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 18081, LOUISVILLE, KY 40261-0081
PO BOX 18082, LOUISVILLE, KY 40261-0082
PO BOX 18083, LOUISVILLE, KY 40261-0083
PO BOX 18084, LOUISVILLE, KY 40261-0084
PO BOX 18085, LOUISVILLE, KY 40261-0085
PO BOX 18086, LOUISVILLE, KY 40261-0086
PO BOX 18087, LOUISVILLE, KY 40261-0087
PO BOX 18088, LOUISVILLE, KY 40261-0088
PO BOX 18089, LOUISVILLE, KY 40261-0089
PO BOX 18090, LOUISVILLE, KY 40261-0090
PO BOX 18091, LOUISVILLE, KY 40261-0091
PO BOX 18092, LOUISVILLE, KY 40261-0092
PO BOX 18093, LOUISVILLE, KY 40261-0093
PO BOX 18094, LOUISVILLE, KY 40261-0094
PO BOX 18095, LOUISVILLE, KY 40261-0095
PO BOX 18096, LOUISVILLE, KY 40261-0096
PO BOX 18097, LOUISVILLE, KY 40261-0097
PO BOX 18098, LOUISVILLE, KY 40261-0098
PO BOX 18099, LOUISVILLE, KY 40261-0099
PO BOX 18100, LOUISVILLE, KY 40261-0100
PO BOX 18101, LOUISVILLE, KY 40261-0101
PO BOX 18102, LOUISVILLE, KY 40261-0102
PO BOX 18103, LOUISVILLE, KY 40261-0103
PO BOX 18104, LOUISVILLE, KY 40261-0104
PO BOX 18105, LOUISVILLE, KY 40261-0105
PO BOX 18106, LOUISVILLE, KY 40261-0106
PO BOX 18107, LOUISVILLE, KY 40261-0107
PO BOX 18108, LOUISVILLE, KY 40261-0108
PO BOX 18109, LOUISVILLE, KY 40261-0109
PO BOX 18110, LOUISVILLE, KY 40261-0110
PO BOX 18111, LOUISVILLE, KY 40261-0111
PO BOX 18112, LOUISVILLE, KY 40261-0112
PO BOX 18113, LOUISVILLE, KY 40261-0113
PO BOX 18114, LOUISVILLE, KY 40261-0114
PO BOX 18115, LOUISVILLE, KY 40261-0115
PO BOX 18116, LOUISVILLE, KY 40261-0116
PO BOX 18117, LOUISVILLE, KY 40261-0117
PO BOX 18118, LOUISVILLE, KY 40261-0118
PO BOX 18119, LOUISVILLE, KY 40261-0119
PO BOX 18120, LOUISVILLE, KY 40261-0120
PO BOX 18121, LOUISVILLE, KY 40261-0121
PO BOX 18122, LOUISVILLE, KY 40261-0122
PO BOX 18123, LOUISVILLE, KY 40261-0123
PO BOX 18124, LOUISVILLE, KY 40261-0124
PO BOX 18125, LOUISVILLE, KY 40261-0125
PO BOX 18126, LOUISVILLE, KY 40261-0126
PO BOX 18127, LOUISVILLE, KY 40261-0127
PO BOX 18128, LOUISVILLE, KY 40261-0128
PO BOX 18129, LOUISVILLE, KY 40261-0129
PO BOX 18130, LOUISVILLE, KY 40261-0130
PO BOX 18131, LOUISVILLE, KY 40261-0131
PO BOX 18132, LOUISVILLE, KY 40261-0132
PO BOX 18133, LOUISVILLE, KY 40261-0133
PO BOX 18134, LOUISVILLE, KY 40261-0134
PO BOX 18135, LOUISVILLE, KY 40261-0135
PO BOX 18136, LOUISVILLE, KY 40261-0136
PO BOX 18137, LOUISVILLE, KY 40261-0137
PO BOX 18138, LOUISVILLE, KY 40261-0138
PO BOX 18139, LOUISVILLE, KY 40261-0139
PO BOX 18140, LOUISVILLE, KY 40261-0140
PO BOX 18141, LOUISVILLE, KY 40261-0141
PO BOX 18142, LOUISVILLE, KY 40261-0142
PO BOX 18143, LOUISVILLE, KY 40261-0143
PO BOX 18144, LOUISVILLE, KY 40261-0144
PO BOX 18145, LOUISVILLE, KY 40261-0145
PO BOX 18146, LOUISVILLE, KY 40261-0146
PO BOX 18147, LOUISVILLE, KY 40261-0147
PO BOX 18148, LOUISVILLE, KY 40261-0148
PO BOX 18149, LOUISVILLE, KY 40261-0149
PO BOX 18150, LOUISVILLE, KY 40261-0150
PO BOX 18151, LOUISVILLE, KY 40261-0151
PO BOX 18152, LOUISVILLE, KY 40261-0152
PO BOX 18153, LOUISVILLE, KY 40261-0153
PO BOX 18154, LOUISVILLE, KY 40261-0154
PO BOX 18155, LOUISVILLE, KY 40261-0155
PO BOX 18156, LOUISVILLE, KY 40261-0156
PO BOX 18157, LOUISVILLE, KY 40261-0157
PO BOX 18158, LOUISVILLE, KY 40261-0158
PO BOX 18159, LOUISVILLE, KY 40261-0159
PO BOX 18160, LOUISVILLE, KY 40261-0160
PO BOX 18161, LOUISVILLE, KY 40261-0161
PO BOX 18162, LOUISVILLE, KY 40261-0162
PO BOX 18163, LOUISVILLE, KY 40261-0163
PO BOX 18164, LOUISVILLE, KY 40261-0164
PO BOX 18165, LOUISVILLE, KY 40261-0165
PO BOX 18166, LOUISVILLE, KY 40261-0166
PO BOX 18167, LOUISVILLE, KY 40261-0167
PO BOX 18168, LOUISVILLE, KY 40261-0168
PO BOX 18169, LOUISVILLE, KY 40261-0169
PO BOX 18170, LOUISVILLE, KY 40261-0170
PO BOX 18171, LOUISVILLE, KY 40261-0171
PO BOX 18172, LOUISVILLE, KY 40261-0172
PO BOX 18173, LOUISVILLE, KY 40261-0173
PO BOX 18174, LOUISVILLE, KY 40261-0174
PO BOX 18175, LOUISVILLE, KY 40261-0175
PO BOX 18176, LOUISVILLE, KY 40261-0176
PO BOX 18177, LOUISVILLE, KY 40261-0177
PO BOX 18178, LOUISVILLE, KY 40261-0178
PO BOX 18179, LOUISVILLE, KY 40261-0179
PO BOX 18180, LOUISVILLE, KY 40261-0180
PO BOX 18181, LOUISVILLE, KY 40261-0181
PO BOX 18182, LOUISVILLE, KY 40261-0182
PO BOX 18183, LOUISVILLE, KY 40261-0183
PO BOX 18184, LOUISVILLE, KY 40261-0184
PO BOX 18185, LOUISVILLE, KY 40261-0185
PO BOX 18186, LOUISVILLE, KY 40261-0186
PO BOX 18187, LOUISVILLE, KY 40261-0187
PO BOX 18188, LOUISVILLE, KY 40261-0188
PO BOX 18189, LOUISVILLE, KY 40261-0189
PO BOX 18190, LOUISVILLE, KY 40261-0190
PO BOX 18191, LOUISVILLE, KY 40261-0191
PO BOX 18192, LOUISVILLE, KY 40261-0192
PO BOX 18193, LOUISVILLE, KY 40261-0193
PO BOX 18194, LOUISVILLE, KY 40261-0194
PO BOX 18195, LOUISVILLE, KY 40261-0195
PO BOX 18196, LOUISVILLE, KY 40261-0196
PO BOX 18197, LOUISVILLE, KY 40261-0197
PO BOX 18198, LOUISVILLE, KY 40261-0198
PO BOX 18199, LOUISVILLE, KY 40261-0199
PO BOX 18200, LOUISVILLE, KY 40261-0200
PO BOX 18201, LOUISVILLE, KY 40261-0201
PO BOX 18202, LOUISVILLE, KY 40261-0202
PO BOX 18203, LOUISVILLE, KY 40261-0203
PO BOX 18204, LOUISVILLE, KY 40261-0204
PO BOX 18205, LOUISVILLE, KY 40261-0205
PO BOX 18206, LOUISVILLE, KY 40261-0206
PO BOX 18207, LOUISVILLE, KY 40261-0207
PO BOX 18208, LOUISVILLE, KY 40261-0208
PO BOX 18209, LOUISVILLE, KY 40261-0209
PO BOX 18210, LOUISVILLE, KY 40261-0210
PO BOX 18211, LOUISVILLE, KY 40261-0211
PO BOX 18212, LOUISVILLE, KY 40261-0212
PO BOX 18213, LOUISVILLE, KY 40261-0213
PO BOX 18214, LOUISVILLE, KY 40261-0214
PO BOX 18215, LOUISVILLE, KY 40261-0215
PO BOX 18216, LOUISVILLE, KY 40261-0216
PO BOX 18217, LOUISVILLE, KY 40261-0217
PO BOX 18218, LOUISVILLE, KY 40261-0218
PO BOX 18219, LOUISVILLE, KY 40261-0219
PO BOX 18220, LOUISVILLE, KY 40261-0220
PO BOX 18221, LOUISVILLE, KY 40261-0221
PO BOX 18222, LOUISVILLE, KY 40261-0222
PO BOX 18223, LOUISVILLE, KY 40261-0223
PO BOX 18224, LOUISVILLE, KY 40261-0224
PO BOX 18225, LOUISVILLE, KY 40261-0225
PO BOX 18226, LOUISVILLE, KY 40261-0226
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