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, SPRING LAKE, NJ 07762-0541
PO BOX 542, SPRING LAKE, NJ 07762-0542
PO BOX 543, SPRING LAKE, NJ 07762-0543
PO BOX 544, SPRING LAKE, NJ 07762-0544
PO BOX 545, SPRING LAKE, NJ 07762-0545
PO BOX 546, SPRING LAKE, NJ 07762-0546
PO BOX 547, SPRING LAKE, NJ 07762-0547
PO BOX 548, SPRING LAKE, NJ 07762-0548
PO BOX 549, SPRING LAKE, NJ 07762-0549
PO BOX 550, SPRING LAKE, NJ 07762-0550
PO BOX 551, SPRING LAKE, NJ 07762-0551
PO BOX 552, SPRING LAKE, NJ 07762-0552
PO BOX 553, SPRING LAKE, NJ 07762-0553
PO BOX 554, SPRING LAKE, NJ 07762-0554
PO BOX 555, SPRING LAKE, NJ 07762-0555
PO BOX 556, SPRING LAKE, NJ 07762-0556
PO BOX 557, SPRING LAKE, NJ 07762-0557
PO BOX 558, SPRING LAKE, NJ 07762-0558
PO BOX 559, SPRING LAKE, NJ 07762-0559
PO BOX 560, SPRING LAKE, NJ 07762-0560
PO BOX 561, SPRING LAKE, NJ 07762-0561
PO BOX 562, SPRING LAKE, NJ 07762-0562
PO BOX 563, SPRING LAKE, NJ 07762-0563
PO BOX 564, SPRING LAKE, NJ 07762-0564
PO BOX 565, SPRING LAKE, NJ 07762-0565
PO BOX 566, SPRING LAKE, NJ 07762-0566
PO BOX 567, SPRING LAKE, NJ 07762-0567
PO BOX 568, SPRING LAKE, NJ 07762-0568
PO BOX 569, SPRING LAKE, NJ 07762-0569
PO BOX 570, SPRING LAKE, NJ 07762-0570
PO BOX 571, SPRING LAKE, NJ 07762-0571
PO BOX 572, SPRING LAKE, NJ 07762-0572
PO BOX 573, SPRING LAKE, NJ 07762-0573
PO BOX 574, SPRING LAKE, NJ 07762-0574
PO BOX 575, SPRING LAKE, NJ 07762-0575
PO BOX 576, SPRING LAKE, NJ 07762-0576
PO BOX 577, SPRING LAKE, NJ 07762-0577
PO BOX 578, SPRING LAKE, NJ 07762-0578
PO BOX 579, SPRING LAKE, NJ 07762-0579
PO BOX 580, SPRING LAKE, NJ 07762-0580
PO BOX 581, SPRING LAKE, NJ 07762-0581
PO BOX 582, SPRING LAKE, NJ 07762-0582
PO BOX 583, SPRING LAKE, NJ 07762-0583
PO BOX 584, SPRING LAKE, NJ 07762-0584
PO BOX 585, SPRING LAKE, NJ 07762-0585
PO BOX 586, SPRING LAKE, NJ 07762-0586
PO BOX 587, SPRING LAKE, NJ 07762-0587
PO BOX 588, SPRING LAKE, NJ 07762-0588
PO BOX 589, SPRING LAKE, NJ 07762-0589
PO BOX 590, SPRING LAKE, NJ 07762-0590
PO BOX 591, SPRING LAKE, NJ 07762-0591
PO BOX 592, SPRING LAKE, NJ 07762-0592
PO BOX 593, SPRING LAKE, NJ 07762-0593
PO BOX 594, SPRING LAKE, NJ 07762-0594
PO BOX 595, SPRING LAKE, NJ 07762-0595
PO BOX 596, SPRING LAKE, NJ 07762-0596
PO BOX 597, SPRING LAKE, NJ 07762-0597
PO BOX 598, SPRING LAKE, NJ 07762-0598
PO BOX 599, SPRING LAKE, NJ 07762-0599
PO BOX 600, SPRING LAKE, NJ 07762-0600
PO BOX 601, SPRING LAKE, NJ 07762-0601
PO BOX 602, SPRING LAKE, NJ 07762-0602
PO BOX 603, SPRING LAKE, NJ 07762-0603
PO BOX 604, SPRING LAKE, NJ 07762-0604
PO BOX 605, SPRING LAKE, NJ 07762-0605
PO BOX 606, SPRING LAKE, NJ 07762-0606
PO BOX 607, SPRING LAKE, NJ 07762-0607
PO BOX 608, SPRING LAKE, NJ 07762-0608
PO BOX 609, SPRING LAKE, NJ 07762-0609
PO BOX 610, SPRING LAKE, NJ 07762-0610
PO BOX 611, SPRING LAKE, NJ 07762-0611
PO BOX 612, SPRING LAKE, NJ 07762-0612
PO BOX 613, SPRING LAKE, NJ 07762-0613
PO BOX 614, SPRING LAKE, NJ 07762-0614
PO BOX 615, SPRING LAKE, NJ 07762-0615
PO BOX 616, SPRING LAKE, NJ 07762-0616
PO BOX 617, SPRING LAKE, NJ 07762-0617
PO BOX 618, SPRING LAKE, NJ 07762-0618
PO BOX 619, SPRING LAKE, NJ 07762-0619
PO BOX 620, SPRING LAKE, NJ 07762-0620
PO BOX 621, SPRING LAKE, NJ 07762-0621
PO BOX 622, SPRING LAKE, NJ 07762-0622
PO BOX 623, SPRING LAKE, NJ 07762-0623
PO BOX 624, SPRING LAKE, NJ 07762-0624
PO BOX 625, SPRING LAKE, NJ 07762-0625
PO BOX 626, SPRING LAKE, NJ 07762-0626
PO BOX 627, SPRING LAKE, NJ 07762-0627
PO BOX 628, SPRING LAKE, NJ 07762-0628
PO BOX 629, SPRING LAKE, NJ 07762-0629
PO BOX 630, SPRING LAKE, NJ 07762-0630
PO BOX 631, SPRING LAKE, NJ 07762-0631
PO BOX 632, SPRING LAKE, NJ 07762-0632
PO BOX 633, SPRING LAKE, NJ 07762-0633
PO BOX 634, SPRING LAKE, NJ 07762-0634
PO BOX 635, SPRING LAKE, NJ 07762-0635
PO BOX 636, SPRING LAKE, NJ 07762-0636
PO BOX 637, SPRING LAKE, NJ 07762-0637
PO BOX 638, SPRING LAKE, NJ 07762-0638
PO BOX 639, SPRING LAKE, NJ 07762-0639
PO BOX 640, SPRING LAKE, NJ 07762-0640
PO BOX 641, SPRING LAKE, NJ 07762-0641
PO BOX 642, SPRING LAKE, NJ 07762-0642
PO BOX 643, SPRING LAKE, NJ 07762-0643
PO BOX 644, SPRING LAKE, NJ 07762-0644
PO BOX 645, SPRING LAKE, NJ 07762-0645
PO BOX 646, SPRING LAKE, NJ 07762-0646
PO BOX 647, SPRING LAKE, NJ 07762-0647
PO BOX 648, SPRING LAKE, NJ 07762-0648
PO BOX 649, SPRING LAKE, NJ 07762-0649
PO BOX 650, SPRING LAKE, NJ 07762-0650
PO BOX 651, SPRING LAKE, NJ 07762-0651
PO BOX 652, SPRING LAKE, NJ 07762-0652
PO BOX 653, SPRING LAKE, NJ 07762-0653
PO BOX 654, SPRING LAKE, NJ 07762-0654
PO BOX 655, SPRING LAKE, NJ 07762-0655
PO BOX 656, SPRING LAKE, NJ 07762-0656
PO BOX 657, SPRING LAKE, NJ 07762-0657
PO BOX 658, SPRING LAKE, NJ 07762-0658
PO BOX 659, SPRING LAKE, NJ 07762-0659
PO BOX 660, SPRING LAKE, NJ 07762-0660
PO BOX 661, SPRING LAKE, NJ 07762-0661
PO BOX 662, SPRING LAKE, NJ 07762-0662
PO BOX 663, SPRING LAKE, NJ 07762-0663
PO BOX 664, SPRING LAKE, NJ 07762-0664
PO BOX 665, SPRING LAKE, NJ 07762-0665
PO BOX 666, SPRING LAKE, NJ 07762-0666
PO BOX 667, SPRING LAKE, NJ 07762-0667
PO BOX 668, SPRING LAKE, NJ 07762-0668
PO BOX 669, SPRING LAKE, NJ 07762-0669
PO BOX 670, SPRING LAKE, NJ 07762-0670
PO BOX 671, SPRING LAKE, NJ 07762-0671
PO BOX 672, SPRING LAKE, NJ 07762-0672
PO BOX 673, SPRING LAKE, NJ 07762-0673
PO BOX 674, SPRING LAKE, NJ 07762-0674
PO BOX 675, SPRING LAKE, NJ 07762-0675
PO BOX 676, SPRING LAKE, NJ 07762-0676
PO BOX 677, SPRING LAKE, NJ 07762-0677
PO BOX 678, SPRING LAKE, NJ 07762-0678
PO BOX 679, SPRING LAKE, NJ 07762-0679
PO BOX 680, SPRING LAKE, NJ 07762-0680
PO BOX 681, SPRING LAKE, NJ 07762-0681
PO BOX 682, SPRING LAKE, NJ 07762-0682
PO BOX 683, SPRING LAKE, NJ 07762-0683
PO BOX 684, SPRING LAKE, NJ 07762-0684
PO BOX 685, SPRING LAKE, NJ 07762-0685
PO BOX 686, SPRING LAKE, NJ 07762-0686
PO BOX 687, SPRING LAKE, NJ 07762-0687
PO BOX 688, SPRING LAKE, NJ 07762-0688
PO BOX 689, SPRING LAKE, NJ 07762-0689
PO BOX 690, SPRING LAKE, NJ 07762-0690
PO BOX 691, SPRING LAKE, NJ 07762-0691
PO BOX 692, SPRING LAKE, NJ 07762-0692
PO BOX 693, SPRING LAKE, NJ 07762-0693
PO BOX 694, SPRING LAKE, NJ 07762-0694
PO BOX 695, SPRING LAKE, NJ 07762-0695
PO BOX 696, SPRING LAKE, NJ 07762-0696
PO BOX 697, SPRING LAKE, NJ 07762-0697
PO BOX 698, SPRING LAKE, NJ 07762-0698
PO BOX 699, SPRING LAKE, NJ 07762-0699
PO BOX 700, SPRING LAKE, NJ 07762-0700
PO BOX 701, SPRING LAKE, NJ 07762-0701
PO BOX 702, SPRING LAKE, NJ 07762-0702
PO BOX 703, SPRING LAKE, NJ 07762-0703
PO BOX 704, SPRING LAKE, NJ 07762-0704
PO BOX 705, SPRING LAKE, NJ 07762-0705
PO BOX 706, SPRING LAKE, NJ 07762-0706
PO BOX 707, SPRING LAKE, NJ 07762-0707
PO BOX 708, SPRING LAKE, NJ 07762-0708
PO BOX 709, SPRING LAKE, NJ 07762-0709
PO BOX 710, SPRING LAKE, NJ 07762-0710
PO BOX 711, SPRING LAKE, NJ 07762-0711
PO BOX 712, SPRING LAKE, NJ 07762-0712
PO BOX 713, SPRING LAKE, NJ 07762-0713
PO BOX 714, SPRING LAKE, NJ 07762-0714
PO BOX 715, SPRING LAKE, NJ 07762-0715
PO BOX 716, SPRING LAKE, NJ 07762-0716
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