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 16241, SAN DIEGO, CA 92176-6241
PO BOX 16242, SAN DIEGO, CA 92176-6242
PO BOX 16243, SAN DIEGO, CA 92176-6243
PO BOX 16244, SAN DIEGO, CA 92176-6244
PO BOX 16245, SAN DIEGO, CA 92176-6245
PO BOX 16246, SAN DIEGO, CA 92176-6246
PO BOX 16247, SAN DIEGO, CA 92176-6247
PO BOX 16248, SAN DIEGO, CA 92176-6248
PO BOX 16249, SAN DIEGO, CA 92176-6249
PO BOX 16250, SAN DIEGO, CA 92176-6250
PO BOX 16251, SAN DIEGO, CA 92176-6251
PO BOX 16252, SAN DIEGO, CA 92176-6252
PO BOX 16253, SAN DIEGO, CA 92176-6253
PO BOX 16254, SAN DIEGO, CA 92176-6254
PO BOX 16255, SAN DIEGO, CA 92176-6255
PO BOX 16256, SAN DIEGO, CA 92176-6256
PO BOX 16257, SAN DIEGO, CA 92176-6257
PO BOX 16258, SAN DIEGO, CA 92176-6258
PO BOX 16259, SAN DIEGO, CA 92176-6259
PO BOX 16260, SAN DIEGO, CA 92176-6260
PO BOX 16261, SAN DIEGO, CA 92176-6261
PO BOX 16262, SAN DIEGO, CA 92176-6262
PO BOX 16263, SAN DIEGO, CA 92176-6263
PO BOX 16264, SAN DIEGO, CA 92176-6264
PO BOX 16265, SAN DIEGO, CA 92176-6265
PO BOX 16266, SAN DIEGO, CA 92176-6266
PO BOX 16267, SAN DIEGO, CA 92176-6267
PO BOX 16268, SAN DIEGO, CA 92176-6268
PO BOX 16269, SAN DIEGO, CA 92176-6269
PO BOX 16270, SAN DIEGO, CA 92176-6270
PO BOX 16271, SAN DIEGO, CA 92176-6271
PO BOX 16272, SAN DIEGO, CA 92176-6272
PO BOX 16273, SAN DIEGO, CA 92176-6273
PO BOX 16274, SAN DIEGO, CA 92176-6274
PO BOX 16275, SAN DIEGO, CA 92176-6275
PO BOX 16276, SAN DIEGO, CA 92176-6276
PO BOX 16277, SAN DIEGO, CA 92176-6277
PO BOX 16278, SAN DIEGO, CA 92176-6278
PO BOX 16279, SAN DIEGO, CA 92176-6279
PO BOX 16280, SAN DIEGO, CA 92176-6280
PO BOX 16281, SAN DIEGO, CA 92176-6281
PO BOX 16282, SAN DIEGO, CA 92176-6282
PO BOX 16283, SAN DIEGO, CA 92176-6283
PO BOX 16284, SAN DIEGO, CA 92176-6284
PO BOX 16285, SAN DIEGO, CA 92176-6285
PO BOX 16286, SAN DIEGO, CA 92176-6286
PO BOX 16287, SAN DIEGO, CA 92176-6287
PO BOX 16288, SAN DIEGO, CA 92176-6288
PO BOX 16289, SAN DIEGO, CA 92176-6289
PO BOX 16290, SAN DIEGO, CA 92176-6290
PO BOX 16291, SAN DIEGO, CA 92176-6291
PO BOX 16292, SAN DIEGO, CA 92176-6292
PO BOX 16293, SAN DIEGO, CA 92176-6293
PO BOX 16294, SAN DIEGO, CA 92176-6294
PO BOX 16295, SAN DIEGO, CA 92176-6295
PO BOX 16296, SAN DIEGO, CA 92176-6296
PO BOX 16297, SAN DIEGO, CA 92176-6297
PO BOX 16298, SAN DIEGO, CA 92176-6298
PO BOX 16299, SAN DIEGO, CA 92176-6299
PO BOX 16300, SAN DIEGO, CA 92176-6300
PO BOX 16301, SAN DIEGO, CA 92176-6301
PO BOX 16302, SAN DIEGO, CA 92176-6302
PO BOX 16303, SAN DIEGO, CA 92176-6303
PO BOX 16304, SAN DIEGO, CA 92176-6304
PO BOX 16305, SAN DIEGO, CA 92176-6305
PO BOX 16306, SAN DIEGO, CA 92176-6306
PO BOX 16307, SAN DIEGO, CA 92176-6307
PO BOX 16308, SAN DIEGO, CA 92176-6308
PO BOX 16309, SAN DIEGO, CA 92176-6309
PO BOX 16310, SAN DIEGO, CA 92176-6310
PO BOX 16311, SAN DIEGO, CA 92176-6311
PO BOX 16312, SAN DIEGO, CA 92176-6312
PO BOX 16313, SAN DIEGO, CA 92176-6313
PO BOX 16314, SAN DIEGO, CA 92176-6314
PO BOX 16315, SAN DIEGO, CA 92176-6315
PO BOX 16316, SAN DIEGO, CA 92176-6316
PO BOX 16317, SAN DIEGO, CA 92176-6317
PO BOX 16318, SAN DIEGO, CA 92176-6318
PO BOX 16319, SAN DIEGO, CA 92176-6319
PO BOX 16320, SAN DIEGO, CA 92176-6320
PO BOX 16321, SAN DIEGO, CA 92176-6321
PO BOX 16322, SAN DIEGO, CA 92176-6322
PO BOX 16323, SAN DIEGO, CA 92176-6323
PO BOX 16324, SAN DIEGO, CA 92176-6324
PO BOX 16325, SAN DIEGO, CA 92176-6325
PO BOX 16326, SAN DIEGO, CA 92176-6326
PO BOX 16327, SAN DIEGO, CA 92176-6327
PO BOX 16328, SAN DIEGO, CA 92176-6328
PO BOX 16329, SAN DIEGO, CA 92176-6329
PO BOX 16330, SAN DIEGO, CA 92176-6330
PO BOX 16331, SAN DIEGO, CA 92176-6331
PO BOX 16332, SAN DIEGO, CA 92176-6332
PO BOX 16333, SAN DIEGO, CA 92176-6333
PO BOX 16334, SAN DIEGO, CA 92176-6334
PO BOX 16335, SAN DIEGO, CA 92176-6335
PO BOX 16336, SAN DIEGO, CA 92176-6336
PO BOX 16337, SAN DIEGO, CA 92176-6337
PO BOX 16338, SAN DIEGO, CA 92176-6338
PO BOX 16339, SAN DIEGO, CA 92176-6339
PO BOX 16340, SAN DIEGO, CA 92176-6340
PO BOX 16341, SAN DIEGO, CA 92176-6341
PO BOX 16342, SAN DIEGO, CA 92176-6342
PO BOX 16343, SAN DIEGO, CA 92176-6343
PO BOX 16344, SAN DIEGO, CA 92176-6344
PO BOX 16345, SAN DIEGO, CA 92176-6345
PO BOX 16346, SAN DIEGO, CA 92176-6346
PO BOX 16347, SAN DIEGO, CA 92176-6347
PO BOX 16348, SAN DIEGO, CA 92176-6348
PO BOX 16349, SAN DIEGO, CA 92176-6349
PO BOX 16350, SAN DIEGO, CA 92176-6350
PO BOX 16351, SAN DIEGO, CA 92176-6351
PO BOX 16352, SAN DIEGO, CA 92176-6352
PO BOX 16353, SAN DIEGO, CA 92176-6353
PO BOX 16354, SAN DIEGO, CA 92176-6354
PO BOX 16355, SAN DIEGO, CA 92176-6355
PO BOX 16356, SAN DIEGO, CA 92176-6356
PO BOX 16357, SAN DIEGO, CA 92176-6357
PO BOX 16358, SAN DIEGO, CA 92176-6358
PO BOX 16359, SAN DIEGO, CA 92176-6359
PO BOX 16360, SAN DIEGO, CA 92176-6360
PO BOX 16361, SAN DIEGO, CA 92176-6361
PO BOX 16362, SAN DIEGO, CA 92176-6362
PO BOX 16363, SAN DIEGO, CA 92176-6363
PO BOX 16364, SAN DIEGO, CA 92176-6364
PO BOX 16365, SAN DIEGO, CA 92176-6365
PO BOX 16366, SAN DIEGO, CA 92176-6366
PO BOX 16367, SAN DIEGO, CA 92176-6367
PO BOX 16368, SAN DIEGO, CA 92176-6368
PO BOX 16369, SAN DIEGO, CA 92176-6369
PO BOX 16370, SAN DIEGO, CA 92176-6370
PO BOX 16371, SAN DIEGO, CA 92176-6371
PO BOX 16372, SAN DIEGO, CA 92176-6372
PO BOX 16373, SAN DIEGO, CA 92176-6373
PO BOX 16374, SAN DIEGO, CA 92176-6374
PO BOX 16375, SAN DIEGO, CA 92176-6375
PO BOX 16376, SAN DIEGO, CA 92176-6376
PO BOX 16377, SAN DIEGO, CA 92176-6377
PO BOX 16378, SAN DIEGO, CA 92176-6378
PO BOX 16379, SAN DIEGO, CA 92176-6379
PO BOX 16380, SAN DIEGO, CA 92176-6380
PO BOX 16381, SAN DIEGO, CA 92176-6381
PO BOX 16382, SAN DIEGO, CA 92176-6382
PO BOX 16383, SAN DIEGO, CA 92176-6383
PO BOX 16384, SAN DIEGO, CA 92176-6384
PO BOX 16385, SAN DIEGO, CA 92176-6385
PO BOX 16386, SAN DIEGO, CA 92176-6386
PO BOX 16387, SAN DIEGO, CA 92176-6387
PO BOX 16388, SAN DIEGO, CA 92176-6388
PO BOX 16389, SAN DIEGO, CA 92176-6389
PO BOX 16390, SAN DIEGO, CA 92176-6390
PO BOX 16391, SAN DIEGO, CA 92176-6391
PO BOX 16392, SAN DIEGO, CA 92176-6392
PO BOX 16393, SAN DIEGO, CA 92176-6393
PO BOX 16394, SAN DIEGO, CA 92176-6394
PO BOX 16395, SAN DIEGO, CA 92176-6395
PO BOX 16396, SAN DIEGO, CA 92176-6396
PO BOX 16397, SAN DIEGO, CA 92176-6397
PO BOX 16398, SAN DIEGO, CA 92176-6398
PO BOX 16399, SAN DIEGO, CA 92176-6399
PO BOX 16400, SAN DIEGO, CA 92176-6400
PO BOX 16401, SAN DIEGO, CA 92176-6401
PO BOX 16402, SAN DIEGO, CA 92176-6402
PO BOX 16403, SAN DIEGO, CA 92176-6403
PO BOX 16404, SAN DIEGO, CA 92176-6404
PO BOX 16405, SAN DIEGO, CA 92176-6405
PO BOX 16406, SAN DIEGO, CA 92176-6406
PO BOX 16407, SAN DIEGO, CA 92176-6407
PO BOX 16408, SAN DIEGO, CA 92176-6408
PO BOX 16409, SAN DIEGO, CA 92176-6409
PO BOX 16410, SAN DIEGO, CA 92176-6410
PO BOX 16411, SAN DIEGO, CA 92176-6411
PO BOX 16412, SAN DIEGO, CA 92176-6412
PO BOX 16413, SAN DIEGO, CA 92176-6413
PO BOX 16414, SAN DIEGO, CA 92176-6414
PO BOX 16415, SAN DIEGO, CA 92176-6415
PO BOX 16416, SAN DIEGO, CA 92176-6416
PO BOX 16417, SAN DIEGO, CA 92176-6417
PO BOX 16418, SAN DIEGO, CA 92176-6418
PO BOX 16419, SAN DIEGO, CA 92176-6419
PO BOX 16420, SAN DIEGO, CA 92176-6420
PO BOX 16421, SAN DIEGO, CA 92176-6421
PO BOX 16422, SAN DIEGO, CA 92176-6422
PO BOX 16423, SAN DIEGO, CA 92176-6423
PO BOX 16424, SAN DIEGO, CA 92176-6424
PO BOX 16425, SAN DIEGO, CA 92176-6425
PO BOX 16426, SAN DIEGO, CA 92176-6426
PO BOX 16427, SAN DIEGO, CA 92176-6427
PO BOX 16428, SAN DIEGO, CA 92176-6428
PO BOX 16429, SAN DIEGO, CA 92176-6429
PO BOX 16430, SAN DIEGO, CA 92176-6430
PO BOX 16431, SAN DIEGO, CA 92176-6431
PO BOX 16432, SAN DIEGO, CA 92176-6432
PO BOX 16433, SAN DIEGO, CA 92176-6433
PO BOX 16434, SAN DIEGO, CA 92176-6434
PO BOX 16435, SAN DIEGO, CA 92176-6435
PO BOX 16436, SAN DIEGO, CA 92176-6436
PO BOX 16437, SAN DIEGO, CA 92176-6437
PO BOX 16438, SAN DIEGO, CA 92176-6438
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