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 88393, MILWAUKEE, WI 53288-8393
PO BOX 88394, MILWAUKEE, WI 53288-8394
PO BOX 88395, MILWAUKEE, WI 53288-8395
PO BOX 88396, MILWAUKEE, WI 53288-8396
PO BOX 88397, MILWAUKEE, WI 53288-8397
PO BOX 88398, MILWAUKEE, WI 53288-8398
PO BOX 88399, MILWAUKEE, WI 53288-8399
PO BOX 88400, MILWAUKEE, WI 53288-8400
PO BOX 88401, MILWAUKEE, WI 53288-8401
PO BOX 88402, MILWAUKEE, WI 53288-8402
PO BOX 88403, MILWAUKEE, WI 53288-8403
PO BOX 88404, MILWAUKEE, WI 53288-8404
PO BOX 88405, MILWAUKEE, WI 53288-8405
PO BOX 88406, MILWAUKEE, WI 53288-8406
PO BOX 88407, MILWAUKEE, WI 53288-8407
PO BOX 88408, MILWAUKEE, WI 53288-8408
PO BOX 88409, MILWAUKEE, WI 53288-8409
PO BOX 88410, MILWAUKEE, WI 53288-8410
PO BOX 88411, MILWAUKEE, WI 53288-8411
PO BOX 88412, MILWAUKEE, WI 53288-8412
PO BOX 88413, MILWAUKEE, WI 53288-8413
PO BOX 88414, MILWAUKEE, WI 53288-8414
PO BOX 88415, MILWAUKEE, WI 53288-8415
PO BOX 88416, MILWAUKEE, WI 53288-8416
PO BOX 88417, MILWAUKEE, WI 53288-8417
PO BOX 88418, MILWAUKEE, WI 53288-8418
PO BOX 88419, MILWAUKEE, WI 53288-8419
PO BOX 88420, MILWAUKEE, WI 53288-8420
PO BOX 88421, MILWAUKEE, WI 53288-8421
PO BOX 88422, MILWAUKEE, WI 53288-8422
PO BOX 88423, MILWAUKEE, WI 53288-8423
PO BOX 88424, MILWAUKEE, WI 53288-8424
PO BOX 88425, MILWAUKEE, WI 53288-8425
PO BOX 88426, MILWAUKEE, WI 53288-8426
PO BOX 88427, MILWAUKEE, WI 53288-8427
PO BOX 88428, MILWAUKEE, WI 53288-8428
PO BOX 88429, MILWAUKEE, WI 53288-8429
PO BOX 88430, MILWAUKEE, WI 53288-8430
PO BOX 88431, MILWAUKEE, WI 53288-8431
PO BOX 88432, MILWAUKEE, WI 53288-8432
PO BOX 88433, MILWAUKEE, WI 53288-8433
PO BOX 88434, MILWAUKEE, WI 53288-8434
PO BOX 88435, MILWAUKEE, WI 53288-8435
PO BOX 88436, MILWAUKEE, WI 53288-8436
PO BOX 88437, MILWAUKEE, WI 53288-8437
PO BOX 88438, MILWAUKEE, WI 53288-8438
PO BOX 88439, MILWAUKEE, WI 53288-8439
PO BOX 88440, MILWAUKEE, WI 53288-8440
PO BOX 88441, MILWAUKEE, WI 53288-8441
PO BOX 88442, MILWAUKEE, WI 53288-8442
PO BOX 88443, MILWAUKEE, WI 53288-8443
PO BOX 88444, MILWAUKEE, WI 53288-8444
PO BOX 88445, MILWAUKEE, WI 53288-8445
PO BOX 88446, MILWAUKEE, WI 53288-8446
PO BOX 88447, MILWAUKEE, WI 53288-8447
PO BOX 88448, MILWAUKEE, WI 53288-8448
PO BOX 88449, MILWAUKEE, WI 53288-8449
PO BOX 88450, MILWAUKEE, WI 53288-8450
PO BOX 88451, MILWAUKEE, WI 53288-8451
PO BOX 88452, MILWAUKEE, WI 53288-8452
PO BOX 88453, MILWAUKEE, WI 53288-8453
PO BOX 88454, MILWAUKEE, WI 53288-8454
PO BOX 88455, MILWAUKEE, WI 53288-8455
PO BOX 88456, MILWAUKEE, WI 53288-8456
PO BOX 88457, MILWAUKEE, WI 53288-8457
PO BOX 88458, MILWAUKEE, WI 53288-8458
PO BOX 88459, MILWAUKEE, WI 53288-8459
PO BOX 88460, MILWAUKEE, WI 53288-8460
PO BOX 88461, MILWAUKEE, WI 53288-8461
PO BOX 88462, MILWAUKEE, WI 53288-8462
PO BOX 88463, MILWAUKEE, WI 53288-8463
PO BOX 88464, MILWAUKEE, WI 53288-8464
PO BOX 88465, MILWAUKEE, WI 53288-8465
PO BOX 88466, MILWAUKEE, WI 53288-8466
PO BOX 88467, MILWAUKEE, WI 53288-8467
PO BOX 88468, MILWAUKEE, WI 53288-8468
PO BOX 88469, MILWAUKEE, WI 53288-8469
PO BOX 88470, MILWAUKEE, WI 53288-8470
PO BOX 88471, MILWAUKEE, WI 53288-8471
PO BOX 88472, MILWAUKEE, WI 53288-8472
PO BOX 88473, MILWAUKEE, WI 53288-8473
PO BOX 88474, MILWAUKEE, WI 53288-8474
PO BOX 88475, MILWAUKEE, WI 53288-8475
PO BOX 88476, MILWAUKEE, WI 53288-8476
PO BOX 88477, MILWAUKEE, WI 53288-8477
PO BOX 88478, MILWAUKEE, WI 53288-8478
PO BOX 88479, MILWAUKEE, WI 53288-8479
PO BOX 88480, MILWAUKEE, WI 53288-8480
PO BOX 88481, MILWAUKEE, WI 53288-8481
PO BOX 88482, MILWAUKEE, WI 53288-8482
PO BOX 88483, MILWAUKEE, WI 53288-8483
PO BOX 88484, MILWAUKEE, WI 53288-8484
PO BOX 88485, MILWAUKEE, WI 53288-8485
PO BOX 88486, MILWAUKEE, WI 53288-8486
PO BOX 88487, MILWAUKEE, WI 53288-8487
PO BOX 88488, MILWAUKEE, WI 53288-8488
PO BOX 88489, MILWAUKEE, WI 53288-8489
PO BOX 88490, MILWAUKEE, WI 53288-8490
PO BOX 88491, MILWAUKEE, WI 53288-8491
PO BOX 88492, MILWAUKEE, WI 53288-8492
PO BOX 88493, MILWAUKEE, WI 53288-8493
PO BOX 88494, MILWAUKEE, WI 53288-8494
PO BOX 88495, MILWAUKEE, WI 53288-8495
PO BOX 88496, MILWAUKEE, WI 53288-8496
PO BOX 88497, MILWAUKEE, WI 53288-8497
PO BOX 88498, MILWAUKEE, WI 53288-8498
PO BOX 88499, MILWAUKEE, WI 53288-8499
PO BOX 88500, MILWAUKEE, WI 53288-8500
PO BOX 88501, MILWAUKEE, WI 53288-8501
PO BOX 88502, MILWAUKEE, WI 53288-8502
PO BOX 88503, MILWAUKEE, WI 53288-8503
PO BOX 88504, MILWAUKEE, WI 53288-8504
PO BOX 88505, MILWAUKEE, WI 53288-8505
PO BOX 88506, MILWAUKEE, WI 53288-8506
PO BOX 88507, MILWAUKEE, WI 53288-8507
PO BOX 88508, MILWAUKEE, WI 53288-8508
PO BOX 88509, MILWAUKEE, WI 53288-8509
PO BOX 88510, MILWAUKEE, WI 53288-8510
PO BOX 88511, MILWAUKEE, WI 53288-8511
PO BOX 88512, MILWAUKEE, WI 53288-8512
PO BOX 88513, MILWAUKEE, WI 53288-8513
PO BOX 88514, MILWAUKEE, WI 53288-8514
PO BOX 88515, MILWAUKEE, WI 53288-8515
PO BOX 88516, MILWAUKEE, WI 53288-8516
PO BOX 88517, MILWAUKEE, WI 53288-8517
PO BOX 88518, MILWAUKEE, WI 53288-8518
PO BOX 88519, MILWAUKEE, WI 53288-8519
PO BOX 88520, MILWAUKEE, WI 53288-8520
PO BOX 88521, MILWAUKEE, WI 53288-8521
PO BOX 88522, MILWAUKEE, WI 53288-8522
PO BOX 88523, MILWAUKEE, WI 53288-8523
PO BOX 88524, MILWAUKEE, WI 53288-8524
PO BOX 88525, MILWAUKEE, WI 53288-8525
PO BOX 88526, MILWAUKEE, WI 53288-8526
PO BOX 88527, MILWAUKEE, WI 53288-8527
PO BOX 88528, MILWAUKEE, WI 53288-8528
PO BOX 88529, MILWAUKEE, WI 53288-8529
PO BOX 88530, MILWAUKEE, WI 53288-8530
PO BOX 88531, MILWAUKEE, WI 53288-8531
PO BOX 88532, MILWAUKEE, WI 53288-8532
PO BOX 88533, MILWAUKEE, WI 53288-8533
PO BOX 88534, MILWAUKEE, WI 53288-8534
PO BOX 88535, MILWAUKEE, WI 53288-8535
PO BOX 88536, MILWAUKEE, WI 53288-8536
PO BOX 88537, MILWAUKEE, WI 53288-8537
PO BOX 88538, MILWAUKEE, WI 53288-8538
PO BOX 88539, MILWAUKEE, WI 53288-8539
PO BOX 88540, MILWAUKEE, WI 53288-8540
PO BOX 88541, MILWAUKEE, WI 53288-8541
PO BOX 88542, MILWAUKEE, WI 53288-8542
PO BOX 88543, MILWAUKEE, WI 53288-8543
PO BOX 88544, MILWAUKEE, WI 53288-8544
PO BOX 88545, MILWAUKEE, WI 53288-8545
PO BOX 88546, MILWAUKEE, WI 53288-8546
PO BOX 88547, MILWAUKEE, WI 53288-8547
PO BOX 88548, MILWAUKEE, WI 53288-8548
PO BOX 88549, MILWAUKEE, WI 53288-8549
PO BOX 88550, MILWAUKEE, WI 53288-8550
PO BOX 88551, MILWAUKEE, WI 53288-8551
PO BOX 88552, MILWAUKEE, WI 53288-8552
PO BOX 88553, MILWAUKEE, WI 53288-8553
PO BOX 88554, MILWAUKEE, WI 53288-8554
PO BOX 88555, MILWAUKEE, WI 53288-8555
PO BOX 88556, MILWAUKEE, WI 53288-8556
PO BOX 88557, MILWAUKEE, WI 53288-8557
PO BOX 88558, MILWAUKEE, WI 53288-8558
PO BOX 88559, MILWAUKEE, WI 53288-8559
PO BOX 88560, MILWAUKEE, WI 53288-8560
PO BOX 88561, MILWAUKEE, WI 53288-8561
PO BOX 88562, MILWAUKEE, WI 53288-8562
PO BOX 88563, MILWAUKEE, WI 53288-8563
PO BOX 88564, MILWAUKEE, WI 53288-8564
PO BOX 88565, MILWAUKEE, WI 53288-8565
PO BOX 88566, MILWAUKEE, WI 53288-8566
PO BOX 88567, MILWAUKEE, WI 53288-8567
PO BOX 88568, MILWAUKEE, WI 53288-8568
PO BOX 88569, MILWAUKEE, WI 53288-8569
PO BOX 88570, MILWAUKEE, WI 53288-8570
PO BOX 88571, MILWAUKEE, WI 53288-8571
PO BOX 88572, MILWAUKEE, WI 53288-8572
PO BOX 88573, MILWAUKEE, WI 53288-8573
PO BOX 88574, MILWAUKEE, WI 53288-8574
PO BOX 88575, MILWAUKEE, WI 53288-8575
PO BOX 88576, MILWAUKEE, WI 53288-8576
PO BOX 88577, MILWAUKEE, WI 53288-8577
PO BOX 88578, MILWAUKEE, WI 53288-8578
PO BOX 88579, MILWAUKEE, WI 53288-8579
PO BOX 88580, MILWAUKEE, WI 53288-8580
PO BOX 88581, MILWAUKEE, WI 53288-8581
PO BOX 88582, MILWAUKEE, WI 53288-8582
PO BOX 88583, MILWAUKEE, WI 53288-8583
PO BOX 88584, MILWAUKEE, WI 53288-8584
PO BOX 88585, MILWAUKEE, WI 53288-8585
PO BOX 88586, MILWAUKEE, WI 53288-8586
PO BOX 88587, MILWAUKEE, WI 53288-8587
PO BOX 88588, MILWAUKEE, WI 53288-8588
PO BOX 88589, MILWAUKEE, WI 53288-8589
PO BOX 88590, MILWAUKEE, WI 53288-8590
PO BOX 88591, MILWAUKEE, WI 53288-8591
PO BOX 88592, MILWAUKEE, WI 53288-8592
PO BOX 88593, MILWAUKEE, WI 53288-8593