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 281, SAN BERNARDINO, CA 92402-0281
PO BOX 282, SAN BERNARDINO, CA 92402-0282
PO BOX 283, SAN BERNARDINO, CA 92402-0283
PO BOX 284, SAN BERNARDINO, CA 92402-0284
PO BOX 285, SAN BERNARDINO, CA 92402-0285
PO BOX 286, SAN BERNARDINO, CA 92402-0286
PO BOX 287, SAN BERNARDINO, CA 92402-0287
PO BOX 288, SAN BERNARDINO, CA 92402-0288
PO BOX 289, SAN BERNARDINO, CA 92402-0289
PO BOX 290, SAN BERNARDINO, CA 92402-0290
PO BOX 291, SAN BERNARDINO, CA 92402-0291
PO BOX 292, SAN BERNARDINO, CA 92402-0292
PO BOX 293, SAN BERNARDINO, CA 92402-0293
PO BOX 294, SAN BERNARDINO, CA 92402-0294
PO BOX 295, SAN BERNARDINO, CA 92402-0295
PO BOX 296, SAN BERNARDINO, CA 92402-0296
PO BOX 297, SAN BERNARDINO, CA 92402-0297
PO BOX 298, SAN BERNARDINO, CA 92402-0298
PO BOX 299, SAN BERNARDINO, CA 92402-0299
PO BOX 300, SAN BERNARDINO, CA 92402-0300
PO BOX 301, SAN BERNARDINO, CA 92402-0301
PO BOX 302, SAN BERNARDINO, CA 92402-0302
PO BOX 303, SAN BERNARDINO, CA 92402-0303
PO BOX 304, SAN BERNARDINO, CA 92402-0304
PO BOX 305, SAN BERNARDINO, CA 92402-0305
PO BOX 306, SAN BERNARDINO, CA 92402-0306
PO BOX 307, SAN BERNARDINO, CA 92402-0307
PO BOX 308, SAN BERNARDINO, CA 92402-0308
PO BOX 309, SAN BERNARDINO, CA 92402-0309
PO BOX 310, SAN BERNARDINO, CA 92402-0310
PO BOX 311, SAN BERNARDINO, CA 92402-0311
PO BOX 312, SAN BERNARDINO, CA 92402-0312
PO BOX 313, SAN BERNARDINO, CA 92402-0313
PO BOX 314, SAN BERNARDINO, CA 92402-0314
PO BOX 315, SAN BERNARDINO, CA 92402-0315
PO BOX 316, SAN BERNARDINO, CA 92402-0316
PO BOX 317, SAN BERNARDINO, CA 92402-0317
PO BOX 318, SAN BERNARDINO, CA 92402-0318
PO BOX 319, SAN BERNARDINO, CA 92402-0319
PO BOX 320, SAN BERNARDINO, CA 92402-0320
PO BOX 321, SAN BERNARDINO, CA 92402-0321
PO BOX 322, SAN BERNARDINO, CA 92402-0322
PO BOX 323, SAN BERNARDINO, CA 92402-0323
PO BOX 324, SAN BERNARDINO, CA 92402-0324
PO BOX 325, SAN BERNARDINO, CA 92402-0325
PO BOX 326, SAN BERNARDINO, CA 92402-0326
PO BOX 327, SAN BERNARDINO, CA 92402-0327
PO BOX 328, SAN BERNARDINO, CA 92402-0328
PO BOX 329, SAN BERNARDINO, CA 92402-0329
PO BOX 330, SAN BERNARDINO, CA 92402-0330
PO BOX 331, SAN BERNARDINO, CA 92402-0331
PO BOX 332, SAN BERNARDINO, CA 92402-0332
PO BOX 333, SAN BERNARDINO, CA 92402-0333
PO BOX 334, SAN BERNARDINO, CA 92402-0334
PO BOX 335, SAN BERNARDINO, CA 92402-0335
PO BOX 336, SAN BERNARDINO, CA 92402-0336
PO BOX 337, SAN BERNARDINO, CA 92402-0337
PO BOX 338, SAN BERNARDINO, CA 92402-0338
PO BOX 339, SAN BERNARDINO, CA 92402-0339
PO BOX 340, SAN BERNARDINO, CA 92402-0340
PO BOX 341, SAN BERNARDINO, CA 92402-0341
PO BOX 342, SAN BERNARDINO, CA 92402-0342
PO BOX 343, SAN BERNARDINO, CA 92402-0343
PO BOX 344, SAN BERNARDINO, CA 92402-0344
PO BOX 345, SAN BERNARDINO, CA 92402-0345
PO BOX 346, SAN BERNARDINO, CA 92402-0346
PO BOX 347, SAN BERNARDINO, CA 92402-0347
PO BOX 348, SAN BERNARDINO, CA 92402-0348
PO BOX 349, SAN BERNARDINO, CA 92402-0349
PO BOX 350, SAN BERNARDINO, CA 92402-0350
PO BOX 351, SAN BERNARDINO, CA 92402-0351
PO BOX 352, SAN BERNARDINO, CA 92402-0352
PO BOX 353, SAN BERNARDINO, CA 92402-0353
PO BOX 354, SAN BERNARDINO, CA 92402-0354
PO BOX 355, SAN BERNARDINO, CA 92402-0355
PO BOX 356, SAN BERNARDINO, CA 92402-0356
PO BOX 357, SAN BERNARDINO, CA 92402-0357
PO BOX 358, SAN BERNARDINO, CA 92402-0358
PO BOX 359, SAN BERNARDINO, CA 92402-0359
PO BOX 360, SAN BERNARDINO, CA 92402-0360
PO BOX 361, SAN BERNARDINO, CA 92402-0361
PO BOX 362, SAN BERNARDINO, CA 92402-0362
PO BOX 363, SAN BERNARDINO, CA 92402-0363
PO BOX 364, SAN BERNARDINO, CA 92402-0364
PO BOX 365, SAN BERNARDINO, CA 92402-0365
PO BOX 366, SAN BERNARDINO, CA 92402-0366
PO BOX 367, SAN BERNARDINO, CA 92402-0367
PO BOX 368, SAN BERNARDINO, CA 92402-0368
PO BOX 369, SAN BERNARDINO, CA 92402-0369
PO BOX 370, SAN BERNARDINO, CA 92402-0370
PO BOX 371, SAN BERNARDINO, CA 92402-0371
PO BOX 372, SAN BERNARDINO, CA 92402-0372
PO BOX 373, SAN BERNARDINO, CA 92402-0373
PO BOX 374, SAN BERNARDINO, CA 92402-0374
PO BOX 375, SAN BERNARDINO, CA 92402-0375
PO BOX 376, SAN BERNARDINO, CA 92402-0376
PO BOX 377, SAN BERNARDINO, CA 92402-0377
PO BOX 378, SAN BERNARDINO, CA 92402-0378
PO BOX 379, SAN BERNARDINO, CA 92402-0379
PO BOX 380, SAN BERNARDINO, CA 92402-0380
PO BOX 381, SAN BERNARDINO, CA 92402-0381
PO BOX 382, SAN BERNARDINO, CA 92402-0382
PO BOX 383, SAN BERNARDINO, CA 92402-0383
PO BOX 384, SAN BERNARDINO, CA 92402-0384
PO BOX 385, SAN BERNARDINO, CA 92402-0385
PO BOX 386, SAN BERNARDINO, CA 92402-0386
PO BOX 387, SAN BERNARDINO, CA 92402-0387
PO BOX 388, SAN BERNARDINO, CA 92402-0388
PO BOX 389, SAN BERNARDINO, CA 92402-0389
PO BOX 390, SAN BERNARDINO, CA 92402-0390
PO BOX 391, SAN BERNARDINO, CA 92402-0391
PO BOX 392, SAN BERNARDINO, CA 92402-0392
PO BOX 393, SAN BERNARDINO, CA 92402-0393
PO BOX 394, SAN BERNARDINO, CA 92402-0394
PO BOX 395, SAN BERNARDINO, CA 92402-0395
PO BOX 396, SAN BERNARDINO, CA 92402-0396
PO BOX 397, SAN BERNARDINO, CA 92402-0397
PO BOX 398, SAN BERNARDINO, CA 92402-0398
PO BOX 399, SAN BERNARDINO, CA 92402-0399
PO BOX 400, SAN BERNARDINO, CA 92402-0400
PO BOX 401, SAN BERNARDINO, CA 92402-0401
PO BOX 402, SAN BERNARDINO, CA 92402-0402
PO BOX 403, SAN BERNARDINO, CA 92402-0403
PO BOX 404, SAN BERNARDINO, CA 92402-0404
PO BOX 405, SAN BERNARDINO, CA 92402-0405
PO BOX 406, SAN BERNARDINO, CA 92402-0406
PO BOX 407, SAN BERNARDINO, CA 92402-0407
PO BOX 408, SAN BERNARDINO, CA 92402-0408
PO BOX 409, SAN BERNARDINO, CA 92402-0409
PO BOX 410, SAN BERNARDINO, CA 92402-0410
PO BOX 411, SAN BERNARDINO, CA 92402-0411
PO BOX 412, SAN BERNARDINO, CA 92402-0412
PO BOX 413, SAN BERNARDINO, CA 92402-0413
PO BOX 414, SAN BERNARDINO, CA 92402-0414
PO BOX 415, SAN BERNARDINO, CA 92402-0415
PO BOX 416, SAN BERNARDINO, CA 92402-0416
PO BOX 417, SAN BERNARDINO, CA 92402-0417
PO BOX 418, SAN BERNARDINO, CA 92402-0418
PO BOX 419, SAN BERNARDINO, CA 92402-0419
PO BOX 420, SAN BERNARDINO, CA 92402-0420
PO BOX 421, SAN BERNARDINO, CA 92402-0421
PO BOX 422, SAN BERNARDINO, CA 92402-0422
PO BOX 423, SAN BERNARDINO, CA 92402-0423
PO BOX 424, SAN BERNARDINO, CA 92402-0424
PO BOX 425, SAN BERNARDINO, CA 92402-0425
PO BOX 426, SAN BERNARDINO, CA 92402-0426
PO BOX 427, SAN BERNARDINO, CA 92402-0427
PO BOX 428, SAN BERNARDINO, CA 92402-0428
PO BOX 429, SAN BERNARDINO, CA 92402-0429
PO BOX 430, SAN BERNARDINO, CA 92402-0430
PO BOX 431, SAN BERNARDINO, CA 92402-0431
PO BOX 432, SAN BERNARDINO, CA 92402-0432
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