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 1, JANESVILLE, IA 50647-0001
PO BOX 2, JANESVILLE, IA 50647-0002
PO BOX 3, JANESVILLE, IA 50647-0003
PO BOX 4, JANESVILLE, IA 50647-0004
PO BOX 5, JANESVILLE, IA 50647-0005
PO BOX 6, JANESVILLE, IA 50647-0006
PO BOX 7, JANESVILLE, IA 50647-0007
PO BOX 8, JANESVILLE, IA 50647-0008
PO BOX 9, JANESVILLE, IA 50647-0009
PO BOX 10, JANESVILLE, IA 50647-0010
PO BOX 11, JANESVILLE, IA 50647-0011
PO BOX 12, JANESVILLE, IA 50647-0012
PO BOX 13, JANESVILLE, IA 50647-0013
PO BOX 14, JANESVILLE, IA 50647-0014
PO BOX 15, JANESVILLE, IA 50647-0015
PO BOX 16, JANESVILLE, IA 50647-0016
PO BOX 17, JANESVILLE, IA 50647-0017
PO BOX 18, JANESVILLE, IA 50647-0018
PO BOX 19, JANESVILLE, IA 50647-0019
PO BOX 20, JANESVILLE, IA 50647-0020
PO BOX 21, JANESVILLE, IA 50647-0021
PO BOX 22, JANESVILLE, IA 50647-0022
PO BOX 23, JANESVILLE, IA 50647-0023
PO BOX 24, JANESVILLE, IA 50647-0024
PO BOX 25, JANESVILLE, IA 50647-0025
PO BOX 26, JANESVILLE, IA 50647-0026
PO BOX 27, JANESVILLE, IA 50647-0027
PO BOX 28, JANESVILLE, IA 50647-0028
PO BOX 29, JANESVILLE, IA 50647-0029
PO BOX 30, JANESVILLE, IA 50647-0030
PO BOX 31, JANESVILLE, IA 50647-0031
PO BOX 32, JANESVILLE, IA 50647-0032
PO BOX 33, JANESVILLE, IA 50647-0033
PO BOX 34, JANESVILLE, IA 50647-0034
PO BOX 35, JANESVILLE, IA 50647-0035
PO BOX 36, JANESVILLE, IA 50647-0036
PO BOX 37, JANESVILLE, IA 50647-0037
PO BOX 38, JANESVILLE, IA 50647-0038
PO BOX 39, JANESVILLE, IA 50647-0039
PO BOX 40, JANESVILLE, IA 50647-0040
PO BOX 41, JANESVILLE, IA 50647-0041
PO BOX 42, JANESVILLE, IA 50647-0042
PO BOX 43, JANESVILLE, IA 50647-0043
PO BOX 44, JANESVILLE, IA 50647-0044
PO BOX 45, JANESVILLE, IA 50647-0045
PO BOX 46, JANESVILLE, IA 50647-0046
PO BOX 47, JANESVILLE, IA 50647-0047
PO BOX 48, JANESVILLE, IA 50647-0048
PO BOX 49, JANESVILLE, IA 50647-0049
PO BOX 50, JANESVILLE, IA 50647-0050
PO BOX 51, JANESVILLE, IA 50647-0051
PO BOX 52, JANESVILLE, IA 50647-0052
PO BOX 53, JANESVILLE, IA 50647-0053
PO BOX 54, JANESVILLE, IA 50647-0054
PO BOX 55, JANESVILLE, IA 50647-0055
PO BOX 56, JANESVILLE, IA 50647-0056
PO BOX 57, JANESVILLE, IA 50647-0057
PO BOX 58, JANESVILLE, IA 50647-0058
PO BOX 59, JANESVILLE, IA 50647-0059
PO BOX 60, JANESVILLE, IA 50647-0060
PO BOX 61, JANESVILLE, IA 50647-0061
PO BOX 62, JANESVILLE, IA 50647-0062
PO BOX 63, JANESVILLE, IA 50647-0063
PO BOX 64, JANESVILLE, IA 50647-0064
PO BOX 65, JANESVILLE, IA 50647-0065
PO BOX 66, JANESVILLE, IA 50647-0066
PO BOX 67, JANESVILLE, IA 50647-0067
PO BOX 68, JANESVILLE, IA 50647-0068
PO BOX 69, JANESVILLE, IA 50647-0069
PO BOX 70, JANESVILLE, IA 50647-0070
PO BOX 71, JANESVILLE, IA 50647-0071
PO BOX 72, JANESVILLE, IA 50647-0072
PO BOX 73, JANESVILLE, IA 50647-0073
PO BOX 74, JANESVILLE, IA 50647-0074
PO BOX 75, JANESVILLE, IA 50647-0075
PO BOX 76, JANESVILLE, IA 50647-0076
PO BOX 77, JANESVILLE, IA 50647-0077
PO BOX 78, JANESVILLE, IA 50647-0078
PO BOX 79, JANESVILLE, IA 50647-0079
PO BOX 80, JANESVILLE, IA 50647-0080
PO BOX 81, JANESVILLE, IA 50647-0081
PO BOX 82, JANESVILLE, IA 50647-0082
PO BOX 83, JANESVILLE, IA 50647-0083
PO BOX 84, JANESVILLE, IA 50647-0084
PO BOX 85, JANESVILLE, IA 50647-0085
PO BOX 86, JANESVILLE, IA 50647-0086
PO BOX 87, JANESVILLE, IA 50647-0087
PO BOX 88, JANESVILLE, IA 50647-0088
PO BOX 89, JANESVILLE, IA 50647-0089
PO BOX 90, JANESVILLE, IA 50647-0090
PO BOX 91, JANESVILLE, IA 50647-0091
PO BOX 92, JANESVILLE, IA 50647-0092
PO BOX 93, JANESVILLE, IA 50647-0093
PO BOX 94, JANESVILLE, IA 50647-0094
PO BOX 95, JANESVILLE, IA 50647-0095
PO BOX 96, JANESVILLE, IA 50647-0096
PO BOX 97, JANESVILLE, IA 50647-0097
PO BOX 98, JANESVILLE, IA 50647-0098
PO BOX 99, JANESVILLE, IA 50647-0099
PO BOX 100, JANESVILLE, IA 50647-0100
PO BOX 101, JANESVILLE, IA 50647-0101
PO BOX 102, JANESVILLE, IA 50647-0102
PO BOX 103, JANESVILLE, IA 50647-0103
PO BOX 104, JANESVILLE, IA 50647-0104
PO BOX 105, JANESVILLE, IA 50647-0105
PO BOX 106, JANESVILLE, IA 50647-0106
PO BOX 107, JANESVILLE, IA 50647-0107
PO BOX 108, JANESVILLE, IA 50647-0108
PO BOX 109, JANESVILLE, IA 50647-0109
PO BOX 110, JANESVILLE, IA 50647-0110
PO BOX 111, JANESVILLE, IA 50647-0111
PO BOX 112, JANESVILLE, IA 50647-0112
PO BOX 113, JANESVILLE, IA 50647-0113
PO BOX 114, JANESVILLE, IA 50647-0114
PO BOX 115, JANESVILLE, IA 50647-0115
PO BOX 116, JANESVILLE, IA 50647-0116
PO BOX 117, JANESVILLE, IA 50647-0117
PO BOX 118, JANESVILLE, IA 50647-0118
PO BOX 119, JANESVILLE, IA 50647-0119
PO BOX 120, JANESVILLE, IA 50647-0120
PO BOX 121, JANESVILLE, IA 50647-0121
PO BOX 122, JANESVILLE, IA 50647-0122
PO BOX 123, JANESVILLE, IA 50647-0123
PO BOX 124, JANESVILLE, IA 50647-0124
PO BOX 125, JANESVILLE, IA 50647-0125
PO BOX 126, JANESVILLE, IA 50647-0126
PO BOX 127, JANESVILLE, IA 50647-0127
PO BOX 128, JANESVILLE, IA 50647-0128
PO BOX 129, JANESVILLE, IA 50647-0129
PO BOX 130, JANESVILLE, IA 50647-0130
PO BOX 131, JANESVILLE, IA 50647-0131
PO BOX 132, JANESVILLE, IA 50647-0132
PO BOX 133, JANESVILLE, IA 50647-0133
PO BOX 134, JANESVILLE, IA 50647-0134
PO BOX 135, JANESVILLE, IA 50647-0135
PO BOX 136, JANESVILLE, IA 50647-0136
PO BOX 137, JANESVILLE, IA 50647-0137
PO BOX 138, JANESVILLE, IA 50647-0138
PO BOX 139, JANESVILLE, IA 50647-0139
PO BOX 140, JANESVILLE, IA 50647-0140
PO BOX 141, JANESVILLE, IA 50647-0141
PO BOX 142, JANESVILLE, IA 50647-0142
PO BOX 143, JANESVILLE, IA 50647-0143
PO BOX 144, JANESVILLE, IA 50647-0144
PO BOX 145, JANESVILLE, IA 50647-0145
PO BOX 146, JANESVILLE, IA 50647-0146
PO BOX 147, JANESVILLE, IA 50647-0147
PO BOX 148, JANESVILLE, IA 50647-0148
PO BOX 149, JANESVILLE, IA 50647-0149
PO BOX 150, JANESVILLE, IA 50647-0150
PO BOX 151, JANESVILLE, IA 50647-0151
PO BOX 152, JANESVILLE, IA 50647-0152
PO BOX 153, JANESVILLE, IA 50647-0153
PO BOX 154, JANESVILLE, IA 50647-0154
PO BOX 155, JANESVILLE, IA 50647-0155
PO BOX 156, JANESVILLE, IA 50647-0156
PO BOX 157, JANESVILLE, IA 50647-0157
PO BOX 158, JANESVILLE, IA 50647-0158
PO BOX 159, JANESVILLE, IA 50647-0159
PO BOX 160, JANESVILLE, IA 50647-0160
PO BOX 161, JANESVILLE, IA 50647-0161
PO BOX 162, JANESVILLE, IA 50647-0162
PO BOX 163, JANESVILLE, IA 50647-0163
PO BOX 164, JANESVILLE, IA 50647-0164
PO BOX 165, JANESVILLE, IA 50647-0165
PO BOX 166, JANESVILLE, IA 50647-0166
PO BOX 167, JANESVILLE, IA 50647-0167
PO BOX 168, JANESVILLE, IA 50647-0168
PO BOX 169, JANESVILLE, IA 50647-0169
PO BOX 170, JANESVILLE, IA 50647-0170
PO BOX 171, JANESVILLE, IA 50647-0171
PO BOX 172, JANESVILLE, IA 50647-0172
PO BOX 173, JANESVILLE, IA 50647-0173
PO BOX 174, JANESVILLE, IA 50647-0174
PO BOX 175, JANESVILLE, IA 50647-0175
PO BOX 176, JANESVILLE, IA 50647-0176
PO BOX 177, JANESVILLE, IA 50647-0177
PO BOX 178, JANESVILLE, IA 50647-0178
PO BOX 179, JANESVILLE, IA 50647-0179
PO BOX 180, JANESVILLE, IA 50647-0180
PO BOX 181, JANESVILLE, IA 50647-0181
PO BOX 182, JANESVILLE, IA 50647-0182
PO BOX 183, JANESVILLE, IA 50647-0183
PO BOX 184, JANESVILLE, IA 50647-0184
PO BOX 185, JANESVILLE, IA 50647-0185
PO BOX 186, JANESVILLE, IA 50647-0186
PO BOX 187, JANESVILLE, IA 50647-0187
PO BOX 188, JANESVILLE, IA 50647-0188
PO BOX 189, JANESVILLE, IA 50647-0189
PO BOX 190, JANESVILLE, IA 50647-0190
PO BOX 191, JANESVILLE, IA 50647-0191
PO BOX 192, JANESVILLE, IA 50647-0192
PO BOX 193, JANESVILLE, IA 50647-0193
PO BOX 194, JANESVILLE, IA 50647-0194
PO BOX 195, JANESVILLE, IA 50647-0195
PO BOX 196, JANESVILLE, IA 50647-0196
PO BOX 197, JANESVILLE, IA 50647-0197
PO BOX 198, JANESVILLE, IA 50647-0198
PO BOX 199, JANESVILLE, IA 50647-0199
PO BOX 200, JANESVILLE, IA 50647-0200
PO BOX 201, JANESVILLE, IA 50647-0201
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