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 6000, SIOUX FALLS, SD 57117-6000
PO BOX 6001, SIOUX FALLS, SD 57117-6001
PO BOX 6002, SIOUX FALLS, SD 57117-6002
PO BOX 6003, SIOUX FALLS, SD 57117-6003
PO BOX 6004, SIOUX FALLS, SD 57117-6004
PO BOX 6005, SIOUX FALLS, SD 57117-6005
PO BOX 6006, SIOUX FALLS, SD 57117-6006
PO BOX 6007, SIOUX FALLS, SD 57117-6007
PO BOX 6008, SIOUX FALLS, SD 57117-6008
PO BOX 6009, SIOUX FALLS, SD 57117-6009
PO BOX 6010, SIOUX FALLS, SD 57117-6010
PO BOX 6011, SIOUX FALLS, SD 57117-6011
PO BOX 6012, SIOUX FALLS, SD 57117-6012
PO BOX 6013, SIOUX FALLS, SD 57117-6013
PO BOX 6014, SIOUX FALLS, SD 57117-6014
PO BOX 6015, SIOUX FALLS, SD 57117-6015
PO BOX 6016, SIOUX FALLS, SD 57117-6016
PO BOX 6017, SIOUX FALLS, SD 57117-6017
PO BOX 6018, SIOUX FALLS, SD 57117-6018
PO BOX 6019, SIOUX FALLS, SD 57117-6019
PO BOX 6020, SIOUX FALLS, SD 57117-6020
PO BOX 6021, SIOUX FALLS, SD 57117-6021
PO BOX 6022, SIOUX FALLS, SD 57117-6022
PO BOX 6023, SIOUX FALLS, SD 57117-6023
PO BOX 6024, SIOUX FALLS, SD 57117-6024
PO BOX 6025, SIOUX FALLS, SD 57117-6025
PO BOX 6026, SIOUX FALLS, SD 57117-6026
PO BOX 6027, SIOUX FALLS, SD 57117-6027
PO BOX 6028, SIOUX FALLS, SD 57117-6028
PO BOX 6029, SIOUX FALLS, SD 57117-6029
PO BOX 6030, SIOUX FALLS, SD 57117-6030
PO BOX 6031, SIOUX FALLS, SD 57117-6031
PO BOX 6032, SIOUX FALLS, SD 57117-6032
PO BOX 6033, SIOUX FALLS, SD 57117-6033
PO BOX 6034, SIOUX FALLS, SD 57117-6034
PO BOX 6035, SIOUX FALLS, SD 57117-6035
PO BOX 6036, SIOUX FALLS, SD 57117-6036
PO BOX 6037, SIOUX FALLS, SD 57117-6037
PO BOX 6038, SIOUX FALLS, SD 57117-6038
PO BOX 6039, SIOUX FALLS, SD 57117-6039
PO BOX 6040, SIOUX FALLS, SD 57117-6040
PO BOX 6041, SIOUX FALLS, SD 57117-6041
PO BOX 6042, SIOUX FALLS, SD 57117-6042
PO BOX 6043, SIOUX FALLS, SD 57117-6043
PO BOX 6044, SIOUX FALLS, SD 57117-6044
PO BOX 6045, SIOUX FALLS, SD 57117-6045
PO BOX 6046, SIOUX FALLS, SD 57117-6046
PO BOX 6047, SIOUX FALLS, SD 57117-6047
PO BOX 6048, SIOUX FALLS, SD 57117-6048
PO BOX 6049, SIOUX FALLS, SD 57117-6049
PO BOX 6050, SIOUX FALLS, SD 57117-6050
PO BOX 6051, SIOUX FALLS, SD 57117-6051
PO BOX 6052, SIOUX FALLS, SD 57117-6052
PO BOX 6053, SIOUX FALLS, SD 57117-6053
PO BOX 6054, SIOUX FALLS, SD 57117-6054
PO BOX 6055, SIOUX FALLS, SD 57117-6055
PO BOX 6056, SIOUX FALLS, SD 57117-6056
PO BOX 6057, SIOUX FALLS, SD 57117-6057
PO BOX 6058, SIOUX FALLS, SD 57117-6058
PO BOX 6059, SIOUX FALLS, SD 57117-6059
PO BOX 6060, SIOUX FALLS, SD 57117-6060
PO BOX 6061, SIOUX FALLS, SD 57117-6061
PO BOX 6062, SIOUX FALLS, SD 57117-6062
PO BOX 6063, SIOUX FALLS, SD 57117-6063
PO BOX 6064, SIOUX FALLS, SD 57117-6064
PO BOX 6065, SIOUX FALLS, SD 57117-6065
PO BOX 6066, SIOUX FALLS, SD 57117-6066
PO BOX 6067, SIOUX FALLS, SD 57117-6067
PO BOX 6068, SIOUX FALLS, SD 57117-6068
PO BOX 6069, SIOUX FALLS, SD 57117-6069
PO BOX 6070, SIOUX FALLS, SD 57117-6070
PO BOX 6071, SIOUX FALLS, SD 57117-6071
PO BOX 6072, SIOUX FALLS, SD 57117-6072
PO BOX 6073, SIOUX FALLS, SD 57117-6073
PO BOX 6074, SIOUX FALLS, SD 57117-6074
PO BOX 6075, SIOUX FALLS, SD 57117-6075
PO BOX 6076, SIOUX FALLS, SD 57117-6076
PO BOX 6077, SIOUX FALLS, SD 57117-6077
PO BOX 6078, SIOUX FALLS, SD 57117-6078
PO BOX 6079, SIOUX FALLS, SD 57117-6079
PO BOX 6080, SIOUX FALLS, SD 57117-6080
PO BOX 6081, SIOUX FALLS, SD 57117-6081
PO BOX 6082, SIOUX FALLS, SD 57117-6082
PO BOX 6083, SIOUX FALLS, SD 57117-6083
PO BOX 6084, SIOUX FALLS, SD 57117-6084
PO BOX 6085, SIOUX FALLS, SD 57117-6085
PO BOX 6086, SIOUX FALLS, SD 57117-6086
PO BOX 6087, SIOUX FALLS, SD 57117-6087
PO BOX 6088, SIOUX FALLS, SD 57117-6088
PO BOX 6089, SIOUX FALLS, SD 57117-6089
PO BOX 6090, SIOUX FALLS, SD 57117-6090
PO BOX 6091, SIOUX FALLS, SD 57117-6091
PO BOX 6092, SIOUX FALLS, SD 57117-6092
PO BOX 6093, SIOUX FALLS, SD 57117-6093
PO BOX 6094, SIOUX FALLS, SD 57117-6094
PO BOX 6095, SIOUX FALLS, SD 57117-6095
PO BOX 6096, SIOUX FALLS, SD 57117-6096
PO BOX 6097, SIOUX FALLS, SD 57117-6097
PO BOX 6098, SIOUX FALLS, SD 57117-6098
PO BOX 6099, SIOUX FALLS, SD 57117-6099
PO BOX 6100, SIOUX FALLS, SD 57117-6100
PO BOX 6101, SIOUX FALLS, SD 57117-6101
PO BOX 6102, SIOUX FALLS, SD 57117-6102
PO BOX 6103, SIOUX FALLS, SD 57117-6103
PO BOX 6104, SIOUX FALLS, SD 57117-6104
PO BOX 6105, SIOUX FALLS, SD 57117-6105
PO BOX 6106, SIOUX FALLS, SD 57117-6106
PO BOX 6107, SIOUX FALLS, SD 57117-6107
PO BOX 6108, SIOUX FALLS, SD 57117-6108
PO BOX 6109, SIOUX FALLS, SD 57117-6109
PO BOX 6110, SIOUX FALLS, SD 57117-6110
PO BOX 6111, SIOUX FALLS, SD 57117-6111
PO BOX 6112, SIOUX FALLS, SD 57117-6112
PO BOX 6113, SIOUX FALLS, SD 57117-6113
PO BOX 6114, SIOUX FALLS, SD 57117-6114
PO BOX 6115, SIOUX FALLS, SD 57117-6115
PO BOX 6116, SIOUX FALLS, SD 57117-6116
PO BOX 6117, SIOUX FALLS, SD 57117-6117
PO BOX 6118, SIOUX FALLS, SD 57117-6118
PO BOX 6119, SIOUX FALLS, SD 57117-6119
PO BOX 6120, SIOUX FALLS, SD 57117-6120
PO BOX 6121, SIOUX FALLS, SD 57117-6121
PO BOX 6122, SIOUX FALLS, SD 57117-6122
PO BOX 6123, SIOUX FALLS, SD 57117-6123
PO BOX 6124, SIOUX FALLS, SD 57117-6124
PO BOX 6125, SIOUX FALLS, SD 57117-6125
PO BOX 6126, SIOUX FALLS, SD 57117-6126
PO BOX 6127, SIOUX FALLS, SD 57117-6127
PO BOX 6128, SIOUX FALLS, SD 57117-6128
PO BOX 6129, SIOUX FALLS, SD 57117-6129
PO BOX 6130, SIOUX FALLS, SD 57117-6130
PO BOX 6131, SIOUX FALLS, SD 57117-6131
PO BOX 6132, SIOUX FALLS, SD 57117-6132
PO BOX 6133, SIOUX FALLS, SD 57117-6133
PO BOX 6134, SIOUX FALLS, SD 57117-6134
PO BOX 6135, SIOUX FALLS, SD 57117-6135
PO BOX 6136, SIOUX FALLS, SD 57117-6136
PO BOX 6137, SIOUX FALLS, SD 57117-6137
PO BOX 6138, SIOUX FALLS, SD 57117-6138
PO BOX 6139, SIOUX FALLS, SD 57117-6139
PO BOX 6140, SIOUX FALLS, SD 57117-6140
PO BOX 6141, SIOUX FALLS, SD 57117-6141
PO BOX 6142, SIOUX FALLS, SD 57117-6142
PO BOX 6143, SIOUX FALLS, SD 57117-6143
PO BOX 6144, SIOUX FALLS, SD 57117-6144
PO BOX 6145, SIOUX FALLS, SD 57117-6145
PO BOX 6146, SIOUX FALLS, SD 57117-6146
PO BOX 6147, SIOUX FALLS, SD 57117-6147
PO BOX 6148, SIOUX FALLS, SD 57117-6148
PO BOX 6149, SIOUX FALLS, SD 57117-6149
PO BOX 6150, SIOUX FALLS, SD 57117-6150
PO BOX 6151, SIOUX FALLS, SD 57117-6151
PO BOX 6152, SIOUX FALLS, SD 57117-6152
PO BOX 6153, SIOUX FALLS, SD 57117-6153
PO BOX 6154, SIOUX FALLS, SD 57117-6154
PO BOX 6155, SIOUX FALLS, SD 57117-6155
PO BOX 6156, SIOUX FALLS, SD 57117-6156
PO BOX 6157, SIOUX FALLS, SD 57117-6157
PO BOX 6158, SIOUX FALLS, SD 57117-6158
PO BOX 6159, SIOUX FALLS, SD 57117-6159
PO BOX 6160, SIOUX FALLS, SD 57117-6160
PO BOX 6161, SIOUX FALLS, SD 57117-6161
PO BOX 6162, SIOUX FALLS, SD 57117-6162
PO BOX 6163, SIOUX FALLS, SD 57117-6163
PO BOX 6164, SIOUX FALLS, SD 57117-6164
PO BOX 6165, SIOUX FALLS, SD 57117-6165
PO BOX 6166, SIOUX FALLS, SD 57117-6166
PO BOX 6167, SIOUX FALLS, SD 57117-6167
PO BOX 6168, SIOUX FALLS, SD 57117-6168
PO BOX 6169, SIOUX FALLS, SD 57117-6169
PO BOX 6170, SIOUX FALLS, SD 57117-6170
PO BOX 6171, SIOUX FALLS, SD 57117-6171
PO BOX 6172, SIOUX FALLS, SD 57117-6172
PO BOX 6173, SIOUX FALLS, SD 57117-6173
PO BOX 6174, SIOUX FALLS, SD 57117-6174
PO BOX 6175, SIOUX FALLS, SD 57117-6175
PO BOX 6176, SIOUX FALLS, SD 57117-6176
PO BOX 6177, SIOUX FALLS, SD 57117-6177
PO BOX 6178, SIOUX FALLS, SD 57117-6178
PO BOX 6179, SIOUX FALLS, SD 57117-6179
PO BOX 6180, SIOUX FALLS, SD 57117-6180
PO BOX 6181, SIOUX FALLS, SD 57117-6181
PO BOX 6182, SIOUX FALLS, SD 57117-6182
PO BOX 6183, SIOUX FALLS, SD 57117-6183
PO BOX 6184, SIOUX FALLS, SD 57117-6184
PO BOX 6185, SIOUX FALLS, SD 57117-6185
PO BOX 6186, SIOUX FALLS, SD 57117-6186
PO BOX 6187, SIOUX FALLS, SD 57117-6187
PO BOX 6188, SIOUX FALLS, SD 57117-6188
PO BOX 6189, SIOUX FALLS, SD 57117-6189
PO BOX 6190, SIOUX FALLS, SD 57117-6190
PO BOX 6191, SIOUX FALLS, SD 57117-6191
PO BOX 6192, SIOUX FALLS, SD 57117-6192
PO BOX 6193, SIOUX FALLS, SD 57117-6193
PO BOX 6194, SIOUX FALLS, SD 57117-6194
PO BOX 6195, SIOUX FALLS, SD 57117-6195
PO BOX 6196, SIOUX FALLS, SD 57117-6196
PO BOX 6197, SIOUX FALLS, SD 57117-6197
PO BOX 6198, SIOUX FALLS, SD 57117-6198
PO BOX 6199, SIOUX FALLS, SD 57117-6199
PO BOX 6200, SIOUX FALLS, SD 57117-6200
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