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 788991, PHILADELPHIA, PA 19178-8991
PO BOX 788992, PHILADELPHIA, PA 19178-8992
PO BOX 788993, PHILADELPHIA, PA 19178-8993
PO BOX 788994, PHILADELPHIA, PA 19178-8994
PO BOX 788995, PHILADELPHIA, PA 19178-8995
PO BOX 788996, PHILADELPHIA, PA 19178-8996
PO BOX 788997, PHILADELPHIA, PA 19178-8997
PO BOX 788998, PHILADELPHIA, PA 19178-8998
PO BOX 788999, PHILADELPHIA, PA 19178-8999
PO BOX 789000, PHILADELPHIA, PA 19178-9000
PO BOX 789001, PHILADELPHIA, PA 19178-9001
PO BOX 789002, PHILADELPHIA, PA 19178-9002
PO BOX 789003, PHILADELPHIA, PA 19178-9003
PO BOX 789004, PHILADELPHIA, PA 19178-9004
PO BOX 789005, PHILADELPHIA, PA 19178-9005
PO BOX 789006, PHILADELPHIA, PA 19178-9006
PO BOX 789007, PHILADELPHIA, PA 19178-9007
PO BOX 789008, PHILADELPHIA, PA 19178-9008
PO BOX 789009, PHILADELPHIA, PA 19178-9009
PO BOX 789010, PHILADELPHIA, PA 19178-9010
PO BOX 789011, PHILADELPHIA, PA 19178-9011
PO BOX 789012, PHILADELPHIA, PA 19178-9012
PO BOX 789013, PHILADELPHIA, PA 19178-9013
PO BOX 789014, PHILADELPHIA, PA 19178-9014
PO BOX 789015, PHILADELPHIA, PA 19178-9015
PO BOX 789016, PHILADELPHIA, PA 19178-9016
PO BOX 789017, PHILADELPHIA, PA 19178-9017
PO BOX 789018, PHILADELPHIA, PA 19178-9018
PO BOX 789019, PHILADELPHIA, PA 19178-9019
PO BOX 789020, PHILADELPHIA, PA 19178-9020
PO BOX 789021, PHILADELPHIA, PA 19178-9021
PO BOX 789022, PHILADELPHIA, PA 19178-9022
PO BOX 789023, PHILADELPHIA, PA 19178-9023
PO BOX 789024, PHILADELPHIA, PA 19178-9024
PO BOX 789025, PHILADELPHIA, PA 19178-9025
PO BOX 789026, PHILADELPHIA, PA 19178-9026
PO BOX 789027, PHILADELPHIA, PA 19178-9027
PO BOX 789028, PHILADELPHIA, PA 19178-9028
PO BOX 789029, PHILADELPHIA, PA 19178-9029
PO BOX 789030, PHILADELPHIA, PA 19178-9030
PO BOX 789031, PHILADELPHIA, PA 19178-9031
PO BOX 789032, PHILADELPHIA, PA 19178-9032
PO BOX 789033, PHILADELPHIA, PA 19178-9033
PO BOX 789034, PHILADELPHIA, PA 19178-9034
PO BOX 789035, PHILADELPHIA, PA 19178-9035
PO BOX 789036, PHILADELPHIA, PA 19178-9036
PO BOX 789037, PHILADELPHIA, PA 19178-9037
PO BOX 789038, PHILADELPHIA, PA 19178-9038
PO BOX 789039, PHILADELPHIA, PA 19178-9039
PO BOX 789040, PHILADELPHIA, PA 19178-9040
PO BOX 789041, PHILADELPHIA, PA 19178-9041
PO BOX 789042, PHILADELPHIA, PA 19178-9042
PO BOX 789043, PHILADELPHIA, PA 19178-9043
PO BOX 789044, PHILADELPHIA, PA 19178-9044
PO BOX 789045, PHILADELPHIA, PA 19178-9045
PO BOX 789046, PHILADELPHIA, PA 19178-9046
PO BOX 789047, PHILADELPHIA, PA 19178-9047
PO BOX 789048, PHILADELPHIA, PA 19178-9048
PO BOX 789049, PHILADELPHIA, PA 19178-9049
PO BOX 789050, PHILADELPHIA, PA 19178-9050
PO BOX 789051, PHILADELPHIA, PA 19178-9051
PO BOX 789052, PHILADELPHIA, PA 19178-9052
PO BOX 789053, PHILADELPHIA, PA 19178-9053
PO BOX 789054, PHILADELPHIA, PA 19178-9054
PO BOX 789055, PHILADELPHIA, PA 19178-9055
PO BOX 789056, PHILADELPHIA, PA 19178-9056
PO BOX 789057, PHILADELPHIA, PA 19178-9057
PO BOX 789058, PHILADELPHIA, PA 19178-9058
PO BOX 789059, PHILADELPHIA, PA 19178-9059
PO BOX 789060, PHILADELPHIA, PA 19178-9060
PO BOX 789061, PHILADELPHIA, PA 19178-9061
PO BOX 789062, PHILADELPHIA, PA 19178-9062
PO BOX 789063, PHILADELPHIA, PA 19178-9063
PO BOX 789064, PHILADELPHIA, PA 19178-9064
PO BOX 789065, PHILADELPHIA, PA 19178-9065
PO BOX 789066, PHILADELPHIA, PA 19178-9066
PO BOX 789067, PHILADELPHIA, PA 19178-9067
PO BOX 789068, PHILADELPHIA, PA 19178-9068
PO BOX 789069, PHILADELPHIA, PA 19178-9069
PO BOX 789070, PHILADELPHIA, PA 19178-9070
PO BOX 789071, PHILADELPHIA, PA 19178-9071
PO BOX 789072, PHILADELPHIA, PA 19178-9072
PO BOX 789073, PHILADELPHIA, PA 19178-9073
PO BOX 789074, PHILADELPHIA, PA 19178-9074
PO BOX 789075, PHILADELPHIA, PA 19178-9075
PO BOX 789076, PHILADELPHIA, PA 19178-9076
PO BOX 789077, PHILADELPHIA, PA 19178-9077
PO BOX 789078, PHILADELPHIA, PA 19178-9078
PO BOX 789079, PHILADELPHIA, PA 19178-9079
PO BOX 789080, PHILADELPHIA, PA 19178-9080
PO BOX 789081, PHILADELPHIA, PA 19178-9081
PO BOX 789082, PHILADELPHIA, PA 19178-9082
PO BOX 789083, PHILADELPHIA, PA 19178-9083
PO BOX 789084, PHILADELPHIA, PA 19178-9084
PO BOX 789085, PHILADELPHIA, PA 19178-9085
PO BOX 789086, PHILADELPHIA, PA 19178-9086
PO BOX 789087, PHILADELPHIA, PA 19178-9087
PO BOX 789088, PHILADELPHIA, PA 19178-9088
PO BOX 789089, PHILADELPHIA, PA 19178-9089
PO BOX 789090, PHILADELPHIA, PA 19178-9090
PO BOX 789091, PHILADELPHIA, PA 19178-9091
PO BOX 789092, PHILADELPHIA, PA 19178-9092
PO BOX 789093, PHILADELPHIA, PA 19178-9093
PO BOX 789094, PHILADELPHIA, PA 19178-9094
PO BOX 789095, PHILADELPHIA, PA 19178-9095
PO BOX 789096, PHILADELPHIA, PA 19178-9096
PO BOX 789097, PHILADELPHIA, PA 19178-9097
PO BOX 789098, PHILADELPHIA, PA 19178-9098
PO BOX 789099, PHILADELPHIA, PA 19178-9099
PO BOX 789100, PHILADELPHIA, PA 19178-9100
PO BOX 789101, PHILADELPHIA, PA 19178-9101
PO BOX 789102, PHILADELPHIA, PA 19178-9102
PO BOX 789103, PHILADELPHIA, PA 19178-9103
PO BOX 789104, PHILADELPHIA, PA 19178-9104
PO BOX 789105, PHILADELPHIA, PA 19178-9105
PO BOX 789106, PHILADELPHIA, PA 19178-9106
PO BOX 789107, PHILADELPHIA, PA 19178-9107
PO BOX 789108, PHILADELPHIA, PA 19178-9108
PO BOX 789109, PHILADELPHIA, PA 19178-9109
PO BOX 789110, PHILADELPHIA, PA 19178-9110
PO BOX 789111, PHILADELPHIA, PA 19178-9111
PO BOX 789112, PHILADELPHIA, PA 19178-9112
PO BOX 789113, PHILADELPHIA, PA 19178-9113
PO BOX 789114, PHILADELPHIA, PA 19178-9114
PO BOX 789115, PHILADELPHIA, PA 19178-9115
PO BOX 789116, PHILADELPHIA, PA 19178-9116
PO BOX 789117, PHILADELPHIA, PA 19178-9117
PO BOX 789118, PHILADELPHIA, PA 19178-9118
PO BOX 789119, PHILADELPHIA, PA 19178-9119
PO BOX 789120, PHILADELPHIA, PA 19178-9120
PO BOX 789121, PHILADELPHIA, PA 19178-9121
PO BOX 789122, PHILADELPHIA, PA 19178-9122
PO BOX 789123, PHILADELPHIA, PA 19178-9123
PO BOX 789124, PHILADELPHIA, PA 19178-9124
PO BOX 789125, PHILADELPHIA, PA 19178-9125
PO BOX 789126, PHILADELPHIA, PA 19178-9126
PO BOX 789127, PHILADELPHIA, PA 19178-9127
PO BOX 789128, PHILADELPHIA, PA 19178-9128
PO BOX 789129, PHILADELPHIA, PA 19178-9129
PO BOX 789130, PHILADELPHIA, PA 19178-9130
PO BOX 789131, PHILADELPHIA, PA 19178-9131
PO BOX 789132, PHILADELPHIA, PA 19178-9132
PO BOX 789133, PHILADELPHIA, PA 19178-9133
PO BOX 789134, PHILADELPHIA, PA 19178-9134
PO BOX 789135, PHILADELPHIA, PA 19178-9135
PO BOX 789136, PHILADELPHIA, PA 19178-9136
PO BOX 789137, PHILADELPHIA, PA 19178-9137
PO BOX 789138, PHILADELPHIA, PA 19178-9138
PO BOX 789139, PHILADELPHIA, PA 19178-9139
PO BOX 789140, PHILADELPHIA, PA 19178-9140
PO BOX 789141, PHILADELPHIA, PA 19178-9141
PO BOX 789142, PHILADELPHIA, PA 19178-9142
PO BOX 789143, PHILADELPHIA, PA 19178-9143
PO BOX 789144, PHILADELPHIA, PA 19178-9144
PO BOX 789145, PHILADELPHIA, PA 19178-9145
PO BOX 789146, PHILADELPHIA, PA 19178-9146
PO BOX 789147, PHILADELPHIA, PA 19178-9147
PO BOX 789148, PHILADELPHIA, PA 19178-9148
PO BOX 789149, PHILADELPHIA, PA 19178-9149
PO BOX 789150, PHILADELPHIA, PA 19178-9150
PO BOX 789151, PHILADELPHIA, PA 19178-9151
PO BOX 789152, PHILADELPHIA, PA 19178-9152
PO BOX 789153, PHILADELPHIA, PA 19178-9153
PO BOX 789154, PHILADELPHIA, PA 19178-9154
PO BOX 789155, PHILADELPHIA, PA 19178-9155
PO BOX 789156, PHILADELPHIA, PA 19178-9156
PO BOX 789157, PHILADELPHIA, PA 19178-9157
PO BOX 789158, PHILADELPHIA, PA 19178-9158
PO BOX 789159, PHILADELPHIA, PA 19178-9159
PO BOX 789160, PHILADELPHIA, PA 19178-9160
PO BOX 789161, PHILADELPHIA, PA 19178-9161
PO BOX 789162, PHILADELPHIA, PA 19178-9162
PO BOX 789163, PHILADELPHIA, PA 19178-9163
PO BOX 789164, PHILADELPHIA, PA 19178-9164
PO BOX 789165, PHILADELPHIA, PA 19178-9165
PO BOX 789166, PHILADELPHIA, PA 19178-9166
PO BOX 789167, PHILADELPHIA, PA 19178-9167
PO BOX 789168, PHILADELPHIA, PA 19178-9168
PO BOX 789169, PHILADELPHIA, PA 19178-9169
PO BOX 789170, PHILADELPHIA, PA 19178-9170
PO BOX 789171, PHILADELPHIA, PA 19178-9171
PO BOX 789172, PHILADELPHIA, PA 19178-9172
PO BOX 789173, PHILADELPHIA, PA 19178-9173
PO BOX 789174, PHILADELPHIA, PA 19178-9174
PO BOX 789175, PHILADELPHIA, PA 19178-9175
PO BOX 789176, PHILADELPHIA, PA 19178-9176
PO BOX 789177, PHILADELPHIA, PA 19178-9177
PO BOX 789178, PHILADELPHIA, PA 19178-9178
PO BOX 789179, PHILADELPHIA, PA 19178-9179
PO BOX 789180, PHILADELPHIA, PA 19178-9180
PO BOX 789181, PHILADELPHIA, PA 19178-9181
PO BOX 789182, PHILADELPHIA, PA 19178-9182
PO BOX 789183, PHILADELPHIA, PA 19178-9183
PO BOX 789184, PHILADELPHIA, PA 19178-9184
PO BOX 789185, PHILADELPHIA, PA 19178-9185
PO BOX 789186, PHILADELPHIA, PA 19178-9186
PO BOX 789187, PHILADELPHIA, PA 19178-9187
PO BOX 789188, PHILADELPHIA, PA 19178-9188
PO BOX 789189, PHILADELPHIA, PA 19178-9189
PO BOX 789190, PHILADELPHIA, PA 19178-9190
PO BOX 789191, PHILADELPHIA, PA 19178-9191
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