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, SOUTH SAN FRANCISCO, CA 94083-0321
PO BOX 322, SOUTH SAN FRANCISCO, CA 94083-0322
PO BOX 323, SOUTH SAN FRANCISCO, CA 94083-0323
PO BOX 324, SOUTH SAN FRANCISCO, CA 94083-0324
PO BOX 325, SOUTH SAN FRANCISCO, CA 94083-0325
PO BOX 326, SOUTH SAN FRANCISCO, CA 94083-0326
PO BOX 327, SOUTH SAN FRANCISCO, CA 94083-0327
PO BOX 328, SOUTH SAN FRANCISCO, CA 94083-0328
PO BOX 329, SOUTH SAN FRANCISCO, CA 94083-0329
PO BOX 330, SOUTH SAN FRANCISCO, CA 94083-0330
PO BOX 331, SOUTH SAN FRANCISCO, CA 94083-0331
PO BOX 332, SOUTH SAN FRANCISCO, CA 94083-0332
PO BOX 333, SOUTH SAN FRANCISCO, CA 94083-0333
PO BOX 334, SOUTH SAN FRANCISCO, CA 94083-0334
PO BOX 335, SOUTH SAN FRANCISCO, CA 94083-0335
PO BOX 336, SOUTH SAN FRANCISCO, CA 94083-0336
PO BOX 337, SOUTH SAN FRANCISCO, CA 94083-0337
PO BOX 338, SOUTH SAN FRANCISCO, CA 94083-0338
PO BOX 339, SOUTH SAN FRANCISCO, CA 94083-0339
PO BOX 340, SOUTH SAN FRANCISCO, CA 94083-0340
PO BOX 341, SOUTH SAN FRANCISCO, CA 94083-0341
PO BOX 342, SOUTH SAN FRANCISCO, CA 94083-0342
PO BOX 343, SOUTH SAN FRANCISCO, CA 94083-0343
PO BOX 344, SOUTH SAN FRANCISCO, CA 94083-0344
PO BOX 345, SOUTH SAN FRANCISCO, CA 94083-0345
PO BOX 346, SOUTH SAN FRANCISCO, CA 94083-0346
PO BOX 347, SOUTH SAN FRANCISCO, CA 94083-0347
PO BOX 348, SOUTH SAN FRANCISCO, CA 94083-0348
PO BOX 349, SOUTH SAN FRANCISCO, CA 94083-0349
PO BOX 350, SOUTH SAN FRANCISCO, CA 94083-0350
PO BOX 351, SOUTH SAN FRANCISCO, CA 94083-0351
PO BOX 352, SOUTH SAN FRANCISCO, CA 94083-0352
PO BOX 353, SOUTH SAN FRANCISCO, CA 94083-0353
PO BOX 354, SOUTH SAN FRANCISCO, CA 94083-0354
PO BOX 355, SOUTH SAN FRANCISCO, CA 94083-0355
PO BOX 356, SOUTH SAN FRANCISCO, CA 94083-0356
PO BOX 357, SOUTH SAN FRANCISCO, CA 94083-0357
PO BOX 358, SOUTH SAN FRANCISCO, CA 94083-0358
PO BOX 359, SOUTH SAN FRANCISCO, CA 94083-0359
PO BOX 360, SOUTH SAN FRANCISCO, CA 94083-0360
PO BOX 361, SOUTH SAN FRANCISCO, CA 94083-0361
PO BOX 362, SOUTH SAN FRANCISCO, CA 94083-0362
PO BOX 363, SOUTH SAN FRANCISCO, CA 94083-0363
PO BOX 364, SOUTH SAN FRANCISCO, CA 94083-0364
PO BOX 365, SOUTH SAN FRANCISCO, CA 94083-0365
PO BOX 366, SOUTH SAN FRANCISCO, CA 94083-0366
PO BOX 367, SOUTH SAN FRANCISCO, CA 94083-0367
PO BOX 368, SOUTH SAN FRANCISCO, CA 94083-0368
PO BOX 369, SOUTH SAN FRANCISCO, CA 94083-0369
PO BOX 370, SOUTH SAN FRANCISCO, CA 94083-0370
PO BOX 371, SOUTH SAN FRANCISCO, CA 94083-0371
PO BOX 372, SOUTH SAN FRANCISCO, CA 94083-0372
PO BOX 373, SOUTH SAN FRANCISCO, CA 94083-0373
PO BOX 374, SOUTH SAN FRANCISCO, CA 94083-0374
PO BOX 375, SOUTH SAN FRANCISCO, CA 94083-0375
PO BOX 376, SOUTH SAN FRANCISCO, CA 94083-0376
PO BOX 377, SOUTH SAN FRANCISCO, CA 94083-0377
PO BOX 378, SOUTH SAN FRANCISCO, CA 94083-0378
PO BOX 379, SOUTH SAN FRANCISCO, CA 94083-0379
PO BOX 380, SOUTH SAN FRANCISCO, CA 94083-0380
PO BOX 381, SOUTH SAN FRANCISCO, CA 94083-0381
PO BOX 382, SOUTH SAN FRANCISCO, CA 94083-0382
PO BOX 383, SOUTH SAN FRANCISCO, CA 94083-0383
PO BOX 384, SOUTH SAN FRANCISCO, CA 94083-0384
PO BOX 385, SOUTH SAN FRANCISCO, CA 94083-0385
PO BOX 386, SOUTH SAN FRANCISCO, CA 94083-0386
PO BOX 387, SOUTH SAN FRANCISCO, CA 94083-0387
PO BOX 388, SOUTH SAN FRANCISCO, CA 94083-0388
PO BOX 389, SOUTH SAN FRANCISCO, CA 94083-0389
PO BOX 390, SOUTH SAN FRANCISCO, CA 94083-0390
PO BOX 391, SOUTH SAN FRANCISCO, CA 94083-0391
PO BOX 392, SOUTH SAN FRANCISCO, CA 94083-0392
PO BOX 393, SOUTH SAN FRANCISCO, CA 94083-0393
PO BOX 394, SOUTH SAN FRANCISCO, CA 94083-0394
PO BOX 395, SOUTH SAN FRANCISCO, CA 94083-0395
PO BOX 396, SOUTH SAN FRANCISCO, CA 94083-0396
PO BOX 397, SOUTH SAN FRANCISCO, CA 94083-0397
PO BOX 398, SOUTH SAN FRANCISCO, CA 94083-0398
PO BOX 399, SOUTH SAN FRANCISCO, CA 94083-0399
PO BOX 400, SOUTH SAN FRANCISCO, CA 94083-0400
PO BOX 401, SOUTH SAN FRANCISCO, CA 94083-0401
PO BOX 402, SOUTH SAN FRANCISCO, CA 94083-0402
PO BOX 403, SOUTH SAN FRANCISCO, CA 94083-0403
PO BOX 404, SOUTH SAN FRANCISCO, CA 94083-0404
PO BOX 405, SOUTH SAN FRANCISCO, CA 94083-0405
PO BOX 406, SOUTH SAN FRANCISCO, CA 94083-0406
PO BOX 407, SOUTH SAN FRANCISCO, CA 94083-0407
PO BOX 408, SOUTH SAN FRANCISCO, CA 94083-0408
PO BOX 409, SOUTH SAN FRANCISCO, CA 94083-0409
PO BOX 410, SOUTH SAN FRANCISCO, CA 94083-0410
PO BOX 411, SOUTH SAN FRANCISCO, CA 94083-0411
PO BOX 412, SOUTH SAN FRANCISCO, CA 94083-0412
PO BOX 413, SOUTH SAN FRANCISCO, CA 94083-0413
PO BOX 414, SOUTH SAN FRANCISCO, CA 94083-0414
PO BOX 415, SOUTH SAN FRANCISCO, CA 94083-0415
PO BOX 416, SOUTH SAN FRANCISCO, CA 94083-0416
PO BOX 417, SOUTH SAN FRANCISCO, CA 94083-0417
PO BOX 418, SOUTH SAN FRANCISCO, CA 94083-0418
PO BOX 419, SOUTH SAN FRANCISCO, CA 94083-0419
PO BOX 420, SOUTH SAN FRANCISCO, CA 94083-0420
PO BOX 421, SOUTH SAN FRANCISCO, CA 94083-0421
PO BOX 422, SOUTH SAN FRANCISCO, CA 94083-0422
PO BOX 423, SOUTH SAN FRANCISCO, CA 94083-0423
PO BOX 424, SOUTH SAN FRANCISCO, CA 94083-0424
PO BOX 425, SOUTH SAN FRANCISCO, CA 94083-0425
PO BOX 426, SOUTH SAN FRANCISCO, CA 94083-0426
PO BOX 427, SOUTH SAN FRANCISCO, CA 94083-0427
PO BOX 428, SOUTH SAN FRANCISCO, CA 94083-0428
PO BOX 429, SOUTH SAN FRANCISCO, CA 94083-0429
PO BOX 430, SOUTH SAN FRANCISCO, CA 94083-0430
PO BOX 431, SOUTH SAN FRANCISCO, CA 94083-0431
PO BOX 432, SOUTH SAN FRANCISCO, CA 94083-0432
PO BOX 433, SOUTH SAN FRANCISCO, CA 94083-0433
PO BOX 434, SOUTH SAN FRANCISCO, CA 94083-0434
PO BOX 435, SOUTH SAN FRANCISCO, CA 94083-0435
PO BOX 436, SOUTH SAN FRANCISCO, CA 94083-0436
PO BOX 437, SOUTH SAN FRANCISCO, CA 94083-0437
PO BOX 438, SOUTH SAN FRANCISCO, CA 94083-0438
PO BOX 439, SOUTH SAN FRANCISCO, CA 94083-0439
PO BOX 440, SOUTH SAN FRANCISCO, CA 94083-0440
PO BOX 441, SOUTH SAN FRANCISCO, CA 94083-0441
PO BOX 442, SOUTH SAN FRANCISCO, CA 94083-0442
PO BOX 443, SOUTH SAN FRANCISCO, CA 94083-0443
PO BOX 444, SOUTH SAN FRANCISCO, CA 94083-0444
PO BOX 445, SOUTH SAN FRANCISCO, CA 94083-0445
PO BOX 446, SOUTH SAN FRANCISCO, CA 94083-0446
PO BOX 447, SOUTH SAN FRANCISCO, CA 94083-0447
PO BOX 448, SOUTH SAN FRANCISCO, CA 94083-0448
PO BOX 449, SOUTH SAN FRANCISCO, CA 94083-0449
PO BOX 450, SOUTH SAN FRANCISCO, CA 94083-0450
PO BOX 451, SOUTH SAN FRANCISCO, CA 94083-0451
PO BOX 452, SOUTH SAN FRANCISCO, CA 94083-0452
PO BOX 453, SOUTH SAN FRANCISCO, CA 94083-0453
PO BOX 454, SOUTH SAN FRANCISCO, CA 94083-0454
PO BOX 455, SOUTH SAN FRANCISCO, CA 94083-0455
PO BOX 456, SOUTH SAN FRANCISCO, CA 94083-0456
PO BOX 457, SOUTH SAN FRANCISCO, CA 94083-0457
PO BOX 458, SOUTH SAN FRANCISCO, CA 94083-0458
PO BOX 459, SOUTH SAN FRANCISCO, CA 94083-0459
PO BOX 460, SOUTH SAN FRANCISCO, CA 94083-0460
PO BOX 461, SOUTH SAN FRANCISCO, CA 94083-0461
PO BOX 462, SOUTH SAN FRANCISCO, CA 94083-0462
PO BOX 463, SOUTH SAN FRANCISCO, CA 94083-0463
PO BOX 464, SOUTH SAN FRANCISCO, CA 94083-0464
PO BOX 465, SOUTH SAN FRANCISCO, CA 94083-0465
PO BOX 466, SOUTH SAN FRANCISCO, CA 94083-0466
PO BOX 467, SOUTH SAN FRANCISCO, CA 94083-0467
PO BOX 468, SOUTH SAN FRANCISCO, CA 94083-0468
PO BOX 469, SOUTH SAN FRANCISCO, CA 94083-0469
PO BOX 470, SOUTH SAN FRANCISCO, CA 94083-0470
PO BOX 471, SOUTH SAN FRANCISCO, CA 94083-0471
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