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 393339, SAN FRANCISCO, CA 94139-3339
PO BOX 393340, SAN FRANCISCO, CA 94139-3340
PO BOX 393341, SAN FRANCISCO, CA 94139-3341
PO BOX 393342, SAN FRANCISCO, CA 94139-3342
PO BOX 393343, SAN FRANCISCO, CA 94139-3343
PO BOX 393344, SAN FRANCISCO, CA 94139-3344
PO BOX 393345, SAN FRANCISCO, CA 94139-3345
PO BOX 393346, SAN FRANCISCO, CA 94139-3346
PO BOX 393347, SAN FRANCISCO, CA 94139-3347
PO BOX 393348, SAN FRANCISCO, CA 94139-3348
PO BOX 393349, SAN FRANCISCO, CA 94139-3349
PO BOX 393350, SAN FRANCISCO, CA 94139-3350
PO BOX 393351, SAN FRANCISCO, CA 94139-3351
PO BOX 393352, SAN FRANCISCO, CA 94139-3352
PO BOX 393353, SAN FRANCISCO, CA 94139-3353
PO BOX 393354, SAN FRANCISCO, CA 94139-3354
PO BOX 393355, SAN FRANCISCO, CA 94139-3355
PO BOX 393356, SAN FRANCISCO, CA 94139-3356
PO BOX 393357, SAN FRANCISCO, CA 94139-3357
PO BOX 393358, SAN FRANCISCO, CA 94139-3358
PO BOX 393359, SAN FRANCISCO, CA 94139-3359
PO BOX 393360, SAN FRANCISCO, CA 94139-3360
PO BOX 393361, SAN FRANCISCO, CA 94139-3361
PO BOX 393362, SAN FRANCISCO, CA 94139-3362
PO BOX 393363, SAN FRANCISCO, CA 94139-3363
PO BOX 393364, SAN FRANCISCO, CA 94139-3364
PO BOX 393365, SAN FRANCISCO, CA 94139-3365
PO BOX 393366, SAN FRANCISCO, CA 94139-3366
PO BOX 393367, SAN FRANCISCO, CA 94139-3367
PO BOX 393368, SAN FRANCISCO, CA 94139-3368
PO BOX 393369, SAN FRANCISCO, CA 94139-3369
PO BOX 393370, SAN FRANCISCO, CA 94139-3370
PO BOX 393371, SAN FRANCISCO, CA 94139-3371
PO BOX 393372, SAN FRANCISCO, CA 94139-3372
PO BOX 393373, SAN FRANCISCO, CA 94139-3373
PO BOX 393374, SAN FRANCISCO, CA 94139-3374
PO BOX 393375, SAN FRANCISCO, CA 94139-3375
PO BOX 393376, SAN FRANCISCO, CA 94139-3376
PO BOX 393377, SAN FRANCISCO, CA 94139-3377
PO BOX 393378, SAN FRANCISCO, CA 94139-3378
PO BOX 393379, SAN FRANCISCO, CA 94139-3379
PO BOX 393380, SAN FRANCISCO, CA 94139-3380
PO BOX 393381, SAN FRANCISCO, CA 94139-3381
PO BOX 393382, SAN FRANCISCO, CA 94139-3382
PO BOX 393383, SAN FRANCISCO, CA 94139-3383
PO BOX 393384, SAN FRANCISCO, CA 94139-3384
PO BOX 393385, SAN FRANCISCO, CA 94139-3385
PO BOX 393386, SAN FRANCISCO, CA 94139-3386
PO BOX 393387, SAN FRANCISCO, CA 94139-3387
PO BOX 393388, SAN FRANCISCO, CA 94139-3388
PO BOX 393389, SAN FRANCISCO, CA 94139-3389
PO BOX 393390, SAN FRANCISCO, CA 94139-3390
PO BOX 393391, SAN FRANCISCO, CA 94139-3391
PO BOX 393392, SAN FRANCISCO, CA 94139-3392
PO BOX 393393, SAN FRANCISCO, CA 94139-3393
PO BOX 393394, SAN FRANCISCO, CA 94139-3394
PO BOX 393395, SAN FRANCISCO, CA 94139-3395
PO BOX 393396, SAN FRANCISCO, CA 94139-3396
PO BOX 393397, SAN FRANCISCO, CA 94139-3397
PO BOX 393398, SAN FRANCISCO, CA 94139-3398
PO BOX 393399, SAN FRANCISCO, CA 94139-3399
PO BOX 393400, SAN FRANCISCO, CA 94139-3400
PO BOX 393401, SAN FRANCISCO, CA 94139-3401
PO BOX 393402, SAN FRANCISCO, CA 94139-3402
PO BOX 393403, SAN FRANCISCO, CA 94139-3403
PO BOX 393404, SAN FRANCISCO, CA 94139-3404
PO BOX 393405, SAN FRANCISCO, CA 94139-3405
PO BOX 393406, SAN FRANCISCO, CA 94139-3406
PO BOX 393407, SAN FRANCISCO, CA 94139-3407
PO BOX 393408, SAN FRANCISCO, CA 94139-3408
PO BOX 393409, SAN FRANCISCO, CA 94139-3409
PO BOX 393410, SAN FRANCISCO, CA 94139-3410
PO BOX 393411, SAN FRANCISCO, CA 94139-3411
PO BOX 393412, SAN FRANCISCO, CA 94139-3412
PO BOX 393413, SAN FRANCISCO, CA 94139-3413
PO BOX 393414, SAN FRANCISCO, CA 94139-3414
PO BOX 393415, SAN FRANCISCO, CA 94139-3415
PO BOX 393416, SAN FRANCISCO, CA 94139-3416
PO BOX 393417, SAN FRANCISCO, CA 94139-3417
PO BOX 393418, SAN FRANCISCO, CA 94139-3418
PO BOX 393419, SAN FRANCISCO, CA 94139-3419
PO BOX 393420, SAN FRANCISCO, CA 94139-3420
PO BOX 393421, SAN FRANCISCO, CA 94139-3421
PO BOX 393422, SAN FRANCISCO, CA 94139-3422
PO BOX 393423, SAN FRANCISCO, CA 94139-3423
PO BOX 393424, SAN FRANCISCO, CA 94139-3424
PO BOX 393425, SAN FRANCISCO, CA 94139-3425
PO BOX 393426, SAN FRANCISCO, CA 94139-3426
PO BOX 393427, SAN FRANCISCO, CA 94139-3427
PO BOX 393428, SAN FRANCISCO, CA 94139-3428
PO BOX 393429, SAN FRANCISCO, CA 94139-3429
PO BOX 393430, SAN FRANCISCO, CA 94139-3430
PO BOX 393431, SAN FRANCISCO, CA 94139-3431
PO BOX 393432, SAN FRANCISCO, CA 94139-3432
PO BOX 393433, SAN FRANCISCO, CA 94139-3433
PO BOX 393434, SAN FRANCISCO, CA 94139-3434
PO BOX 393435, SAN FRANCISCO, CA 94139-3435
PO BOX 393436, SAN FRANCISCO, CA 94139-3436
PO BOX 393437, SAN FRANCISCO, CA 94139-3437
PO BOX 393438, SAN FRANCISCO, CA 94139-3438
PO BOX 393439, SAN FRANCISCO, CA 94139-3439
PO BOX 393440, SAN FRANCISCO, CA 94139-3440
PO BOX 393441, SAN FRANCISCO, CA 94139-3441
PO BOX 393442, SAN FRANCISCO, CA 94139-3442
PO BOX 393443, SAN FRANCISCO, CA 94139-3443
PO BOX 393444, SAN FRANCISCO, CA 94139-3444
PO BOX 393445, SAN FRANCISCO, CA 94139-3445
PO BOX 393446, SAN FRANCISCO, CA 94139-3446
PO BOX 393447, SAN FRANCISCO, CA 94139-3447
PO BOX 393448, SAN FRANCISCO, CA 94139-3448
PO BOX 393449, SAN FRANCISCO, CA 94139-3449
PO BOX 393450, SAN FRANCISCO, CA 94139-3450
PO BOX 393451, SAN FRANCISCO, CA 94139-3451
PO BOX 393452, SAN FRANCISCO, CA 94139-3452
PO BOX 393453, SAN FRANCISCO, CA 94139-3453
PO BOX 393454, SAN FRANCISCO, CA 94139-3454
PO BOX 393455, SAN FRANCISCO, CA 94139-3455
PO BOX 393456, SAN FRANCISCO, CA 94139-3456
PO BOX 393457, SAN FRANCISCO, CA 94139-3457
PO BOX 393458, SAN FRANCISCO, CA 94139-3458
PO BOX 393459, SAN FRANCISCO, CA 94139-3459
PO BOX 393460, SAN FRANCISCO, CA 94139-3460
PO BOX 393461, SAN FRANCISCO, CA 94139-3461
PO BOX 393462, SAN FRANCISCO, CA 94139-3462
PO BOX 393463, SAN FRANCISCO, CA 94139-3463
PO BOX 393464, SAN FRANCISCO, CA 94139-3464
PO BOX 393465, SAN FRANCISCO, CA 94139-3465
PO BOX 393466, SAN FRANCISCO, CA 94139-3466
PO BOX 393467, SAN FRANCISCO, CA 94139-3467
PO BOX 393468, SAN FRANCISCO, CA 94139-3468
PO BOX 393469, SAN FRANCISCO, CA 94139-3469
PO BOX 393470, SAN FRANCISCO, CA 94139-3470
PO BOX 393471, SAN FRANCISCO, CA 94139-3471
PO BOX 393472, SAN FRANCISCO, CA 94139-3472
PO BOX 393473, SAN FRANCISCO, CA 94139-3473
PO BOX 393474, SAN FRANCISCO, CA 94139-3474
PO BOX 393475, SAN FRANCISCO, CA 94139-3475
PO BOX 393476, SAN FRANCISCO, CA 94139-3476
PO BOX 393477, SAN FRANCISCO, CA 94139-3477
PO BOX 393478, SAN FRANCISCO, CA 94139-3478
PO BOX 393479, SAN FRANCISCO, CA 94139-3479
PO BOX 393480, SAN FRANCISCO, CA 94139-3480
PO BOX 393481, SAN FRANCISCO, CA 94139-3481
PO BOX 393482, SAN FRANCISCO, CA 94139-3482
PO BOX 393483, SAN FRANCISCO, CA 94139-3483
PO BOX 393484, SAN FRANCISCO, CA 94139-3484
PO BOX 393485, SAN FRANCISCO, CA 94139-3485
PO BOX 393486, SAN FRANCISCO, CA 94139-3486
PO BOX 393487, SAN FRANCISCO, CA 94139-3487
PO BOX 393488, SAN FRANCISCO, CA 94139-3488
PO BOX 393489, SAN FRANCISCO, CA 94139-3489
PO BOX 393490, SAN FRANCISCO, CA 94139-3490
PO BOX 393491, SAN FRANCISCO, CA 94139-3491
PO BOX 393492, SAN FRANCISCO, CA 94139-3492
PO BOX 393493, SAN FRANCISCO, CA 94139-3493
PO BOX 393494, SAN FRANCISCO, CA 94139-3494
PO BOX 393495, SAN FRANCISCO, CA 94139-3495
PO BOX 393496, SAN FRANCISCO, CA 94139-3496
PO BOX 393497, SAN FRANCISCO, CA 94139-3497
PO BOX 393498, SAN FRANCISCO, CA 94139-3498
PO BOX 393499, SAN FRANCISCO, CA 94139-3499
PO BOX 393500, SAN FRANCISCO, CA 94139-3500
PO BOX 393501, SAN FRANCISCO, CA 94139-3501
PO BOX 393502, SAN FRANCISCO, CA 94139-3502
PO BOX 393503, SAN FRANCISCO, CA 94139-3503
PO BOX 393504, SAN FRANCISCO, CA 94139-3504
PO BOX 393505, SAN FRANCISCO, CA 94139-3505
PO BOX 393506, SAN FRANCISCO, CA 94139-3506
PO BOX 393507, SAN FRANCISCO, CA 94139-3507
PO BOX 393508, SAN FRANCISCO, CA 94139-3508
PO BOX 393509, SAN FRANCISCO, CA 94139-3509
PO BOX 393510, SAN FRANCISCO, CA 94139-3510
PO BOX 393511, SAN FRANCISCO, CA 94139-3511
PO BOX 393512, SAN FRANCISCO, CA 94139-3512
PO BOX 393513, SAN FRANCISCO, CA 94139-3513
PO BOX 393514, SAN FRANCISCO, CA 94139-3514
PO BOX 393515, SAN FRANCISCO, CA 94139-3515
PO BOX 393516, SAN FRANCISCO, CA 94139-3516
PO BOX 393517, SAN FRANCISCO, CA 94139-3517
PO BOX 393518, SAN FRANCISCO, CA 94139-3518
PO BOX 393519, SAN FRANCISCO, CA 94139-3519
PO BOX 393520, SAN FRANCISCO, CA 94139-3520
PO BOX 393521, SAN FRANCISCO, CA 94139-3521
PO BOX 393522, SAN FRANCISCO, CA 94139-3522
PO BOX 393523, SAN FRANCISCO, CA 94139-3523
PO BOX 393524, SAN FRANCISCO, CA 94139-3524
PO BOX 393525, SAN FRANCISCO, CA 94139-3525
PO BOX 393526, SAN FRANCISCO, CA 94139-3526
PO BOX 393527, SAN FRANCISCO, CA 94139-3527
PO BOX 393528, SAN FRANCISCO, CA 94139-3528
PO BOX 393529, SAN FRANCISCO, CA 94139-3529
PO BOX 393530, SAN FRANCISCO, CA 94139-3530
PO BOX 393531, SAN FRANCISCO, CA 94139-3531
PO BOX 393532, SAN FRANCISCO, CA 94139-3532
PO BOX 393533, SAN FRANCISCO, CA 94139-3533
PO BOX 393534, SAN FRANCISCO, CA 94139-3534
PO BOX 393535, SAN FRANCISCO, CA 94139-3535
PO BOX 393536, SAN FRANCISCO, CA 94139-3536
PO BOX 393537, SAN FRANCISCO, CA 94139-3537
PO BOX 393538, SAN FRANCISCO, CA 94139-3538
PO BOX 393539, SAN FRANCISCO, CA 94139-3539
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