หมายเลขตู้ป ณ . ต้องน้อยกว่าหรือมากกว่าสี่หลัก สำหรับตู้ไปรษณีย์กฎทั่วไปคือแต่ละกล่องจะมีรหัส ZIP + 4 ของตัวเอง
ตัวเลขสี่หลักสุดท้ายมักเป็นตัวเลขใดตัวหนึ่งต่อไปนี้:
1. ศูนย์บวกสามหลักสุดท้ายของหมายเลขกล่อง (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. สี่หลักสุดท้ายของหมายเลขกล่อง (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. หากหมายเลขกล่องน้อยกว่าสี่หลักให้มีเลขศูนย์ที่อยู่ข้างหน้าหมายเลขกล่องมากพอเพื่อสร้างตัวเลขสี่หลัก(eg. PO BOX 1, Shreveport LA 71161-0001).
อย่างไรก็ตามไม่มีกฎที่เหมือนกันรหัสไปรษณีย์บวกสี่ใช้สำหรับการอ้างอิงเท่านั้นต้องค้นหารหัส ZIP + 4 ทีละกล่องในเว็บไซต์ทางการของ USPS
PO BOX 561, BOUND BROOK, NJ 08805-0561
PO BOX 562, BOUND BROOK, NJ 08805-0562
PO BOX 563, BOUND BROOK, NJ 08805-0563
PO BOX 564, BOUND BROOK, NJ 08805-0564
PO BOX 565, BOUND BROOK, NJ 08805-0565
PO BOX 566, BOUND BROOK, NJ 08805-0566
PO BOX 567, BOUND BROOK, NJ 08805-0567
PO BOX 568, BOUND BROOK, NJ 08805-0568
PO BOX 569, BOUND BROOK, NJ 08805-0569
PO BOX 570, BOUND BROOK, NJ 08805-0570
PO BOX 571, BOUND BROOK, NJ 08805-0571
PO BOX 572, BOUND BROOK, NJ 08805-0572
PO BOX 573, BOUND BROOK, NJ 08805-0573
PO BOX 574, BOUND BROOK, NJ 08805-0574
PO BOX 575, BOUND BROOK, NJ 08805-0575
PO BOX 576, BOUND BROOK, NJ 08805-0576
PO BOX 577, BOUND BROOK, NJ 08805-0577
PO BOX 578, BOUND BROOK, NJ 08805-0578
PO BOX 579, BOUND BROOK, NJ 08805-0579
PO BOX 580, BOUND BROOK, NJ 08805-0580
PO BOX 581, BOUND BROOK, NJ 08805-0581
PO BOX 582, BOUND BROOK, NJ 08805-0582
PO BOX 583, BOUND BROOK, NJ 08805-0583
PO BOX 584, BOUND BROOK, NJ 08805-0584
PO BOX 585, BOUND BROOK, NJ 08805-0585
PO BOX 586, BOUND BROOK, NJ 08805-0586
PO BOX 587, BOUND BROOK, NJ 08805-0587
PO BOX 588, BOUND BROOK, NJ 08805-0588
PO BOX 589, BOUND BROOK, NJ 08805-0589
PO BOX 590, BOUND BROOK, NJ 08805-0590
PO BOX 591, BOUND BROOK, NJ 08805-0591
PO BOX 592, BOUND BROOK, NJ 08805-0592
PO BOX 593, BOUND BROOK, NJ 08805-0593
PO BOX 594, BOUND BROOK, NJ 08805-0594
PO BOX 595, BOUND BROOK, NJ 08805-0595
PO BOX 596, BOUND BROOK, NJ 08805-0596
PO BOX 597, BOUND BROOK, NJ 08805-0597
PO BOX 598, BOUND BROOK, NJ 08805-0598
PO BOX 599, BOUND BROOK, NJ 08805-0599
PO BOX 600, BOUND BROOK, NJ 08805-0600
PO BOX 601, BOUND BROOK, NJ 08805-0601
PO BOX 602, BOUND BROOK, NJ 08805-0602
PO BOX 603, BOUND BROOK, NJ 08805-0603
PO BOX 604, BOUND BROOK, NJ 08805-0604
PO BOX 605, BOUND BROOK, NJ 08805-0605
PO BOX 606, BOUND BROOK, NJ 08805-0606
PO BOX 607, BOUND BROOK, NJ 08805-0607
PO BOX 608, BOUND BROOK, NJ 08805-0608
PO BOX 609, BOUND BROOK, NJ 08805-0609
PO BOX 610, BOUND BROOK, NJ 08805-0610
PO BOX 611, BOUND BROOK, NJ 08805-0611
PO BOX 612, BOUND BROOK, NJ 08805-0612
PO BOX 613, BOUND BROOK, NJ 08805-0613
PO BOX 614, BOUND BROOK, NJ 08805-0614
PO BOX 615, BOUND BROOK, NJ 08805-0615
PO BOX 616, BOUND BROOK, NJ 08805-0616
PO BOX 617, BOUND BROOK, NJ 08805-0617
PO BOX 618, BOUND BROOK, NJ 08805-0618
PO BOX 619, BOUND BROOK, NJ 08805-0619
PO BOX 620, BOUND BROOK, NJ 08805-0620
PO BOX 621, BOUND BROOK, NJ 08805-0621
PO BOX 622, BOUND BROOK, NJ 08805-0622
PO BOX 623, BOUND BROOK, NJ 08805-0623
PO BOX 624, BOUND BROOK, NJ 08805-0624
PO BOX 625, BOUND BROOK, NJ 08805-0625
PO BOX 626, BOUND BROOK, NJ 08805-0626
PO BOX 627, BOUND BROOK, NJ 08805-0627
PO BOX 628, BOUND BROOK, NJ 08805-0628
PO BOX 629, BOUND BROOK, NJ 08805-0629
PO BOX 630, BOUND BROOK, NJ 08805-0630
PO BOX 631, BOUND BROOK, NJ 08805-0631
PO BOX 632, BOUND BROOK, NJ 08805-0632
PO BOX 633, BOUND BROOK, NJ 08805-0633
PO BOX 634, BOUND BROOK, NJ 08805-0634
PO BOX 635, BOUND BROOK, NJ 08805-0635
PO BOX 636, BOUND BROOK, NJ 08805-0636
PO BOX 637, BOUND BROOK, NJ 08805-0637
PO BOX 638, BOUND BROOK, NJ 08805-0638
PO BOX 639, BOUND BROOK, NJ 08805-0639
PO BOX 640, BOUND BROOK, NJ 08805-0640
PO BOX 641, BOUND BROOK, NJ 08805-0641
PO BOX 642, BOUND BROOK, NJ 08805-0642
PO BOX 643, BOUND BROOK, NJ 08805-0643
PO BOX 644, BOUND BROOK, NJ 08805-0644
PO BOX 645, BOUND BROOK, NJ 08805-0645
PO BOX 646, BOUND BROOK, NJ 08805-0646
PO BOX 647, BOUND BROOK, NJ 08805-0647
PO BOX 648, BOUND BROOK, NJ 08805-0648
PO BOX 649, BOUND BROOK, NJ 08805-0649
PO BOX 650, BOUND BROOK, NJ 08805-0650
PO BOX 651, BOUND BROOK, NJ 08805-0651
PO BOX 652, BOUND BROOK, NJ 08805-0652
PO BOX 653, BOUND BROOK, NJ 08805-0653
PO BOX 654, BOUND BROOK, NJ 08805-0654
PO BOX 655, BOUND BROOK, NJ 08805-0655
PO BOX 656, BOUND BROOK, NJ 08805-0656
PO BOX 657, BOUND BROOK, NJ 08805-0657
PO BOX 658, BOUND BROOK, NJ 08805-0658
PO BOX 659, BOUND BROOK, NJ 08805-0659
PO BOX 660, BOUND BROOK, NJ 08805-0660
PO BOX 661, BOUND BROOK, NJ 08805-0661
PO BOX 662, BOUND BROOK, NJ 08805-0662
PO BOX 663, BOUND BROOK, NJ 08805-0663
PO BOX 664, BOUND BROOK, NJ 08805-0664
PO BOX 665, BOUND BROOK, NJ 08805-0665
PO BOX 666, BOUND BROOK, NJ 08805-0666
PO BOX 667, BOUND BROOK, NJ 08805-0667
PO BOX 668, BOUND BROOK, NJ 08805-0668
PO BOX 669, BOUND BROOK, NJ 08805-0669
PO BOX 670, BOUND BROOK, NJ 08805-0670
PO BOX 671, BOUND BROOK, NJ 08805-0671
PO BOX 672, BOUND BROOK, NJ 08805-0672
PO BOX 673, BOUND BROOK, NJ 08805-0673
PO BOX 674, BOUND BROOK, NJ 08805-0674
PO BOX 675, BOUND BROOK, NJ 08805-0675
PO BOX 676, BOUND BROOK, NJ 08805-0676
PO BOX 677, BOUND BROOK, NJ 08805-0677
PO BOX 678, BOUND BROOK, NJ 08805-0678
PO BOX 679, BOUND BROOK, NJ 08805-0679
PO BOX 680, BOUND BROOK, NJ 08805-0680
PO BOX 681, BOUND BROOK, NJ 08805-0681
PO BOX 682, BOUND BROOK, NJ 08805-0682
PO BOX 683, BOUND BROOK, NJ 08805-0683
PO BOX 684, BOUND BROOK, NJ 08805-0684
PO BOX 685, BOUND BROOK, NJ 08805-0685
PO BOX 686, BOUND BROOK, NJ 08805-0686
PO BOX 687, BOUND BROOK, NJ 08805-0687
PO BOX 688, BOUND BROOK, NJ 08805-0688
PO BOX 689, BOUND BROOK, NJ 08805-0689
PO BOX 690, BOUND BROOK, NJ 08805-0690
PO BOX 691, BOUND BROOK, NJ 08805-0691
PO BOX 692, BOUND BROOK, NJ 08805-0692
PO BOX 693, BOUND BROOK, NJ 08805-0693
PO BOX 694, BOUND BROOK, NJ 08805-0694
PO BOX 695, BOUND BROOK, NJ 08805-0695
PO BOX 696, BOUND BROOK, NJ 08805-0696
PO BOX 697, BOUND BROOK, NJ 08805-0697
PO BOX 698, BOUND BROOK, NJ 08805-0698
PO BOX 699, BOUND BROOK, NJ 08805-0699
PO BOX 700, BOUND BROOK, NJ 08805-0700
PO BOX 701, BOUND BROOK, NJ 08805-0701
PO BOX 702, BOUND BROOK, NJ 08805-0702
PO BOX 703, BOUND BROOK, NJ 08805-0703
PO BOX 704, BOUND BROOK, NJ 08805-0704
PO BOX 705, BOUND BROOK, NJ 08805-0705
PO BOX 706, BOUND BROOK, NJ 08805-0706
PO BOX 707, BOUND BROOK, NJ 08805-0707
PO BOX 708, BOUND BROOK, NJ 08805-0708
PO BOX 709, BOUND BROOK, NJ 08805-0709
PO BOX 710, BOUND BROOK, NJ 08805-0710
PO BOX 711, BOUND BROOK, NJ 08805-0711
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