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 361, SAN LUIS REY, CA 92068-0361
PO BOX 362, SAN LUIS REY, CA 92068-0362
PO BOX 363, SAN LUIS REY, CA 92068-0363
PO BOX 364, SAN LUIS REY, CA 92068-0364
PO BOX 365, SAN LUIS REY, CA 92068-0365
PO BOX 366, SAN LUIS REY, CA 92068-0366
PO BOX 367, SAN LUIS REY, CA 92068-0367
PO BOX 368, SAN LUIS REY, CA 92068-0368
PO BOX 369, SAN LUIS REY, CA 92068-0369
PO BOX 370, SAN LUIS REY, CA 92068-0370
PO BOX 371, SAN LUIS REY, CA 92068-0371
PO BOX 372, SAN LUIS REY, CA 92068-0372
PO BOX 373, SAN LUIS REY, CA 92068-0373
PO BOX 374, SAN LUIS REY, CA 92068-0374
PO BOX 375, SAN LUIS REY, CA 92068-0375
PO BOX 376, SAN LUIS REY, CA 92068-0376
PO BOX 377, SAN LUIS REY, CA 92068-0377
PO BOX 378, SAN LUIS REY, CA 92068-0378
PO BOX 379, SAN LUIS REY, CA 92068-0379
PO BOX 380, SAN LUIS REY, CA 92068-0380
PO BOX 381, SAN LUIS REY, CA 92068-0381
PO BOX 382, SAN LUIS REY, CA 92068-0382
PO BOX 383, SAN LUIS REY, CA 92068-0383
PO BOX 384, SAN LUIS REY, CA 92068-0384
PO BOX 385, SAN LUIS REY, CA 92068-0385
PO BOX 386, SAN LUIS REY, CA 92068-0386
PO BOX 387, SAN LUIS REY, CA 92068-0387
PO BOX 388, SAN LUIS REY, CA 92068-0388
PO BOX 389, SAN LUIS REY, CA 92068-0389
PO BOX 390, SAN LUIS REY, CA 92068-0390
PO BOX 391, SAN LUIS REY, CA 92068-0391
PO BOX 392, SAN LUIS REY, CA 92068-0392
PO BOX 393, SAN LUIS REY, CA 92068-0393
PO BOX 394, SAN LUIS REY, CA 92068-0394
PO BOX 395, SAN LUIS REY, CA 92068-0395
PO BOX 396, SAN LUIS REY, CA 92068-0396
PO BOX 397, SAN LUIS REY, CA 92068-0397
PO BOX 398, SAN LUIS REY, CA 92068-0398
PO BOX 399, SAN LUIS REY, CA 92068-0399
PO BOX 400, SAN LUIS REY, CA 92068-0400
PO BOX 401, SAN LUIS REY, CA 92068-0401
PO BOX 402, SAN LUIS REY, CA 92068-0402
PO BOX 403, SAN LUIS REY, CA 92068-0403
PO BOX 404, SAN LUIS REY, CA 92068-0404
PO BOX 405, SAN LUIS REY, CA 92068-0405
PO BOX 406, SAN LUIS REY, CA 92068-0406
PO BOX 407, SAN LUIS REY, CA 92068-0407
PO BOX 408, SAN LUIS REY, CA 92068-0408
PO BOX 409, SAN LUIS REY, CA 92068-0409
PO BOX 410, SAN LUIS REY, CA 92068-0410
PO BOX 411, SAN LUIS REY, CA 92068-0411
PO BOX 412, SAN LUIS REY, CA 92068-0412
PO BOX 413, SAN LUIS REY, CA 92068-0413
PO BOX 414, SAN LUIS REY, CA 92068-0414
PO BOX 415, SAN LUIS REY, CA 92068-0415
PO BOX 416, SAN LUIS REY, CA 92068-0416
PO BOX 417, SAN LUIS REY, CA 92068-0417
PO BOX 418, SAN LUIS REY, CA 92068-0418
PO BOX 419, SAN LUIS REY, CA 92068-0419
PO BOX 420, SAN LUIS REY, CA 92068-0420
PO BOX 421, SAN LUIS REY, CA 92068-0421
PO BOX 422, SAN LUIS REY, CA 92068-0422
PO BOX 423, SAN LUIS REY, CA 92068-0423
PO BOX 424, SAN LUIS REY, CA 92068-0424
PO BOX 425, SAN LUIS REY, CA 92068-0425
PO BOX 426, SAN LUIS REY, CA 92068-0426
PO BOX 427, SAN LUIS REY, CA 92068-0427
PO BOX 428, SAN LUIS REY, CA 92068-0428
PO BOX 429, SAN LUIS REY, CA 92068-0429
PO BOX 430, SAN LUIS REY, CA 92068-0430
PO BOX 431, SAN LUIS REY, CA 92068-0431
PO BOX 432, SAN LUIS REY, CA 92068-0432
PO BOX 433, SAN LUIS REY, CA 92068-0433
PO BOX 434, SAN LUIS REY, CA 92068-0434
PO BOX 435, SAN LUIS REY, CA 92068-0435
PO BOX 436, SAN LUIS REY, CA 92068-0436
PO BOX 437, SAN LUIS REY, CA 92068-0437
PO BOX 438, SAN LUIS REY, CA 92068-0438
PO BOX 439, SAN LUIS REY, CA 92068-0439
PO BOX 440, SAN LUIS REY, CA 92068-0440
PO BOX 441, SAN LUIS REY, CA 92068-0441
PO BOX 442, SAN LUIS REY, CA 92068-0442
PO BOX 443, SAN LUIS REY, CA 92068-0443
PO BOX 444, SAN LUIS REY, CA 92068-0444
PO BOX 445, SAN LUIS REY, CA 92068-0445
PO BOX 446, SAN LUIS REY, CA 92068-0446
PO BOX 447, SAN LUIS REY, CA 92068-0447
PO BOX 448, SAN LUIS REY, CA 92068-0448
PO BOX 449, SAN LUIS REY, CA 92068-0449
PO BOX 450, SAN LUIS REY, CA 92068-0450
PO BOX 451, SAN LUIS REY, CA 92068-0451
PO BOX 452, SAN LUIS REY, CA 92068-0452
PO BOX 453, SAN LUIS REY, CA 92068-0453
PO BOX 454, SAN LUIS REY, CA 92068-0454
PO BOX 455, SAN LUIS REY, CA 92068-0455
PO BOX 456, SAN LUIS REY, CA 92068-0456
PO BOX 457, SAN LUIS REY, CA 92068-0457
PO BOX 458, SAN LUIS REY, CA 92068-0458
PO BOX 459, SAN LUIS REY, CA 92068-0459
PO BOX 460, SAN LUIS REY, CA 92068-0460
PO BOX 461, SAN LUIS REY, CA 92068-0461
PO BOX 462, SAN LUIS REY, CA 92068-0462
PO BOX 463, SAN LUIS REY, CA 92068-0463
PO BOX 464, SAN LUIS REY, CA 92068-0464
PO BOX 465, SAN LUIS REY, CA 92068-0465
PO BOX 466, SAN LUIS REY, CA 92068-0466
PO BOX 467, SAN LUIS REY, CA 92068-0467
PO BOX 468, SAN LUIS REY, CA 92068-0468
PO BOX 469, SAN LUIS REY, CA 92068-0469
PO BOX 470, SAN LUIS REY, CA 92068-0470
PO BOX 471, SAN LUIS REY, CA 92068-0471
PO BOX 472, SAN LUIS REY, CA 92068-0472
PO BOX 473, SAN LUIS REY, CA 92068-0473
PO BOX 474, SAN LUIS REY, CA 92068-0474
PO BOX 475, SAN LUIS REY, CA 92068-0475
PO BOX 476, SAN LUIS REY, CA 92068-0476
PO BOX 477, SAN LUIS REY, CA 92068-0477
PO BOX 478, SAN LUIS REY, CA 92068-0478
PO BOX 479, SAN LUIS REY, CA 92068-0479
PO BOX 480, SAN LUIS REY, CA 92068-0480
PO BOX 481, SAN LUIS REY, CA 92068-0481
PO BOX 482, SAN LUIS REY, CA 92068-0482
PO BOX 483, SAN LUIS REY, CA 92068-0483
PO BOX 484, SAN LUIS REY, CA 92068-0484
PO BOX 485, SAN LUIS REY, CA 92068-0485
PO BOX 486, SAN LUIS REY, CA 92068-0486
PO BOX 487, SAN LUIS REY, CA 92068-0487
PO BOX 488, SAN LUIS REY, CA 92068-0488
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