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 100456, HOUSTON, TX 77212-0456
PO BOX 100457, HOUSTON, TX 77212-0457
PO BOX 100458, HOUSTON, TX 77212-0458
PO BOX 100459, HOUSTON, TX 77212-0459
PO BOX 100460, HOUSTON, TX 77212-0460
PO BOX 100461, HOUSTON, TX 77212-0461
PO BOX 100462, HOUSTON, TX 77212-0462
PO BOX 100463, HOUSTON, TX 77212-0463
PO BOX 100464, HOUSTON, TX 77212-0464
PO BOX 100465, HOUSTON, TX 77212-0465
PO BOX 100466, HOUSTON, TX 77212-0466
PO BOX 100467, HOUSTON, TX 77212-0467
PO BOX 100468, HOUSTON, TX 77212-0468
PO BOX 100469, HOUSTON, TX 77212-0469
PO BOX 100470, HOUSTON, TX 77212-0470
PO BOX 100471, HOUSTON, TX 77212-0471
PO BOX 100472, HOUSTON, TX 77212-0472
PO BOX 100473, HOUSTON, TX 77212-0473
PO BOX 100474, HOUSTON, TX 77212-0474
PO BOX 100475, HOUSTON, TX 77212-0475
PO BOX 100476, HOUSTON, TX 77212-0476
PO BOX 100477, HOUSTON, TX 77212-0477
PO BOX 100478, HOUSTON, TX 77212-0478
PO BOX 100479, HOUSTON, TX 77212-0479
PO BOX 100480, HOUSTON, TX 77212-0480
PO BOX 100481, HOUSTON, TX 77212-0481
PO BOX 100482, HOUSTON, TX 77212-0482
PO BOX 100483, HOUSTON, TX 77212-0483
PO BOX 100484, HOUSTON, TX 77212-0484
PO BOX 100485, HOUSTON, TX 77212-0485
PO BOX 100486, HOUSTON, TX 77212-0486
PO BOX 100487, HOUSTON, TX 77212-0487
PO BOX 100488, HOUSTON, TX 77212-0488
PO BOX 100489, HOUSTON, TX 77212-0489
PO BOX 100490, HOUSTON, TX 77212-0490
PO BOX 100491, HOUSTON, TX 77212-0491
PO BOX 100492, HOUSTON, TX 77212-0492
PO BOX 100493, HOUSTON, TX 77212-0493
PO BOX 100494, HOUSTON, TX 77212-0494
PO BOX 100495, HOUSTON, TX 77212-0495
PO BOX 100496, HOUSTON, TX 77212-0496
PO BOX 100497, HOUSTON, TX 77212-0497
PO BOX 100498, HOUSTON, TX 77212-0498
PO BOX 100499, HOUSTON, TX 77212-0499
PO BOX 100500, HOUSTON, TX 77212-0500
PO BOX 100501, HOUSTON, TX 77212-0501
PO BOX 100502, HOUSTON, TX 77212-0502
PO BOX 100503, HOUSTON, TX 77212-0503
PO BOX 100504, HOUSTON, TX 77212-0504
PO BOX 100505, HOUSTON, TX 77212-0505
PO BOX 100506, HOUSTON, TX 77212-0506
PO BOX 100507, HOUSTON, TX 77212-0507
PO BOX 100508, HOUSTON, TX 77212-0508
PO BOX 100509, HOUSTON, TX 77212-0509
PO BOX 100510, HOUSTON, TX 77212-0510
PO BOX 100511, HOUSTON, TX 77212-0511
PO BOX 100512, HOUSTON, TX 77212-0512
PO BOX 100513, HOUSTON, TX 77212-0513
PO BOX 100514, HOUSTON, TX 77212-0514
PO BOX 100515, HOUSTON, TX 77212-0515
PO BOX 100516, HOUSTON, TX 77212-0516
PO BOX 100517, HOUSTON, TX 77212-0517
PO BOX 100518, HOUSTON, TX 77212-0518
PO BOX 100519, HOUSTON, TX 77212-0519
PO BOX 100520, HOUSTON, TX 77212-0520
PO BOX 100521, HOUSTON, TX 77212-0521
PO BOX 100522, HOUSTON, TX 77212-0522
PO BOX 100523, HOUSTON, TX 77212-0523
PO BOX 100524, HOUSTON, TX 77212-0524
PO BOX 100525, HOUSTON, TX 77212-0525
PO BOX 100526, HOUSTON, TX 77212-0526
PO BOX 100527, HOUSTON, TX 77212-0527
PO BOX 100528, HOUSTON, TX 77212-0528
PO BOX 100529, HOUSTON, TX 77212-0529
PO BOX 100530, HOUSTON, TX 77212-0530
PO BOX 100531, HOUSTON, TX 77212-0531
PO BOX 100532, HOUSTON, TX 77212-0532
PO BOX 100533, HOUSTON, TX 77212-0533
PO BOX 100534, HOUSTON, TX 77212-0534
PO BOX 100535, HOUSTON, TX 77212-0535
PO BOX 100536, HOUSTON, TX 77212-0536
PO BOX 100537, HOUSTON, TX 77212-0537
PO BOX 100538, HOUSTON, TX 77212-0538
PO BOX 100539, HOUSTON, TX 77212-0539
PO BOX 100540, HOUSTON, TX 77212-0540
PO BOX 100541, HOUSTON, TX 77212-0541
PO BOX 100542, HOUSTON, TX 77212-0542
PO BOX 100543, HOUSTON, TX 77212-0543
PO BOX 100544, HOUSTON, TX 77212-0544
PO BOX 100545, HOUSTON, TX 77212-0545
PO BOX 100546, HOUSTON, TX 77212-0546
PO BOX 100547, HOUSTON, TX 77212-0547
PO BOX 100548, HOUSTON, TX 77212-0548
PO BOX 100549, HOUSTON, TX 77212-0549
PO BOX 100550, HOUSTON, TX 77212-0550
PO BOX 100551, HOUSTON, TX 77212-0551
PO BOX 100552, HOUSTON, TX 77212-0552
PO BOX 100553, HOUSTON, TX 77212-0553
PO BOX 100554, HOUSTON, TX 77212-0554
PO BOX 100555, HOUSTON, TX 77212-0555
PO BOX 100556, HOUSTON, TX 77212-0556
PO BOX 100557, HOUSTON, TX 77212-0557
PO BOX 100558, HOUSTON, TX 77212-0558
PO BOX 100559, HOUSTON, TX 77212-0559
PO BOX 100560, HOUSTON, TX 77212-0560
PO BOX 100561, HOUSTON, TX 77212-0561
PO BOX 100562, HOUSTON, TX 77212-0562
PO BOX 100563, HOUSTON, TX 77212-0563
PO BOX 100564, HOUSTON, TX 77212-0564
PO BOX 100565, HOUSTON, TX 77212-0565
PO BOX 100566, HOUSTON, TX 77212-0566
PO BOX 100567, HOUSTON, TX 77212-0567
PO BOX 100568, HOUSTON, TX 77212-0568
PO BOX 100569, HOUSTON, TX 77212-0569
PO BOX 100570, HOUSTON, TX 77212-0570
PO BOX 100571, HOUSTON, TX 77212-0571
PO BOX 100572, HOUSTON, TX 77212-0572
PO BOX 100573, HOUSTON, TX 77212-0573
PO BOX 100574, HOUSTON, TX 77212-0574
PO BOX 100575, HOUSTON, TX 77212-0575
PO BOX 100576, HOUSTON, TX 77212-0576
PO BOX 100577, HOUSTON, TX 77212-0577
PO BOX 100578, HOUSTON, TX 77212-0578
PO BOX 100579, HOUSTON, TX 77212-0579
PO BOX 100580, HOUSTON, TX 77212-0580
PO BOX 100581, HOUSTON, TX 77212-0581
PO BOX 100582, HOUSTON, TX 77212-0582
PO BOX 100583, HOUSTON, TX 77212-0583
PO BOX 100584, HOUSTON, TX 77212-0584
PO BOX 100585, HOUSTON, TX 77212-0585
PO BOX 100586, HOUSTON, TX 77212-0586
PO BOX 100587, HOUSTON, TX 77212-0587
PO BOX 100588, HOUSTON, TX 77212-0588
PO BOX 100589, HOUSTON, TX 77212-0589
PO BOX 100590, HOUSTON, TX 77212-0590
PO BOX 100591, HOUSTON, TX 77212-0591
PO BOX 100592, HOUSTON, TX 77212-0592
PO BOX 100593, HOUSTON, TX 77212-0593
PO BOX 100594, HOUSTON, TX 77212-0594
PO BOX 100595, HOUSTON, TX 77212-0595
PO BOX 100596, HOUSTON, TX 77212-0596
PO BOX 100597, HOUSTON, TX 77212-0597
PO BOX 100598, HOUSTON, TX 77212-0598
PO BOX 100599, HOUSTON, TX 77212-0599
PO BOX 100600, HOUSTON, TX 77212-0600
PO BOX 100601, HOUSTON, TX 77212-0601
PO BOX 100602, HOUSTON, TX 77212-0602
PO BOX 100603, HOUSTON, TX 77212-0603
PO BOX 100604, HOUSTON, TX 77212-0604
PO BOX 100605, HOUSTON, TX 77212-0605
PO BOX 100606, HOUSTON, TX 77212-0606
PO BOX 100607, HOUSTON, TX 77212-0607
PO BOX 100608, HOUSTON, TX 77212-0608
PO BOX 100609, HOUSTON, TX 77212-0609
PO BOX 100610, HOUSTON, TX 77212-0610
PO BOX 100611, HOUSTON, TX 77212-0611
PO BOX 100612, HOUSTON, TX 77212-0612
PO BOX 100613, HOUSTON, TX 77212-0613
PO BOX 100614, HOUSTON, TX 77212-0614
PO BOX 100615, HOUSTON, TX 77212-0615
PO BOX 100616, HOUSTON, TX 77212-0616
PO BOX 100617, HOUSTON, TX 77212-0617
PO BOX 100618, HOUSTON, TX 77212-0618
PO BOX 100619, HOUSTON, TX 77212-0619
PO BOX 100620, HOUSTON, TX 77212-0620
PO BOX 100621, HOUSTON, TX 77212-0621
PO BOX 100622, HOUSTON, TX 77212-0622
PO BOX 100623, HOUSTON, TX 77212-0623
PO BOX 100624, HOUSTON, TX 77212-0624
PO BOX 100625, HOUSTON, TX 77212-0625
PO BOX 100626, HOUSTON, TX 77212-0626
PO BOX 100627, HOUSTON, TX 77212-0627
PO BOX 100628, HOUSTON, TX 77212-0628
PO BOX 100629, HOUSTON, TX 77212-0629
PO BOX 100630, HOUSTON, TX 77212-0630
PO BOX 100631, HOUSTON, TX 77212-0631
PO BOX 100632, HOUSTON, TX 77212-0632
PO BOX 100633, HOUSTON, TX 77212-0633
PO BOX 100634, HOUSTON, TX 77212-0634
PO BOX 100635, HOUSTON, TX 77212-0635
PO BOX 100636, HOUSTON, TX 77212-0636
PO BOX 100637, HOUSTON, TX 77212-0637
PO BOX 100638, HOUSTON, TX 77212-0638
PO BOX 100639, HOUSTON, TX 77212-0639
PO BOX 100640, HOUSTON, TX 77212-0640
PO BOX 100641, HOUSTON, TX 77212-0641
PO BOX 100642, HOUSTON, TX 77212-0642
PO BOX 100643, HOUSTON, TX 77212-0643
PO BOX 100644, HOUSTON, TX 77212-0644
PO BOX 100645, HOUSTON, TX 77212-0645
PO BOX 100646, HOUSTON, TX 77212-0646
PO BOX 100647, HOUSTON, TX 77212-0647
PO BOX 100648, HOUSTON, TX 77212-0648
PO BOX 100649, HOUSTON, TX 77212-0649
PO BOX 100650, HOUSTON, TX 77212-0650
PO BOX 100651, HOUSTON, TX 77212-0651
PO BOX 100652, HOUSTON, TX 77212-0652
PO BOX 100653, HOUSTON, TX 77212-0653
PO BOX 100654, HOUSTON, TX 77212-0654
PO BOX 100655, HOUSTON, TX 77212-0655
PO BOX 100656, HOUSTON, TX 77212-0656
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