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, ARDMORE, PA 19003-0481
PO BOX 482, ARDMORE, PA 19003-0482
PO BOX 483, ARDMORE, PA 19003-0483
PO BOX 484, ARDMORE, PA 19003-0484
PO BOX 485, ARDMORE, PA 19003-0485
PO BOX 486, ARDMORE, PA 19003-0486
PO BOX 487, ARDMORE, PA 19003-0487
PO BOX 488, ARDMORE, PA 19003-0488
PO BOX 489, ARDMORE, PA 19003-0489
PO BOX 490, ARDMORE, PA 19003-0490
PO BOX 491, ARDMORE, PA 19003-0491
PO BOX 492, ARDMORE, PA 19003-0492
PO BOX 493, ARDMORE, PA 19003-0493
PO BOX 494, ARDMORE, PA 19003-0494
PO BOX 495, ARDMORE, PA 19003-0495
PO BOX 496, ARDMORE, PA 19003-0496
PO BOX 497, ARDMORE, PA 19003-0497
PO BOX 498, ARDMORE, PA 19003-0498
PO BOX 499, ARDMORE, PA 19003-0499
PO BOX 500, ARDMORE, PA 19003-0500
PO BOX 501, ARDMORE, PA 19003-0501
PO BOX 502, ARDMORE, PA 19003-0502
PO BOX 503, ARDMORE, PA 19003-0503
PO BOX 504, ARDMORE, PA 19003-0504
PO BOX 505, ARDMORE, PA 19003-0505
PO BOX 506, ARDMORE, PA 19003-0506
PO BOX 507, ARDMORE, PA 19003-0507
PO BOX 508, ARDMORE, PA 19003-0508
PO BOX 509, ARDMORE, PA 19003-0509
PO BOX 510, ARDMORE, PA 19003-0510
PO BOX 511, ARDMORE, PA 19003-0511
PO BOX 512, ARDMORE, PA 19003-0512
PO BOX 513, ARDMORE, PA 19003-0513
PO BOX 514, ARDMORE, PA 19003-0514
PO BOX 515, ARDMORE, PA 19003-0515
PO BOX 516, ARDMORE, PA 19003-0516
PO BOX 517, ARDMORE, PA 19003-0517
PO BOX 518, ARDMORE, PA 19003-0518
PO BOX 519, ARDMORE, PA 19003-0519
PO BOX 520, ARDMORE, PA 19003-0520
PO BOX 521, ARDMORE, PA 19003-0521
PO BOX 522, ARDMORE, PA 19003-0522
PO BOX 523, ARDMORE, PA 19003-0523
PO BOX 524, ARDMORE, PA 19003-0524
PO BOX 525, ARDMORE, PA 19003-0525
PO BOX 526, ARDMORE, PA 19003-0526
PO BOX 527, ARDMORE, PA 19003-0527
PO BOX 528, ARDMORE, PA 19003-0528
PO BOX 529, ARDMORE, PA 19003-0529
PO BOX 530, ARDMORE, PA 19003-0530
PO BOX 531, ARDMORE, PA 19003-0531
PO BOX 532, ARDMORE, PA 19003-0532
PO BOX 533, ARDMORE, PA 19003-0533
PO BOX 534, ARDMORE, PA 19003-0534
PO BOX 535, ARDMORE, PA 19003-0535
PO BOX 536, ARDMORE, PA 19003-0536
PO BOX 537, ARDMORE, PA 19003-0537
PO BOX 538, ARDMORE, PA 19003-0538
PO BOX 539, ARDMORE, PA 19003-0539
PO BOX 540, ARDMORE, PA 19003-0540
PO BOX 541, ARDMORE, PA 19003-0541
PO BOX 542, ARDMORE, PA 19003-0542
PO BOX 543, ARDMORE, PA 19003-0543
PO BOX 544, ARDMORE, PA 19003-0544
PO BOX 545, ARDMORE, PA 19003-0545
PO BOX 546, ARDMORE, PA 19003-0546
PO BOX 547, ARDMORE, PA 19003-0547
PO BOX 548, ARDMORE, PA 19003-0548
PO BOX 549, ARDMORE, PA 19003-0549
PO BOX 550, ARDMORE, PA 19003-0550
PO BOX 551, ARDMORE, PA 19003-0551
PO BOX 552, ARDMORE, PA 19003-0552
PO BOX 553, ARDMORE, PA 19003-0553
PO BOX 554, ARDMORE, PA 19003-0554
PO BOX 555, ARDMORE, PA 19003-0555
PO BOX 556, ARDMORE, PA 19003-0556
PO BOX 557, ARDMORE, PA 19003-0557
PO BOX 558, ARDMORE, PA 19003-0558
PO BOX 559, ARDMORE, PA 19003-0559
PO BOX 560, ARDMORE, PA 19003-0560
PO BOX 561, ARDMORE, PA 19003-0561
PO BOX 562, ARDMORE, PA 19003-0562
PO BOX 563, ARDMORE, PA 19003-0563
PO BOX 564, ARDMORE, PA 19003-0564
PO BOX 565, ARDMORE, PA 19003-0565
PO BOX 566, ARDMORE, PA 19003-0566
PO BOX 567, ARDMORE, PA 19003-0567
PO BOX 568, ARDMORE, PA 19003-0568
PO BOX 569, ARDMORE, PA 19003-0569
PO BOX 570, ARDMORE, PA 19003-0570
PO BOX 571, ARDMORE, PA 19003-0571
PO BOX 572, ARDMORE, PA 19003-0572
PO BOX 573, ARDMORE, PA 19003-0573
PO BOX 574, ARDMORE, PA 19003-0574
PO BOX 575, ARDMORE, PA 19003-0575
PO BOX 576, ARDMORE, PA 19003-0576
PO BOX 577, ARDMORE, PA 19003-0577
PO BOX 578, ARDMORE, PA 19003-0578
PO BOX 579, ARDMORE, PA 19003-0579
PO BOX 580, ARDMORE, PA 19003-0580
PO BOX 581, ARDMORE, PA 19003-0581
PO BOX 582, ARDMORE, PA 19003-0582
PO BOX 583, ARDMORE, PA 19003-0583
PO BOX 584, ARDMORE, PA 19003-0584
PO BOX 585, ARDMORE, PA 19003-0585
PO BOX 586, ARDMORE, PA 19003-0586
PO BOX 587, ARDMORE, PA 19003-0587
PO BOX 588, ARDMORE, PA 19003-0588
PO BOX 589, ARDMORE, PA 19003-0589
PO BOX 590, ARDMORE, PA 19003-0590
PO BOX 591, ARDMORE, PA 19003-0591
PO BOX 592, ARDMORE, PA 19003-0592
PO BOX 593, ARDMORE, PA 19003-0593
PO BOX 594, ARDMORE, PA 19003-0594
PO BOX 595, ARDMORE, PA 19003-0595
PO BOX 596, ARDMORE, PA 19003-0596
PO BOX 597, ARDMORE, PA 19003-0597
PO BOX 598, ARDMORE, PA 19003-0598
PO BOX 599, ARDMORE, PA 19003-0599
PO BOX 600, ARDMORE, PA 19003-0600
PO BOX 601, ARDMORE, PA 19003-0601
PO BOX 602, ARDMORE, PA 19003-0602
PO BOX 603, ARDMORE, PA 19003-0603
PO BOX 604, ARDMORE, PA 19003-0604
PO BOX 605, ARDMORE, PA 19003-0605
PO BOX 606, ARDMORE, PA 19003-0606
PO BOX 607, ARDMORE, PA 19003-0607
PO BOX 608, ARDMORE, PA 19003-0608
PO BOX 609, ARDMORE, PA 19003-0609
PO BOX 610, ARDMORE, PA 19003-0610
PO BOX 611, ARDMORE, PA 19003-0611
PO BOX 612, ARDMORE, PA 19003-0612
PO BOX 613, ARDMORE, PA 19003-0613
PO BOX 614, ARDMORE, PA 19003-0614
PO BOX 615, ARDMORE, PA 19003-0615
PO BOX 616, ARDMORE, PA 19003-0616
PO BOX 617, ARDMORE, PA 19003-0617
PO BOX 618, ARDMORE, PA 19003-0618
PO BOX 619, ARDMORE, PA 19003-0619
PO BOX 620, ARDMORE, PA 19003-0620
PO BOX 621, ARDMORE, PA 19003-0621
PO BOX 622, ARDMORE, PA 19003-0622
PO BOX 623, ARDMORE, PA 19003-0623
PO BOX 624, ARDMORE, PA 19003-0624
PO BOX 625, ARDMORE, PA 19003-0625
PO BOX 626, ARDMORE, PA 19003-0626
PO BOX 627, ARDMORE, PA 19003-0627
PO BOX 628, ARDMORE, PA 19003-0628
PO BOX 629, ARDMORE, PA 19003-0629
PO BOX 630, ARDMORE, PA 19003-0630
PO BOX 631, ARDMORE, PA 19003-0631
PO BOX 632, ARDMORE, PA 19003-0632
PO BOX 633, ARDMORE, PA 19003-0633
PO BOX 634, ARDMORE, PA 19003-0634
PO BOX 635, ARDMORE, PA 19003-0635
PO BOX 636, ARDMORE, PA 19003-0636
PO BOX 637, ARDMORE, PA 19003-0637
PO BOX 638, ARDMORE, PA 19003-0638
PO BOX 639, ARDMORE, PA 19003-0639
PO BOX 640, ARDMORE, PA 19003-0640
PO BOX 641, ARDMORE, PA 19003-0641
PO BOX 642, ARDMORE, PA 19003-0642
PO BOX 643, ARDMORE, PA 19003-0643
PO BOX 644, ARDMORE, PA 19003-0644
PO BOX 645, ARDMORE, PA 19003-0645
PO BOX 646, ARDMORE, PA 19003-0646
PO BOX 647, ARDMORE, PA 19003-0647
PO BOX 648, ARDMORE, PA 19003-0648
PO BOX 649, ARDMORE, PA 19003-0649
PO BOX 650, ARDMORE, PA 19003-0650
PO BOX 651, ARDMORE, PA 19003-0651
PO BOX 652, ARDMORE, PA 19003-0652
PO BOX 653, ARDMORE, PA 19003-0653
PO BOX 654, ARDMORE, PA 19003-0654
PO BOX 655, ARDMORE, PA 19003-0655
PO BOX 656, ARDMORE, PA 19003-0656
PO BOX 657, ARDMORE, PA 19003-0657
PO BOX 658, ARDMORE, PA 19003-0658
PO BOX 659, ARDMORE, PA 19003-0659
PO BOX 660, ARDMORE, PA 19003-0660
PO BOX 661, ARDMORE, PA 19003-0661
PO BOX 662, ARDMORE, PA 19003-0662
PO BOX 663, ARDMORE, PA 19003-0663
PO BOX 664, ARDMORE, PA 19003-0664
PO BOX 665, ARDMORE, PA 19003-0665
PO BOX 666, ARDMORE, PA 19003-0666
PO BOX 667, ARDMORE, PA 19003-0667
PO BOX 668, ARDMORE, PA 19003-0668
PO BOX 669, ARDMORE, PA 19003-0669
PO BOX 670, ARDMORE, PA 19003-0670
PO BOX 671, ARDMORE, PA 19003-0671
PO BOX 672, ARDMORE, PA 19003-0672
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