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 343255, MILWAUKEE, WI 53234-3255
PO BOX 343256, MILWAUKEE, WI 53234-3256
PO BOX 343257, MILWAUKEE, WI 53234-3257
PO BOX 343258, MILWAUKEE, WI 53234-3258
PO BOX 343259, MILWAUKEE, WI 53234-3259
PO BOX 343260, MILWAUKEE, WI 53234-3260
PO BOX 343261, MILWAUKEE, WI 53234-3261
PO BOX 343262, MILWAUKEE, WI 53234-3262
PO BOX 343263, MILWAUKEE, WI 53234-3263
PO BOX 343264, MILWAUKEE, WI 53234-3264
PO BOX 343265, MILWAUKEE, WI 53234-3265
PO BOX 343266, MILWAUKEE, WI 53234-3266
PO BOX 343267, MILWAUKEE, WI 53234-3267
PO BOX 343268, MILWAUKEE, WI 53234-3268
PO BOX 343269, MILWAUKEE, WI 53234-3269
PO BOX 343270, MILWAUKEE, WI 53234-3270
PO BOX 343271, MILWAUKEE, WI 53234-3271
PO BOX 343272, MILWAUKEE, WI 53234-3272
PO BOX 343273, MILWAUKEE, WI 53234-3273
PO BOX 343274, MILWAUKEE, WI 53234-3274
PO BOX 343275, MILWAUKEE, WI 53234-3275
PO BOX 343276, MILWAUKEE, WI 53234-3276
PO BOX 343277, MILWAUKEE, WI 53234-3277
PO BOX 343278, MILWAUKEE, WI 53234-3278
PO BOX 343279, MILWAUKEE, WI 53234-3279
PO BOX 343280, MILWAUKEE, WI 53234-3280
PO BOX 343281, MILWAUKEE, WI 53234-3281
PO BOX 343282, MILWAUKEE, WI 53234-3282
PO BOX 343283, MILWAUKEE, WI 53234-3283
PO BOX 343284, MILWAUKEE, WI 53234-3284
PO BOX 343285, MILWAUKEE, WI 53234-3285
PO BOX 343286, MILWAUKEE, WI 53234-3286
PO BOX 343287, MILWAUKEE, WI 53234-3287
PO BOX 343288, MILWAUKEE, WI 53234-3288
PO BOX 343289, MILWAUKEE, WI 53234-3289
PO BOX 343290, MILWAUKEE, WI 53234-3290
PO BOX 343291, MILWAUKEE, WI 53234-3291
PO BOX 343292, MILWAUKEE, WI 53234-3292
PO BOX 343293, MILWAUKEE, WI 53234-3293
PO BOX 343294, MILWAUKEE, WI 53234-3294
PO BOX 343295, MILWAUKEE, WI 53234-3295
PO BOX 343296, MILWAUKEE, WI 53234-3296
PO BOX 343297, MILWAUKEE, WI 53234-3297
PO BOX 343298, MILWAUKEE, WI 53234-3298
PO BOX 343299, MILWAUKEE, WI 53234-3299
PO BOX 343300, MILWAUKEE, WI 53234-3300
PO BOX 343301, MILWAUKEE, WI 53234-3301
PO BOX 343302, MILWAUKEE, WI 53234-3302
PO BOX 343303, MILWAUKEE, WI 53234-3303
PO BOX 343304, MILWAUKEE, WI 53234-3304
PO BOX 343305, MILWAUKEE, WI 53234-3305
PO BOX 343306, MILWAUKEE, WI 53234-3306
PO BOX 343307, MILWAUKEE, WI 53234-3307
PO BOX 343308, MILWAUKEE, WI 53234-3308
PO BOX 343309, MILWAUKEE, WI 53234-3309
PO BOX 343310, MILWAUKEE, WI 53234-3310
PO BOX 343311, MILWAUKEE, WI 53234-3311
PO BOX 343312, MILWAUKEE, WI 53234-3312
PO BOX 343313, MILWAUKEE, WI 53234-3313
PO BOX 343314, MILWAUKEE, WI 53234-3314
PO BOX 343315, MILWAUKEE, WI 53234-3315
PO BOX 343316, MILWAUKEE, WI 53234-3316
PO BOX 343317, MILWAUKEE, WI 53234-3317
PO BOX 343318, MILWAUKEE, WI 53234-3318
PO BOX 343319, MILWAUKEE, WI 53234-3319
PO BOX 343320, MILWAUKEE, WI 53234-3320
PO BOX 343321, MILWAUKEE, WI 53234-3321
PO BOX 343322, MILWAUKEE, WI 53234-3322
PO BOX 343323, MILWAUKEE, WI 53234-3323
PO BOX 343324, MILWAUKEE, WI 53234-3324
PO BOX 343325, MILWAUKEE, WI 53234-3325
PO BOX 343326, MILWAUKEE, WI 53234-3326
PO BOX 343327, MILWAUKEE, WI 53234-3327
PO BOX 343328, MILWAUKEE, WI 53234-3328
PO BOX 343329, MILWAUKEE, WI 53234-3329
PO BOX 343330, MILWAUKEE, WI 53234-3330
PO BOX 343331, MILWAUKEE, WI 53234-3331
PO BOX 343332, MILWAUKEE, WI 53234-3332
PO BOX 343333, MILWAUKEE, WI 53234-3333
PO BOX 343334, MILWAUKEE, WI 53234-3334
PO BOX 343335, MILWAUKEE, WI 53234-3335
PO BOX 343336, MILWAUKEE, WI 53234-3336
PO BOX 343337, MILWAUKEE, WI 53234-3337
PO BOX 343338, MILWAUKEE, WI 53234-3338
PO BOX 343339, MILWAUKEE, WI 53234-3339
PO BOX 343340, MILWAUKEE, WI 53234-3340
PO BOX 343341, MILWAUKEE, WI 53234-3341
PO BOX 343342, MILWAUKEE, WI 53234-3342
PO BOX 343343, MILWAUKEE, WI 53234-3343
PO BOX 343344, MILWAUKEE, WI 53234-3344
PO BOX 343345, MILWAUKEE, WI 53234-3345
PO BOX 343346, MILWAUKEE, WI 53234-3346
PO BOX 343347, MILWAUKEE, WI 53234-3347
PO BOX 343348, MILWAUKEE, WI 53234-3348
PO BOX 343349, MILWAUKEE, WI 53234-3349
PO BOX 343350, MILWAUKEE, WI 53234-3350
PO BOX 343351, MILWAUKEE, WI 53234-3351
PO BOX 343352, MILWAUKEE, WI 53234-3352
PO BOX 343353, MILWAUKEE, WI 53234-3353
PO BOX 343354, MILWAUKEE, WI 53234-3354
PO BOX 343355, MILWAUKEE, WI 53234-3355
PO BOX 343356, MILWAUKEE, WI 53234-3356
PO BOX 343357, MILWAUKEE, WI 53234-3357
PO BOX 343358, MILWAUKEE, WI 53234-3358
PO BOX 343359, MILWAUKEE, WI 53234-3359
PO BOX 343360, MILWAUKEE, WI 53234-3360
PO BOX 343361, MILWAUKEE, WI 53234-3361
PO BOX 343362, MILWAUKEE, WI 53234-3362
PO BOX 343363, MILWAUKEE, WI 53234-3363
PO BOX 343364, MILWAUKEE, WI 53234-3364
PO BOX 343365, MILWAUKEE, WI 53234-3365
PO BOX 343366, MILWAUKEE, WI 53234-3366
PO BOX 343367, MILWAUKEE, WI 53234-3367
PO BOX 343368, MILWAUKEE, WI 53234-3368
PO BOX 343369, MILWAUKEE, WI 53234-3369
PO BOX 343370, MILWAUKEE, WI 53234-3370
PO BOX 343371, MILWAUKEE, WI 53234-3371
PO BOX 343372, MILWAUKEE, WI 53234-3372
PO BOX 343373, MILWAUKEE, WI 53234-3373
PO BOX 343374, MILWAUKEE, WI 53234-3374
PO BOX 343375, MILWAUKEE, WI 53234-3375
PO BOX 343376, MILWAUKEE, WI 53234-3376
PO BOX 343377, MILWAUKEE, WI 53234-3377
PO BOX 343378, MILWAUKEE, WI 53234-3378
PO BOX 343379, MILWAUKEE, WI 53234-3379
PO BOX 343380, MILWAUKEE, WI 53234-3380
PO BOX 343381, MILWAUKEE, WI 53234-3381
PO BOX 343382, MILWAUKEE, WI 53234-3382
PO BOX 343383, MILWAUKEE, WI 53234-3383
PO BOX 343384, MILWAUKEE, WI 53234-3384
PO BOX 343385, MILWAUKEE, WI 53234-3385
PO BOX 343386, MILWAUKEE, WI 53234-3386
PO BOX 343387, MILWAUKEE, WI 53234-3387
PO BOX 343388, MILWAUKEE, WI 53234-3388
PO BOX 343389, MILWAUKEE, WI 53234-3389
PO BOX 343390, MILWAUKEE, WI 53234-3390
PO BOX 343391, MILWAUKEE, WI 53234-3391
PO BOX 343392, MILWAUKEE, WI 53234-3392
PO BOX 343393, MILWAUKEE, WI 53234-3393
PO BOX 343394, MILWAUKEE, WI 53234-3394
PO BOX 343395, MILWAUKEE, WI 53234-3395
PO BOX 343396, MILWAUKEE, WI 53234-3396
PO BOX 343397, MILWAUKEE, WI 53234-3397
PO BOX 343398, MILWAUKEE, WI 53234-3398
PO BOX 343399, MILWAUKEE, WI 53234-3399
PO BOX 343400, MILWAUKEE, WI 53234-3400
PO BOX 343401, MILWAUKEE, WI 53234-3401
PO BOX 343402, MILWAUKEE, WI 53234-3402
PO BOX 343403, MILWAUKEE, WI 53234-3403
PO BOX 343404, MILWAUKEE, WI 53234-3404
PO BOX 343405, MILWAUKEE, WI 53234-3405
PO BOX 343406, MILWAUKEE, WI 53234-3406
PO BOX 343407, MILWAUKEE, WI 53234-3407
PO BOX 343408, MILWAUKEE, WI 53234-3408
PO BOX 343409, MILWAUKEE, WI 53234-3409
PO BOX 343410, MILWAUKEE, WI 53234-3410
PO BOX 343411, MILWAUKEE, WI 53234-3411
PO BOX 343412, MILWAUKEE, WI 53234-3412
PO BOX 343413, MILWAUKEE, WI 53234-3413
PO BOX 343414, MILWAUKEE, WI 53234-3414
PO BOX 343415, MILWAUKEE, WI 53234-3415
PO BOX 343416, MILWAUKEE, WI 53234-3416
PO BOX 343417, MILWAUKEE, WI 53234-3417
PO BOX 343418, MILWAUKEE, WI 53234-3418
PO BOX 343419, MILWAUKEE, WI 53234-3419
PO BOX 343420, MILWAUKEE, WI 53234-3420
PO BOX 343421, MILWAUKEE, WI 53234-3421
PO BOX 343422, MILWAUKEE, WI 53234-3422
PO BOX 343423, MILWAUKEE, WI 53234-3423
PO BOX 343424, MILWAUKEE, WI 53234-3424
PO BOX 343425, MILWAUKEE, WI 53234-3425
PO BOX 343426, MILWAUKEE, WI 53234-3426
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