TOWN, MA 02456-0598
PO BOX 599, NEW TOWN, MA 02456-0599
PO BOX 600, NEW TOWN, MA 02456-0600
PO BOX 601, NEW TOWN, MA 02456-0601
PO BOX 602, NEW TOWN, MA 02456-0602
PO BOX 603, NEW TOWN, MA 02456-0603
PO BOX 604, NEW TOWN, MA 02456-0604
PO BOX 605, NEW TOWN, MA 02456-0605
PO BOX 606, NEW TOWN, MA 02456-0606
PO BOX 607, NEW TOWN, MA 02456-0607
PO BOX 608, NEW TOWN, MA 02456-0608
PO BOX 609, NEW TOWN, MA 02456-0609
PO BOX 610, NEW TOWN, MA 02456-0610
PO BOX 611, NEW TOWN, MA 02456-0611
PO BOX 612, NEW TOWN, MA 02456-0612
PO BOX 613, NEW TOWN, MA 02456-0613
PO BOX 614, NEW TOWN, MA 02456-0614
PO BOX 615, NEW TOWN, MA 02456-0615
PO BOX 616, NEW TOWN, MA 02456-0616
PO BOX 617, NEW TOWN, MA 02456-0617
PO BOX 618, NEW TOWN, MA 02456-0618
PO BOX 619, NEW TOWN, MA 02456-0619
PO BOX 620, NEW TOWN, MA 02456-0620
PO BOX 621, NEW TOWN, MA 02456-0621
PO BOX 622, NEW TOWN, MA 02456-0622
PO BOX 623, NEW TOWN, MA 02456-0623
PO BOX 624, NEW TOWN, MA 02456-0624
PO BOX 625, NEW TOWN, MA 02456-0625
PO BOX 626, NEW TOWN, MA 02456-0626
PO BOX 627, NEW TOWN, MA 02456-0627
PO BOX 628, NEW TOWN, MA 02456-0628
PO BOX 629, NEW TOWN, MA 02456-0629
PO BOX 630, NEW TOWN, MA 02456-0630
PO BOX 631, NEW TOWN, MA 02456-0631
PO BOX 632, NEW TOWN, MA 02456-0632
PO BOX 633, NEW TOWN, MA 02456-0633
PO BOX 634, NEW TOWN, MA 02456-0634
PO BOX 635, NEW TOWN, MA 02456-0635
PO BOX 636, NEW TOWN, MA 02456-0636
PO BOX 637, NEW TOWN, MA 02456-0637
PO BOX 638, NEW TOWN, MA 02456-0638
PO BOX 639, NEW TOWN, MA 02456-0639
PO BOX 640, NEW TOWN, MA 02456-0640
PO BOX 641, NEW TOWN, MA 02456-0641
PO BOX 642, NEW TOWN, MA 02456-0642
PO BOX 643, NEW TOWN, MA 02456-0643
PO BOX 644, NEW TOWN, MA 02456-0644
PO BOX 645, NEW TOWN, MA 02456-0645
PO BOX 646, NEW TOWN, MA 02456-0646
PO BOX 647, NEW TOWN, MA 02456-0647
PO BOX 648, NEW TOWN, MA 02456-0648
PO BOX 649, NEW TOWN, MA 02456-0649
PO BOX 650, NEW TOWN, MA 02456-0650
PO BOX 651, NEW TOWN, MA 02456-0651
PO BOX 652, NEW TOWN, MA 02456-0652
PO BOX 653, NEW TOWN, MA 02456-0653
PO BOX 654, NEW TOWN, MA 02456-0654
PO BOX 655, NEW TOWN, MA 02456-0655
PO BOX 656, NEW TOWN, MA 02456-0656
PO BOX 657, NEW TOWN, MA 02456-0657
PO BOX 658, NEW TOWN, MA 02456-0658
PO BOX 659, NEW TOWN, MA 02456-0659
PO BOX 660, NEW TOWN, MA 02456-0660
PO BOX 661, NEW TOWN, MA 02456-0661
PO BOX 662, NEW TOWN, MA 02456-0662
PO BOX 663, NEW TOWN, MA 02456-0663
PO BOX 664, NEW TOWN, MA 02456-0664
PO BOX 665, NEW TOWN, MA 02456-0665
PO BOX 666, NEW TOWN, MA 02456-0666
PO BOX 667, NEW TOWN, MA 02456-0667
PO BOX 668, NEW TOWN, MA 02456-0668
PO BOX 669, NEW TOWN, MA 02456-0669
PO BOX 670, NEW TOWN, MA 02456-0670
PO BOX 671, NEW TOWN, MA 02456-0671
PO BOX 672, NEW TOWN, MA 02456-0672
PO BOX 673, NEW TOWN, MA 02456-0673
PO BOX 674, NEW TOWN, MA 02456-0674
PO BOX 675, NEW TOWN, MA 02456-0675
PO BOX 676, NEW TOWN, MA 02456-0676
PO BOX 677, NEW TOWN, MA 02456-0677
PO BOX 678, NEW TOWN, MA 02456-0678
PO BOX 679, NEW TOWN, MA 02456-0679
PO BOX 680, NEW TOWN, MA 02456-0680
PO BOX 681, NEW TOWN, MA 02456-0681
PO BOX 682, NEW TOWN, MA 02456-0682
PO BOX 683, NEW TOWN, MA 02456-0683
PO BOX 684, NEW TOWN, MA 02456-0684
PO BOX 685, NEW TOWN, MA 02456-0685
PO BOX 686, NEW TOWN, MA 02456-0686
PO BOX 687, NEW TOWN, MA 02456-0687
PO BOX 688, NEW TOWN, MA 02456-0688
PO BOX 689, NEW TOWN, MA 02456-0689
PO BOX 690, NEW TOWN, MA 02456-0690
PO BOX 691, NEW TOWN, MA 02456-0691
PO BOX 692, NEW TOWN, MA 02456-0692
PO BOX 693, NEW TOWN, MA 02456-0693
PO BOX 694, NEW TOWN, MA 02456-0694
PO BOX 695, NEW TOWN, MA 02456-0695
PO BOX 696, NEW TOWN, MA 02456-0696
PO BOX 697, NEW TOWN, MA 02456-0697
PO BOX 698, NEW TOWN, MA 02456-0698
PO BOX 699, NEW TOWN, MA 02456-0699
PO BOX 700, NEW TOWN, MA 02456-0700
PO BOX 701, NEW TOWN, MA 02456-0701
PO BOX 702, NEW TOWN, MA 02456-0702
PO BOX 703, NEW TOWN, MA 02456-0703
PO BOX 704, NEW TOWN, MA 02456-0704
PO BOX 705, NEW TOWN, MA 02456-0705
PO BOX 706, NEW TOWN, MA 02456-0706
PO BOX 707, NEW TOWN, MA 02456-0707
PO BOX 708, NEW TOWN, MA 02456-0708
PO BOX 709, NEW TOWN, MA 02456-0709
PO BOX 710, NEW TOWN, MA 02456-0710
PO BOX 711, NEW TOWN, MA 02456-0711
PO BOX 712, NEW TOWN, MA 02456-0712
PO BOX 713, NEW TOWN, MA 02456-0713
PO BOX 714, NEW TOWN, MA 02456-0714
PO BOX 715, NEW TOWN, MA 02456-0715
PO BOX 716, NEW TOWN, MA 02456-0716
PO BOX 717, NEW TOWN, MA 02456-0717
PO BOX 718, NEW TOWN, MA 02456-0718
PO BOX 719, NEW TOWN, MA 02456-0719
PO BOX 720, NEW TOWN, MA 02456-0720
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