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 910241, SAN DIEGO, CA 92191-0241
PO BOX 910242, SAN DIEGO, CA 92191-0242
PO BOX 910243, SAN DIEGO, CA 92191-0243
PO BOX 910244, SAN DIEGO, CA 92191-0244
PO BOX 910245, SAN DIEGO, CA 92191-0245
PO BOX 910246, SAN DIEGO, CA 92191-0246
PO BOX 910247, SAN DIEGO, CA 92191-0247
PO BOX 910248, SAN DIEGO, CA 92191-0248
PO BOX 910249, SAN DIEGO, CA 92191-0249
PO BOX 910250, SAN DIEGO, CA 92191-0250
PO BOX 910251, SAN DIEGO, CA 92191-0251
PO BOX 910252, SAN DIEGO, CA 92191-0252
PO BOX 910253, SAN DIEGO, CA 92191-0253
PO BOX 910254, SAN DIEGO, CA 92191-0254
PO BOX 910255, SAN DIEGO, CA 92191-0255
PO BOX 910256, SAN DIEGO, CA 92191-0256
PO BOX 910257, SAN DIEGO, CA 92191-0257
PO BOX 910258, SAN DIEGO, CA 92191-0258
PO BOX 910259, SAN DIEGO, CA 92191-0259
PO BOX 910260, SAN DIEGO, CA 92191-0260
PO BOX 910261, SAN DIEGO, CA 92191-0261
PO BOX 910262, SAN DIEGO, CA 92191-0262
PO BOX 910263, SAN DIEGO, CA 92191-0263
PO BOX 910264, SAN DIEGO, CA 92191-0264
PO BOX 910265, SAN DIEGO, CA 92191-0265
PO BOX 910266, SAN DIEGO, CA 92191-0266
PO BOX 910267, SAN DIEGO, CA 92191-0267
PO BOX 910268, SAN DIEGO, CA 92191-0268
PO BOX 910269, SAN DIEGO, CA 92191-0269
PO BOX 910270, SAN DIEGO, CA 92191-0270
PO BOX 910271, SAN DIEGO, CA 92191-0271
PO BOX 910272, SAN DIEGO, CA 92191-0272
PO BOX 910273, SAN DIEGO, CA 92191-0273
PO BOX 910274, SAN DIEGO, CA 92191-0274
PO BOX 910275, SAN DIEGO, CA 92191-0275
PO BOX 910276, SAN DIEGO, CA 92191-0276
PO BOX 910277, SAN DIEGO, CA 92191-0277
PO BOX 910278, SAN DIEGO, CA 92191-0278
PO BOX 910279, SAN DIEGO, CA 92191-0279
PO BOX 910280, SAN DIEGO, CA 92191-0280
PO BOX 910281, SAN DIEGO, CA 92191-0281
PO BOX 910282, SAN DIEGO, CA 92191-0282
PO BOX 910283, SAN DIEGO, CA 92191-0283
PO BOX 910284, SAN DIEGO, CA 92191-0284
PO BOX 910285, SAN DIEGO, CA 92191-0285
PO BOX 910286, SAN DIEGO, CA 92191-0286
PO BOX 910287, SAN DIEGO, CA 92191-0287
PO BOX 910288, SAN DIEGO, CA 92191-0288
PO BOX 910289, SAN DIEGO, CA 92191-0289
PO BOX 910290, SAN DIEGO, CA 92191-0290
PO BOX 910291, SAN DIEGO, CA 92191-0291
PO BOX 910292, SAN DIEGO, CA 92191-0292
PO BOX 910293, SAN DIEGO, CA 92191-0293
PO BOX 910294, SAN DIEGO, CA 92191-0294
PO BOX 910295, SAN DIEGO, CA 92191-0295
PO BOX 910296, SAN DIEGO, CA 92191-0296
PO BOX 910297, SAN DIEGO, CA 92191-0297
PO BOX 910298, SAN DIEGO, CA 92191-0298
PO BOX 910299, SAN DIEGO, CA 92191-0299
PO BOX 910300, SAN DIEGO, CA 92191-0300
PO BOX 910301, SAN DIEGO, CA 92191-0301
PO BOX 910302, SAN DIEGO, CA 92191-0302
PO BOX 910303, SAN DIEGO, CA 92191-0303
PO BOX 910304, SAN DIEGO, CA 92191-0304
PO BOX 910305, SAN DIEGO, CA 92191-0305
PO BOX 910306, SAN DIEGO, CA 92191-0306
PO BOX 910307, SAN DIEGO, CA 92191-0307
PO BOX 910308, SAN DIEGO, CA 92191-0308
PO BOX 910309, SAN DIEGO, CA 92191-0309
PO BOX 910310, SAN DIEGO, CA 92191-0310
PO BOX 910311, SAN DIEGO, CA 92191-0311
PO BOX 910312, SAN DIEGO, CA 92191-0312
PO BOX 910313, SAN DIEGO, CA 92191-0313
PO BOX 910314, SAN DIEGO, CA 92191-0314
PO BOX 910315, SAN DIEGO, CA 92191-0315
PO BOX 910316, SAN DIEGO, CA 92191-0316
PO BOX 910317, SAN DIEGO, CA 92191-0317
PO BOX 910318, SAN DIEGO, CA 92191-0318
PO BOX 910319, SAN DIEGO, CA 92191-0319
PO BOX 910320, SAN DIEGO, CA 92191-0320
PO BOX 910321, SAN DIEGO, CA 92191-0321
PO BOX 910322, SAN DIEGO, CA 92191-0322
PO BOX 910323, SAN DIEGO, CA 92191-0323
PO BOX 910324, SAN DIEGO, CA 92191-0324
PO BOX 910325, SAN DIEGO, CA 92191-0325
PO BOX 910326, SAN DIEGO, CA 92191-0326
PO BOX 910327, SAN DIEGO, CA 92191-0327
PO BOX 910328, SAN DIEGO, CA 92191-0328
PO BOX 910329, SAN DIEGO, CA 92191-0329
PO BOX 910330, SAN DIEGO, CA 92191-0330
PO BOX 910331, SAN DIEGO, CA 92191-0331
PO BOX 910332, SAN DIEGO, CA 92191-0332
PO BOX 910333, SAN DIEGO, CA 92191-0333
PO BOX 910334, SAN DIEGO, CA 92191-0334
PO BOX 910335, SAN DIEGO, CA 92191-0335
PO BOX 910336, SAN DIEGO, CA 92191-0336
PO BOX 910337, SAN DIEGO, CA 92191-0337
PO BOX 910338, SAN DIEGO, CA 92191-0338
PO BOX 910339, SAN DIEGO, CA 92191-0339
PO BOX 910340, SAN DIEGO, CA 92191-0340
PO BOX 910341, SAN DIEGO, CA 92191-0341
PO BOX 910342, SAN DIEGO, CA 92191-0342
PO BOX 910343, SAN DIEGO, CA 92191-0343
PO BOX 910344, SAN DIEGO, CA 92191-0344
PO BOX 910345, SAN DIEGO, CA 92191-0345
PO BOX 910346, SAN DIEGO, CA 92191-0346
PO BOX 910347, SAN DIEGO, CA 92191-0347
PO BOX 910348, SAN DIEGO, CA 92191-0348
PO BOX 910349, SAN DIEGO, CA 92191-0349
PO BOX 910350, SAN DIEGO, CA 92191-0350
PO BOX 910351, SAN DIEGO, CA 92191-0351
PO BOX 910352, SAN DIEGO, CA 92191-0352
PO BOX 910353, SAN DIEGO, CA 92191-0353
PO BOX 910354, SAN DIEGO, CA 92191-0354
PO BOX 910355, SAN DIEGO, CA 92191-0355
PO BOX 910356, SAN DIEGO, CA 92191-0356
PO BOX 910357, SAN DIEGO, CA 92191-0357
PO BOX 910358, SAN DIEGO, CA 92191-0358
PO BOX 910359, SAN DIEGO, CA 92191-0359
PO BOX 910360, SAN DIEGO, CA 92191-0360
PO BOX 910361, SAN DIEGO, CA 92191-0361
PO BOX 910362, SAN DIEGO, CA 92191-0362
PO BOX 910363, SAN DIEGO, CA 92191-0363
PO BOX 910364, SAN DIEGO, CA 92191-0364
PO BOX 910365, SAN DIEGO, CA 92191-0365
PO BOX 910366, SAN DIEGO, CA 92191-0366
PO BOX 910367, SAN DIEGO, CA 92191-0367
PO BOX 910368, SAN DIEGO, CA 92191-0368
PO BOX 910369, SAN DIEGO, CA 92191-0369
PO BOX 910370, SAN DIEGO, CA 92191-0370
PO BOX 910371, SAN DIEGO, CA 92191-0371
PO BOX 910372, SAN DIEGO, CA 92191-0372
PO BOX 910373, SAN DIEGO, CA 92191-0373
PO BOX 910374, SAN DIEGO, CA 92191-0374
PO BOX 910375, SAN DIEGO, CA 92191-0375
PO BOX 910376, SAN DIEGO, CA 92191-0376
PO BOX 910377, SAN DIEGO, CA 92191-0377
PO BOX 910378, SAN DIEGO, CA 92191-0378
PO BOX 910379, SAN DIEGO, CA 92191-0379
PO BOX 910380, SAN DIEGO, CA 92191-0380
PO BOX 910381, SAN DIEGO, CA 92191-0381
PO BOX 910382, SAN DIEGO, CA 92191-0382
PO BOX 910383, SAN DIEGO, CA 92191-0383
PO BOX 910384, SAN DIEGO, CA 92191-0384
PO BOX 910385, SAN DIEGO, CA 92191-0385
PO BOX 910386, SAN DIEGO, CA 92191-0386
PO BOX 910387, SAN DIEGO, CA 92191-0387
PO BOX 910388, SAN DIEGO, CA 92191-0388
PO BOX 910389, SAN DIEGO, CA 92191-0389
PO BOX 910390, SAN DIEGO, CA 92191-0390
PO BOX 910391, SAN DIEGO, CA 92191-0391
PO BOX 910392, SAN DIEGO, CA 92191-0392
PO BOX 910393, SAN DIEGO, CA 92191-0393
PO BOX 910394, SAN DIEGO, CA 92191-0394
PO BOX 910395, SAN DIEGO, CA 92191-0395
PO BOX 910396, SAN DIEGO, CA 92191-0396
PO BOX 910397, SAN DIEGO, CA 92191-0397
PO BOX 910398, SAN DIEGO, CA 92191-0398
PO BOX 910399, SAN DIEGO, CA 92191-0399
PO BOX 910400, SAN DIEGO, CA 92191-0400
PO BOX 910401, SAN DIEGO, CA 92191-0401
PO BOX 910402, SAN DIEGO, CA 92191-0402
PO BOX 910403, SAN DIEGO, CA 92191-0403
PO BOX 910404, SAN DIEGO, CA 92191-0404
PO BOX 910405, SAN DIEGO, CA 92191-0405
PO BOX 910406, SAN DIEGO, CA 92191-0406
PO BOX 910407, SAN DIEGO, CA 92191-0407
PO BOX 910408, SAN DIEGO, CA 92191-0408
PO BOX 910409, SAN DIEGO, CA 92191-0409
PO BOX 910410, SAN DIEGO, CA 92191-0410
PO BOX 910411, SAN DIEGO, CA 92191-0411
PO BOX 910412, SAN DIEGO, CA 92191-0412
PO BOX 910413, SAN DIEGO, CA 92191-0413
PO BOX 910414, SAN DIEGO, CA 92191-0414
PO BOX 910415, SAN DIEGO, CA 92191-0415
PO BOX 910416, SAN DIEGO, CA 92191-0416
PO BOX 910417, SAN DIEGO, CA 92191-0417
PO BOX 910418, SAN DIEGO, CA 92191-0418
PO BOX 910419, SAN DIEGO, CA 92191-0419
PO BOX 910420, SAN DIEGO, CA 92191-0420
PO BOX 910421, SAN DIEGO, CA 92191-0421
PO BOX 910422, SAN DIEGO, CA 92191-0422
PO BOX 910423, SAN DIEGO, CA 92191-0423
PO BOX 910424, SAN DIEGO, CA 92191-0424
PO BOX 910425, SAN DIEGO, CA 92191-0425
PO BOX 910426, SAN DIEGO, CA 92191-0426
PO BOX 910427, SAN DIEGO, CA 92191-0427
PO BOX 910428, SAN DIEGO, CA 92191-0428
PO BOX 910429, SAN DIEGO, CA 92191-0429
PO BOX 910430, SAN DIEGO, CA 92191-0430
PO BOX 910431, SAN DIEGO, CA 92191-0431
PO BOX 910432, SAN DIEGO, CA 92191-0432
PO BOX 910433, SAN DIEGO, CA 92191-0433
PO BOX 910434, SAN DIEGO, CA 92191-0434
PO BOX 910435, SAN DIEGO, CA 92191-0435
PO BOX 910436, SAN DIEGO, CA 92191-0436
PO BOX 910437, SAN DIEGO, CA 92191-0437
PO BOX 910438, SAN DIEGO, CA 92191-0438
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