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 481, TUNICA, MS 38676-0481
PO BOX 482, TUNICA, MS 38676-0482
PO BOX 483, TUNICA, MS 38676-0483
PO BOX 484, TUNICA, MS 38676-0484
PO BOX 485, TUNICA, MS 38676-0485
PO BOX 486, TUNICA, MS 38676-0486
PO BOX 487, TUNICA, MS 38676-0487
PO BOX 488, TUNICA, MS 38676-0488
PO BOX 489, TUNICA, MS 38676-0489
PO BOX 490, TUNICA, MS 38676-0490
PO BOX 491, TUNICA, MS 38676-0491
PO BOX 492, TUNICA, MS 38676-0492
PO BOX 493, TUNICA, MS 38676-0493
PO BOX 494, TUNICA, MS 38676-0494
PO BOX 495, TUNICA, MS 38676-0495
PO BOX 496, TUNICA, MS 38676-0496
PO BOX 497, TUNICA, MS 38676-0497
PO BOX 498, TUNICA, MS 38676-0498
PO BOX 499, TUNICA, MS 38676-0499
PO BOX 500, TUNICA, MS 38676-0500
PO BOX 501, TUNICA, MS 38676-0501
PO BOX 502, TUNICA, MS 38676-0502
PO BOX 503, TUNICA, MS 38676-0503
PO BOX 504, TUNICA, MS 38676-0504
PO BOX 505, TUNICA, MS 38676-0505
PO BOX 506, TUNICA, MS 38676-0506
PO BOX 507, TUNICA, MS 38676-0507
PO BOX 508, TUNICA, MS 38676-0508
PO BOX 509, TUNICA, MS 38676-0509
PO BOX 510, TUNICA, MS 38676-0510
PO BOX 511, TUNICA, MS 38676-0511
PO BOX 512, TUNICA, MS 38676-0512
PO BOX 513, TUNICA, MS 38676-0513
PO BOX 514, TUNICA, MS 38676-0514
PO BOX 515, TUNICA, MS 38676-0515
PO BOX 516, TUNICA, MS 38676-0516
PO BOX 517, TUNICA, MS 38676-0517
PO BOX 518, TUNICA, MS 38676-0518
PO BOX 519, TUNICA, MS 38676-0519
PO BOX 520, TUNICA, MS 38676-0520
PO BOX 521, TUNICA, MS 38676-0521
PO BOX 522, TUNICA, MS 38676-0522
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PO BOX 524, TUNICA, MS 38676-0524
PO BOX 525, TUNICA, MS 38676-0525
PO BOX 526, TUNICA, MS 38676-0526
PO BOX 527, TUNICA, MS 38676-0527
PO BOX 528, TUNICA, MS 38676-0528
PO BOX 529, TUNICA, MS 38676-0529
PO BOX 530, TUNICA, MS 38676-0530
PO BOX 531, TUNICA, MS 38676-0531
PO BOX 532, TUNICA, MS 38676-0532
PO BOX 533, TUNICA, MS 38676-0533
PO BOX 534, TUNICA, MS 38676-0534
PO BOX 535, TUNICA, MS 38676-0535
PO BOX 536, TUNICA, MS 38676-0536
PO BOX 537, TUNICA, MS 38676-0537
PO BOX 538, TUNICA, MS 38676-0538
PO BOX 539, TUNICA, MS 38676-0539
PO BOX 540, TUNICA, MS 38676-0540
PO BOX 541, TUNICA, MS 38676-0541
PO BOX 542, TUNICA, MS 38676-0542
PO BOX 543, TUNICA, MS 38676-0543
PO BOX 544, TUNICA, MS 38676-0544
PO BOX 545, TUNICA, MS 38676-0545
PO BOX 546, TUNICA, MS 38676-0546
PO BOX 547, TUNICA, MS 38676-0547
PO BOX 548, TUNICA, MS 38676-0548
PO BOX 549, TUNICA, MS 38676-0549
PO BOX 550, TUNICA, MS 38676-0550
PO BOX 551, TUNICA, MS 38676-0551
PO BOX 552, TUNICA, MS 38676-0552
PO BOX 553, TUNICA, MS 38676-0553
PO BOX 554, TUNICA, MS 38676-0554
PO BOX 555, TUNICA, MS 38676-0555
PO BOX 556, TUNICA, MS 38676-0556
PO BOX 557, TUNICA, MS 38676-0557
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PO BOX 559, TUNICA, MS 38676-0559
PO BOX 560, TUNICA, MS 38676-0560
PO BOX 561, TUNICA, MS 38676-0561
PO BOX 562, TUNICA, MS 38676-0562
PO BOX 563, TUNICA, MS 38676-0563
PO BOX 564, TUNICA, MS 38676-0564
PO BOX 565, TUNICA, MS 38676-0565
PO BOX 566, TUNICA, MS 38676-0566
PO BOX 567, TUNICA, MS 38676-0567
PO BOX 568, TUNICA, MS 38676-0568
PO BOX 569, TUNICA, MS 38676-0569
PO BOX 570, TUNICA, MS 38676-0570
PO BOX 571, TUNICA, MS 38676-0571
PO BOX 572, TUNICA, MS 38676-0572
PO BOX 573, TUNICA, MS 38676-0573
PO BOX 574, TUNICA, MS 38676-0574
PO BOX 575, TUNICA, MS 38676-0575
PO BOX 576, TUNICA, MS 38676-0576
PO BOX 577, TUNICA, MS 38676-0577
PO BOX 578, TUNICA, MS 38676-0578
PO BOX 579, TUNICA, MS 38676-0579
PO BOX 580, TUNICA, MS 38676-0580
PO BOX 581, TUNICA, MS 38676-0581
PO BOX 582, TUNICA, MS 38676-0582
PO BOX 583, TUNICA, MS 38676-0583
PO BOX 584, TUNICA, MS 38676-0584
PO BOX 585, TUNICA, MS 38676-0585
PO BOX 586, TUNICA, MS 38676-0586
PO BOX 587, TUNICA, MS 38676-0587
PO BOX 588, TUNICA, MS 38676-0588
PO BOX 589, TUNICA, MS 38676-0589
PO BOX 590, TUNICA, MS 38676-0590
PO BOX 591, TUNICA, MS 38676-0591
PO BOX 592, TUNICA, MS 38676-0592
PO BOX 593, TUNICA, MS 38676-0593
PO BOX 594, TUNICA, MS 38676-0594
PO BOX 595, TUNICA, MS 38676-0595
PO BOX 596, TUNICA, MS 38676-0596
PO BOX 597, TUNICA, MS 38676-0597
PO BOX 598, TUNICA, MS 38676-0598
PO BOX 599, TUNICA, MS 38676-0599
PO BOX 600, TUNICA, MS 38676-0600
PO BOX 601, TUNICA, MS 38676-0601
PO BOX 602, TUNICA, MS 38676-0602
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PO BOX 604, TUNICA, MS 38676-0604
PO BOX 605, TUNICA, MS 38676-0605
PO BOX 606, TUNICA, MS 38676-0606
PO BOX 607, TUNICA, MS 38676-0607
PO BOX 608, TUNICA, MS 38676-0608
PO BOX 609, TUNICA, MS 38676-0609
PO BOX 610, TUNICA, MS 38676-0610
PO BOX 611, TUNICA, MS 38676-0611
PO BOX 612, TUNICA, MS 38676-0612
PO BOX 613, TUNICA, MS 38676-0613
PO BOX 614, TUNICA, MS 38676-0614
PO BOX 615, TUNICA, MS 38676-0615
PO BOX 616, TUNICA, MS 38676-0616
PO BOX 617, TUNICA, MS 38676-0617
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PO BOX 620, TUNICA, MS 38676-0620
PO BOX 621, TUNICA, MS 38676-0621
PO BOX 622, TUNICA, MS 38676-0622
PO BOX 623, TUNICA, MS 38676-0623
PO BOX 624, TUNICA, MS 38676-0624
PO BOX 625, TUNICA, MS 38676-0625
PO BOX 626, TUNICA, MS 38676-0626
PO BOX 627, TUNICA, MS 38676-0627
PO BOX 628, TUNICA, MS 38676-0628
PO BOX 629, TUNICA, MS 38676-0629
PO BOX 630, TUNICA, MS 38676-0630
PO BOX 631, TUNICA, MS 38676-0631
PO BOX 632, TUNICA, MS 38676-0632
PO BOX 633, TUNICA, MS 38676-0633
PO BOX 634, TUNICA, MS 38676-0634
PO BOX 635, TUNICA, MS 38676-0635
PO BOX 636, TUNICA, MS 38676-0636
PO BOX 637, TUNICA, MS 38676-0637
PO BOX 638, TUNICA, MS 38676-0638
PO BOX 639, TUNICA, MS 38676-0639
PO BOX 640, TUNICA, MS 38676-0640
PO BOX 641, TUNICA, MS 38676-0641
PO BOX 642, TUNICA, MS 38676-0642
PO BOX 643, TUNICA, MS 38676-0643
PO BOX 644, TUNICA, MS 38676-0644
PO BOX 645, TUNICA, MS 38676-0645
PO BOX 646, TUNICA, MS 38676-0646
PO BOX 647, TUNICA, MS 38676-0647
PO BOX 648, TUNICA, MS 38676-0648
PO BOX 649, TUNICA, MS 38676-0649
PO BOX 650, TUNICA, MS 38676-0650
PO BOX 651, TUNICA, MS 38676-0651
PO BOX 652, TUNICA, MS 38676-0652
PO BOX 653, TUNICA, MS 38676-0653
PO BOX 654, TUNICA, MS 38676-0654
PO BOX 655, TUNICA, MS 38676-0655
PO BOX 656, TUNICA, MS 38676-0656
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