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 541, DUQUESNE, PA 15110-0541
PO BOX 542, DUQUESNE, PA 15110-0542
PO BOX 543, DUQUESNE, PA 15110-0543
PO BOX 544, DUQUESNE, PA 15110-0544
PO BOX 545, DUQUESNE, PA 15110-0545
PO BOX 546, DUQUESNE, PA 15110-0546
PO BOX 547, DUQUESNE, PA 15110-0547
PO BOX 548, DUQUESNE, PA 15110-0548
PO BOX 549, DUQUESNE, PA 15110-0549
PO BOX 550, DUQUESNE, PA 15110-0550
PO BOX 551, DUQUESNE, PA 15110-0551
PO BOX 552, DUQUESNE, PA 15110-0552
PO BOX 553, DUQUESNE, PA 15110-0553
PO BOX 554, DUQUESNE, PA 15110-0554
PO BOX 555, DUQUESNE, PA 15110-0555
PO BOX 556, DUQUESNE, PA 15110-0556
PO BOX 557, DUQUESNE, PA 15110-0557
PO BOX 558, DUQUESNE, PA 15110-0558
PO BOX 559, DUQUESNE, PA 15110-0559
PO BOX 560, DUQUESNE, PA 15110-0560
PO BOX 561, DUQUESNE, PA 15110-0561
PO BOX 562, DUQUESNE, PA 15110-0562
PO BOX 563, DUQUESNE, PA 15110-0563
PO BOX 564, DUQUESNE, PA 15110-0564
PO BOX 565, DUQUESNE, PA 15110-0565
PO BOX 566, DUQUESNE, PA 15110-0566
PO BOX 567, DUQUESNE, PA 15110-0567
PO BOX 568, DUQUESNE, PA 15110-0568
PO BOX 569, DUQUESNE, PA 15110-0569
PO BOX 570, DUQUESNE, PA 15110-0570
PO BOX 571, DUQUESNE, PA 15110-0571
PO BOX 572, DUQUESNE, PA 15110-0572
PO BOX 573, DUQUESNE, PA 15110-0573
PO BOX 574, DUQUESNE, PA 15110-0574
PO BOX 575, DUQUESNE, PA 15110-0575
PO BOX 576, DUQUESNE, PA 15110-0576
PO BOX 577, DUQUESNE, PA 15110-0577
PO BOX 578, DUQUESNE, PA 15110-0578
PO BOX 579, DUQUESNE, PA 15110-0579
PO BOX 580, DUQUESNE, PA 15110-0580
PO BOX 581, DUQUESNE, PA 15110-0581
PO BOX 582, DUQUESNE, PA 15110-0582
PO BOX 583, DUQUESNE, PA 15110-0583
PO BOX 584, DUQUESNE, PA 15110-0584
PO BOX 585, DUQUESNE, PA 15110-0585
PO BOX 586, DUQUESNE, PA 15110-0586
PO BOX 587, DUQUESNE, PA 15110-0587
PO BOX 588, DUQUESNE, PA 15110-0588
PO BOX 589, DUQUESNE, PA 15110-0589
PO BOX 590, DUQUESNE, PA 15110-0590
PO BOX 591, DUQUESNE, PA 15110-0591
PO BOX 592, DUQUESNE, PA 15110-0592
PO BOX 593, DUQUESNE, PA 15110-0593
PO BOX 594, DUQUESNE, PA 15110-0594
PO BOX 595, DUQUESNE, PA 15110-0595
PO BOX 596, DUQUESNE, PA 15110-0596
PO BOX 597, DUQUESNE, PA 15110-0597
PO BOX 598, DUQUESNE, PA 15110-0598
PO BOX 599, DUQUESNE, PA 15110-0599
PO BOX 600, DUQUESNE, PA 15110-0600
PO BOX 601, DUQUESNE, PA 15110-0601
PO BOX 602, DUQUESNE, PA 15110-0602
PO BOX 603, DUQUESNE, PA 15110-0603
PO BOX 604, DUQUESNE, PA 15110-0604
PO BOX 605, DUQUESNE, PA 15110-0605
PO BOX 606, DUQUESNE, PA 15110-0606
PO BOX 607, DUQUESNE, PA 15110-0607
PO BOX 608, DUQUESNE, PA 15110-0608
PO BOX 609, DUQUESNE, PA 15110-0609
PO BOX 610, DUQUESNE, PA 15110-0610
PO BOX 611, DUQUESNE, PA 15110-0611
PO BOX 612, DUQUESNE, PA 15110-0612
PO BOX 613, DUQUESNE, PA 15110-0613
PO BOX 614, DUQUESNE, PA 15110-0614
PO BOX 615, DUQUESNE, PA 15110-0615
PO BOX 616, DUQUESNE, PA 15110-0616
PO BOX 617, DUQUESNE, PA 15110-0617
PO BOX 618, DUQUESNE, PA 15110-0618
PO BOX 619, DUQUESNE, PA 15110-0619
PO BOX 620, DUQUESNE, PA 15110-0620
PO BOX 621, DUQUESNE, PA 15110-0621
PO BOX 622, DUQUESNE, PA 15110-0622
PO BOX 623, DUQUESNE, PA 15110-0623
PO BOX 624, DUQUESNE, PA 15110-0624
PO BOX 625, DUQUESNE, PA 15110-0625
PO BOX 626, DUQUESNE, PA 15110-0626
PO BOX 627, DUQUESNE, PA 15110-0627
PO BOX 628, DUQUESNE, PA 15110-0628
PO BOX 629, DUQUESNE, PA 15110-0629
PO BOX 630, DUQUESNE, PA 15110-0630
PO BOX 631, DUQUESNE, PA 15110-0631
PO BOX 632, DUQUESNE, PA 15110-0632
PO BOX 633, DUQUESNE, PA 15110-0633
PO BOX 634, DUQUESNE, PA 15110-0634
PO BOX 635, DUQUESNE, PA 15110-0635
PO BOX 636, DUQUESNE, PA 15110-0636
PO BOX 637, DUQUESNE, PA 15110-0637
PO BOX 638, DUQUESNE, PA 15110-0638
PO BOX 639, DUQUESNE, PA 15110-0639
PO BOX 640, DUQUESNE, PA 15110-0640
PO BOX 641, DUQUESNE, PA 15110-0641
PO BOX 642, DUQUESNE, PA 15110-0642
PO BOX 643, DUQUESNE, PA 15110-0643
PO BOX 644, DUQUESNE, PA 15110-0644
PO BOX 645, DUQUESNE, PA 15110-0645
PO BOX 646, DUQUESNE, PA 15110-0646
PO BOX 647, DUQUESNE, PA 15110-0647
PO BOX 648, DUQUESNE, PA 15110-0648
PO BOX 649, DUQUESNE, PA 15110-0649
PO BOX 650, DUQUESNE, PA 15110-0650
PO BOX 651, DUQUESNE, PA 15110-0651
PO BOX 652, DUQUESNE, PA 15110-0652
PO BOX 653, DUQUESNE, PA 15110-0653
PO BOX 654, DUQUESNE, PA 15110-0654
PO BOX 655, DUQUESNE, PA 15110-0655
PO BOX 656, DUQUESNE, PA 15110-0656
PO BOX 657, DUQUESNE, PA 15110-0657
PO BOX 658, DUQUESNE, PA 15110-0658
PO BOX 659, DUQUESNE, PA 15110-0659
PO BOX 660, DUQUESNE, PA 15110-0660
PO BOX 661, DUQUESNE, PA 15110-0661
PO BOX 662, DUQUESNE, PA 15110-0662
PO BOX 663, DUQUESNE, PA 15110-0663
PO BOX 664, DUQUESNE, PA 15110-0664
PO BOX 665, DUQUESNE, PA 15110-0665
PO BOX 666, DUQUESNE, PA 15110-0666
PO BOX 667, DUQUESNE, PA 15110-0667
PO BOX 668, DUQUESNE, PA 15110-0668
PO BOX 669, DUQUESNE, PA 15110-0669
PO BOX 670, DUQUESNE, PA 15110-0670
PO BOX 671, DUQUESNE, PA 15110-0671
PO BOX 672, DUQUESNE, PA 15110-0672
PO BOX 673, DUQUESNE, PA 15110-0673
PO BOX 674, DUQUESNE, PA 15110-0674
PO BOX 675, DUQUESNE, PA 15110-0675
PO BOX 676, DUQUESNE, PA 15110-0676
PO BOX 677, DUQUESNE, PA 15110-0677
PO BOX 678, DUQUESNE, PA 15110-0678
PO BOX 679, DUQUESNE, PA 15110-0679
PO BOX 680, DUQUESNE, PA 15110-0680
PO BOX 681, DUQUESNE, PA 15110-0681
PO BOX 682, DUQUESNE, PA 15110-0682
PO BOX 683, DUQUESNE, PA 15110-0683
PO BOX 684, DUQUESNE, PA 15110-0684
PO BOX 685, DUQUESNE, PA 15110-0685
PO BOX 686, DUQUESNE, PA 15110-0686
PO BOX 687, DUQUESNE, PA 15110-0687
PO BOX 688, DUQUESNE, PA 15110-0688
PO BOX 689, DUQUESNE, PA 15110-0689
PO BOX 690, DUQUESNE, PA 15110-0690
PO BOX 691, DUQUESNE, PA 15110-0691
PO BOX 692, DUQUESNE, PA 15110-0692
PO BOX 693, DUQUESNE, PA 15110-0693
PO BOX 694, DUQUESNE, PA 15110-0694
PO BOX 695, DUQUESNE, PA 15110-0695
PO BOX 696, DUQUESNE, PA 15110-0696
PO BOX 697, DUQUESNE, PA 15110-0697
PO BOX 698, DUQUESNE, PA 15110-0698
PO BOX 699, DUQUESNE, PA 15110-0699
PO BOX 700, DUQUESNE, PA 15110-0700
PO BOX 701, DUQUESNE, PA 15110-0701
PO BOX 702, DUQUESNE, PA 15110-0702
PO BOX 703, DUQUESNE, PA 15110-0703
PO BOX 704, DUQUESNE, PA 15110-0704
PO BOX 705, DUQUESNE, PA 15110-0705
PO BOX 706, DUQUESNE, PA 15110-0706
PO BOX 707, DUQUESNE, PA 15110-0707
PO BOX 708, DUQUESNE, PA 15110-0708
PO BOX 709, DUQUESNE, PA 15110-0709
PO BOX 710, DUQUESNE, PA 15110-0710
PO BOX 711, DUQUESNE, PA 15110-0711
PO BOX 712, DUQUESNE, PA 15110-0712
PO BOX 713, DUQUESNE, PA 15110-0713
PO BOX 714, DUQUESNE, PA 15110-0714
PO BOX 715, DUQUESNE, PA 15110-0715
PO BOX 716, DUQUESNE, PA 15110-0716
PO BOX 717, DUQUESNE, PA 15110-0717
PO BOX 718, DUQUESNE, PA 15110-0718
PO BOX 719, DUQUESNE, PA 15110-0719
PO BOX 720, DUQUESNE, PA 15110-0720
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