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 321, SAN FERNANDO, CA 91341-0321
PO BOX 322, SAN FERNANDO, CA 91341-0322
PO BOX 323, SAN FERNANDO, CA 91341-0323
PO BOX 324, SAN FERNANDO, CA 91341-0324
PO BOX 325, SAN FERNANDO, CA 91341-0325
PO BOX 326, SAN FERNANDO, CA 91341-0326
PO BOX 327, SAN FERNANDO, CA 91341-0327
PO BOX 328, SAN FERNANDO, CA 91341-0328
PO BOX 329, SAN FERNANDO, CA 91341-0329
PO BOX 330, SAN FERNANDO, CA 91341-0330
PO BOX 331, SAN FERNANDO, CA 91341-0331
PO BOX 332, SAN FERNANDO, CA 91341-0332
PO BOX 333, SAN FERNANDO, CA 91341-0333
PO BOX 334, SAN FERNANDO, CA 91341-0334
PO BOX 335, SAN FERNANDO, CA 91341-0335
PO BOX 336, SAN FERNANDO, CA 91341-0336
PO BOX 337, SAN FERNANDO, CA 91341-0337
PO BOX 338, SAN FERNANDO, CA 91341-0338
PO BOX 339, SAN FERNANDO, CA 91341-0339
PO BOX 340, SAN FERNANDO, CA 91341-0340
PO BOX 341, SAN FERNANDO, CA 91341-0341
PO BOX 342, SAN FERNANDO, CA 91341-0342
PO BOX 343, SAN FERNANDO, CA 91341-0343
PO BOX 344, SAN FERNANDO, CA 91341-0344
PO BOX 345, SAN FERNANDO, CA 91341-0345
PO BOX 346, SAN FERNANDO, CA 91341-0346
PO BOX 347, SAN FERNANDO, CA 91341-0347
PO BOX 348, SAN FERNANDO, CA 91341-0348
PO BOX 349, SAN FERNANDO, CA 91341-0349
PO BOX 350, SAN FERNANDO, CA 91341-0350
PO BOX 351, SAN FERNANDO, CA 91341-0351
PO BOX 352, SAN FERNANDO, CA 91341-0352
PO BOX 353, SAN FERNANDO, CA 91341-0353
PO BOX 354, SAN FERNANDO, CA 91341-0354
PO BOX 355, SAN FERNANDO, CA 91341-0355
PO BOX 356, SAN FERNANDO, CA 91341-0356
PO BOX 357, SAN FERNANDO, CA 91341-0357
PO BOX 358, SAN FERNANDO, CA 91341-0358
PO BOX 359, SAN FERNANDO, CA 91341-0359
PO BOX 360, SAN FERNANDO, CA 91341-0360
PO BOX 361, SAN FERNANDO, CA 91341-0361
PO BOX 362, SAN FERNANDO, CA 91341-0362
PO BOX 363, SAN FERNANDO, CA 91341-0363
PO BOX 364, SAN FERNANDO, CA 91341-0364
PO BOX 365, SAN FERNANDO, CA 91341-0365
PO BOX 366, SAN FERNANDO, CA 91341-0366
PO BOX 367, SAN FERNANDO, CA 91341-0367
PO BOX 368, SAN FERNANDO, CA 91341-0368
PO BOX 369, SAN FERNANDO, CA 91341-0369
PO BOX 370, SAN FERNANDO, CA 91341-0370
PO BOX 371, SAN FERNANDO, CA 91341-0371
PO BOX 372, SAN FERNANDO, CA 91341-0372
PO BOX 373, SAN FERNANDO, CA 91341-0373
PO BOX 374, SAN FERNANDO, CA 91341-0374
PO BOX 375, SAN FERNANDO, CA 91341-0375
PO BOX 376, SAN FERNANDO, CA 91341-0376
PO BOX 377, SAN FERNANDO, CA 91341-0377
PO BOX 378, SAN FERNANDO, CA 91341-0378
PO BOX 379, SAN FERNANDO, CA 91341-0379
PO BOX 380, SAN FERNANDO, CA 91341-0380
PO BOX 381, SAN FERNANDO, CA 91341-0381
PO BOX 382, SAN FERNANDO, CA 91341-0382
PO BOX 383, SAN FERNANDO, CA 91341-0383
PO BOX 384, SAN FERNANDO, CA 91341-0384
PO BOX 385, SAN FERNANDO, CA 91341-0385
PO BOX 386, SAN FERNANDO, CA 91341-0386
PO BOX 387, SAN FERNANDO, CA 91341-0387
PO BOX 388, SAN FERNANDO, CA 91341-0388
PO BOX 389, SAN FERNANDO, CA 91341-0389
PO BOX 390, SAN FERNANDO, CA 91341-0390
PO BOX 391, SAN FERNANDO, CA 91341-0391
PO BOX 392, SAN FERNANDO, CA 91341-0392
PO BOX 393, SAN FERNANDO, CA 91341-0393
PO BOX 394, SAN FERNANDO, CA 91341-0394
PO BOX 395, SAN FERNANDO, CA 91341-0395
PO BOX 396, SAN FERNANDO, CA 91341-0396
PO BOX 397, SAN FERNANDO, CA 91341-0397
PO BOX 398, SAN FERNANDO, CA 91341-0398
PO BOX 399, SAN FERNANDO, CA 91341-0399
PO BOX 400, SAN FERNANDO, CA 91341-0400
PO BOX 401, SAN FERNANDO, CA 91341-0401
PO BOX 402, SAN FERNANDO, CA 91341-0402
PO BOX 403, SAN FERNANDO, CA 91341-0403
PO BOX 404, SAN FERNANDO, CA 91341-0404
PO BOX 405, SAN FERNANDO, CA 91341-0405
PO BOX 406, SAN FERNANDO, CA 91341-0406
PO BOX 407, SAN FERNANDO, CA 91341-0407
PO BOX 408, SAN FERNANDO, CA 91341-0408
PO BOX 409, SAN FERNANDO, CA 91341-0409
PO BOX 410, SAN FERNANDO, CA 91341-0410
PO BOX 411, SAN FERNANDO, CA 91341-0411
PO BOX 412, SAN FERNANDO, CA 91341-0412
PO BOX 413, SAN FERNANDO, CA 91341-0413
PO BOX 414, SAN FERNANDO, CA 91341-0414
PO BOX 415, SAN FERNANDO, CA 91341-0415
PO BOX 416, SAN FERNANDO, CA 91341-0416
PO BOX 417, SAN FERNANDO, CA 91341-0417
PO BOX 418, SAN FERNANDO, CA 91341-0418
PO BOX 419, SAN FERNANDO, CA 91341-0419
PO BOX 420, SAN FERNANDO, CA 91341-0420
PO BOX 421, SAN FERNANDO, CA 91341-0421
PO BOX 422, SAN FERNANDO, CA 91341-0422
PO BOX 423, SAN FERNANDO, CA 91341-0423
PO BOX 424, SAN FERNANDO, CA 91341-0424
PO BOX 425, SAN FERNANDO, CA 91341-0425
PO BOX 426, SAN FERNANDO, CA 91341-0426
PO BOX 427, SAN FERNANDO, CA 91341-0427
PO BOX 428, SAN FERNANDO, CA 91341-0428
PO BOX 429, SAN FERNANDO, CA 91341-0429
PO BOX 430, SAN FERNANDO, CA 91341-0430
PO BOX 431, SAN FERNANDO, CA 91341-0431
PO BOX 432, SAN FERNANDO, CA 91341-0432
PO BOX 433, SAN FERNANDO, CA 91341-0433
PO BOX 434, SAN FERNANDO, CA 91341-0434
PO BOX 435, SAN FERNANDO, CA 91341-0435
PO BOX 436, SAN FERNANDO, CA 91341-0436
PO BOX 437, SAN FERNANDO, CA 91341-0437
PO BOX 438, SAN FERNANDO, CA 91341-0438
PO BOX 439, SAN FERNANDO, CA 91341-0439
PO BOX 440, SAN FERNANDO, CA 91341-0440
PO BOX 441, SAN FERNANDO, CA 91341-0441
PO BOX 442, SAN FERNANDO, CA 91341-0442
PO BOX 443, SAN FERNANDO, CA 91341-0443
PO BOX 444, SAN FERNANDO, CA 91341-0444
PO BOX 445, SAN FERNANDO, CA 91341-0445
PO BOX 446, SAN FERNANDO, CA 91341-0446
PO BOX 447, SAN FERNANDO, CA 91341-0447
PO BOX 448, SAN FERNANDO, CA 91341-0448
PO BOX 449, SAN FERNANDO, CA 91341-0449
PO BOX 450, SAN FERNANDO, CA 91341-0450
PO BOX 451, SAN FERNANDO, CA 91341-0451
PO BOX 452, SAN FERNANDO, CA 91341-0452
PO BOX 453, SAN FERNANDO, CA 91341-0453
PO BOX 454, SAN FERNANDO, CA 91341-0454
PO BOX 455, SAN FERNANDO, CA 91341-0455
PO BOX 456, SAN FERNANDO, CA 91341-0456
PO BOX 457, SAN FERNANDO, CA 91341-0457
PO BOX 458, SAN FERNANDO, CA 91341-0458
PO BOX 459, SAN FERNANDO, CA 91341-0459
PO BOX 460, SAN FERNANDO, CA 91341-0460
PO BOX 461, SAN FERNANDO, CA 91341-0461
PO BOX 462, SAN FERNANDO, CA 91341-0462
PO BOX 463, SAN FERNANDO, CA 91341-0463
PO BOX 464, SAN FERNANDO, CA 91341-0464
PO BOX 465, SAN FERNANDO, CA 91341-0465
PO BOX 466, SAN FERNANDO, CA 91341-0466
PO BOX 467, SAN FERNANDO, CA 91341-0467
PO BOX 468, SAN FERNANDO, CA 91341-0468
PO BOX 469, SAN FERNANDO, CA 91341-0469
PO BOX 470, SAN FERNANDO, CA 91341-0470
PO BOX 471, SAN FERNANDO, CA 91341-0471
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