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 680421, SAN ANTONIO, TX 78268-0421
PO BOX 680422, SAN ANTONIO, TX 78268-0422
PO BOX 680423, SAN ANTONIO, TX 78268-0423
PO BOX 680424, SAN ANTONIO, TX 78268-0424
PO BOX 680425, SAN ANTONIO, TX 78268-0425
PO BOX 680426, SAN ANTONIO, TX 78268-0426
PO BOX 680427, SAN ANTONIO, TX 78268-0427
PO BOX 680428, SAN ANTONIO, TX 78268-0428
PO BOX 680429, SAN ANTONIO, TX 78268-0429
PO BOX 680430, SAN ANTONIO, TX 78268-0430
PO BOX 680431, SAN ANTONIO, TX 78268-0431
PO BOX 680432, SAN ANTONIO, TX 78268-0432
PO BOX 680433, SAN ANTONIO, TX 78268-0433
PO BOX 680434, SAN ANTONIO, TX 78268-0434
PO BOX 680435, SAN ANTONIO, TX 78268-0435
PO BOX 680436, SAN ANTONIO, TX 78268-0436
PO BOX 680437, SAN ANTONIO, TX 78268-0437
PO BOX 680438, SAN ANTONIO, TX 78268-0438
PO BOX 680439, SAN ANTONIO, TX 78268-0439
PO BOX 680440, SAN ANTONIO, TX 78268-0440
PO BOX 680441, SAN ANTONIO, TX 78268-0441
PO BOX 680442, SAN ANTONIO, TX 78268-0442
PO BOX 680443, SAN ANTONIO, TX 78268-0443
PO BOX 680444, SAN ANTONIO, TX 78268-0444
PO BOX 680445, SAN ANTONIO, TX 78268-0445
PO BOX 680446, SAN ANTONIO, TX 78268-0446
PO BOX 680447, SAN ANTONIO, TX 78268-0447
PO BOX 680448, SAN ANTONIO, TX 78268-0448
PO BOX 680449, SAN ANTONIO, TX 78268-0449
PO BOX 680450, SAN ANTONIO, TX 78268-0450
PO BOX 680451, SAN ANTONIO, TX 78268-0451
PO BOX 680452, SAN ANTONIO, TX 78268-0452
PO BOX 680453, SAN ANTONIO, TX 78268-0453
PO BOX 680454, SAN ANTONIO, TX 78268-0454
PO BOX 680455, SAN ANTONIO, TX 78268-0455
PO BOX 680456, SAN ANTONIO, TX 78268-0456
PO BOX 680457, SAN ANTONIO, TX 78268-0457
PO BOX 680458, SAN ANTONIO, TX 78268-0458
PO BOX 680459, SAN ANTONIO, TX 78268-0459
PO BOX 680460, SAN ANTONIO, TX 78268-0460
PO BOX 680461, SAN ANTONIO, TX 78268-0461
PO BOX 680462, SAN ANTONIO, TX 78268-0462
PO BOX 680463, SAN ANTONIO, TX 78268-0463
PO BOX 680464, SAN ANTONIO, TX 78268-0464
PO BOX 680465, SAN ANTONIO, TX 78268-0465
PO BOX 680466, SAN ANTONIO, TX 78268-0466
PO BOX 680467, SAN ANTONIO, TX 78268-0467
PO BOX 680468, SAN ANTONIO, TX 78268-0468
PO BOX 680469, SAN ANTONIO, TX 78268-0469
PO BOX 680470, SAN ANTONIO, TX 78268-0470
PO BOX 680471, SAN ANTONIO, TX 78268-0471
PO BOX 680472, SAN ANTONIO, TX 78268-0472
PO BOX 680473, SAN ANTONIO, TX 78268-0473
PO BOX 680474, SAN ANTONIO, TX 78268-0474
PO BOX 680475, SAN ANTONIO, TX 78268-0475
PO BOX 680476, SAN ANTONIO, TX 78268-0476
PO BOX 680477, SAN ANTONIO, TX 78268-0477
PO BOX 680478, SAN ANTONIO, TX 78268-0478
PO BOX 680479, SAN ANTONIO, TX 78268-0479
PO BOX 680480, SAN ANTONIO, TX 78268-0480
PO BOX 680481, SAN ANTONIO, TX 78268-0481
PO BOX 680482, SAN ANTONIO, TX 78268-0482
PO BOX 680483, SAN ANTONIO, TX 78268-0483
PO BOX 680484, SAN ANTONIO, TX 78268-0484
PO BOX 680485, SAN ANTONIO, TX 78268-0485
PO BOX 680486, SAN ANTONIO, TX 78268-0486
PO BOX 680487, SAN ANTONIO, TX 78268-0487
PO BOX 680488, SAN ANTONIO, TX 78268-0488
PO BOX 680489, SAN ANTONIO, TX 78268-0489
PO BOX 680490, SAN ANTONIO, TX 78268-0490
PO BOX 680491, SAN ANTONIO, TX 78268-0491
PO BOX 680492, SAN ANTONIO, TX 78268-0492
PO BOX 680493, SAN ANTONIO, TX 78268-0493
PO BOX 680494, SAN ANTONIO, TX 78268-0494
PO BOX 680495, SAN ANTONIO, TX 78268-0495
PO BOX 680496, SAN ANTONIO, TX 78268-0496
PO BOX 680497, SAN ANTONIO, TX 78268-0497
PO BOX 680498, SAN ANTONIO, TX 78268-0498
PO BOX 680499, SAN ANTONIO, TX 78268-0499
PO BOX 680500, SAN ANTONIO, TX 78268-0500
PO BOX 680501, SAN ANTONIO, TX 78268-0501
PO BOX 680502, SAN ANTONIO, TX 78268-0502
PO BOX 680503, SAN ANTONIO, TX 78268-0503
PO BOX 680504, SAN ANTONIO, TX 78268-0504
PO BOX 680505, SAN ANTONIO, TX 78268-0505
PO BOX 680506, SAN ANTONIO, TX 78268-0506
PO BOX 680507, SAN ANTONIO, TX 78268-0507
PO BOX 680508, SAN ANTONIO, TX 78268-0508
PO BOX 680509, SAN ANTONIO, TX 78268-0509
PO BOX 680510, SAN ANTONIO, TX 78268-0510
PO BOX 680511, SAN ANTONIO, TX 78268-0511
PO BOX 680512, SAN ANTONIO, TX 78268-0512
PO BOX 680513, SAN ANTONIO, TX 78268-0513
PO BOX 680514, SAN ANTONIO, TX 78268-0514
PO BOX 680515, SAN ANTONIO, TX 78268-0515
PO BOX 680516, SAN ANTONIO, TX 78268-0516
PO BOX 680517, SAN ANTONIO, TX 78268-0517
PO BOX 680518, SAN ANTONIO, TX 78268-0518
PO BOX 680519, SAN ANTONIO, TX 78268-0519
PO BOX 680520, SAN ANTONIO, TX 78268-0520
PO BOX 680521, SAN ANTONIO, TX 78268-0521
PO BOX 680522, SAN ANTONIO, TX 78268-0522
PO BOX 680523, SAN ANTONIO, TX 78268-0523
PO BOX 680524, SAN ANTONIO, TX 78268-0524
PO BOX 680525, SAN ANTONIO, TX 78268-0525
PO BOX 680526, SAN ANTONIO, TX 78268-0526
PO BOX 680527, SAN ANTONIO, TX 78268-0527
PO BOX 680528, SAN ANTONIO, TX 78268-0528
PO BOX 680529, SAN ANTONIO, TX 78268-0529
PO BOX 680530, SAN ANTONIO, TX 78268-0530
PO BOX 680531, SAN ANTONIO, TX 78268-0531
PO BOX 680532, SAN ANTONIO, TX 78268-0532
PO BOX 680533, SAN ANTONIO, TX 78268-0533
PO BOX 680534, SAN ANTONIO, TX 78268-0534
PO BOX 680535, SAN ANTONIO, TX 78268-0535
PO BOX 680536, SAN ANTONIO, TX 78268-0536
PO BOX 680537, SAN ANTONIO, TX 78268-0537
PO BOX 680538, SAN ANTONIO, TX 78268-0538
PO BOX 680539, SAN ANTONIO, TX 78268-0539
PO BOX 680540, SAN ANTONIO, TX 78268-0540
PO BOX 680541, SAN ANTONIO, TX 78268-0541
PO BOX 680542, SAN ANTONIO, TX 78268-0542
PO BOX 680543, SAN ANTONIO, TX 78268-0543
PO BOX 680544, SAN ANTONIO, TX 78268-0544
PO BOX 680545, SAN ANTONIO, TX 78268-0545
PO BOX 680546, SAN ANTONIO, TX 78268-0546
PO BOX 680547, SAN ANTONIO, TX 78268-0547
PO BOX 680548, SAN ANTONIO, TX 78268-0548
PO BOX 680549, SAN ANTONIO, TX 78268-0549
PO BOX 680550, SAN ANTONIO, TX 78268-0550
PO BOX 680551, SAN ANTONIO, TX 78268-0551
PO BOX 680552, SAN ANTONIO, TX 78268-0552
PO BOX 680553, SAN ANTONIO, TX 78268-0553
PO BOX 680554, SAN ANTONIO, TX 78268-0554
PO BOX 680555, SAN ANTONIO, TX 78268-0555
PO BOX 680556, SAN ANTONIO, TX 78268-0556
PO BOX 680557, SAN ANTONIO, TX 78268-0557
PO BOX 680558, SAN ANTONIO, TX 78268-0558
PO BOX 680559, SAN ANTONIO, TX 78268-0559
PO BOX 680560, SAN ANTONIO, TX 78268-0560
PO BOX 680561, SAN ANTONIO, TX 78268-0561
PO BOX 680562, SAN ANTONIO, TX 78268-0562
PO BOX 680563, SAN ANTONIO, TX 78268-0563
PO BOX 680564, SAN ANTONIO, TX 78268-0564
PO BOX 680565, SAN ANTONIO, TX 78268-0565
PO BOX 680566, SAN ANTONIO, TX 78268-0566
PO BOX 680567, SAN ANTONIO, TX 78268-0567
PO BOX 680568, SAN ANTONIO, TX 78268-0568
PO BOX 680569, SAN ANTONIO, TX 78268-0569
PO BOX 680570, SAN ANTONIO, TX 78268-0570
PO BOX 680571, SAN ANTONIO, TX 78268-0571
PO BOX 680572, SAN ANTONIO, TX 78268-0572
PO BOX 680573, SAN ANTONIO, TX 78268-0573
PO BOX 680574, SAN ANTONIO, TX 78268-0574
PO BOX 680575, SAN ANTONIO, TX 78268-0575
PO BOX 680576, SAN ANTONIO, TX 78268-0576
PO BOX 680577, SAN ANTONIO, TX 78268-0577
PO BOX 680578, SAN ANTONIO, TX 78268-0578
PO BOX 680579, SAN ANTONIO, TX 78268-0579
PO BOX 680580, SAN ANTONIO, TX 78268-0580
PO BOX 680581, SAN ANTONIO, TX 78268-0581
PO BOX 680582, SAN ANTONIO, TX 78268-0582
PO BOX 680583, SAN ANTONIO, TX 78268-0583
PO BOX 680584, SAN ANTONIO, TX 78268-0584
PO BOX 680585, SAN ANTONIO, TX 78268-0585
PO BOX 680586, SAN ANTONIO, TX 78268-0586
PO BOX 680587, SAN ANTONIO, TX 78268-0587
PO BOX 680588, SAN ANTONIO, TX 78268-0588
PO BOX 680589, SAN ANTONIO, TX 78268-0589
PO BOX 680590, SAN ANTONIO, TX 78268-0590
PO BOX 680591, SAN ANTONIO, TX 78268-0591
PO BOX 680592, SAN ANTONIO, TX 78268-0592
PO BOX 680593, SAN ANTONIO, TX 78268-0593
PO BOX 680594, SAN ANTONIO, TX 78268-0594
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