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 436320, SAN YSIDRO, CA 92143-6320
PO BOX 436321, SAN YSIDRO, CA 92143-6321
PO BOX 436322, SAN YSIDRO, CA 92143-6322
PO BOX 436323, SAN YSIDRO, CA 92143-6323
PO BOX 436324, SAN YSIDRO, CA 92143-6324
PO BOX 436325, SAN YSIDRO, CA 92143-6325
PO BOX 436326, SAN YSIDRO, CA 92143-6326
PO BOX 436327, SAN YSIDRO, CA 92143-6327
PO BOX 436328, SAN YSIDRO, CA 92143-6328
PO BOX 436329, SAN YSIDRO, CA 92143-6329
PO BOX 436330, SAN YSIDRO, CA 92143-6330
PO BOX 436331, SAN YSIDRO, CA 92143-6331
PO BOX 436332, SAN YSIDRO, CA 92143-6332
PO BOX 436333, SAN YSIDRO, CA 92143-6333
PO BOX 436334, SAN YSIDRO, CA 92143-6334
PO BOX 436335, SAN YSIDRO, CA 92143-6335
PO BOX 436336, SAN YSIDRO, CA 92143-6336
PO BOX 436337, SAN YSIDRO, CA 92143-6337
PO BOX 436338, SAN YSIDRO, CA 92143-6338
PO BOX 436339, SAN YSIDRO, CA 92143-6339
PO BOX 436340, SAN YSIDRO, CA 92143-6340
PO BOX 436341, SAN YSIDRO, CA 92143-6341
PO BOX 436342, SAN YSIDRO, CA 92143-6342
PO BOX 436343, SAN YSIDRO, CA 92143-6343
PO BOX 436344, SAN YSIDRO, CA 92143-6344
PO BOX 436345, SAN YSIDRO, CA 92143-6345
PO BOX 436346, SAN YSIDRO, CA 92143-6346
PO BOX 436347, SAN YSIDRO, CA 92143-6347
PO BOX 436348, SAN YSIDRO, CA 92143-6348
PO BOX 436349, SAN YSIDRO, CA 92143-6349
PO BOX 436350, SAN YSIDRO, CA 92143-6350
PO BOX 436351, SAN YSIDRO, CA 92143-6351
PO BOX 436352, SAN YSIDRO, CA 92143-6352
PO BOX 436353, SAN YSIDRO, CA 92143-6353
PO BOX 436354, SAN YSIDRO, CA 92143-6354
PO BOX 436355, SAN YSIDRO, CA 92143-6355
PO BOX 436356, SAN YSIDRO, CA 92143-6356
PO BOX 436357, SAN YSIDRO, CA 92143-6357
PO BOX 436358, SAN YSIDRO, CA 92143-6358
PO BOX 436359, SAN YSIDRO, CA 92143-6359
PO BOX 436360, SAN YSIDRO, CA 92143-6360
PO BOX 436361, SAN YSIDRO, CA 92143-6361
PO BOX 436362, SAN YSIDRO, CA 92143-6362
PO BOX 436363, SAN YSIDRO, CA 92143-6363
PO BOX 436364, SAN YSIDRO, CA 92143-6364
PO BOX 436365, SAN YSIDRO, CA 92143-6365
PO BOX 436366, SAN YSIDRO, CA 92143-6366
PO BOX 436367, SAN YSIDRO, CA 92143-6367
PO BOX 436368, SAN YSIDRO, CA 92143-6368
PO BOX 436369, SAN YSIDRO, CA 92143-6369
PO BOX 436370, SAN YSIDRO, CA 92143-6370
PO BOX 436371, SAN YSIDRO, CA 92143-6371
PO BOX 436372, SAN YSIDRO, CA 92143-6372
PO BOX 436373, SAN YSIDRO, CA 92143-6373
PO BOX 436374, SAN YSIDRO, CA 92143-6374
PO BOX 436375, SAN YSIDRO, CA 92143-6375
PO BOX 436376, SAN YSIDRO, CA 92143-6376
PO BOX 436377, SAN YSIDRO, CA 92143-6377
PO BOX 436378, SAN YSIDRO, CA 92143-6378
PO BOX 436379, SAN YSIDRO, CA 92143-6379
PO BOX 436380, SAN YSIDRO, CA 92143-6380
PO BOX 436381, SAN YSIDRO, CA 92143-6381
PO BOX 436382, SAN YSIDRO, CA 92143-6382
PO BOX 436383, SAN YSIDRO, CA 92143-6383
PO BOX 436384, SAN YSIDRO, CA 92143-6384
PO BOX 436385, SAN YSIDRO, CA 92143-6385
PO BOX 436386, SAN YSIDRO, CA 92143-6386
PO BOX 436387, SAN YSIDRO, CA 92143-6387
PO BOX 436388, SAN YSIDRO, CA 92143-6388
PO BOX 436389, SAN YSIDRO, CA 92143-6389
PO BOX 436390, SAN YSIDRO, CA 92143-6390
PO BOX 436391, SAN YSIDRO, CA 92143-6391
PO BOX 436392, SAN YSIDRO, CA 92143-6392
PO BOX 436393, SAN YSIDRO, CA 92143-6393
PO BOX 436394, SAN YSIDRO, CA 92143-6394
PO BOX 436395, SAN YSIDRO, CA 92143-6395
PO BOX 436396, SAN YSIDRO, CA 92143-6396
PO BOX 436397, SAN YSIDRO, CA 92143-6397
PO BOX 436398, SAN YSIDRO, CA 92143-6398
PO BOX 436399, SAN YSIDRO, CA 92143-6399
PO BOX 436400, SAN YSIDRO, CA 92143-6400
PO BOX 436401, SAN YSIDRO, CA 92143-6401
PO BOX 436402, SAN YSIDRO, CA 92143-6402
PO BOX 436403, SAN YSIDRO, CA 92143-6403
PO BOX 436404, SAN YSIDRO, CA 92143-6404
PO BOX 436405, SAN YSIDRO, CA 92143-6405
PO BOX 436406, SAN YSIDRO, CA 92143-6406
PO BOX 436407, SAN YSIDRO, CA 92143-6407
PO BOX 436408, SAN YSIDRO, CA 92143-6408
PO BOX 436409, SAN YSIDRO, CA 92143-6409
PO BOX 436410, SAN YSIDRO, CA 92143-6410
PO BOX 436411, SAN YSIDRO, CA 92143-6411
PO BOX 436412, SAN YSIDRO, CA 92143-6412
PO BOX 436413, SAN YSIDRO, CA 92143-6413
PO BOX 436414, SAN YSIDRO, CA 92143-6414
PO BOX 436415, SAN YSIDRO, CA 92143-6415
PO BOX 436416, SAN YSIDRO, CA 92143-6416
PO BOX 436417, SAN YSIDRO, CA 92143-6417
PO BOX 436418, SAN YSIDRO, CA 92143-6418
PO BOX 436419, SAN YSIDRO, CA 92143-6419
PO BOX 436420, SAN YSIDRO, CA 92143-6420
PO BOX 436421, SAN YSIDRO, CA 92143-6421
PO BOX 436422, SAN YSIDRO, CA 92143-6422
PO BOX 436423, SAN YSIDRO, CA 92143-6423
PO BOX 436424, SAN YSIDRO, CA 92143-6424
PO BOX 436425, SAN YSIDRO, CA 92143-6425
PO BOX 436426, SAN YSIDRO, CA 92143-6426
PO BOX 436427, SAN YSIDRO, CA 92143-6427
PO BOX 436428, SAN YSIDRO, CA 92143-6428
PO BOX 436429, SAN YSIDRO, CA 92143-6429
PO BOX 436430, SAN YSIDRO, CA 92143-6430
PO BOX 436431, SAN YSIDRO, CA 92143-6431
PO BOX 436432, SAN YSIDRO, CA 92143-6432
PO BOX 436433, SAN YSIDRO, CA 92143-6433
PO BOX 436434, SAN YSIDRO, CA 92143-6434
PO BOX 436435, SAN YSIDRO, CA 92143-6435
PO BOX 436436, SAN YSIDRO, CA 92143-6436
PO BOX 436437, SAN YSIDRO, CA 92143-6437
PO BOX 436438, SAN YSIDRO, CA 92143-6438
PO BOX 436439, SAN YSIDRO, CA 92143-6439
PO BOX 436440, SAN YSIDRO, CA 92143-6440
PO BOX 436441, SAN YSIDRO, CA 92143-6441
PO BOX 436442, SAN YSIDRO, CA 92143-6442
PO BOX 436443, SAN YSIDRO, CA 92143-6443
PO BOX 436444, SAN YSIDRO, CA 92143-6444
PO BOX 436445, SAN YSIDRO, CA 92143-6445
PO BOX 436446, SAN YSIDRO, CA 92143-6446
PO BOX 436447, SAN YSIDRO, CA 92143-6447
PO BOX 436448, SAN YSIDRO, CA 92143-6448
PO BOX 436449, SAN YSIDRO, CA 92143-6449
PO BOX 436450, SAN YSIDRO, CA 92143-6450
PO BOX 436451, SAN YSIDRO, CA 92143-6451
PO BOX 436452, SAN YSIDRO, CA 92143-6452
PO BOX 436453, SAN YSIDRO, CA 92143-6453
PO BOX 436454, SAN YSIDRO, CA 92143-6454
PO BOX 436455, SAN YSIDRO, CA 92143-6455
PO BOX 436456, SAN YSIDRO, CA 92143-6456
PO BOX 436457, SAN YSIDRO, CA 92143-6457
PO BOX 436458, SAN YSIDRO, CA 92143-6458
PO BOX 436459, SAN YSIDRO, CA 92143-6459
PO BOX 436460, SAN YSIDRO, CA 92143-6460
PO BOX 436461, SAN YSIDRO, CA 92143-6461
PO BOX 436462, SAN YSIDRO, CA 92143-6462
PO BOX 436463, SAN YSIDRO, CA 92143-6463
PO BOX 436464, SAN YSIDRO, CA 92143-6464
PO BOX 436465, SAN YSIDRO, CA 92143-6465
PO BOX 436466, SAN YSIDRO, CA 92143-6466
PO BOX 436467, SAN YSIDRO, CA 92143-6467
PO BOX 436468, SAN YSIDRO, CA 92143-6468
PO BOX 436469, SAN YSIDRO, CA 92143-6469
PO BOX 436470, SAN YSIDRO, CA 92143-6470
PO BOX 436471, SAN YSIDRO, CA 92143-6471
PO BOX 436472, SAN YSIDRO, CA 92143-6472
PO BOX 436473, SAN YSIDRO, CA 92143-6473
PO BOX 436474, SAN YSIDRO, CA 92143-6474
PO BOX 436475, SAN YSIDRO, CA 92143-6475
PO BOX 436476, SAN YSIDRO, CA 92143-6476
PO BOX 436477, SAN YSIDRO, CA 92143-6477
PO BOX 436478, SAN YSIDRO, CA 92143-6478
PO BOX 436479, SAN YSIDRO, CA 92143-6479
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