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 5481, JOHNSTOWN, PA 15904-5481
PO BOX 5482, JOHNSTOWN, PA 15904-5482
PO BOX 5483, JOHNSTOWN, PA 15904-5483
PO BOX 5484, JOHNSTOWN, PA 15904-5484
PO BOX 5485, JOHNSTOWN, PA 15904-5485
PO BOX 5486, JOHNSTOWN, PA 15904-5486
PO BOX 5487, JOHNSTOWN, PA 15904-5487
PO BOX 5488, JOHNSTOWN, PA 15904-5488
PO BOX 5489, JOHNSTOWN, PA 15904-5489
PO BOX 5490, JOHNSTOWN, PA 15904-5490
PO BOX 5491, JOHNSTOWN, PA 15904-5491
PO BOX 5492, JOHNSTOWN, PA 15904-5492
PO BOX 5493, JOHNSTOWN, PA 15904-5493
PO BOX 5494, JOHNSTOWN, PA 15904-5494
PO BOX 5495, JOHNSTOWN, PA 15904-5495
PO BOX 5496, JOHNSTOWN, PA 15904-5496
PO BOX 5497, JOHNSTOWN, PA 15904-5497
PO BOX 5498, JOHNSTOWN, PA 15904-5498
PO BOX 5499, JOHNSTOWN, PA 15904-5499
PO BOX 5500, JOHNSTOWN, PA 15904-5500
PO BOX 5501, JOHNSTOWN, PA 15904-5501
PO BOX 5502, JOHNSTOWN, PA 15904-5502
PO BOX 5503, JOHNSTOWN, PA 15904-5503
PO BOX 5504, JOHNSTOWN, PA 15904-5504
PO BOX 5505, JOHNSTOWN, PA 15904-5505
PO BOX 5506, JOHNSTOWN, PA 15904-5506
PO BOX 5507, JOHNSTOWN, PA 15904-5507
PO BOX 5508, JOHNSTOWN, PA 15904-5508
PO BOX 5509, JOHNSTOWN, PA 15904-5509
PO BOX 5510, JOHNSTOWN, PA 15904-5510
PO BOX 5511, JOHNSTOWN, PA 15904-5511
PO BOX 5512, JOHNSTOWN, PA 15904-5512
PO BOX 5513, JOHNSTOWN, PA 15904-5513
PO BOX 5514, JOHNSTOWN, PA 15904-5514
PO BOX 5515, JOHNSTOWN, PA 15904-5515
PO BOX 5516, JOHNSTOWN, PA 15904-5516
PO BOX 5517, JOHNSTOWN, PA 15904-5517
PO BOX 5518, JOHNSTOWN, PA 15904-5518
PO BOX 5519, JOHNSTOWN, PA 15904-5519
PO BOX 5520, JOHNSTOWN, PA 15904-5520
PO BOX 5521, JOHNSTOWN, PA 15904-5521
PO BOX 5522, JOHNSTOWN, PA 15904-5522
PO BOX 5523, JOHNSTOWN, PA 15904-5523
PO BOX 5524, JOHNSTOWN, PA 15904-5524
PO BOX 5525, JOHNSTOWN, PA 15904-5525
PO BOX 5526, JOHNSTOWN, PA 15904-5526
PO BOX 5527, JOHNSTOWN, PA 15904-5527
PO BOX 5528, JOHNSTOWN, PA 15904-5528
PO BOX 5529, JOHNSTOWN, PA 15904-5529
PO BOX 5530, JOHNSTOWN, PA 15904-5530
PO BOX 5531, JOHNSTOWN, PA 15904-5531
PO BOX 5532, JOHNSTOWN, PA 15904-5532
PO BOX 5533, JOHNSTOWN, PA 15904-5533
PO BOX 5534, JOHNSTOWN, PA 15904-5534
PO BOX 5535, JOHNSTOWN, PA 15904-5535
PO BOX 5536, JOHNSTOWN, PA 15904-5536
PO BOX 5537, JOHNSTOWN, PA 15904-5537
PO BOX 5538, JOHNSTOWN, PA 15904-5538
PO BOX 5539, JOHNSTOWN, PA 15904-5539
PO BOX 5540, JOHNSTOWN, PA 15904-5540
PO BOX 5541, JOHNSTOWN, PA 15904-5541
PO BOX 5542, JOHNSTOWN, PA 15904-5542
PO BOX 5543, JOHNSTOWN, PA 15904-5543
PO BOX 5544, JOHNSTOWN, PA 15904-5544
PO BOX 5545, JOHNSTOWN, PA 15904-5545
PO BOX 5546, JOHNSTOWN, PA 15904-5546
PO BOX 5547, JOHNSTOWN, PA 15904-5547
PO BOX 5548, JOHNSTOWN, PA 15904-5548
PO BOX 5549, JOHNSTOWN, PA 15904-5549
PO BOX 5550, JOHNSTOWN, PA 15904-5550
PO BOX 5551, JOHNSTOWN, PA 15904-5551
PO BOX 5552, JOHNSTOWN, PA 15904-5552
PO BOX 5553, JOHNSTOWN, PA 15904-5553
PO BOX 5554, JOHNSTOWN, PA 15904-5554
PO BOX 5555, JOHNSTOWN, PA 15904-5555
PO BOX 5556, JOHNSTOWN, PA 15904-5556
PO BOX 5557, JOHNSTOWN, PA 15904-5557
PO BOX 5558, JOHNSTOWN, PA 15904-5558
PO BOX 5559, JOHNSTOWN, PA 15904-5559
PO BOX 5560, JOHNSTOWN, PA 15904-5560
PO BOX 5561, JOHNSTOWN, PA 15904-5561
PO BOX 5562, JOHNSTOWN, PA 15904-5562
PO BOX 5563, JOHNSTOWN, PA 15904-5563
PO BOX 5564, JOHNSTOWN, PA 15904-5564
PO BOX 5565, JOHNSTOWN, PA 15904-5565
PO BOX 5566, JOHNSTOWN, PA 15904-5566
PO BOX 5567, JOHNSTOWN, PA 15904-5567
PO BOX 5568, JOHNSTOWN, PA 15904-5568
PO BOX 5569, JOHNSTOWN, PA 15904-5569
PO BOX 5570, JOHNSTOWN, PA 15904-5570
PO BOX 5571, JOHNSTOWN, PA 15904-5571
PO BOX 5572, JOHNSTOWN, PA 15904-5572
PO BOX 5573, JOHNSTOWN, PA 15904-5573
PO BOX 5574, JOHNSTOWN, PA 15904-5574
PO BOX 5575, JOHNSTOWN, PA 15904-5575
PO BOX 5576, JOHNSTOWN, PA 15904-5576
PO BOX 5577, JOHNSTOWN, PA 15904-5577
PO BOX 5578, JOHNSTOWN, PA 15904-5578
PO BOX 5579, JOHNSTOWN, PA 15904-5579
PO BOX 5580, JOHNSTOWN, PA 15904-5580
PO BOX 5581, JOHNSTOWN, PA 15904-5581
PO BOX 5582, JOHNSTOWN, PA 15904-5582
PO BOX 5583, JOHNSTOWN, PA 15904-5583
PO BOX 5584, JOHNSTOWN, PA 15904-5584
PO BOX 5585, JOHNSTOWN, PA 15904-5585
PO BOX 5586, JOHNSTOWN, PA 15904-5586
PO BOX 5587, JOHNSTOWN, PA 15904-5587
PO BOX 5588, JOHNSTOWN, PA 15904-5588
PO BOX 5589, JOHNSTOWN, PA 15904-5589
PO BOX 5590, JOHNSTOWN, PA 15904-5590
PO BOX 5591, JOHNSTOWN, PA 15904-5591
PO BOX 5592, JOHNSTOWN, PA 15904-5592
PO BOX 5593, JOHNSTOWN, PA 15904-5593
PO BOX 5594, JOHNSTOWN, PA 15904-5594
PO BOX 5595, JOHNSTOWN, PA 15904-5595
PO BOX 5596, JOHNSTOWN, PA 15904-5596
PO BOX 5597, JOHNSTOWN, PA 15904-5597
PO BOX 5598, JOHNSTOWN, PA 15904-5598
PO BOX 5599, JOHNSTOWN, PA 15904-5599
PO BOX 5600, JOHNSTOWN, PA 15904-5600
PO BOX 5601, JOHNSTOWN, PA 15904-5601
PO BOX 5602, JOHNSTOWN, PA 15904-5602
PO BOX 5603, JOHNSTOWN, PA 15904-5603
PO BOX 5604, JOHNSTOWN, PA 15904-5604
PO BOX 5605, JOHNSTOWN, PA 15904-5605
PO BOX 5606, JOHNSTOWN, PA 15904-5606
PO BOX 5607, JOHNSTOWN, PA 15904-5607
PO BOX 5608, JOHNSTOWN, PA 15904-5608
PO BOX 5609, JOHNSTOWN, PA 15904-5609
PO BOX 5610, JOHNSTOWN, PA 15904-5610
PO BOX 5611, JOHNSTOWN, PA 15904-5611
PO BOX 5612, JOHNSTOWN, PA 15904-5612
PO BOX 5613, JOHNSTOWN, PA 15904-5613
PO BOX 5614, JOHNSTOWN, PA 15904-5614
PO BOX 5615, JOHNSTOWN, PA 15904-5615
PO BOX 5616, JOHNSTOWN, PA 15904-5616
PO BOX 5617, JOHNSTOWN, PA 15904-5617
PO BOX 5618, JOHNSTOWN, PA 15904-5618
PO BOX 5619, JOHNSTOWN, PA 15904-5619
PO BOX 5620, JOHNSTOWN, PA 15904-5620
PO BOX 5621, JOHNSTOWN, PA 15904-5621
PO BOX 5622, JOHNSTOWN, PA 15904-5622
PO BOX 5623, JOHNSTOWN, PA 15904-5623
PO BOX 5624, JOHNSTOWN, PA 15904-5624
PO BOX 5625, JOHNSTOWN, PA 15904-5625
PO BOX 5626, JOHNSTOWN, PA 15904-5626
PO BOX 5627, JOHNSTOWN, PA 15904-5627
PO BOX 5628, JOHNSTOWN, PA 15904-5628
PO BOX 5629, JOHNSTOWN, PA 15904-5629
PO BOX 5630, JOHNSTOWN, PA 15904-5630
PO BOX 5631, JOHNSTOWN, PA 15904-5631
PO BOX 5632, JOHNSTOWN, PA 15904-5632
PO BOX 5633, JOHNSTOWN, PA 15904-5633
PO BOX 5634, JOHNSTOWN, PA 15904-5634
PO BOX 5635, JOHNSTOWN, PA 15904-5635
PO BOX 5636, JOHNSTOWN, PA 15904-5636
PO BOX 5637, JOHNSTOWN, PA 15904-5637
PO BOX 5638, JOHNSTOWN, PA 15904-5638
PO BOX 5639, JOHNSTOWN, PA 15904-5639
PO BOX 5640, JOHNSTOWN, PA 15904-5640
PO BOX 5641, JOHNSTOWN, PA 15904-5641
PO BOX 5642, JOHNSTOWN, PA 15904-5642
PO BOX 5643, JOHNSTOWN, PA 15904-5643
PO BOX 5644, JOHNSTOWN, PA 15904-5644
PO BOX 5645, JOHNSTOWN, PA 15904-5645
PO BOX 5646, JOHNSTOWN, PA 15904-5646
PO BOX 5647, JOHNSTOWN, PA 15904-5647
PO BOX 5648, JOHNSTOWN, PA 15904-5648
PO BOX 5649, JOHNSTOWN, PA 15904-5649
PO BOX 5650, JOHNSTOWN, PA 15904-5650
PO BOX 5651, JOHNSTOWN, PA 15904-5651
PO BOX 5652, JOHNSTOWN, PA 15904-5652
PO BOX 5653, JOHNSTOWN, PA 15904-5653
PO BOX 5654, JOHNSTOWN, PA 15904-5654
PO BOX 5655, JOHNSTOWN, PA 15904-5655
PO BOX 5656, JOHNSTOWN, PA 15904-5656
PO BOX 5657, JOHNSTOWN, PA 15904-5657
PO BOX 5658, JOHNSTOWN, PA 15904-5658
PO BOX 5659, JOHNSTOWN, PA 15904-5659
PO BOX 5660, JOHNSTOWN, PA 15904-5660
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