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 371, BERKELEY, CA 94701-0371
PO BOX 372, BERKELEY, CA 94701-0372
PO BOX 373, BERKELEY, CA 94701-0373
PO BOX 374, BERKELEY, CA 94701-0374
PO BOX 375, BERKELEY, CA 94701-0375
PO BOX 376, BERKELEY, CA 94701-0376
PO BOX 377, BERKELEY, CA 94701-0377
PO BOX 378, BERKELEY, CA 94701-0378
PO BOX 379, BERKELEY, CA 94701-0379
PO BOX 380, BERKELEY, CA 94701-0380
PO BOX 381, BERKELEY, CA 94701-0381
PO BOX 382, BERKELEY, CA 94701-0382
PO BOX 383, BERKELEY, CA 94701-0383
PO BOX 384, BERKELEY, CA 94701-0384
PO BOX 385, BERKELEY, CA 94701-0385
PO BOX 386, BERKELEY, CA 94701-0386
PO BOX 387, BERKELEY, CA 94701-0387
PO BOX 388, BERKELEY, CA 94701-0388
PO BOX 389, BERKELEY, CA 94701-0389
PO BOX 390, BERKELEY, CA 94701-0390
PO BOX 391, BERKELEY, CA 94701-0391
PO BOX 392, BERKELEY, CA 94701-0392
PO BOX 393, BERKELEY, CA 94701-0393
PO BOX 394, BERKELEY, CA 94701-0394
PO BOX 395, BERKELEY, CA 94701-0395
PO BOX 396, BERKELEY, CA 94701-0396
PO BOX 397, BERKELEY, CA 94701-0397
PO BOX 398, BERKELEY, CA 94701-0398
PO BOX 399, BERKELEY, CA 94701-0399
PO BOX 400, BERKELEY, CA 94701-0400
PO BOX 401, BERKELEY, CA 94701-0401
PO BOX 402, BERKELEY, CA 94701-0402
PO BOX 403, BERKELEY, CA 94701-0403
PO BOX 404, BERKELEY, CA 94701-0404
PO BOX 405, BERKELEY, CA 94701-0405
PO BOX 406, BERKELEY, CA 94701-0406
PO BOX 407, BERKELEY, CA 94701-0407
PO BOX 408, BERKELEY, CA 94701-0408
PO BOX 409, BERKELEY, CA 94701-0409
PO BOX 410, BERKELEY, CA 94701-0410
PO BOX 411, BERKELEY, CA 94701-0411
PO BOX 412, BERKELEY, CA 94701-0412
PO BOX 413, BERKELEY, CA 94701-0413
PO BOX 414, BERKELEY, CA 94701-0414
PO BOX 415, BERKELEY, CA 94701-0415
PO BOX 416, BERKELEY, CA 94701-0416
PO BOX 417, BERKELEY, CA 94701-0417
PO BOX 418, BERKELEY, CA 94701-0418
PO BOX 419, BERKELEY, CA 94701-0419
PO BOX 420, BERKELEY, CA 94701-0420
PO BOX 421, BERKELEY, CA 94701-0421
PO BOX 422, BERKELEY, CA 94701-0422
PO BOX 423, BERKELEY, CA 94701-0423
PO BOX 424, BERKELEY, CA 94701-0424
PO BOX 425, BERKELEY, CA 94701-0425
PO BOX 426, BERKELEY, CA 94701-0426
PO BOX 427, BERKELEY, CA 94701-0427
PO BOX 428, BERKELEY, CA 94701-0428
PO BOX 429, BERKELEY, CA 94701-0429
PO BOX 430, BERKELEY, CA 94701-0430
PO BOX 431, BERKELEY, CA 94701-0431
PO BOX 432, BERKELEY, CA 94701-0432
PO BOX 433, BERKELEY, CA 94701-0433
PO BOX 434, BERKELEY, CA 94701-0434
PO BOX 435, BERKELEY, CA 94701-0435
PO BOX 436, BERKELEY, CA 94701-0436
PO BOX 437, BERKELEY, CA 94701-0437
PO BOX 438, BERKELEY, CA 94701-0438
PO BOX 439, BERKELEY, CA 94701-0439
PO BOX 440, BERKELEY, CA 94701-0440
PO BOX 441, BERKELEY, CA 94701-0441
PO BOX 442, BERKELEY, CA 94701-0442
PO BOX 443, BERKELEY, CA 94701-0443
PO BOX 444, BERKELEY, CA 94701-0444
PO BOX 445, BERKELEY, CA 94701-0445
PO BOX 446, BERKELEY, CA 94701-0446
PO BOX 447, BERKELEY, CA 94701-0447
PO BOX 448, BERKELEY, CA 94701-0448
PO BOX 449, BERKELEY, CA 94701-0449
PO BOX 450, BERKELEY, CA 94701-0450
PO BOX 451, BERKELEY, CA 94701-0451
PO BOX 452, BERKELEY, CA 94701-0452
PO BOX 453, BERKELEY, CA 94701-0453
PO BOX 454, BERKELEY, CA 94701-0454
PO BOX 455, BERKELEY, CA 94701-0455
PO BOX 456, BERKELEY, CA 94701-0456
PO BOX 457, BERKELEY, CA 94701-0457
PO BOX 458, BERKELEY, CA 94701-0458
PO BOX 459, BERKELEY, CA 94701-0459
PO BOX 460, BERKELEY, CA 94701-0460
PO BOX 461, BERKELEY, CA 94701-0461
PO BOX 462, BERKELEY, CA 94701-0462
PO BOX 463, BERKELEY, CA 94701-0463
PO BOX 464, BERKELEY, CA 94701-0464
PO BOX 465, BERKELEY, CA 94701-0465
PO BOX 466, BERKELEY, CA 94701-0466
PO BOX 467, BERKELEY, CA 94701-0467
PO BOX 468, BERKELEY, CA 94701-0468
PO BOX 469, BERKELEY, CA 94701-0469
PO BOX 470, BERKELEY, CA 94701-0470
PO BOX 471, BERKELEY, CA 94701-0471
PO BOX 472, BERKELEY, CA 94701-0472
PO BOX 473, BERKELEY, CA 94701-0473
PO BOX 474, BERKELEY, CA 94701-0474
PO BOX 475, BERKELEY, CA 94701-0475
PO BOX 476, BERKELEY, CA 94701-0476
PO BOX 477, BERKELEY, CA 94701-0477
PO BOX 478, BERKELEY, CA 94701-0478
PO BOX 479, BERKELEY, CA 94701-0479
PO BOX 480, BERKELEY, CA 94701-0480
PO BOX 481, BERKELEY, CA 94701-0481
PO BOX 482, BERKELEY, CA 94701-0482
PO BOX 483, BERKELEY, CA 94701-0483
PO BOX 484, BERKELEY, CA 94701-0484
PO BOX 485, BERKELEY, CA 94701-0485
PO BOX 486, BERKELEY, CA 94701-0486
PO BOX 487, BERKELEY, CA 94701-0487
PO BOX 488, BERKELEY, CA 94701-0488
PO BOX 489, BERKELEY, CA 94701-0489
PO BOX 490, BERKELEY, CA 94701-0490
PO BOX 491, BERKELEY, CA 94701-0491
PO BOX 492, BERKELEY, CA 94701-0492
PO BOX 493, BERKELEY, CA 94701-0493
PO BOX 494, BERKELEY, CA 94701-0494
PO BOX 495, BERKELEY, CA 94701-0495
PO BOX 496, BERKELEY, CA 94701-0496
PO BOX 497, BERKELEY, CA 94701-0497
PO BOX 498, BERKELEY, CA 94701-0498
PO BOX 499, BERKELEY, CA 94701-0499
PO BOX 500, BERKELEY, CA 94701-0500
PO BOX 501, BERKELEY, CA 94701-0501
PO BOX 502, BERKELEY, CA 94701-0502
PO BOX 503, BERKELEY, CA 94701-0503
PO BOX 504, BERKELEY, CA 94701-0504
PO BOX 505, BERKELEY, CA 94701-0505
PO BOX 506, BERKELEY, CA 94701-0506
PO BOX 507, BERKELEY, CA 94701-0507
PO BOX 508, BERKELEY, CA 94701-0508
PO BOX 509, BERKELEY, CA 94701-0509
PO BOX 510, BERKELEY, CA 94701-0510
PO BOX 511, BERKELEY, CA 94701-0511
PO BOX 512, BERKELEY, CA 94701-0512
PO BOX 513, BERKELEY, CA 94701-0513
PO BOX 514, BERKELEY, CA 94701-0514
PO BOX 515, BERKELEY, CA 94701-0515
PO BOX 516, BERKELEY, CA 94701-0516
PO BOX 517, BERKELEY, CA 94701-0517
PO BOX 518, BERKELEY, CA 94701-0518
PO BOX 519, BERKELEY, CA 94701-0519
PO BOX 520, BERKELEY, CA 94701-0520
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