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 78273, MILWAUKEE, WI 53278-8273
PO BOX 78274, MILWAUKEE, WI 53278-8274
PO BOX 78275, MILWAUKEE, WI 53278-8275
PO BOX 78276, MILWAUKEE, WI 53278-8276
PO BOX 78277, MILWAUKEE, WI 53278-8277
PO BOX 78278, MILWAUKEE, WI 53278-8278
PO BOX 78279, MILWAUKEE, WI 53278-8279
PO BOX 78280, MILWAUKEE, WI 53278-8280
PO BOX 78281, MILWAUKEE, WI 53278-8281
PO BOX 78282, MILWAUKEE, WI 53278-8282
PO BOX 78283, MILWAUKEE, WI 53278-8283
PO BOX 78284, MILWAUKEE, WI 53278-8284
PO BOX 78285, MILWAUKEE, WI 53278-8285
PO BOX 78286, MILWAUKEE, WI 53278-8286
PO BOX 78287, MILWAUKEE, WI 53278-8287
PO BOX 78288, MILWAUKEE, WI 53278-8288
PO BOX 78289, MILWAUKEE, WI 53278-8289
PO BOX 78290, MILWAUKEE, WI 53278-8290
PO BOX 78291, MILWAUKEE, WI 53278-8291
PO BOX 78292, MILWAUKEE, WI 53278-8292
PO BOX 78293, MILWAUKEE, WI 53278-8293
PO BOX 78294, MILWAUKEE, WI 53278-8294
PO BOX 78295, MILWAUKEE, WI 53278-8295
PO BOX 78296, MILWAUKEE, WI 53278-8296
PO BOX 78297, MILWAUKEE, WI 53278-8297
PO BOX 78298, MILWAUKEE, WI 53278-8298
PO BOX 78299, MILWAUKEE, WI 53278-8299
PO BOX 78300, MILWAUKEE, WI 53278-8300
PO BOX 78301, MILWAUKEE, WI 53278-8301
PO BOX 78302, MILWAUKEE, WI 53278-8302
PO BOX 78303, MILWAUKEE, WI 53278-8303
PO BOX 78304, MILWAUKEE, WI 53278-8304
PO BOX 78305, MILWAUKEE, WI 53278-8305
PO BOX 78306, MILWAUKEE, WI 53278-8306
PO BOX 78307, MILWAUKEE, WI 53278-8307
PO BOX 78308, MILWAUKEE, WI 53278-8308
PO BOX 78309, MILWAUKEE, WI 53278-8309
PO BOX 78310, MILWAUKEE, WI 53278-8310
PO BOX 78311, MILWAUKEE, WI 53278-8311
PO BOX 78312, MILWAUKEE, WI 53278-8312
PO BOX 78313, MILWAUKEE, WI 53278-8313
PO BOX 78314, MILWAUKEE, WI 53278-8314
PO BOX 78315, MILWAUKEE, WI 53278-8315
PO BOX 78316, MILWAUKEE, WI 53278-8316
PO BOX 78317, MILWAUKEE, WI 53278-8317
PO BOX 78318, MILWAUKEE, WI 53278-8318
PO BOX 78319, MILWAUKEE, WI 53278-8319
PO BOX 78320, MILWAUKEE, WI 53278-8320
PO BOX 78321, MILWAUKEE, WI 53278-8321
PO BOX 78322, MILWAUKEE, WI 53278-8322
PO BOX 78323, MILWAUKEE, WI 53278-8323
PO BOX 78324, MILWAUKEE, WI 53278-8324
PO BOX 78325, MILWAUKEE, WI 53278-8325
PO BOX 78326, MILWAUKEE, WI 53278-8326
PO BOX 78327, MILWAUKEE, WI 53278-8327
PO BOX 78328, MILWAUKEE, WI 53278-8328
PO BOX 78329, MILWAUKEE, WI 53278-8329
PO BOX 78330, MILWAUKEE, WI 53278-8330
PO BOX 78331, MILWAUKEE, WI 53278-8331
PO BOX 78332, MILWAUKEE, WI 53278-8332
PO BOX 78333, MILWAUKEE, WI 53278-8333
PO BOX 78334, MILWAUKEE, WI 53278-8334
PO BOX 78335, MILWAUKEE, WI 53278-8335
PO BOX 78336, MILWAUKEE, WI 53278-8336
PO BOX 78337, MILWAUKEE, WI 53278-8337
PO BOX 78338, MILWAUKEE, WI 53278-8338
PO BOX 78339, MILWAUKEE, WI 53278-8339
PO BOX 78340, MILWAUKEE, WI 53278-8340
PO BOX 78341, MILWAUKEE, WI 53278-8341
PO BOX 78342, MILWAUKEE, WI 53278-8342
PO BOX 78343, MILWAUKEE, WI 53278-8343
PO BOX 78344, MILWAUKEE, WI 53278-8344
PO BOX 78345, MILWAUKEE, WI 53278-8345
PO BOX 78346, MILWAUKEE, WI 53278-8346
PO BOX 78347, MILWAUKEE, WI 53278-8347
PO BOX 78348, MILWAUKEE, WI 53278-8348
PO BOX 78349, MILWAUKEE, WI 53278-8349
PO BOX 78350, MILWAUKEE, WI 53278-8350
PO BOX 78351, MILWAUKEE, WI 53278-8351
PO BOX 78352, MILWAUKEE, WI 53278-8352
PO BOX 78353, MILWAUKEE, WI 53278-8353
PO BOX 78354, MILWAUKEE, WI 53278-8354
PO BOX 78355, MILWAUKEE, WI 53278-8355
PO BOX 78356, MILWAUKEE, WI 53278-8356
PO BOX 78357, MILWAUKEE, WI 53278-8357
PO BOX 78358, MILWAUKEE, WI 53278-8358
PO BOX 78359, MILWAUKEE, WI 53278-8359
PO BOX 78360, MILWAUKEE, WI 53278-8360
PO BOX 78361, MILWAUKEE, WI 53278-8361
PO BOX 78362, MILWAUKEE, WI 53278-8362
PO BOX 78363, MILWAUKEE, WI 53278-8363
PO BOX 78364, MILWAUKEE, WI 53278-8364
PO BOX 78365, MILWAUKEE, WI 53278-8365
PO BOX 78366, MILWAUKEE, WI 53278-8366
PO BOX 78367, MILWAUKEE, WI 53278-8367
PO BOX 78368, MILWAUKEE, WI 53278-8368
PO BOX 78369, MILWAUKEE, WI 53278-8369
PO BOX 78370, MILWAUKEE, WI 53278-8370
PO BOX 78371, MILWAUKEE, WI 53278-8371
PO BOX 78372, MILWAUKEE, WI 53278-8372
PO BOX 78373, MILWAUKEE, WI 53278-8373
PO BOX 78374, MILWAUKEE, WI 53278-8374
PO BOX 78375, MILWAUKEE, WI 53278-8375
PO BOX 78376, MILWAUKEE, WI 53278-8376
PO BOX 78377, MILWAUKEE, WI 53278-8377
PO BOX 78378, MILWAUKEE, WI 53278-8378
PO BOX 78379, MILWAUKEE, WI 53278-8379
PO BOX 78380, MILWAUKEE, WI 53278-8380
PO BOX 78381, MILWAUKEE, WI 53278-8381
PO BOX 78382, MILWAUKEE, WI 53278-8382
PO BOX 78383, MILWAUKEE, WI 53278-8383
PO BOX 78384, MILWAUKEE, WI 53278-8384
PO BOX 78385, MILWAUKEE, WI 53278-8385
PO BOX 78386, MILWAUKEE, WI 53278-8386
PO BOX 78387, MILWAUKEE, WI 53278-8387
PO BOX 78388, MILWAUKEE, WI 53278-8388
PO BOX 78389, MILWAUKEE, WI 53278-8389
PO BOX 78390, MILWAUKEE, WI 53278-8390
PO BOX 78391, MILWAUKEE, WI 53278-8391
PO BOX 78392, MILWAUKEE, WI 53278-8392
PO BOX 78393, MILWAUKEE, WI 53278-8393
PO BOX 78394, MILWAUKEE, WI 53278-8394
PO BOX 78395, MILWAUKEE, WI 53278-8395
PO BOX 78396, MILWAUKEE, WI 53278-8396
PO BOX 78397, MILWAUKEE, WI 53278-8397
PO BOX 78398, MILWAUKEE, WI 53278-8398
PO BOX 78399, MILWAUKEE, WI 53278-8399
PO BOX 78400, MILWAUKEE, WI 53278-8400
PO BOX 78401, MILWAUKEE, WI 53278-8401
PO BOX 78402, MILWAUKEE, WI 53278-8402
PO BOX 78403, MILWAUKEE, WI 53278-8403
PO BOX 78404, MILWAUKEE, WI 53278-8404
PO BOX 78405, MILWAUKEE, WI 53278-8405
PO BOX 78406, MILWAUKEE, WI 53278-8406
PO BOX 78407, MILWAUKEE, WI 53278-8407
PO BOX 78408, MILWAUKEE, WI 53278-8408
PO BOX 78409, MILWAUKEE, WI 53278-8409
PO BOX 78410, MILWAUKEE, WI 53278-8410
PO BOX 78411, MILWAUKEE, WI 53278-8411
PO BOX 78412, MILWAUKEE, WI 53278-8412
PO BOX 78413, MILWAUKEE, WI 53278-8413
PO BOX 78414, MILWAUKEE, WI 53278-8414
PO BOX 78415, MILWAUKEE, WI 53278-8415
PO BOX 78416, MILWAUKEE, WI 53278-8416
PO BOX 78417, MILWAUKEE, WI 53278-8417
PO BOX 78418, MILWAUKEE, WI 53278-8418
PO BOX 78419, MILWAUKEE, WI 53278-8419
PO BOX 78420, MILWAUKEE, WI 53278-8420
PO BOX 78421, MILWAUKEE, WI 53278-8421
PO BOX 78422, MILWAUKEE, WI 53278-8422
PO BOX 78423, MILWAUKEE, WI 53278-8423
PO BOX 78424, MILWAUKEE, WI 53278-8424
PO BOX 78425, MILWAUKEE, WI 53278-8425
PO BOX 78426, MILWAUKEE, WI 53278-8426
PO BOX 78427, MILWAUKEE, WI 53278-8427
PO BOX 78428, MILWAUKEE, WI 53278-8428
PO BOX 78429, MILWAUKEE, WI 53278-8429
PO BOX 78430, MILWAUKEE, WI 53278-8430
PO BOX 78431, MILWAUKEE, WI 53278-8431
PO BOX 78432, MILWAUKEE, WI 53278-8432
PO BOX 78433, MILWAUKEE, WI 53278-8433
PO BOX 78434, MILWAUKEE, WI 53278-8434
PO BOX 78435, MILWAUKEE, WI 53278-8435
PO BOX 78436, MILWAUKEE, WI 53278-8436
PO BOX 78437, MILWAUKEE, WI 53278-8437
PO BOX 78438, MILWAUKEE, WI 53278-8438
PO BOX 78439, MILWAUKEE, WI 53278-8439
PO BOX 78440, MILWAUKEE, WI 53278-8440
PO BOX 78441, MILWAUKEE, WI 53278-8441
PO BOX 78442, MILWAUKEE, WI 53278-8442
PO BOX 78443, MILWAUKEE, WI 53278-8443
PO BOX 78444, MILWAUKEE, WI 53278-8444
PO BOX 78445, MILWAUKEE, WI 53278-8445
PO BOX 78446, MILWAUKEE, WI 53278-8446
PO BOX 78447, MILWAUKEE, WI 53278-8447
PO BOX 78448, MILWAUKEE, WI 53278-8448
PO BOX 78449, MILWAUKEE, WI 53278-8449
PO BOX 78450, MILWAUKEE, WI 53278-8450
PO BOX 78451, MILWAUKEE, WI 53278-8451
PO BOX 78452, MILWAUKEE, WI 53278-8452
PO BOX 78453, MILWAUKEE, WI 53278-8453
PO BOX 78454, MILWAUKEE, WI 53278-8454
PO BOX 78455, MILWAUKEE, WI 53278-8455
PO BOX 78456, MILWAUKEE, WI 53278-8456
PO BOX 78457, MILWAUKEE, WI 53278-8457
PO BOX 78458, MILWAUKEE, WI 53278-8458
PO BOX 78459, MILWAUKEE, WI 53278-8459
PO BOX 78460, MILWAUKEE, WI 53278-8460
PO BOX 78461, MILWAUKEE, WI 53278-8461
PO BOX 78462, MILWAUKEE, WI 53278-8462
PO BOX 78463, MILWAUKEE, WI 53278-8463
PO BOX 78464, MILWAUKEE, WI 53278-8464
PO BOX 78465, MILWAUKEE, WI 53278-8465
PO BOX 78466, MILWAUKEE, WI 53278-8466
PO BOX 78467, MILWAUKEE, WI 53278-8467
PO BOX 78468, MILWAUKEE, WI 53278-8468
PO BOX 78469, MILWAUKEE, WI 53278-8469
PO BOX 78470, MILWAUKEE, WI 53278-8470
PO BOX 78471, MILWAUKEE, WI 53278-8471
PO BOX 78472, MILWAUKEE, WI 53278-8472
PO BOX 78473, MILWAUKEE, WI 53278-8473