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 501, MORRISTOWN, NJ 07963-0501
PO BOX 502, MORRISTOWN, NJ 07963-0502
PO BOX 503, MORRISTOWN, NJ 07963-0503
PO BOX 504, MORRISTOWN, NJ 07963-0504
PO BOX 505, MORRISTOWN, NJ 07963-0505
PO BOX 506, MORRISTOWN, NJ 07963-0506
PO BOX 507, MORRISTOWN, NJ 07963-0507
PO BOX 508, MORRISTOWN, NJ 07963-0508
PO BOX 509, MORRISTOWN, NJ 07963-0509
PO BOX 510, MORRISTOWN, NJ 07963-0510
PO BOX 511, MORRISTOWN, NJ 07963-0511
PO BOX 512, MORRISTOWN, NJ 07963-0512
PO BOX 513, MORRISTOWN, NJ 07963-0513
PO BOX 514, MORRISTOWN, NJ 07963-0514
PO BOX 515, MORRISTOWN, NJ 07963-0515
PO BOX 516, MORRISTOWN, NJ 07963-0516
PO BOX 517, MORRISTOWN, NJ 07963-0517
PO BOX 518, MORRISTOWN, NJ 07963-0518
PO BOX 519, MORRISTOWN, NJ 07963-0519
PO BOX 520, MORRISTOWN, NJ 07963-0520
PO BOX 521, MORRISTOWN, NJ 07963-0521
PO BOX 522, MORRISTOWN, NJ 07963-0522
PO BOX 523, MORRISTOWN, NJ 07963-0523
PO BOX 524, MORRISTOWN, NJ 07963-0524
PO BOX 525, MORRISTOWN, NJ 07963-0525
PO BOX 526, MORRISTOWN, NJ 07963-0526
PO BOX 527, MORRISTOWN, NJ 07963-0527
PO BOX 528, MORRISTOWN, NJ 07963-0528
PO BOX 529, MORRISTOWN, NJ 07963-0529
PO BOX 530, MORRISTOWN, NJ 07963-0530
PO BOX 531, MORRISTOWN, NJ 07963-0531
PO BOX 532, MORRISTOWN, NJ 07963-0532
PO BOX 533, MORRISTOWN, NJ 07963-0533
PO BOX 534, MORRISTOWN, NJ 07963-0534
PO BOX 535, MORRISTOWN, NJ 07963-0535
PO BOX 536, MORRISTOWN, NJ 07963-0536
PO BOX 537, MORRISTOWN, NJ 07963-0537
PO BOX 538, MORRISTOWN, NJ 07963-0538
PO BOX 539, MORRISTOWN, NJ 07963-0539
PO BOX 540, MORRISTOWN, NJ 07963-0540
PO BOX 541, MORRISTOWN, NJ 07963-0541
PO BOX 542, MORRISTOWN, NJ 07963-0542
PO BOX 543, MORRISTOWN, NJ 07963-0543
PO BOX 544, MORRISTOWN, NJ 07963-0544
PO BOX 545, MORRISTOWN, NJ 07963-0545
PO BOX 546, MORRISTOWN, NJ 07963-0546
PO BOX 547, MORRISTOWN, NJ 07963-0547
PO BOX 548, MORRISTOWN, NJ 07963-0548
PO BOX 549, MORRISTOWN, NJ 07963-0549
PO BOX 550, MORRISTOWN, NJ 07963-0550
PO BOX 551, MORRISTOWN, NJ 07963-0551
PO BOX 552, MORRISTOWN, NJ 07963-0552
PO BOX 553, MORRISTOWN, NJ 07963-0553
PO BOX 554, MORRISTOWN, NJ 07963-0554
PO BOX 555, MORRISTOWN, NJ 07963-0555
PO BOX 556, MORRISTOWN, NJ 07963-0556
PO BOX 557, MORRISTOWN, NJ 07963-0557
PO BOX 558, MORRISTOWN, NJ 07963-0558
PO BOX 559, MORRISTOWN, NJ 07963-0559
PO BOX 560, MORRISTOWN, NJ 07963-0560
PO BOX 561, MORRISTOWN, NJ 07963-0561
PO BOX 562, MORRISTOWN, NJ 07963-0562
PO BOX 563, MORRISTOWN, NJ 07963-0563
PO BOX 564, MORRISTOWN, NJ 07963-0564
PO BOX 565, MORRISTOWN, NJ 07963-0565
PO BOX 566, MORRISTOWN, NJ 07963-0566
PO BOX 567, MORRISTOWN, NJ 07963-0567
PO BOX 568, MORRISTOWN, NJ 07963-0568
PO BOX 569, MORRISTOWN, NJ 07963-0569
PO BOX 570, MORRISTOWN, NJ 07963-0570
PO BOX 571, MORRISTOWN, NJ 07963-0571
PO BOX 572, MORRISTOWN, NJ 07963-0572
PO BOX 573, MORRISTOWN, NJ 07963-0573
PO BOX 574, MORRISTOWN, NJ 07963-0574
PO BOX 575, MORRISTOWN, NJ 07963-0575
PO BOX 576, MORRISTOWN, NJ 07963-0576
PO BOX 577, MORRISTOWN, NJ 07963-0577
PO BOX 578, MORRISTOWN, NJ 07963-0578
PO BOX 579, MORRISTOWN, NJ 07963-0579
PO BOX 580, MORRISTOWN, NJ 07963-0580
PO BOX 581, MORRISTOWN, NJ 07963-0581
PO BOX 582, MORRISTOWN, NJ 07963-0582
PO BOX 583, MORRISTOWN, NJ 07963-0583
PO BOX 584, MORRISTOWN, NJ 07963-0584
PO BOX 585, MORRISTOWN, NJ 07963-0585
PO BOX 586, MORRISTOWN, NJ 07963-0586
PO BOX 587, MORRISTOWN, NJ 07963-0587
PO BOX 588, MORRISTOWN, NJ 07963-0588
PO BOX 589, MORRISTOWN, NJ 07963-0589
PO BOX 590, MORRISTOWN, NJ 07963-0590
PO BOX 591, MORRISTOWN, NJ 07963-0591
PO BOX 592, MORRISTOWN, NJ 07963-0592
PO BOX 593, MORRISTOWN, NJ 07963-0593
PO BOX 594, MORRISTOWN, NJ 07963-0594
PO BOX 595, MORRISTOWN, NJ 07963-0595
PO BOX 596, MORRISTOWN, NJ 07963-0596
PO BOX 597, MORRISTOWN, NJ 07963-0597
PO BOX 598, MORRISTOWN, NJ 07963-0598
PO BOX 599, MORRISTOWN, NJ 07963-0599
PO BOX 600, MORRISTOWN, NJ 07963-0600
PO BOX 601, MORRISTOWN, NJ 07963-0601
PO BOX 602, MORRISTOWN, NJ 07963-0602
PO BOX 603, MORRISTOWN, NJ 07963-0603
PO BOX 604, MORRISTOWN, NJ 07963-0604
PO BOX 605, MORRISTOWN, NJ 07963-0605
PO BOX 606, MORRISTOWN, NJ 07963-0606
PO BOX 607, MORRISTOWN, NJ 07963-0607
PO BOX 608, MORRISTOWN, NJ 07963-0608
PO BOX 609, MORRISTOWN, NJ 07963-0609
PO BOX 610, MORRISTOWN, NJ 07963-0610
PO BOX 611, MORRISTOWN, NJ 07963-0611
PO BOX 612, MORRISTOWN, NJ 07963-0612
PO BOX 613, MORRISTOWN, NJ 07963-0613
PO BOX 614, MORRISTOWN, NJ 07963-0614
PO BOX 615, MORRISTOWN, NJ 07963-0615
PO BOX 616, MORRISTOWN, NJ 07963-0616
PO BOX 617, MORRISTOWN, NJ 07963-0617
PO BOX 618, MORRISTOWN, NJ 07963-0618
PO BOX 619, MORRISTOWN, NJ 07963-0619
PO BOX 620, MORRISTOWN, NJ 07963-0620
PO BOX 621, MORRISTOWN, NJ 07963-0621
PO BOX 622, MORRISTOWN, NJ 07963-0622
PO BOX 623, MORRISTOWN, NJ 07963-0623
PO BOX 624, MORRISTOWN, NJ 07963-0624
PO BOX 625, MORRISTOWN, NJ 07963-0625
PO BOX 626, MORRISTOWN, NJ 07963-0626
PO BOX 627, MORRISTOWN, NJ 07963-0627
PO BOX 628, MORRISTOWN, NJ 07963-0628
PO BOX 629, MORRISTOWN, NJ 07963-0629
PO BOX 630, MORRISTOWN, NJ 07963-0630
PO BOX 631, MORRISTOWN, NJ 07963-0631
PO BOX 632, MORRISTOWN, NJ 07963-0632
PO BOX 633, MORRISTOWN, NJ 07963-0633
PO BOX 634, MORRISTOWN, NJ 07963-0634
PO BOX 635, MORRISTOWN, NJ 07963-0635
PO BOX 636, MORRISTOWN, NJ 07963-0636
PO BOX 637, MORRISTOWN, NJ 07963-0637
PO BOX 638, MORRISTOWN, NJ 07963-0638
PO BOX 639, MORRISTOWN, NJ 07963-0639
PO BOX 640, MORRISTOWN, NJ 07963-0640
PO BOX 641, MORRISTOWN, NJ 07963-0641
PO BOX 642, MORRISTOWN, NJ 07963-0642
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