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 80000, LOUISVILLE, KY 40280-0002
PO BOX 80001, LOUISVILLE, KY 40280-0003
PO BOX 80002, LOUISVILLE, KY 40280-0004
PO BOX 80003, LOUISVILLE, KY 40280-0005
PO BOX 80004, LOUISVILLE, KY 40280-0006
PO BOX 80005, LOUISVILLE, KY 40280-0007
PO BOX 80006, LOUISVILLE, KY 40280-0008
PO BOX 80007, LOUISVILLE, KY 40280-0009
PO BOX 80008, LOUISVILLE, KY 40280-0010
PO BOX 80009, LOUISVILLE, KY 40280-0011
PO BOX 80010, LOUISVILLE, KY 40280-0012
PO BOX 80011, LOUISVILLE, KY 40280-0013
PO BOX 80012, LOUISVILLE, KY 40280-0014
PO BOX 80013, LOUISVILLE, KY 40280-0015
PO BOX 80014, LOUISVILLE, KY 40280-0016
PO BOX 80015, LOUISVILLE, KY 40280-0017
PO BOX 80016, LOUISVILLE, KY 40280-0018
PO BOX 80017, LOUISVILLE, KY 40280-0019
PO BOX 80018, LOUISVILLE, KY 40280-0020
PO BOX 80019, LOUISVILLE, KY 40280-0021
PO BOX 80020, LOUISVILLE, KY 40280-0022
PO BOX 80021, LOUISVILLE, KY 40280-0023
PO BOX 80022, LOUISVILLE, KY 40280-0024
PO BOX 80023, LOUISVILLE, KY 40280-0025
PO BOX 80024, LOUISVILLE, KY 40280-0026
PO BOX 80025, LOUISVILLE, KY 40280-0027
PO BOX 80026, LOUISVILLE, KY 40280-0028
PO BOX 80027, LOUISVILLE, KY 40280-0029
PO BOX 80028, LOUISVILLE, KY 40280-0030
PO BOX 80029, LOUISVILLE, KY 40280-0031
PO BOX 80030, LOUISVILLE, KY 40280-0032
PO BOX 80031, LOUISVILLE, KY 40280-0033
PO BOX 80032, LOUISVILLE, KY 40280-0034
PO BOX 80033, LOUISVILLE, KY 40280-0035
PO BOX 80034, LOUISVILLE, KY 40280-0036
PO BOX 80035, LOUISVILLE, KY 40280-0037
PO BOX 80036, LOUISVILLE, KY 40280-0038
PO BOX 80037, LOUISVILLE, KY 40280-0039
PO BOX 80038, LOUISVILLE, KY 40280-0040
PO BOX 80039, LOUISVILLE, KY 40280-0041
PO BOX 80040, LOUISVILLE, KY 40280-0042
PO BOX 80041, LOUISVILLE, KY 40280-0043
PO BOX 80042, LOUISVILLE, KY 40280-0044
PO BOX 80043, LOUISVILLE, KY 40280-0045
PO BOX 80044, LOUISVILLE, KY 40280-0046
PO BOX 80045, LOUISVILLE, KY 40280-0047
PO BOX 80046, LOUISVILLE, KY 40280-0048
PO BOX 80047, LOUISVILLE, KY 40280-0049
PO BOX 80048, LOUISVILLE, KY 40280-0050
PO BOX 80049, LOUISVILLE, KY 40280-0051
PO BOX 80050, LOUISVILLE, KY 40280-0052
PO BOX 80051, LOUISVILLE, KY 40280-0053
PO BOX 80052, LOUISVILLE, KY 40280-0054
PO BOX 80053, LOUISVILLE, KY 40280-0055
PO BOX 80054, LOUISVILLE, KY 40280-0056
PO BOX 80055, LOUISVILLE, KY 40280-0057
PO BOX 80056, LOUISVILLE, KY 40280-0058
PO BOX 80057, LOUISVILLE, KY 40280-0059
PO BOX 80058, LOUISVILLE, KY 40280-0060
PO BOX 80059, LOUISVILLE, KY 40280-0061
PO BOX 80060, LOUISVILLE, KY 40280-0062
PO BOX 80061, LOUISVILLE, KY 40280-0063
PO BOX 80062, LOUISVILLE, KY 40280-0064
PO BOX 80063, LOUISVILLE, KY 40280-0065
PO BOX 80064, LOUISVILLE, KY 40280-0066
PO BOX 80065, LOUISVILLE, KY 40280-0067
PO BOX 80066, LOUISVILLE, KY 40280-0068
PO BOX 80067, LOUISVILLE, KY 40280-0069
PO BOX 80068, LOUISVILLE, KY 40280-0070
PO BOX 80069, LOUISVILLE, KY 40280-0071
PO BOX 80070, LOUISVILLE, KY 40280-0072
PO BOX 80071, LOUISVILLE, KY 40280-0073
PO BOX 80072, LOUISVILLE, KY 40280-0074
PO BOX 80073, LOUISVILLE, KY 40280-0075
PO BOX 80074, LOUISVILLE, KY 40280-0076
PO BOX 80075, LOUISVILLE, KY 40280-0077
PO BOX 80076, LOUISVILLE, KY 40280-0078
PO BOX 80077, LOUISVILLE, KY 40280-0079
PO BOX 80078, LOUISVILLE, KY 40280-0080
PO BOX 80079, LOUISVILLE, KY 40280-0081
PO BOX 80080, LOUISVILLE, KY 40280-0082
PO BOX 80081, LOUISVILLE, KY 40280-0083
PO BOX 80082, LOUISVILLE, KY 40280-0084
PO BOX 80083, LOUISVILLE, KY 40280-0085
PO BOX 80084, LOUISVILLE, KY 40280-0086
PO BOX 80085, LOUISVILLE, KY 40280-0087
PO BOX 80086, LOUISVILLE, KY 40280-0088
PO BOX 80087, LOUISVILLE, KY 40280-0089
PO BOX 80088, LOUISVILLE, KY 40280-0090
PO BOX 80089, LOUISVILLE, KY 40280-0091
PO BOX 80090, LOUISVILLE, KY 40280-0092
PO BOX 80091, LOUISVILLE, KY 40280-0093
PO BOX 80092, LOUISVILLE, KY 40280-0094
PO BOX 80093, LOUISVILLE, KY 40280-0095
PO BOX 80094, LOUISVILLE, KY 40280-0096
PO BOX 80095, LOUISVILLE, KY 40280-0097
PO BOX 80096, LOUISVILLE, KY 40280-0098
PO BOX 80097, LOUISVILLE, KY 40280-0099
PO BOX 80098, LOUISVILLE, KY 40280-0100
PO BOX 80099, LOUISVILLE, KY 40280-0101
PO BOX 80100, LOUISVILLE, KY 40280-0102
PO BOX 80101, LOUISVILLE, KY 40280-0103
PO BOX 80102, LOUISVILLE, KY 40280-0104
PO BOX 80103, LOUISVILLE, KY 40280-0105
PO BOX 80104, LOUISVILLE, KY 40280-0106
PO BOX 80105, LOUISVILLE, KY 40280-0107
PO BOX 80106, LOUISVILLE, KY 40280-0108
PO BOX 80107, LOUISVILLE, KY 40280-0109
PO BOX 80108, LOUISVILLE, KY 40280-0110
PO BOX 80109, LOUISVILLE, KY 40280-0111
PO BOX 80110, LOUISVILLE, KY 40280-0112
PO BOX 80111, LOUISVILLE, KY 40280-0113
PO BOX 80112, LOUISVILLE, KY 40280-0114
PO BOX 80113, LOUISVILLE, KY 40280-0115
PO BOX 80114, LOUISVILLE, KY 40280-0116
PO BOX 80115, LOUISVILLE, KY 40280-0117
PO BOX 80116, LOUISVILLE, KY 40280-0118
PO BOX 80117, LOUISVILLE, KY 40280-0119
PO BOX 80118, LOUISVILLE, KY 40280-0120
PO BOX 80119, LOUISVILLE, KY 40280-0121
PO BOX 80120, LOUISVILLE, KY 40280-0122
PO BOX 80121, LOUISVILLE, KY 40280-0123
PO BOX 80122, LOUISVILLE, KY 40280-0124
PO BOX 80123, LOUISVILLE, KY 40280-0125
PO BOX 80124, LOUISVILLE, KY 40280-0126
PO BOX 80125, LOUISVILLE, KY 40280-0127
PO BOX 80126, LOUISVILLE, KY 40280-0128
PO BOX 80127, LOUISVILLE, KY 40280-0129
PO BOX 80128, LOUISVILLE, KY 40280-0130
PO BOX 80129, LOUISVILLE, KY 40280-0131
PO BOX 80130, LOUISVILLE, KY 40280-0132
PO BOX 80131, LOUISVILLE, KY 40280-0133
PO BOX 80132, LOUISVILLE, KY 40280-0134
PO BOX 80133, LOUISVILLE, KY 40280-0135
PO BOX 80134, LOUISVILLE, KY 40280-0136
PO BOX 80135, LOUISVILLE, KY 40280-0137
PO BOX 80136, LOUISVILLE, KY 40280-0138
PO BOX 80137, LOUISVILLE, KY 40280-0139
PO BOX 80138, LOUISVILLE, KY 40280-0140
PO BOX 80139, LOUISVILLE, KY 40280-0141
PO BOX 80140, LOUISVILLE, KY 40280-0142
PO BOX 80141, LOUISVILLE, KY 40280-0143
PO BOX 80142, LOUISVILLE, KY 40280-0144
PO BOX 80143, LOUISVILLE, KY 40280-0145
PO BOX 80144, LOUISVILLE, KY 40280-0146
PO BOX 80145, LOUISVILLE, KY 40280-0147
PO BOX 80146, LOUISVILLE, KY 40280-0148
PO BOX 80147, LOUISVILLE, KY 40280-0149
PO BOX 80148, LOUISVILLE, KY 40280-0150
PO BOX 80149, LOUISVILLE, KY 40280-0151
PO BOX 80150, LOUISVILLE, KY 40280-0152
PO BOX 80151, LOUISVILLE, KY 40280-0153
PO BOX 80152, LOUISVILLE, KY 40280-0154
PO BOX 80153, LOUISVILLE, KY 40280-0155
PO BOX 80154, LOUISVILLE, KY 40280-0156
PO BOX 80155, LOUISVILLE, KY 40280-0157
PO BOX 80156, LOUISVILLE, KY 40280-0158
PO BOX 80157, LOUISVILLE, KY 40280-0159
PO BOX 80158, LOUISVILLE, KY 40280-0160
PO BOX 80159, LOUISVILLE, KY 40280-0161
PO BOX 80160, LOUISVILLE, KY 40280-0162
PO BOX 80161, LOUISVILLE, KY 40280-0163
PO BOX 80162, LOUISVILLE, KY 40280-0164
PO BOX 80163, LOUISVILLE, KY 40280-0165
PO BOX 80164, LOUISVILLE, KY 40280-0166
PO BOX 80165, LOUISVILLE, KY 40280-0167
PO BOX 80166, LOUISVILLE, KY 40280-0168
PO BOX 80167, LOUISVILLE, KY 40280-0169
PO BOX 80168, LOUISVILLE, KY 40280-0170
PO BOX 80169, LOUISVILLE, KY 40280-0171
PO BOX 80170, LOUISVILLE, KY 40280-0172
PO BOX 80171, LOUISVILLE, KY 40280-0173
PO BOX 80172, LOUISVILLE, KY 40280-0174
PO BOX 80173, LOUISVILLE, KY 40280-0175
PO BOX 80174, LOUISVILLE, KY 40280-0176
PO BOX 80175, LOUISVILLE, KY 40280-0177
PO BOX 80176, LOUISVILLE, KY 40280-0178
PO BOX 80177, LOUISVILLE, KY 40280-0179
PO BOX 80178, LOUISVILLE, KY 40280-0180
PO BOX 80179, LOUISVILLE, KY 40280-0181
PO BOX 80180, LOUISVILLE, KY 40280-0182
PO BOX 80181, LOUISVILLE, KY 40280-0183
PO BOX 80182, LOUISVILLE, KY 40280-0184
PO BOX 80183, LOUISVILLE, KY 40280-0185
PO BOX 80184, LOUISVILLE, KY 40280-0186
PO BOX 80185, LOUISVILLE, KY 40280-0187
PO BOX 80186, LOUISVILLE, KY 40280-0188
PO BOX 80187, LOUISVILLE, KY 40280-0189
PO BOX 80188, LOUISVILLE, KY 40280-0190
PO BOX 80189, LOUISVILLE, KY 40280-0191
PO BOX 80190, LOUISVILLE, KY 40280-0192
PO BOX 80191, LOUISVILLE, KY 40280-0193
PO BOX 80192, LOUISVILLE, KY 40280-0194
PO BOX 80193, LOUISVILLE, KY 40280-0195
PO BOX 80194, LOUISVILLE, KY 40280-0196
PO BOX 80195, LOUISVILLE, KY 40280-0197
PO BOX 80196, LOUISVILLE, KY 40280-0198
PO BOX 80197, LOUISVILLE, KY 40280-0199
PO BOX 80198, LOUISVILLE, KY 40280-0200
PO BOX 80199, LOUISVILLE, KY 40280-0201
PO BOX 80200, LOUISVILLE, KY 40280-0202
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