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 88038, MILWAUKEE, WI 53288-8038
PO BOX 88039, MILWAUKEE, WI 53288-8039
PO BOX 88040, MILWAUKEE, WI 53288-8040
PO BOX 88041, MILWAUKEE, WI 53288-8041
PO BOX 88042, MILWAUKEE, WI 53288-8042
PO BOX 88043, MILWAUKEE, WI 53288-8043
PO BOX 88044, MILWAUKEE, WI 53288-8044
PO BOX 88045, MILWAUKEE, WI 53288-8045
PO BOX 88046, MILWAUKEE, WI 53288-8046
PO BOX 88047, MILWAUKEE, WI 53288-8047
PO BOX 88048, MILWAUKEE, WI 53288-8048
PO BOX 88049, MILWAUKEE, WI 53288-8049
PO BOX 88050, MILWAUKEE, WI 53288-8050
PO BOX 88051, MILWAUKEE, WI 53288-8051
PO BOX 88052, MILWAUKEE, WI 53288-8052
PO BOX 88053, MILWAUKEE, WI 53288-8053
PO BOX 88054, MILWAUKEE, WI 53288-8054
PO BOX 88055, MILWAUKEE, WI 53288-8055
PO BOX 88056, MILWAUKEE, WI 53288-8056
PO BOX 88057, MILWAUKEE, WI 53288-8057
PO BOX 88058, MILWAUKEE, WI 53288-8058
PO BOX 88059, MILWAUKEE, WI 53288-8059
PO BOX 88060, MILWAUKEE, WI 53288-8060
PO BOX 88061, MILWAUKEE, WI 53288-8061
PO BOX 88062, MILWAUKEE, WI 53288-8062
PO BOX 88063, MILWAUKEE, WI 53288-8063
PO BOX 88064, MILWAUKEE, WI 53288-8064
PO BOX 88065, MILWAUKEE, WI 53288-8065
PO BOX 88066, MILWAUKEE, WI 53288-8066
PO BOX 88067, MILWAUKEE, WI 53288-8067
PO BOX 88068, MILWAUKEE, WI 53288-8068
PO BOX 88069, MILWAUKEE, WI 53288-8069
PO BOX 88070, MILWAUKEE, WI 53288-8070
PO BOX 88071, MILWAUKEE, WI 53288-8071
PO BOX 88072, MILWAUKEE, WI 53288-8072
PO BOX 88073, MILWAUKEE, WI 53288-8073
PO BOX 88074, MILWAUKEE, WI 53288-8074
PO BOX 88075, MILWAUKEE, WI 53288-8075
PO BOX 88076, MILWAUKEE, WI 53288-8076
PO BOX 88077, MILWAUKEE, WI 53288-8077
PO BOX 88078, MILWAUKEE, WI 53288-8078
PO BOX 88079, MILWAUKEE, WI 53288-8079
PO BOX 88080, MILWAUKEE, WI 53288-8080
PO BOX 88081, MILWAUKEE, WI 53288-8081
PO BOX 88082, MILWAUKEE, WI 53288-8082
PO BOX 88083, MILWAUKEE, WI 53288-8083
PO BOX 88084, MILWAUKEE, WI 53288-8084
PO BOX 88085, MILWAUKEE, WI 53288-8085
PO BOX 88086, MILWAUKEE, WI 53288-8086
PO BOX 88087, MILWAUKEE, WI 53288-8087
PO BOX 88088, MILWAUKEE, WI 53288-8088
PO BOX 88089, MILWAUKEE, WI 53288-8089
PO BOX 88090, MILWAUKEE, WI 53288-8090
PO BOX 88091, MILWAUKEE, WI 53288-8091
PO BOX 88092, MILWAUKEE, WI 53288-8092
PO BOX 88093, MILWAUKEE, WI 53288-8093
PO BOX 88094, MILWAUKEE, WI 53288-8094
PO BOX 88095, MILWAUKEE, WI 53288-8095
PO BOX 88096, MILWAUKEE, WI 53288-8096
PO BOX 88097, MILWAUKEE, WI 53288-8097
PO BOX 88098, MILWAUKEE, WI 53288-8098
PO BOX 88099, MILWAUKEE, WI 53288-8099
PO BOX 88100, MILWAUKEE, WI 53288-8100
PO BOX 88101, MILWAUKEE, WI 53288-8101
PO BOX 88102, MILWAUKEE, WI 53288-8102
PO BOX 88103, MILWAUKEE, WI 53288-8103
PO BOX 88104, MILWAUKEE, WI 53288-8104
PO BOX 88105, MILWAUKEE, WI 53288-8105
PO BOX 88106, MILWAUKEE, WI 53288-8106
PO BOX 88107, MILWAUKEE, WI 53288-8107
PO BOX 88108, MILWAUKEE, WI 53288-8108
PO BOX 88109, MILWAUKEE, WI 53288-8109
PO BOX 88110, MILWAUKEE, WI 53288-8110
PO BOX 88111, MILWAUKEE, WI 53288-8111
PO BOX 88112, MILWAUKEE, WI 53288-8112
PO BOX 88113, MILWAUKEE, WI 53288-8113
PO BOX 88114, MILWAUKEE, WI 53288-8114
PO BOX 88115, MILWAUKEE, WI 53288-8115
PO BOX 88116, MILWAUKEE, WI 53288-8116
PO BOX 88117, MILWAUKEE, WI 53288-8117
PO BOX 88118, MILWAUKEE, WI 53288-8118
PO BOX 88119, MILWAUKEE, WI 53288-8119
PO BOX 88120, MILWAUKEE, WI 53288-8120
PO BOX 88121, MILWAUKEE, WI 53288-8121
PO BOX 88122, MILWAUKEE, WI 53288-8122
PO BOX 88123, MILWAUKEE, WI 53288-8123
PO BOX 88124, MILWAUKEE, WI 53288-8124
PO BOX 88125, MILWAUKEE, WI 53288-8125
PO BOX 88126, MILWAUKEE, WI 53288-8126
PO BOX 88127, MILWAUKEE, WI 53288-8127
PO BOX 88128, MILWAUKEE, WI 53288-8128
PO BOX 88129, MILWAUKEE, WI 53288-8129
PO BOX 88130, MILWAUKEE, WI 53288-8130
PO BOX 88131, MILWAUKEE, WI 53288-8131
PO BOX 88132, MILWAUKEE, WI 53288-8132
PO BOX 88133, MILWAUKEE, WI 53288-8133
PO BOX 88134, MILWAUKEE, WI 53288-8134
PO BOX 88135, MILWAUKEE, WI 53288-8135
PO BOX 88136, MILWAUKEE, WI 53288-8136
PO BOX 88137, MILWAUKEE, WI 53288-8137
PO BOX 88138, MILWAUKEE, WI 53288-8138
PO BOX 88139, MILWAUKEE, WI 53288-8139
PO BOX 88140, MILWAUKEE, WI 53288-8140
PO BOX 88141, MILWAUKEE, WI 53288-8141
PO BOX 88142, MILWAUKEE, WI 53288-8142
PO BOX 88143, MILWAUKEE, WI 53288-8143
PO BOX 88144, MILWAUKEE, WI 53288-8144
PO BOX 88145, MILWAUKEE, WI 53288-8145
PO BOX 88146, MILWAUKEE, WI 53288-8146
PO BOX 88147, MILWAUKEE, WI 53288-8147
PO BOX 88148, MILWAUKEE, WI 53288-8148
PO BOX 88149, MILWAUKEE, WI 53288-8149
PO BOX 88150, MILWAUKEE, WI 53288-8150
PO BOX 88151, MILWAUKEE, WI 53288-8151
PO BOX 88152, MILWAUKEE, WI 53288-8152
PO BOX 88153, MILWAUKEE, WI 53288-8153
PO BOX 88154, MILWAUKEE, WI 53288-8154
PO BOX 88155, MILWAUKEE, WI 53288-8155
PO BOX 88156, MILWAUKEE, WI 53288-8156
PO BOX 88157, MILWAUKEE, WI 53288-8157
PO BOX 88158, MILWAUKEE, WI 53288-8158
PO BOX 88159, MILWAUKEE, WI 53288-8159
PO BOX 88160, MILWAUKEE, WI 53288-8160
PO BOX 88161, MILWAUKEE, WI 53288-8161
PO BOX 88162, MILWAUKEE, WI 53288-8162
PO BOX 88163, MILWAUKEE, WI 53288-8163
PO BOX 88164, MILWAUKEE, WI 53288-8164
PO BOX 88165, MILWAUKEE, WI 53288-8165
PO BOX 88166, MILWAUKEE, WI 53288-8166
PO BOX 88167, MILWAUKEE, WI 53288-8167
PO BOX 88168, MILWAUKEE, WI 53288-8168
PO BOX 88169, MILWAUKEE, WI 53288-8169
PO BOX 88170, MILWAUKEE, WI 53288-8170
PO BOX 88171, MILWAUKEE, WI 53288-8171
PO BOX 88172, MILWAUKEE, WI 53288-8172
PO BOX 88173, MILWAUKEE, WI 53288-8173
PO BOX 88174, MILWAUKEE, WI 53288-8174
PO BOX 88175, MILWAUKEE, WI 53288-8175
PO BOX 88176, MILWAUKEE, WI 53288-8176
PO BOX 88177, MILWAUKEE, WI 53288-8177
PO BOX 88178, MILWAUKEE, WI 53288-8178
PO BOX 88179, MILWAUKEE, WI 53288-8179
PO BOX 88180, MILWAUKEE, WI 53288-8180
PO BOX 88181, MILWAUKEE, WI 53288-8181
PO BOX 88182, MILWAUKEE, WI 53288-8182
PO BOX 88183, MILWAUKEE, WI 53288-8183
PO BOX 88184, MILWAUKEE, WI 53288-8184
PO BOX 88185, MILWAUKEE, WI 53288-8185
PO BOX 88186, MILWAUKEE, WI 53288-8186
PO BOX 88187, MILWAUKEE, WI 53288-8187
PO BOX 88188, MILWAUKEE, WI 53288-8188
PO BOX 88189, MILWAUKEE, WI 53288-8189
PO BOX 88190, MILWAUKEE, WI 53288-8190
PO BOX 88191, MILWAUKEE, WI 53288-8191
PO BOX 88192, MILWAUKEE, WI 53288-8192
PO BOX 88193, MILWAUKEE, WI 53288-8193
PO BOX 88194, MILWAUKEE, WI 53288-8194
PO BOX 88195, MILWAUKEE, WI 53288-8195
PO BOX 88196, MILWAUKEE, WI 53288-8196
PO BOX 88197, MILWAUKEE, WI 53288-8197
PO BOX 88198, MILWAUKEE, WI 53288-8198
PO BOX 88199, MILWAUKEE, WI 53288-8199
PO BOX 88200, MILWAUKEE, WI 53288-8200
PO BOX 88201, MILWAUKEE, WI 53288-8201
PO BOX 88202, MILWAUKEE, WI 53288-8202
PO BOX 88203, MILWAUKEE, WI 53288-8203
PO BOX 88204, MILWAUKEE, WI 53288-8204
PO BOX 88205, MILWAUKEE, WI 53288-8205
PO BOX 88206, MILWAUKEE, WI 53288-8206
PO BOX 88207, MILWAUKEE, WI 53288-8207
PO BOX 88208, MILWAUKEE, WI 53288-8208
PO BOX 88209, MILWAUKEE, WI 53288-8209
PO BOX 88210, MILWAUKEE, WI 53288-8210
PO BOX 88211, MILWAUKEE, WI 53288-8211
PO BOX 88212, MILWAUKEE, WI 53288-8212
PO BOX 88213, MILWAUKEE, WI 53288-8213
PO BOX 88214, MILWAUKEE, WI 53288-8214
PO BOX 88215, MILWAUKEE, WI 53288-8215
PO BOX 88216, MILWAUKEE, WI 53288-8216
PO BOX 88217, MILWAUKEE, WI 53288-8217
PO BOX 88218, MILWAUKEE, WI 53288-8218
PO BOX 88219, MILWAUKEE, WI 53288-8219
PO BOX 88220, MILWAUKEE, WI 53288-8220
PO BOX 88221, MILWAUKEE, WI 53288-8221
PO BOX 88222, MILWAUKEE, WI 53288-8222
PO BOX 88223, MILWAUKEE, WI 53288-8223
PO BOX 88224, MILWAUKEE, WI 53288-8224
PO BOX 88225, MILWAUKEE, WI 53288-8225
PO BOX 88226, MILWAUKEE, WI 53288-8226
PO BOX 88227, MILWAUKEE, WI 53288-8227
PO BOX 88228, MILWAUKEE, WI 53288-8228
PO BOX 88229, MILWAUKEE, WI 53288-8229
PO BOX 88230, MILWAUKEE, WI 53288-8230
PO BOX 88231, MILWAUKEE, WI 53288-8231
PO BOX 88232, MILWAUKEE, WI 53288-8232
PO BOX 88233, MILWAUKEE, WI 53288-8233
PO BOX 88234, MILWAUKEE, WI 53288-8234
PO BOX 88235, MILWAUKEE, WI 53288-8235
PO BOX 88236, MILWAUKEE, WI 53288-8236
PO BOX 88237, MILWAUKEE, WI 53288-8237
PO BOX 88238, MILWAUKEE, WI 53288-8238
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