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, FORT MILL, SC 29716-0481
PO BOX 482, FORT MILL, SC 29716-0482
PO BOX 483, FORT MILL, SC 29716-0483
PO BOX 484, FORT MILL, SC 29716-0484
PO BOX 485, FORT MILL, SC 29716-0485
PO BOX 486, FORT MILL, SC 29716-0486
PO BOX 487, FORT MILL, SC 29716-0487
PO BOX 488, FORT MILL, SC 29716-0488
PO BOX 489, FORT MILL, SC 29716-0489
PO BOX 490, FORT MILL, SC 29716-0490
PO BOX 491, FORT MILL, SC 29716-0491
PO BOX 492, FORT MILL, SC 29716-0492
PO BOX 493, FORT MILL, SC 29716-0493
PO BOX 494, FORT MILL, SC 29716-0494
PO BOX 495, FORT MILL, SC 29716-0495
PO BOX 496, FORT MILL, SC 29716-0496
PO BOX 497, FORT MILL, SC 29716-0497
PO BOX 498, FORT MILL, SC 29716-0498
PO BOX 499, FORT MILL, SC 29716-0499
PO BOX 500, FORT MILL, SC 29716-0500
PO BOX 501, FORT MILL, SC 29716-0501
PO BOX 502, FORT MILL, SC 29716-0502
PO BOX 503, FORT MILL, SC 29716-0503
PO BOX 504, FORT MILL, SC 29716-0504
PO BOX 505, FORT MILL, SC 29716-0505
PO BOX 506, FORT MILL, SC 29716-0506
PO BOX 507, FORT MILL, SC 29716-0507
PO BOX 508, FORT MILL, SC 29716-0508
PO BOX 509, FORT MILL, SC 29716-0509
PO BOX 510, FORT MILL, SC 29716-0510
PO BOX 511, FORT MILL, SC 29716-0511
PO BOX 512, FORT MILL, SC 29716-0512
PO BOX 513, FORT MILL, SC 29716-0513
PO BOX 514, FORT MILL, SC 29716-0514
PO BOX 515, FORT MILL, SC 29716-0515
PO BOX 516, FORT MILL, SC 29716-0516
PO BOX 517, FORT MILL, SC 29716-0517
PO BOX 518, FORT MILL, SC 29716-0518
PO BOX 519, FORT MILL, SC 29716-0519
PO BOX 520, FORT MILL, SC 29716-0520
PO BOX 521, FORT MILL, SC 29716-0521
PO BOX 522, FORT MILL, SC 29716-0522
PO BOX 523, FORT MILL, SC 29716-0523
PO BOX 524, FORT MILL, SC 29716-0524
PO BOX 525, FORT MILL, SC 29716-0525
PO BOX 526, FORT MILL, SC 29716-0526
PO BOX 527, FORT MILL, SC 29716-0527
PO BOX 528, FORT MILL, SC 29716-0528
PO BOX 529, FORT MILL, SC 29716-0529
PO BOX 530, FORT MILL, SC 29716-0530
PO BOX 531, FORT MILL, SC 29716-0531
PO BOX 532, FORT MILL, SC 29716-0532
PO BOX 533, FORT MILL, SC 29716-0533
PO BOX 534, FORT MILL, SC 29716-0534
PO BOX 535, FORT MILL, SC 29716-0535
PO BOX 536, FORT MILL, SC 29716-0536
PO BOX 537, FORT MILL, SC 29716-0537
PO BOX 538, FORT MILL, SC 29716-0538
PO BOX 539, FORT MILL, SC 29716-0539
PO BOX 540, FORT MILL, SC 29716-0540
PO BOX 541, FORT MILL, SC 29716-0541
PO BOX 542, FORT MILL, SC 29716-0542
PO BOX 543, FORT MILL, SC 29716-0543
PO BOX 544, FORT MILL, SC 29716-0544
PO BOX 545, FORT MILL, SC 29716-0545
PO BOX 546, FORT MILL, SC 29716-0546
PO BOX 547, FORT MILL, SC 29716-0547
PO BOX 548, FORT MILL, SC 29716-0548
PO BOX 549, FORT MILL, SC 29716-0549
PO BOX 550, FORT MILL, SC 29716-0550
PO BOX 551, FORT MILL, SC 29716-0551
PO BOX 552, FORT MILL, SC 29716-0552
PO BOX 553, FORT MILL, SC 29716-0553
PO BOX 554, FORT MILL, SC 29716-0554
PO BOX 555, FORT MILL, SC 29716-0555
PO BOX 556, FORT MILL, SC 29716-0556
PO BOX 557, FORT MILL, SC 29716-0557
PO BOX 558, FORT MILL, SC 29716-0558
PO BOX 559, FORT MILL, SC 29716-0559
PO BOX 560, FORT MILL, SC 29716-0560
PO BOX 561, FORT MILL, SC 29716-0561
PO BOX 562, FORT MILL, SC 29716-0562
PO BOX 563, FORT MILL, SC 29716-0563
PO BOX 564, FORT MILL, SC 29716-0564
PO BOX 565, FORT MILL, SC 29716-0565
PO BOX 566, FORT MILL, SC 29716-0566
PO BOX 567, FORT MILL, SC 29716-0567
PO BOX 568, FORT MILL, SC 29716-0568
PO BOX 569, FORT MILL, SC 29716-0569
PO BOX 570, FORT MILL, SC 29716-0570
PO BOX 571, FORT MILL, SC 29716-0571
PO BOX 572, FORT MILL, SC 29716-0572
PO BOX 573, FORT MILL, SC 29716-0573
PO BOX 574, FORT MILL, SC 29716-0574
PO BOX 575, FORT MILL, SC 29716-0575
PO BOX 576, FORT MILL, SC 29716-0576
PO BOX 577, FORT MILL, SC 29716-0577
PO BOX 578, FORT MILL, SC 29716-0578
PO BOX 579, FORT MILL, SC 29716-0579
PO BOX 580, FORT MILL, SC 29716-0580
PO BOX 581, FORT MILL, SC 29716-0581
PO BOX 582, FORT MILL, SC 29716-0582
PO BOX 583, FORT MILL, SC 29716-0583
PO BOX 584, FORT MILL, SC 29716-0584
PO BOX 585, FORT MILL, SC 29716-0585
PO BOX 586, FORT MILL, SC 29716-0586
PO BOX 587, FORT MILL, SC 29716-0587
PO BOX 588, FORT MILL, SC 29716-0588
PO BOX 589, FORT MILL, SC 29716-0589
PO BOX 590, FORT MILL, SC 29716-0590
PO BOX 591, FORT MILL, SC 29716-0591
PO BOX 592, FORT MILL, SC 29716-0592
PO BOX 593, FORT MILL, SC 29716-0593
PO BOX 594, FORT MILL, SC 29716-0594
PO BOX 595, FORT MILL, SC 29716-0595
PO BOX 596, FORT MILL, SC 29716-0596
PO BOX 597, FORT MILL, SC 29716-0597
PO BOX 598, FORT MILL, SC 29716-0598
PO BOX 599, FORT MILL, SC 29716-0599
PO BOX 600, FORT MILL, SC 29716-0600
PO BOX 601, FORT MILL, SC 29716-0601
PO BOX 602, FORT MILL, SC 29716-0602
PO BOX 603, FORT MILL, SC 29716-0603
PO BOX 604, FORT MILL, SC 29716-0604
PO BOX 605, FORT MILL, SC 29716-0605
PO BOX 606, FORT MILL, SC 29716-0606
PO BOX 607, FORT MILL, SC 29716-0607
PO BOX 608, FORT MILL, SC 29716-0608
PO BOX 609, FORT MILL, SC 29716-0609
PO BOX 610, FORT MILL, SC 29716-0610
PO BOX 611, FORT MILL, SC 29716-0611
PO BOX 612, FORT MILL, SC 29716-0612
PO BOX 613, FORT MILL, SC 29716-0613
PO BOX 614, FORT MILL, SC 29716-0614
PO BOX 615, FORT MILL, SC 29716-0615
PO BOX 616, FORT MILL, SC 29716-0616
PO BOX 617, FORT MILL, SC 29716-0617
PO BOX 618, FORT MILL, SC 29716-0618
PO BOX 619, FORT MILL, SC 29716-0619
PO BOX 620, FORT MILL, SC 29716-0620
PO BOX 621, FORT MILL, SC 29716-0621
PO BOX 622, FORT MILL, SC 29716-0622
PO BOX 623, FORT MILL, SC 29716-0623
PO BOX 624, FORT MILL, SC 29716-0624
PO BOX 625, FORT MILL, SC 29716-0625
PO BOX 626, FORT MILL, SC 29716-0626
PO BOX 627, FORT MILL, SC 29716-0627
PO BOX 628, FORT MILL, SC 29716-0628
PO BOX 629, FORT MILL, SC 29716-0629
PO BOX 630, FORT MILL, SC 29716-0630
PO BOX 631, FORT MILL, SC 29716-0631
PO BOX 632, FORT MILL, SC 29716-0632
PO BOX 633, FORT MILL, SC 29716-0633
PO BOX 634, FORT MILL, SC 29716-0634
PO BOX 635, FORT MILL, SC 29716-0635
PO BOX 636, FORT MILL, SC 29716-0636
PO BOX 637, FORT MILL, SC 29716-0637
PO BOX 638, FORT MILL, SC 29716-0638
PO BOX 639, FORT MILL, SC 29716-0639
PO BOX 640, FORT MILL, SC 29716-0640
PO BOX 641, FORT MILL, SC 29716-0641
PO BOX 642, FORT MILL, SC 29716-0642
PO BOX 643, FORT MILL, SC 29716-0643
PO BOX 644, FORT MILL, SC 29716-0644
PO BOX 645, FORT MILL, SC 29716-0645
PO BOX 646, FORT MILL, SC 29716-0646
PO BOX 647, FORT MILL, SC 29716-0647
PO BOX 648, FORT MILL, SC 29716-0648
PO BOX 649, FORT MILL, SC 29716-0649
PO BOX 650, FORT MILL, SC 29716-0650
PO BOX 651, FORT MILL, SC 29716-0651
PO BOX 652, FORT MILL, SC 29716-0652
PO BOX 653, FORT MILL, SC 29716-0653
PO BOX 654, FORT MILL, SC 29716-0654
PO BOX 655, FORT MILL, SC 29716-0655
PO BOX 656, FORT MILL, SC 29716-0656
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