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 28181, SAN DIEGO, CA 92198-0181
PO BOX 28182, SAN DIEGO, CA 92198-0182
PO BOX 28183, SAN DIEGO, CA 92198-0183
PO BOX 28184, SAN DIEGO, CA 92198-0184
PO BOX 28185, SAN DIEGO, CA 92198-0185
PO BOX 28186, SAN DIEGO, CA 92198-0186
PO BOX 28187, SAN DIEGO, CA 92198-0187
PO BOX 28188, SAN DIEGO, CA 92198-0188
PO BOX 28189, SAN DIEGO, CA 92198-0189
PO BOX 28190, SAN DIEGO, CA 92198-0190
PO BOX 28191, SAN DIEGO, CA 92198-0191
PO BOX 28192, SAN DIEGO, CA 92198-0192
PO BOX 28193, SAN DIEGO, CA 92198-0193
PO BOX 28194, SAN DIEGO, CA 92198-0194
PO BOX 28195, SAN DIEGO, CA 92198-0195
PO BOX 28196, SAN DIEGO, CA 92198-0196
PO BOX 28197, SAN DIEGO, CA 92198-0197
PO BOX 28198, SAN DIEGO, CA 92198-0198
PO BOX 28199, SAN DIEGO, CA 92198-0199
PO BOX 28200, SAN DIEGO, CA 92198-0200
PO BOX 28201, SAN DIEGO, CA 92198-0201
PO BOX 28202, SAN DIEGO, CA 92198-0202
PO BOX 28203, SAN DIEGO, CA 92198-0203
PO BOX 28204, SAN DIEGO, CA 92198-0204
PO BOX 28205, SAN DIEGO, CA 92198-0205
PO BOX 28206, SAN DIEGO, CA 92198-0206
PO BOX 28207, SAN DIEGO, CA 92198-0207
PO BOX 28208, SAN DIEGO, CA 92198-0208
PO BOX 28209, SAN DIEGO, CA 92198-0209
PO BOX 28210, SAN DIEGO, CA 92198-0210
PO BOX 28211, SAN DIEGO, CA 92198-0211
PO BOX 28212, SAN DIEGO, CA 92198-0212
PO BOX 28213, SAN DIEGO, CA 92198-0213
PO BOX 28214, SAN DIEGO, CA 92198-0214
PO BOX 28215, SAN DIEGO, CA 92198-0215
PO BOX 28216, SAN DIEGO, CA 92198-0216
PO BOX 28217, SAN DIEGO, CA 92198-0217
PO BOX 28218, SAN DIEGO, CA 92198-0218
PO BOX 28219, SAN DIEGO, CA 92198-0219
PO BOX 28220, SAN DIEGO, CA 92198-0220
PO BOX 28221, SAN DIEGO, CA 92198-0221
PO BOX 28222, SAN DIEGO, CA 92198-0222
PO BOX 28223, SAN DIEGO, CA 92198-0223
PO BOX 28224, SAN DIEGO, CA 92198-0224
PO BOX 28225, SAN DIEGO, CA 92198-0225
PO BOX 28226, SAN DIEGO, CA 92198-0226
PO BOX 28227, SAN DIEGO, CA 92198-0227
PO BOX 28228, SAN DIEGO, CA 92198-0228
PO BOX 28229, SAN DIEGO, CA 92198-0229
PO BOX 28230, SAN DIEGO, CA 92198-0230
PO BOX 28231, SAN DIEGO, CA 92198-0231
PO BOX 28232, SAN DIEGO, CA 92198-0232
PO BOX 28233, SAN DIEGO, CA 92198-0233
PO BOX 28234, SAN DIEGO, CA 92198-0234
PO BOX 28235, SAN DIEGO, CA 92198-0235
PO BOX 28236, SAN DIEGO, CA 92198-0236
PO BOX 28237, SAN DIEGO, CA 92198-0237
PO BOX 28238, SAN DIEGO, CA 92198-0238
PO BOX 28239, SAN DIEGO, CA 92198-0239
PO BOX 28240, SAN DIEGO, CA 92198-0240
PO BOX 28241, SAN DIEGO, CA 92198-0241
PO BOX 28242, SAN DIEGO, CA 92198-0242
PO BOX 28243, SAN DIEGO, CA 92198-0243
PO BOX 28244, SAN DIEGO, CA 92198-0244
PO BOX 28245, SAN DIEGO, CA 92198-0245
PO BOX 28246, SAN DIEGO, CA 92198-0246
PO BOX 28247, SAN DIEGO, CA 92198-0247
PO BOX 28248, SAN DIEGO, CA 92198-0248
PO BOX 28249, SAN DIEGO, CA 92198-0249
PO BOX 28250, SAN DIEGO, CA 92198-0250
PO BOX 28251, SAN DIEGO, CA 92198-0251
PO BOX 28252, SAN DIEGO, CA 92198-0252
PO BOX 28253, SAN DIEGO, CA 92198-0253
PO BOX 28254, SAN DIEGO, CA 92198-0254
PO BOX 28255, SAN DIEGO, CA 92198-0255
PO BOX 28256, SAN DIEGO, CA 92198-0256
PO BOX 28257, SAN DIEGO, CA 92198-0257
PO BOX 28258, SAN DIEGO, CA 92198-0258
PO BOX 28259, SAN DIEGO, CA 92198-0259
PO BOX 28260, SAN DIEGO, CA 92198-0260
PO BOX 28261, SAN DIEGO, CA 92198-0261
PO BOX 28262, SAN DIEGO, CA 92198-0262
PO BOX 28263, SAN DIEGO, CA 92198-0263
PO BOX 28264, SAN DIEGO, CA 92198-0264
PO BOX 28265, SAN DIEGO, CA 92198-0265
PO BOX 28266, SAN DIEGO, CA 92198-0266
PO BOX 28267, SAN DIEGO, CA 92198-0267
PO BOX 28268, SAN DIEGO, CA 92198-0268
PO BOX 28269, SAN DIEGO, CA 92198-0269
PO BOX 28270, SAN DIEGO, CA 92198-0270
PO BOX 28271, SAN DIEGO, CA 92198-0271
PO BOX 28272, SAN DIEGO, CA 92198-0272
PO BOX 28273, SAN DIEGO, CA 92198-0273
PO BOX 28274, SAN DIEGO, CA 92198-0274
PO BOX 28275, SAN DIEGO, CA 92198-0275
PO BOX 28276, SAN DIEGO, CA 92198-0276
PO BOX 28277, SAN DIEGO, CA 92198-0277
PO BOX 28278, SAN DIEGO, CA 92198-0278
PO BOX 28279, SAN DIEGO, CA 92198-0279
PO BOX 28280, SAN DIEGO, CA 92198-0280
PO BOX 28281, SAN DIEGO, CA 92198-0281
PO BOX 28282, SAN DIEGO, CA 92198-0282
PO BOX 28283, SAN DIEGO, CA 92198-0283
PO BOX 28284, SAN DIEGO, CA 92198-0284
PO BOX 28285, SAN DIEGO, CA 92198-0285
PO BOX 28286, SAN DIEGO, CA 92198-0286
PO BOX 28287, SAN DIEGO, CA 92198-0287
PO BOX 28288, SAN DIEGO, CA 92198-0288
PO BOX 28289, SAN DIEGO, CA 92198-0289
PO BOX 28290, SAN DIEGO, CA 92198-0290
PO BOX 28291, SAN DIEGO, CA 92198-0291
PO BOX 28292, SAN DIEGO, CA 92198-0292
PO BOX 28293, SAN DIEGO, CA 92198-0293
PO BOX 28294, SAN DIEGO, CA 92198-0294
PO BOX 28295, SAN DIEGO, CA 92198-0295
PO BOX 28296, SAN DIEGO, CA 92198-0296
PO BOX 28297, SAN DIEGO, CA 92198-0297
PO BOX 28298, SAN DIEGO, CA 92198-0298
PO BOX 28299, SAN DIEGO, CA 92198-0299
PO BOX 28300, SAN DIEGO, CA 92198-0300
PO BOX 28301, SAN DIEGO, CA 92198-0301
PO BOX 28302, SAN DIEGO, CA 92198-0302
PO BOX 28303, SAN DIEGO, CA 92198-0303
PO BOX 28304, SAN DIEGO, CA 92198-0304
PO BOX 28305, SAN DIEGO, CA 92198-0305
PO BOX 28306, SAN DIEGO, CA 92198-0306
PO BOX 28307, SAN DIEGO, CA 92198-0307
PO BOX 28308, SAN DIEGO, CA 92198-0308
PO BOX 28309, SAN DIEGO, CA 92198-0309
PO BOX 28310, SAN DIEGO, CA 92198-0310
PO BOX 28311, SAN DIEGO, CA 92198-0311
PO BOX 28312, SAN DIEGO, CA 92198-0312
PO BOX 28313, SAN DIEGO, CA 92198-0313
PO BOX 28314, SAN DIEGO, CA 92198-0314
PO BOX 28315, SAN DIEGO, CA 92198-0315
PO BOX 28316, SAN DIEGO, CA 92198-0316
PO BOX 28317, SAN DIEGO, CA 92198-0317
PO BOX 28318, SAN DIEGO, CA 92198-0318
PO BOX 28319, SAN DIEGO, CA 92198-0319
PO BOX 28320, SAN DIEGO, CA 92198-0320
PO BOX 28321, SAN DIEGO, CA 92198-0321
PO BOX 28322, SAN DIEGO, CA 92198-0322
PO BOX 28323, SAN DIEGO, CA 92198-0323
PO BOX 28324, SAN DIEGO, CA 92198-0324
PO BOX 28325, SAN DIEGO, CA 92198-0325
PO BOX 28326, SAN DIEGO, CA 92198-0326
PO BOX 28327, SAN DIEGO, CA 92198-0327
PO BOX 28328, SAN DIEGO, CA 92198-0328
PO BOX 28329, SAN DIEGO, CA 92198-0329
PO BOX 28330, SAN DIEGO, CA 92198-0330
PO BOX 28331, SAN DIEGO, CA 92198-0331
PO BOX 28332, SAN DIEGO, CA 92198-0332
PO BOX 28333, SAN DIEGO, CA 92198-0333
PO BOX 28334, SAN DIEGO, CA 92198-0334
PO BOX 28335, SAN DIEGO, CA 92198-0335
PO BOX 28336, SAN DIEGO, CA 92198-0336
PO BOX 28337, SAN DIEGO, CA 92198-0337
PO BOX 28338, SAN DIEGO, CA 92198-0338
PO BOX 28339, SAN DIEGO, CA 92198-0339
PO BOX 28340, SAN DIEGO, CA 92198-0340
PO BOX 28341, SAN DIEGO, CA 92198-0341
PO BOX 28342, SAN DIEGO, CA 92198-0342
PO BOX 28343, SAN DIEGO, CA 92198-0343
PO BOX 28344, SAN DIEGO, CA 92198-0344
PO BOX 28345, SAN DIEGO, CA 92198-0345
PO BOX 28346, SAN DIEGO, CA 92198-0346
PO BOX 28347, SAN DIEGO, CA 92198-0347
PO BOX 28348, SAN DIEGO, CA 92198-0348
PO BOX 28349, SAN DIEGO, CA 92198-0349
PO BOX 28350, SAN DIEGO, CA 92198-0350
PO BOX 28351, SAN DIEGO, CA 92198-0351
PO BOX 28352, SAN DIEGO, CA 92198-0352
PO BOX 28353, SAN DIEGO, CA 92198-0353
PO BOX 28354, SAN DIEGO, CA 92198-0354
PO BOX 28355, SAN DIEGO, CA 92198-0355
PO BOX 28356, SAN DIEGO, CA 92198-0356
PO BOX 28357, SAN DIEGO, CA 92198-0357
PO BOX 28358, SAN DIEGO, CA 92198-0358
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