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 481, ROYAL CENTER, IN 46978-0481
PO BOX 482, ROYAL CENTER, IN 46978-0482
PO BOX 483, ROYAL CENTER, IN 46978-0483
PO BOX 484, ROYAL CENTER, IN 46978-0484
PO BOX 485, ROYAL CENTER, IN 46978-0485
PO BOX 486, ROYAL CENTER, IN 46978-0486
PO BOX 487, ROYAL CENTER, IN 46978-0487
PO BOX 488, ROYAL CENTER, IN 46978-0488
PO BOX 489, ROYAL CENTER, IN 46978-0489
PO BOX 490, ROYAL CENTER, IN 46978-0490
PO BOX 491, ROYAL CENTER, IN 46978-0491
PO BOX 492, ROYAL CENTER, IN 46978-0492
PO BOX 493, ROYAL CENTER, IN 46978-0493
PO BOX 494, ROYAL CENTER, IN 46978-0494
PO BOX 495, ROYAL CENTER, IN 46978-0495
PO BOX 496, ROYAL CENTER, IN 46978-0496
PO BOX 497, ROYAL CENTER, IN 46978-0497
PO BOX 498, ROYAL CENTER, IN 46978-0498
PO BOX 499, ROYAL CENTER, IN 46978-0499
PO BOX 500, ROYAL CENTER, IN 46978-0500
PO BOX 501, ROYAL CENTER, IN 46978-0501
PO BOX 502, ROYAL CENTER, IN 46978-0502
PO BOX 503, ROYAL CENTER, IN 46978-0503
PO BOX 504, ROYAL CENTER, IN 46978-0504
PO BOX 505, ROYAL CENTER, IN 46978-0505
PO BOX 506, ROYAL CENTER, IN 46978-0506
PO BOX 507, ROYAL CENTER, IN 46978-0507
PO BOX 508, ROYAL CENTER, IN 46978-0508
PO BOX 509, ROYAL CENTER, IN 46978-0509
PO BOX 510, ROYAL CENTER, IN 46978-0510
PO BOX 511, ROYAL CENTER, IN 46978-0511
PO BOX 512, ROYAL CENTER, IN 46978-0512
PO BOX 513, ROYAL CENTER, IN 46978-0513
PO BOX 514, ROYAL CENTER, IN 46978-0514
PO BOX 515, ROYAL CENTER, IN 46978-0515
PO BOX 516, ROYAL CENTER, IN 46978-0516
PO BOX 517, ROYAL CENTER, IN 46978-0517
PO BOX 518, ROYAL CENTER, IN 46978-0518
PO BOX 519, ROYAL CENTER, IN 46978-0519
PO BOX 520, ROYAL CENTER, IN 46978-0520
PO BOX 521, ROYAL CENTER, IN 46978-0521
PO BOX 522, ROYAL CENTER, IN 46978-0522
PO BOX 523, ROYAL CENTER, IN 46978-0523
PO BOX 524, ROYAL CENTER, IN 46978-0524
PO BOX 525, ROYAL CENTER, IN 46978-0525
PO BOX 526, ROYAL CENTER, IN 46978-0526
PO BOX 527, ROYAL CENTER, IN 46978-0527
PO BOX 528, ROYAL CENTER, IN 46978-0528
PO BOX 529, ROYAL CENTER, IN 46978-0529
PO BOX 530, ROYAL CENTER, IN 46978-0530
PO BOX 531, ROYAL CENTER, IN 46978-0531
PO BOX 532, ROYAL CENTER, IN 46978-0532
PO BOX 533, ROYAL CENTER, IN 46978-0533
PO BOX 534, ROYAL CENTER, IN 46978-0534
PO BOX 535, ROYAL CENTER, IN 46978-0535
PO BOX 536, ROYAL CENTER, IN 46978-0536
PO BOX 537, ROYAL CENTER, IN 46978-0537
PO BOX 538, ROYAL CENTER, IN 46978-0538
PO BOX 539, ROYAL CENTER, IN 46978-0539
PO BOX 540, ROYAL CENTER, IN 46978-0540
PO BOX 541, ROYAL CENTER, IN 46978-0541
PO BOX 542, ROYAL CENTER, IN 46978-0542
PO BOX 543, ROYAL CENTER, IN 46978-0543
PO BOX 544, ROYAL CENTER, IN 46978-0544
PO BOX 545, ROYAL CENTER, IN 46978-0545
PO BOX 546, ROYAL CENTER, IN 46978-0546
PO BOX 547, ROYAL CENTER, IN 46978-0547
PO BOX 548, ROYAL CENTER, IN 46978-0548
PO BOX 549, ROYAL CENTER, IN 46978-0549
PO BOX 550, ROYAL CENTER, IN 46978-0550
PO BOX 551, ROYAL CENTER, IN 46978-0551
PO BOX 552, ROYAL CENTER, IN 46978-0552
PO BOX 553, ROYAL CENTER, IN 46978-0553
PO BOX 554, ROYAL CENTER, IN 46978-0554
PO BOX 555, ROYAL CENTER, IN 46978-0555
PO BOX 556, ROYAL CENTER, IN 46978-0556
PO BOX 557, ROYAL CENTER, IN 46978-0557
PO BOX 558, ROYAL CENTER, IN 46978-0558
PO BOX 559, ROYAL CENTER, IN 46978-0559
PO BOX 560, ROYAL CENTER, IN 46978-0560
PO BOX 561, ROYAL CENTER, IN 46978-0561
PO BOX 562, ROYAL CENTER, IN 46978-0562
PO BOX 563, ROYAL CENTER, IN 46978-0563
PO BOX 564, ROYAL CENTER, IN 46978-0564
PO BOX 565, ROYAL CENTER, IN 46978-0565
PO BOX 566, ROYAL CENTER, IN 46978-0566
PO BOX 567, ROYAL CENTER, IN 46978-0567
PO BOX 568, ROYAL CENTER, IN 46978-0568
PO BOX 569, ROYAL CENTER, IN 46978-0569
PO BOX 570, ROYAL CENTER, IN 46978-0570
PO BOX 571, ROYAL CENTER, IN 46978-0571
PO BOX 572, ROYAL CENTER, IN 46978-0572
PO BOX 573, ROYAL CENTER, IN 46978-0573
PO BOX 574, ROYAL CENTER, IN 46978-0574
PO BOX 575, ROYAL CENTER, IN 46978-0575
PO BOX 576, ROYAL CENTER, IN 46978-0576
PO BOX 577, ROYAL CENTER, IN 46978-0577
PO BOX 578, ROYAL CENTER, IN 46978-0578
PO BOX 579, ROYAL CENTER, IN 46978-0579
PO BOX 580, ROYAL CENTER, IN 46978-0580
PO BOX 581, ROYAL CENTER, IN 46978-0581
PO BOX 582, ROYAL CENTER, IN 46978-0582
PO BOX 583, ROYAL CENTER, IN 46978-0583
PO BOX 584, ROYAL CENTER, IN 46978-0584
PO BOX 585, ROYAL CENTER, IN 46978-0585
PO BOX 586, ROYAL CENTER, IN 46978-0586
PO BOX 587, ROYAL CENTER, IN 46978-0587
PO BOX 588, ROYAL CENTER, IN 46978-0588
PO BOX 589, ROYAL CENTER, IN 46978-0589
PO BOX 590, ROYAL CENTER, IN 46978-0590
PO BOX 591, ROYAL CENTER, IN 46978-0591
PO BOX 592, ROYAL CENTER, IN 46978-0592
PO BOX 593, ROYAL CENTER, IN 46978-0593
PO BOX 594, ROYAL CENTER, IN 46978-0594
PO BOX 595, ROYAL CENTER, IN 46978-0595
PO BOX 596, ROYAL CENTER, IN 46978-0596
PO BOX 597, ROYAL CENTER, IN 46978-0597
PO BOX 598, ROYAL CENTER, IN 46978-0598
PO BOX 599, ROYAL CENTER, IN 46978-0599
PO BOX 600, ROYAL CENTER, IN 46978-0600
PO BOX 601, ROYAL CENTER, IN 46978-0601
PO BOX 602, ROYAL CENTER, IN 46978-0602
PO BOX 603, ROYAL CENTER, IN 46978-0603
PO BOX 604, ROYAL CENTER, IN 46978-0604
PO BOX 605, ROYAL CENTER, IN 46978-0605
PO BOX 606, ROYAL CENTER, IN 46978-0606
PO BOX 607, ROYAL CENTER, IN 46978-0607
PO BOX 608, ROYAL CENTER, IN 46978-0608
PO BOX 609, ROYAL CENTER, IN 46978-0609
PO BOX 610, ROYAL CENTER, IN 46978-0610
PO BOX 611, ROYAL CENTER, IN 46978-0611
PO BOX 612, ROYAL CENTER, IN 46978-0612
PO BOX 613, ROYAL CENTER, IN 46978-0613
PO BOX 614, ROYAL CENTER, IN 46978-0614
PO BOX 615, ROYAL CENTER, IN 46978-0615
PO BOX 616, ROYAL CENTER, IN 46978-0616
PO BOX 617, ROYAL CENTER, IN 46978-0617
PO BOX 618, ROYAL CENTER, IN 46978-0618
PO BOX 619, ROYAL CENTER, IN 46978-0619
PO BOX 620, ROYAL CENTER, IN 46978-0620
PO BOX 621, ROYAL CENTER, IN 46978-0621
PO BOX 622, ROYAL CENTER, IN 46978-0622
PO BOX 623, ROYAL CENTER, IN 46978-0623
PO BOX 624, ROYAL CENTER, IN 46978-0624
PO BOX 625, ROYAL CENTER, IN 46978-0625
PO BOX 626, ROYAL CENTER, IN 46978-0626
PO BOX 627, ROYAL CENTER, IN 46978-0627
PO BOX 628, ROYAL CENTER, IN 46978-0628
PO BOX 629, ROYAL CENTER, IN 46978-0629
PO BOX 630, ROYAL CENTER, IN 46978-0630
PO BOX 631, ROYAL CENTER, IN 46978-0631
PO BOX 632, ROYAL CENTER, IN 46978-0632
PO BOX 633, ROYAL CENTER, IN 46978-0633
PO BOX 634, ROYAL CENTER, IN 46978-0634
PO BOX 635, ROYAL CENTER, IN 46978-0635
PO BOX 636, ROYAL CENTER, IN 46978-0636
PO BOX 637, ROYAL CENTER, IN 46978-0637
PO BOX 638, ROYAL CENTER, IN 46978-0638
PO BOX 639, ROYAL CENTER, IN 46978-0639
PO BOX 640, ROYAL CENTER, IN 46978-0640
PO BOX 641, ROYAL CENTER, IN 46978-0641
PO BOX 642, ROYAL CENTER, IN 46978-0642
PO BOX 643, ROYAL CENTER, IN 46978-0643
PO BOX 644, ROYAL CENTER, IN 46978-0644
PO BOX 645, ROYAL CENTER, IN 46978-0645
PO BOX 646, ROYAL CENTER, IN 46978-0646
PO BOX 647, ROYAL CENTER, IN 46978-0647
PO BOX 648, ROYAL CENTER, IN 46978-0648
PO BOX 649, ROYAL CENTER, IN 46978-0649
PO BOX 650, ROYAL CENTER, IN 46978-0650
PO BOX 651, ROYAL CENTER, IN 46978-0651
PO BOX 652, ROYAL CENTER, IN 46978-0652
PO BOX 653, ROYAL CENTER, IN 46978-0653
PO BOX 654, ROYAL CENTER, IN 46978-0654
PO BOX 655, ROYAL CENTER, IN 46978-0655
PO BOX 656, ROYAL CENTER, IN 46978-0656
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