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 3391, LANCASTER, CA 93586-3391
PO BOX 3392, LANCASTER, CA 93586-3392
PO BOX 3393, LANCASTER, CA 93586-3393
PO BOX 3394, LANCASTER, CA 93586-3394
PO BOX 3395, LANCASTER, CA 93586-3395
PO BOX 3396, LANCASTER, CA 93586-3396
PO BOX 3397, LANCASTER, CA 93586-3397
PO BOX 3398, LANCASTER, CA 93586-3398
PO BOX 3399, LANCASTER, CA 93586-3399
PO BOX 3400, LANCASTER, CA 93586-3400
PO BOX 3401, LANCASTER, CA 93586-3401
PO BOX 3402, LANCASTER, CA 93586-3402
PO BOX 3403, LANCASTER, CA 93586-3403
PO BOX 3404, LANCASTER, CA 93586-3404
PO BOX 3405, LANCASTER, CA 93586-3405
PO BOX 3406, LANCASTER, CA 93586-3406
PO BOX 3407, LANCASTER, CA 93586-3407
PO BOX 3408, LANCASTER, CA 93586-3408
PO BOX 3409, LANCASTER, CA 93586-3409
PO BOX 3410, LANCASTER, CA 93586-3410
PO BOX 3411, LANCASTER, CA 93586-3411
PO BOX 3412, LANCASTER, CA 93586-3412
PO BOX 3413, LANCASTER, CA 93586-3413
PO BOX 3414, LANCASTER, CA 93586-3414
PO BOX 3415, LANCASTER, CA 93586-3415
PO BOX 3416, LANCASTER, CA 93586-3416
PO BOX 3417, LANCASTER, CA 93586-3417
PO BOX 3418, LANCASTER, CA 93586-3418
PO BOX 3419, LANCASTER, CA 93586-3419
PO BOX 3420, LANCASTER, CA 93586-3420
PO BOX 3421, LANCASTER, CA 93586-3421
PO BOX 3422, LANCASTER, CA 93586-3422
PO BOX 3423, LANCASTER, CA 93586-3423
PO BOX 3424, LANCASTER, CA 93586-3424
PO BOX 3425, LANCASTER, CA 93586-3425
PO BOX 3426, LANCASTER, CA 93586-3426
PO BOX 3427, LANCASTER, CA 93586-3427
PO BOX 3428, LANCASTER, CA 93586-3428
PO BOX 3429, LANCASTER, CA 93586-3429
PO BOX 3430, LANCASTER, CA 93586-3430
PO BOX 3431, LANCASTER, CA 93586-3431
PO BOX 3432, LANCASTER, CA 93586-3432
PO BOX 3433, LANCASTER, CA 93586-3433
PO BOX 3434, LANCASTER, CA 93586-3434
PO BOX 3435, LANCASTER, CA 93586-3435
PO BOX 3436, LANCASTER, CA 93586-3436
PO BOX 3437, LANCASTER, CA 93586-3437
PO BOX 3438, LANCASTER, CA 93586-3438
PO BOX 3439, LANCASTER, CA 93586-3439
PO BOX 3440, LANCASTER, CA 93586-3440
PO BOX 3441, LANCASTER, CA 93586-3441
PO BOX 3442, LANCASTER, CA 93586-3442
PO BOX 3443, LANCASTER, CA 93586-3443
PO BOX 3444, LANCASTER, CA 93586-3444
PO BOX 3445, LANCASTER, CA 93586-3445
PO BOX 3446, LANCASTER, CA 93586-3446
PO BOX 3447, LANCASTER, CA 93586-3447
PO BOX 3448, LANCASTER, CA 93586-3448
PO BOX 3449, LANCASTER, CA 93586-3449
PO BOX 3450, LANCASTER, CA 93586-3450
PO BOX 3451, LANCASTER, CA 93586-3451
PO BOX 3452, LANCASTER, CA 93586-3452
PO BOX 3453, LANCASTER, CA 93586-3453
PO BOX 3454, LANCASTER, CA 93586-3454
PO BOX 3455, LANCASTER, CA 93586-3455
PO BOX 3456, LANCASTER, CA 93586-3456
PO BOX 3457, LANCASTER, CA 93586-3457
PO BOX 3458, LANCASTER, CA 93586-3458
PO BOX 3459, LANCASTER, CA 93586-3459
PO BOX 3460, LANCASTER, CA 93586-3460
PO BOX 3461, LANCASTER, CA 93586-3461
PO BOX 3462, LANCASTER, CA 93586-3462
PO BOX 3463, LANCASTER, CA 93586-3463
PO BOX 3464, LANCASTER, CA 93586-3464
PO BOX 3465, LANCASTER, CA 93586-3465
PO BOX 3466, LANCASTER, CA 93586-3466
PO BOX 3467, LANCASTER, CA 93586-3467
PO BOX 3468, LANCASTER, CA 93586-3468
PO BOX 3469, LANCASTER, CA 93586-3469
PO BOX 3470, LANCASTER, CA 93586-3470
PO BOX 3471, LANCASTER, CA 93586-3471
PO BOX 3472, LANCASTER, CA 93586-3472
PO BOX 3473, LANCASTER, CA 93586-3473
PO BOX 3474, LANCASTER, CA 93586-3474
PO BOX 3475, LANCASTER, CA 93586-3475
PO BOX 3476, LANCASTER, CA 93586-3476
PO BOX 3477, LANCASTER, CA 93586-3477
PO BOX 3478, LANCASTER, CA 93586-3478
PO BOX 3479, LANCASTER, CA 93586-3479
PO BOX 3480, LANCASTER, CA 93586-3480
PO BOX 3481, LANCASTER, CA 93586-3481
PO BOX 3482, LANCASTER, CA 93586-3482
PO BOX 3483, LANCASTER, CA 93586-3483
PO BOX 3484, LANCASTER, CA 93586-3484
PO BOX 3485, LANCASTER, CA 93586-3485
PO BOX 3486, LANCASTER, CA 93586-3486
PO BOX 3487, LANCASTER, CA 93586-3487
PO BOX 3488, LANCASTER, CA 93586-3488
PO BOX 3489, LANCASTER, CA 93586-3489
PO BOX 3490, LANCASTER, CA 93586-3490
PO BOX 3491, LANCASTER, CA 93586-3491
PO BOX 3492, LANCASTER, CA 93586-3492
PO BOX 3493, LANCASTER, CA 93586-3493
PO BOX 3494, LANCASTER, CA 93586-3494
PO BOX 3495, LANCASTER, CA 93586-3495
PO BOX 3496, LANCASTER, CA 93586-3496
PO BOX 3497, LANCASTER, CA 93586-3497
PO BOX 3498, LANCASTER, CA 93586-3498
PO BOX 3499, LANCASTER, CA 93586-3499
PO BOX 3500, LANCASTER, CA 93586-3500
PO BOX 3501, LANCASTER, CA 93586-3501
PO BOX 3502, LANCASTER, CA 93586-3502
PO BOX 3503, LANCASTER, CA 93586-3503
PO BOX 3504, LANCASTER, CA 93586-3504
PO BOX 3505, LANCASTER, CA 93586-3505
PO BOX 3506, LANCASTER, CA 93586-3506
PO BOX 3507, LANCASTER, CA 93586-3507
PO BOX 3508, LANCASTER, CA 93586-3508
PO BOX 3509, LANCASTER, CA 93586-3509
PO BOX 3510, LANCASTER, CA 93586-3510
PO BOX 3511, LANCASTER, CA 93586-3511
PO BOX 3512, LANCASTER, CA 93586-3512
PO BOX 3513, LANCASTER, CA 93586-3513
PO BOX 3514, LANCASTER, CA 93586-3514
PO BOX 3515, LANCASTER, CA 93586-3515
PO BOX 3516, LANCASTER, CA 93586-3516
PO BOX 3517, LANCASTER, CA 93586-3517
PO BOX 3518, LANCASTER, CA 93586-3518
PO BOX 3519, LANCASTER, CA 93586-3519
PO BOX 3520, LANCASTER, CA 93586-3520
PO BOX 3521, LANCASTER, CA 93586-3521
PO BOX 3522, LANCASTER, CA 93586-3522
PO BOX 3523, LANCASTER, CA 93586-3523
PO BOX 3524, LANCASTER, CA 93586-3524
PO BOX 3525, LANCASTER, CA 93586-3525
PO BOX 3526, LANCASTER, CA 93586-3526
PO BOX 3527, LANCASTER, CA 93586-3527
PO BOX 3528, LANCASTER, CA 93586-3528
PO BOX 3529, LANCASTER, CA 93586-3529
PO BOX 3530, LANCASTER, CA 93586-3530
PO BOX 3531, LANCASTER, CA 93586-3531
PO BOX 3532, LANCASTER, CA 93586-3532
PO BOX 3533, LANCASTER, CA 93586-3533
PO BOX 3534, LANCASTER, CA 93586-3534
PO BOX 3535, LANCASTER, CA 93586-3535
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