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 392000, PITTSBURGH, PA 15251-9000
PO BOX 392001, PITTSBURGH, PA 15251-9001
PO BOX 392002, PITTSBURGH, PA 15251-9002
PO BOX 392003, PITTSBURGH, PA 15251-9003
PO BOX 392004, PITTSBURGH, PA 15251-9004
PO BOX 392005, PITTSBURGH, PA 15251-9005
PO BOX 392006, PITTSBURGH, PA 15251-9006
PO BOX 392007, PITTSBURGH, PA 15251-9007
PO BOX 392008, PITTSBURGH, PA 15251-9008
PO BOX 392009, PITTSBURGH, PA 15251-9009
PO BOX 392010, PITTSBURGH, PA 15251-9010
PO BOX 392011, PITTSBURGH, PA 15251-9011
PO BOX 392012, PITTSBURGH, PA 15251-9012
PO BOX 392013, PITTSBURGH, PA 15251-9013
PO BOX 392014, PITTSBURGH, PA 15251-9014
PO BOX 392015, PITTSBURGH, PA 15251-9015
PO BOX 392016, PITTSBURGH, PA 15251-9016
PO BOX 392017, PITTSBURGH, PA 15251-9017
PO BOX 392018, PITTSBURGH, PA 15251-9018
PO BOX 392019, PITTSBURGH, PA 15251-9019
PO BOX 392020, PITTSBURGH, PA 15251-9020
PO BOX 392021, PITTSBURGH, PA 15251-9021
PO BOX 392022, PITTSBURGH, PA 15251-9022
PO BOX 392023, PITTSBURGH, PA 15251-9023
PO BOX 392024, PITTSBURGH, PA 15251-9024
PO BOX 392025, PITTSBURGH, PA 15251-9025
PO BOX 392026, PITTSBURGH, PA 15251-9026
PO BOX 392027, PITTSBURGH, PA 15251-9027
PO BOX 392028, PITTSBURGH, PA 15251-9028
PO BOX 392029, PITTSBURGH, PA 15251-9029
PO BOX 392030, PITTSBURGH, PA 15251-9030
PO BOX 392031, PITTSBURGH, PA 15251-9031
PO BOX 392032, PITTSBURGH, PA 15251-9032
PO BOX 392033, PITTSBURGH, PA 15251-9033
PO BOX 392034, PITTSBURGH, PA 15251-9034
PO BOX 392035, PITTSBURGH, PA 15251-9035
PO BOX 392036, PITTSBURGH, PA 15251-9036
PO BOX 392037, PITTSBURGH, PA 15251-9037
PO BOX 392038, PITTSBURGH, PA 15251-9038
PO BOX 392039, PITTSBURGH, PA 15251-9039
PO BOX 392040, PITTSBURGH, PA 15251-9040
PO BOX 392041, PITTSBURGH, PA 15251-9041
PO BOX 392042, PITTSBURGH, PA 15251-9042
PO BOX 392043, PITTSBURGH, PA 15251-9043
PO BOX 392044, PITTSBURGH, PA 15251-9044
PO BOX 392045, PITTSBURGH, PA 15251-9045
PO BOX 392046, PITTSBURGH, PA 15251-9046
PO BOX 392047, PITTSBURGH, PA 15251-9047
PO BOX 392048, PITTSBURGH, PA 15251-9048
PO BOX 392049, PITTSBURGH, PA 15251-9049
PO BOX 392050, PITTSBURGH, PA 15251-9050
PO BOX 392051, PITTSBURGH, PA 15251-9051
PO BOX 392052, PITTSBURGH, PA 15251-9052
PO BOX 392053, PITTSBURGH, PA 15251-9053
PO BOX 392054, PITTSBURGH, PA 15251-9054
PO BOX 392055, PITTSBURGH, PA 15251-9055
PO BOX 392056, PITTSBURGH, PA 15251-9056
PO BOX 392057, PITTSBURGH, PA 15251-9057
PO BOX 392058, PITTSBURGH, PA 15251-9058
PO BOX 392059, PITTSBURGH, PA 15251-9059
PO BOX 392060, PITTSBURGH, PA 15251-9060
PO BOX 392061, PITTSBURGH, PA 15251-9061
PO BOX 392062, PITTSBURGH, PA 15251-9062
PO BOX 392063, PITTSBURGH, PA 15251-9063
PO BOX 392064, PITTSBURGH, PA 15251-9064
PO BOX 392065, PITTSBURGH, PA 15251-9065
PO BOX 392066, PITTSBURGH, PA 15251-9066
PO BOX 392067, PITTSBURGH, PA 15251-9067
PO BOX 392068, PITTSBURGH, PA 15251-9068
PO BOX 392069, PITTSBURGH, PA 15251-9069
PO BOX 392070, PITTSBURGH, PA 15251-9070
PO BOX 392071, PITTSBURGH, PA 15251-9071
PO BOX 392072, PITTSBURGH, PA 15251-9072
PO BOX 392073, PITTSBURGH, PA 15251-9073
PO BOX 392074, PITTSBURGH, PA 15251-9074
PO BOX 392075, PITTSBURGH, PA 15251-9075
PO BOX 392076, PITTSBURGH, PA 15251-9076
PO BOX 392077, PITTSBURGH, PA 15251-9077
PO BOX 392078, PITTSBURGH, PA 15251-9078
PO BOX 392079, PITTSBURGH, PA 15251-9079
PO BOX 392080, PITTSBURGH, PA 15251-9080
PO BOX 392081, PITTSBURGH, PA 15251-9081
PO BOX 392082, PITTSBURGH, PA 15251-9082
PO BOX 392083, PITTSBURGH, PA 15251-9083
PO BOX 392084, PITTSBURGH, PA 15251-9084
PO BOX 392085, PITTSBURGH, PA 15251-9085
PO BOX 392086, PITTSBURGH, PA 15251-9086
PO BOX 392087, PITTSBURGH, PA 15251-9087
PO BOX 392088, PITTSBURGH, PA 15251-9088
PO BOX 392089, PITTSBURGH, PA 15251-9089
PO BOX 392090, PITTSBURGH, PA 15251-9090
PO BOX 392091, PITTSBURGH, PA 15251-9091
PO BOX 392092, PITTSBURGH, PA 15251-9092
PO BOX 392093, PITTSBURGH, PA 15251-9093
PO BOX 392094, PITTSBURGH, PA 15251-9094
PO BOX 392095, PITTSBURGH, PA 15251-9095
PO BOX 392096, PITTSBURGH, PA 15251-9096
PO BOX 392097, PITTSBURGH, PA 15251-9097
PO BOX 392098, PITTSBURGH, PA 15251-9098
PO BOX 392099, PITTSBURGH, PA 15251-9099
PO BOX 392100, PITTSBURGH, PA 15251-9100
PO BOX 392101, PITTSBURGH, PA 15251-9101
PO BOX 392102, PITTSBURGH, PA 15251-9102
PO BOX 392103, PITTSBURGH, PA 15251-9103
PO BOX 392104, PITTSBURGH, PA 15251-9104
PO BOX 392105, PITTSBURGH, PA 15251-9105
PO BOX 392106, PITTSBURGH, PA 15251-9106
PO BOX 392107, PITTSBURGH, PA 15251-9107
PO BOX 392108, PITTSBURGH, PA 15251-9108
PO BOX 392109, PITTSBURGH, PA 15251-9109
PO BOX 392110, PITTSBURGH, PA 15251-9110
PO BOX 392111, PITTSBURGH, PA 15251-9111
PO BOX 392112, PITTSBURGH, PA 15251-9112
PO BOX 392113, PITTSBURGH, PA 15251-9113
PO BOX 392114, PITTSBURGH, PA 15251-9114
PO BOX 392115, PITTSBURGH, PA 15251-9115
PO BOX 392116, PITTSBURGH, PA 15251-9116
PO BOX 392117, PITTSBURGH, PA 15251-9117
PO BOX 392118, PITTSBURGH, PA 15251-9118
PO BOX 392119, PITTSBURGH, PA 15251-9119
PO BOX 392120, PITTSBURGH, PA 15251-9120
PO BOX 392121, PITTSBURGH, PA 15251-9121
PO BOX 392122, PITTSBURGH, PA 15251-9122
PO BOX 392123, PITTSBURGH, PA 15251-9123
PO BOX 392124, PITTSBURGH, PA 15251-9124
PO BOX 392125, PITTSBURGH, PA 15251-9125
PO BOX 392126, PITTSBURGH, PA 15251-9126
PO BOX 392127, PITTSBURGH, PA 15251-9127
PO BOX 392128, PITTSBURGH, PA 15251-9128
PO BOX 392129, PITTSBURGH, PA 15251-9129
PO BOX 392130, PITTSBURGH, PA 15251-9130
PO BOX 392131, PITTSBURGH, PA 15251-9131
PO BOX 392132, PITTSBURGH, PA 15251-9132
PO BOX 392133, PITTSBURGH, PA 15251-9133
PO BOX 392134, PITTSBURGH, PA 15251-9134
PO BOX 392135, PITTSBURGH, PA 15251-9135
PO BOX 392136, PITTSBURGH, PA 15251-9136
PO BOX 392137, PITTSBURGH, PA 15251-9137
PO BOX 392138, PITTSBURGH, PA 15251-9138
PO BOX 392139, PITTSBURGH, PA 15251-9139
PO BOX 392140, PITTSBURGH, PA 15251-9140
PO BOX 392141, PITTSBURGH, PA 15251-9141
PO BOX 392142, PITTSBURGH, PA 15251-9142
PO BOX 392143, PITTSBURGH, PA 15251-9143
PO BOX 392144, PITTSBURGH, PA 15251-9144
PO BOX 392145, PITTSBURGH, PA 15251-9145
PO BOX 392146, PITTSBURGH, PA 15251-9146
PO BOX 392147, PITTSBURGH, PA 15251-9147
PO BOX 392148, PITTSBURGH, PA 15251-9148
PO BOX 392149, PITTSBURGH, PA 15251-9149
PO BOX 392150, PITTSBURGH, PA 15251-9150
PO BOX 392151, PITTSBURGH, PA 15251-9151
PO BOX 392152, PITTSBURGH, PA 15251-9152
PO BOX 392153, PITTSBURGH, PA 15251-9153
PO BOX 392154, PITTSBURGH, PA 15251-9154
PO BOX 392155, PITTSBURGH, PA 15251-9155
PO BOX 392156, PITTSBURGH, PA 15251-9156
PO BOX 392157, PITTSBURGH, PA 15251-9157
PO BOX 392158, PITTSBURGH, PA 15251-9158
PO BOX 392159, PITTSBURGH, PA 15251-9159
PO BOX 392160, PITTSBURGH, PA 15251-9160
PO BOX 392161, PITTSBURGH, PA 15251-9161
PO BOX 392162, PITTSBURGH, PA 15251-9162
PO BOX 392163, PITTSBURGH, PA 15251-9163
PO BOX 392164, PITTSBURGH, PA 15251-9164
PO BOX 392165, PITTSBURGH, PA 15251-9165
PO BOX 392166, PITTSBURGH, PA 15251-9166
PO BOX 392167, PITTSBURGH, PA 15251-9167
PO BOX 392168, PITTSBURGH, PA 15251-9168
PO BOX 392169, PITTSBURGH, PA 15251-9169
PO BOX 392170, PITTSBURGH, PA 15251-9170
PO BOX 392171, PITTSBURGH, PA 15251-9171
PO BOX 392172, PITTSBURGH, PA 15251-9172
PO BOX 392173, PITTSBURGH, PA 15251-9173
PO BOX 392174, PITTSBURGH, PA 15251-9174
PO BOX 392175, PITTSBURGH, PA 15251-9175
PO BOX 392176, PITTSBURGH, PA 15251-9176
PO BOX 392177, PITTSBURGH, PA 15251-9177
PO BOX 392178, PITTSBURGH, PA 15251-9178
PO BOX 392179, PITTSBURGH, PA 15251-9179
PO BOX 392180, PITTSBURGH, PA 15251-9180
PO BOX 392181, PITTSBURGH, PA 15251-9181
PO BOX 392182, PITTSBURGH, PA 15251-9182
PO BOX 392183, PITTSBURGH, PA 15251-9183
PO BOX 392184, PITTSBURGH, PA 15251-9184
PO BOX 392185, PITTSBURGH, PA 15251-9185
PO BOX 392186, PITTSBURGH, PA 15251-9186
PO BOX 392187, PITTSBURGH, PA 15251-9187
PO BOX 392188, PITTSBURGH, PA 15251-9188
PO BOX 392189, PITTSBURGH, PA 15251-9189
PO BOX 392190, PITTSBURGH, PA 15251-9190
PO BOX 392191, PITTSBURGH, PA 15251-9191
PO BOX 392192, PITTSBURGH, PA 15251-9192
PO BOX 392193, PITTSBURGH, PA 15251-9193
PO BOX 392194, PITTSBURGH, PA 15251-9194
PO BOX 392195, PITTSBURGH, PA 15251-9195
PO BOX 392196, PITTSBURGH, PA 15251-9196
PO BOX 392197, PITTSBURGH, PA 15251-9197
PO BOX 392198, PITTSBURGH, PA 15251-9198
PO BOX 392199, PITTSBURGH, PA 15251-9199
PO BOX 392200, PITTSBURGH, PA 15251-9200
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