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 28321, SAN ANTONIO, TX 78228-0321
PO BOX 28322, SAN ANTONIO, TX 78228-0322
PO BOX 28323, SAN ANTONIO, TX 78228-0323
PO BOX 28324, SAN ANTONIO, TX 78228-0324
PO BOX 28325, SAN ANTONIO, TX 78228-0325
PO BOX 28326, SAN ANTONIO, TX 78228-0326
PO BOX 28327, SAN ANTONIO, TX 78228-0327
PO BOX 28328, SAN ANTONIO, TX 78228-0328
PO BOX 28329, SAN ANTONIO, TX 78228-0329
PO BOX 28330, SAN ANTONIO, TX 78228-0330
PO BOX 28331, SAN ANTONIO, TX 78228-0331
PO BOX 28332, SAN ANTONIO, TX 78228-0332
PO BOX 28333, SAN ANTONIO, TX 78228-0333
PO BOX 28334, SAN ANTONIO, TX 78228-0334
PO BOX 28335, SAN ANTONIO, TX 78228-0335
PO BOX 28336, SAN ANTONIO, TX 78228-0336
PO BOX 28337, SAN ANTONIO, TX 78228-0337
PO BOX 28338, SAN ANTONIO, TX 78228-0338
PO BOX 28339, SAN ANTONIO, TX 78228-0339
PO BOX 28340, SAN ANTONIO, TX 78228-0340
PO BOX 28341, SAN ANTONIO, TX 78228-0341
PO BOX 28342, SAN ANTONIO, TX 78228-0342
PO BOX 28343, SAN ANTONIO, TX 78228-0343
PO BOX 28344, SAN ANTONIO, TX 78228-0344
PO BOX 28345, SAN ANTONIO, TX 78228-0345
PO BOX 28346, SAN ANTONIO, TX 78228-0346
PO BOX 28347, SAN ANTONIO, TX 78228-0347
PO BOX 28348, SAN ANTONIO, TX 78228-0348
PO BOX 28349, SAN ANTONIO, TX 78228-0349
PO BOX 28350, SAN ANTONIO, TX 78228-0350
PO BOX 28351, SAN ANTONIO, TX 78228-0351
PO BOX 28352, SAN ANTONIO, TX 78228-0352
PO BOX 28353, SAN ANTONIO, TX 78228-0353
PO BOX 28354, SAN ANTONIO, TX 78228-0354
PO BOX 28355, SAN ANTONIO, TX 78228-0355
PO BOX 28356, SAN ANTONIO, TX 78228-0356
PO BOX 28357, SAN ANTONIO, TX 78228-0357
PO BOX 28358, SAN ANTONIO, TX 78228-0358
PO BOX 28359, SAN ANTONIO, TX 78228-0359
PO BOX 28360, SAN ANTONIO, TX 78228-0360
PO BOX 28361, SAN ANTONIO, TX 78228-0361
PO BOX 28362, SAN ANTONIO, TX 78228-0362
PO BOX 28363, SAN ANTONIO, TX 78228-0363
PO BOX 28364, SAN ANTONIO, TX 78228-0364
PO BOX 28365, SAN ANTONIO, TX 78228-0365
PO BOX 28366, SAN ANTONIO, TX 78228-0366
PO BOX 28367, SAN ANTONIO, TX 78228-0367
PO BOX 28368, SAN ANTONIO, TX 78228-0368
PO BOX 28369, SAN ANTONIO, TX 78228-0369
PO BOX 28370, SAN ANTONIO, TX 78228-0370
PO BOX 28371, SAN ANTONIO, TX 78228-0371
PO BOX 28372, SAN ANTONIO, TX 78228-0372
PO BOX 28373, SAN ANTONIO, TX 78228-0373
PO BOX 28374, SAN ANTONIO, TX 78228-0374
PO BOX 28375, SAN ANTONIO, TX 78228-0375
PO BOX 28376, SAN ANTONIO, TX 78228-0376
PO BOX 28377, SAN ANTONIO, TX 78228-0377
PO BOX 28378, SAN ANTONIO, TX 78228-0378
PO BOX 28379, SAN ANTONIO, TX 78228-0379
PO BOX 28380, SAN ANTONIO, TX 78228-0380
PO BOX 28381, SAN ANTONIO, TX 78228-0381
PO BOX 28382, SAN ANTONIO, TX 78228-0382
PO BOX 28383, SAN ANTONIO, TX 78228-0383
PO BOX 28384, SAN ANTONIO, TX 78228-0384
PO BOX 28385, SAN ANTONIO, TX 78228-0385
PO BOX 28386, SAN ANTONIO, TX 78228-0386
PO BOX 28387, SAN ANTONIO, TX 78228-0387
PO BOX 28388, SAN ANTONIO, TX 78228-0388
PO BOX 28389, SAN ANTONIO, TX 78228-0389
PO BOX 28390, SAN ANTONIO, TX 78228-0390
PO BOX 28391, SAN ANTONIO, TX 78228-0391
PO BOX 28392, SAN ANTONIO, TX 78228-0392
PO BOX 28393, SAN ANTONIO, TX 78228-0393
PO BOX 28394, SAN ANTONIO, TX 78228-0394
PO BOX 28395, SAN ANTONIO, TX 78228-0395
PO BOX 28396, SAN ANTONIO, TX 78228-0396
PO BOX 28397, SAN ANTONIO, TX 78228-0397
PO BOX 28398, SAN ANTONIO, TX 78228-0398
PO BOX 28399, SAN ANTONIO, TX 78228-0399
PO BOX 28400, SAN ANTONIO, TX 78228-0400
PO BOX 28401, SAN ANTONIO, TX 78228-0401
PO BOX 28402, SAN ANTONIO, TX 78228-0402
PO BOX 28403, SAN ANTONIO, TX 78228-0403
PO BOX 28404, SAN ANTONIO, TX 78228-0404
PO BOX 28405, SAN ANTONIO, TX 78228-0405
PO BOX 28406, SAN ANTONIO, TX 78228-0406
PO BOX 28407, SAN ANTONIO, TX 78228-0407
PO BOX 28408, SAN ANTONIO, TX 78228-0408
PO BOX 28409, SAN ANTONIO, TX 78228-0409
PO BOX 28410, SAN ANTONIO, TX 78228-0410
PO BOX 28411, SAN ANTONIO, TX 78228-0411
PO BOX 28412, SAN ANTONIO, TX 78228-0412
PO BOX 28413, SAN ANTONIO, TX 78228-0413
PO BOX 28414, SAN ANTONIO, TX 78228-0414
PO BOX 28415, SAN ANTONIO, TX 78228-0415
PO BOX 28416, SAN ANTONIO, TX 78228-0416
PO BOX 28417, SAN ANTONIO, TX 78228-0417
PO BOX 28418, SAN ANTONIO, TX 78228-0418
PO BOX 28419, SAN ANTONIO, TX 78228-0419
PO BOX 28420, SAN ANTONIO, TX 78228-0420
PO BOX 28421, SAN ANTONIO, TX 78228-0421
PO BOX 28422, SAN ANTONIO, TX 78228-0422
PO BOX 28423, SAN ANTONIO, TX 78228-0423
PO BOX 28424, SAN ANTONIO, TX 78228-0424
PO BOX 28425, SAN ANTONIO, TX 78228-0425
PO BOX 28426, SAN ANTONIO, TX 78228-0426
PO BOX 28427, SAN ANTONIO, TX 78228-0427
PO BOX 28428, SAN ANTONIO, TX 78228-0428
PO BOX 28429, SAN ANTONIO, TX 78228-0429
PO BOX 28430, SAN ANTONIO, TX 78228-0430
PO BOX 28431, SAN ANTONIO, TX 78228-0431
PO BOX 28432, SAN ANTONIO, TX 78228-0432
PO BOX 28433, SAN ANTONIO, TX 78228-0433
PO BOX 28434, SAN ANTONIO, TX 78228-0434
PO BOX 28435, SAN ANTONIO, TX 78228-0435
PO BOX 28436, SAN ANTONIO, TX 78228-0436
PO BOX 28437, SAN ANTONIO, TX 78228-0437
PO BOX 28438, SAN ANTONIO, TX 78228-0438
PO BOX 28439, SAN ANTONIO, TX 78228-0439
PO BOX 28440, SAN ANTONIO, TX 78228-0440
PO BOX 28441, SAN ANTONIO, TX 78228-0441
PO BOX 28442, SAN ANTONIO, TX 78228-0442
PO BOX 28443, SAN ANTONIO, TX 78228-0443
PO BOX 28444, SAN ANTONIO, TX 78228-0444
PO BOX 28445, SAN ANTONIO, TX 78228-0445
PO BOX 28446, SAN ANTONIO, TX 78228-0446
PO BOX 28447, SAN ANTONIO, TX 78228-0447
PO BOX 28448, SAN ANTONIO, TX 78228-0448
PO BOX 28449, SAN ANTONIO, TX 78228-0449
PO BOX 28450, SAN ANTONIO, TX 78228-0450
PO BOX 28451, SAN ANTONIO, TX 78228-0451
PO BOX 28452, SAN ANTONIO, TX 78228-0452
PO BOX 28453, SAN ANTONIO, TX 78228-0453
PO BOX 28454, SAN ANTONIO, TX 78228-0454
PO BOX 28455, SAN ANTONIO, TX 78228-0455
PO BOX 28456, SAN ANTONIO, TX 78228-0456
PO BOX 28457, SAN ANTONIO, TX 78228-0457
PO BOX 28458, SAN ANTONIO, TX 78228-0458
PO BOX 28459, SAN ANTONIO, TX 78228-0459
PO BOX 28460, SAN ANTONIO, TX 78228-0460
PO BOX 28461, SAN ANTONIO, TX 78228-0461
PO BOX 28462, SAN ANTONIO, TX 78228-0462
PO BOX 28463, SAN ANTONIO, TX 78228-0463
PO BOX 28464, SAN ANTONIO, TX 78228-0464
PO BOX 28465, SAN ANTONIO, TX 78228-0465
PO BOX 28466, SAN ANTONIO, TX 78228-0466
PO BOX 28467, SAN ANTONIO, TX 78228-0467
PO BOX 28468, SAN ANTONIO, TX 78228-0468
PO BOX 28469, SAN ANTONIO, TX 78228-0469
PO BOX 28470, SAN ANTONIO, TX 78228-0470
PO BOX 28471, SAN ANTONIO, TX 78228-0471
PO BOX 28472, SAN ANTONIO, TX 78228-0472
PO BOX 28473, SAN ANTONIO, TX 78228-0473
PO BOX 28474, SAN ANTONIO, TX 78228-0474
PO BOX 28475, SAN ANTONIO, TX 78228-0475
PO BOX 28476, SAN ANTONIO, TX 78228-0476
PO BOX 28477, SAN ANTONIO, TX 78228-0477
PO BOX 28478, SAN ANTONIO, TX 78228-0478
PO BOX 28479, SAN ANTONIO, TX 78228-0479
PO BOX 28480, SAN ANTONIO, TX 78228-0480
PO BOX 28481, SAN ANTONIO, TX 78228-0481
PO BOX 28482, SAN ANTONIO, TX 78228-0482
PO BOX 28483, SAN ANTONIO, TX 78228-0483
PO BOX 28484, SAN ANTONIO, TX 78228-0484
PO BOX 28485, SAN ANTONIO, TX 78228-0485
PO BOX 28486, SAN ANTONIO, TX 78228-0486
PO BOX 28487, SAN ANTONIO, TX 78228-0487
PO BOX 28488, SAN ANTONIO, TX 78228-0488
PO BOX 28489, SAN ANTONIO, TX 78228-0489
PO BOX 28490, SAN ANTONIO, TX 78228-0490
PO BOX 28491, SAN ANTONIO, TX 78228-0491
PO BOX 28492, SAN ANTONIO, TX 78228-0492
PO BOX 28493, SAN ANTONIO, TX 78228-0493
PO BOX 28494, SAN ANTONIO, TX 78228-0494
PO BOX 28495, SAN ANTONIO, TX 78228-0495
PO BOX 28496, SAN ANTONIO, TX 78228-0496
PO BOX 28497, SAN ANTONIO, TX 78228-0497
PO BOX 28498, SAN ANTONIO, TX 78228-0498
PO BOX 28499, SAN ANTONIO, TX 78228-0499
PO BOX 28500, SAN ANTONIO, TX 78228-0500
PO BOX 28501, SAN ANTONIO, TX 78228-0501
PO BOX 28502, SAN ANTONIO, TX 78228-0502
PO BOX 28503, SAN ANTONIO, TX 78228-0503
PO BOX 28504, SAN ANTONIO, TX 78228-0504
PO BOX 28505, SAN ANTONIO, TX 78228-0505
PO BOX 28506, SAN ANTONIO, TX 78228-0506
PO BOX 28507, SAN ANTONIO, TX 78228-0507
PO BOX 28508, SAN ANTONIO, TX 78228-0508
PO BOX 28509, SAN ANTONIO, TX 78228-0509
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