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, FENTON, IA 50539-0001
PO BOX 2, FENTON, IA 50539-0002
PO BOX 3, FENTON, IA 50539-0003
PO BOX 4, FENTON, IA 50539-0004
PO BOX 5, FENTON, IA 50539-0005
PO BOX 6, FENTON, IA 50539-0006
PO BOX 7, FENTON, IA 50539-0007
PO BOX 8, FENTON, IA 50539-0008
PO BOX 9, FENTON, IA 50539-0009
PO BOX 10, FENTON, IA 50539-0010
PO BOX 11, FENTON, IA 50539-0011
PO BOX 12, FENTON, IA 50539-0012
PO BOX 13, FENTON, IA 50539-0013
PO BOX 14, FENTON, IA 50539-0014
PO BOX 15, FENTON, IA 50539-0015
PO BOX 16, FENTON, IA 50539-0016
PO BOX 17, FENTON, IA 50539-0017
PO BOX 18, FENTON, IA 50539-0018
PO BOX 19, FENTON, IA 50539-0019
PO BOX 20, FENTON, IA 50539-0020
PO BOX 21, FENTON, IA 50539-0021
PO BOX 22, FENTON, IA 50539-0022
PO BOX 23, FENTON, IA 50539-0023
PO BOX 24, FENTON, IA 50539-0024
PO BOX 25, FENTON, IA 50539-0025
PO BOX 26, FENTON, IA 50539-0026
PO BOX 27, FENTON, IA 50539-0027
PO BOX 28, FENTON, IA 50539-0028
PO BOX 29, FENTON, IA 50539-0029
PO BOX 30, FENTON, IA 50539-0030
PO BOX 31, FENTON, IA 50539-0031
PO BOX 32, FENTON, IA 50539-0032
PO BOX 33, FENTON, IA 50539-0033
PO BOX 34, FENTON, IA 50539-0034
PO BOX 35, FENTON, IA 50539-0035
PO BOX 36, FENTON, IA 50539-0036
PO BOX 37, FENTON, IA 50539-0037
PO BOX 38, FENTON, IA 50539-0038
PO BOX 39, FENTON, IA 50539-0039
PO BOX 40, FENTON, IA 50539-0040
PO BOX 41, FENTON, IA 50539-0041
PO BOX 42, FENTON, IA 50539-0042
PO BOX 43, FENTON, IA 50539-0043
PO BOX 44, FENTON, IA 50539-0044
PO BOX 45, FENTON, IA 50539-0045
PO BOX 46, FENTON, IA 50539-0046
PO BOX 47, FENTON, IA 50539-0047
PO BOX 48, FENTON, IA 50539-0048
PO BOX 49, FENTON, IA 50539-0049
PO BOX 50, FENTON, IA 50539-0050
PO BOX 51, FENTON, IA 50539-0051
PO BOX 52, FENTON, IA 50539-0052
PO BOX 53, FENTON, IA 50539-0053
PO BOX 54, FENTON, IA 50539-0054
PO BOX 55, FENTON, IA 50539-0055
PO BOX 56, FENTON, IA 50539-0056
PO BOX 57, FENTON, IA 50539-0057
PO BOX 58, FENTON, IA 50539-0058
PO BOX 59, FENTON, IA 50539-0059
PO BOX 60, FENTON, IA 50539-0060
PO BOX 61, FENTON, IA 50539-0061
PO BOX 62, FENTON, IA 50539-0062
PO BOX 63, FENTON, IA 50539-0063
PO BOX 64, FENTON, IA 50539-0064
PO BOX 65, FENTON, IA 50539-0065
PO BOX 66, FENTON, IA 50539-0066
PO BOX 67, FENTON, IA 50539-0067
PO BOX 68, FENTON, IA 50539-0068
PO BOX 69, FENTON, IA 50539-0069
PO BOX 70, FENTON, IA 50539-0070
PO BOX 71, FENTON, IA 50539-0071
PO BOX 72, FENTON, IA 50539-0072
PO BOX 73, FENTON, IA 50539-0073
PO BOX 74, FENTON, IA 50539-0074
PO BOX 75, FENTON, IA 50539-0075
PO BOX 76, FENTON, IA 50539-0076
PO BOX 77, FENTON, IA 50539-0077
PO BOX 78, FENTON, IA 50539-0078
PO BOX 79, FENTON, IA 50539-0079
PO BOX 80, FENTON, IA 50539-0080
PO BOX 81, FENTON, IA 50539-0081
PO BOX 82, FENTON, IA 50539-0082
PO BOX 83, FENTON, IA 50539-0083
PO BOX 84, FENTON, IA 50539-0084
PO BOX 85, FENTON, IA 50539-0085
PO BOX 86, FENTON, IA 50539-0086
PO BOX 87, FENTON, IA 50539-0087
PO BOX 88, FENTON, IA 50539-0088
PO BOX 89, FENTON, IA 50539-0089
PO BOX 90, FENTON, IA 50539-0090
PO BOX 91, FENTON, IA 50539-0091
PO BOX 92, FENTON, IA 50539-0092
PO BOX 93, FENTON, IA 50539-0093
PO BOX 94, FENTON, IA 50539-0094
PO BOX 95, FENTON, IA 50539-0095
PO BOX 96, FENTON, IA 50539-0096
PO BOX 97, FENTON, IA 50539-0097
PO BOX 98, FENTON, IA 50539-0098
PO BOX 99, FENTON, IA 50539-0099
PO BOX 100, FENTON, IA 50539-0100
PO BOX 101, FENTON, IA 50539-0101
PO BOX 102, FENTON, IA 50539-0102
PO BOX 103, FENTON, IA 50539-0103
PO BOX 104, FENTON, IA 50539-0104
PO BOX 105, FENTON, IA 50539-0105
PO BOX 106, FENTON, IA 50539-0106
PO BOX 107, FENTON, IA 50539-0107
PO BOX 108, FENTON, IA 50539-0108
PO BOX 109, FENTON, IA 50539-0109
PO BOX 110, FENTON, IA 50539-0110
PO BOX 111, FENTON, IA 50539-0111
PO BOX 112, FENTON, IA 50539-0112
PO BOX 113, FENTON, IA 50539-0113
PO BOX 114, FENTON, IA 50539-0114
PO BOX 115, FENTON, IA 50539-0115
PO BOX 116, FENTON, IA 50539-0116
PO BOX 117, FENTON, IA 50539-0117
PO BOX 118, FENTON, IA 50539-0118
PO BOX 119, FENTON, IA 50539-0119
PO BOX 120, FENTON, IA 50539-0120
PO BOX 121, FENTON, IA 50539-0121
PO BOX 122, FENTON, IA 50539-0122
PO BOX 123, FENTON, IA 50539-0123
PO BOX 124, FENTON, IA 50539-0124
PO BOX 125, FENTON, IA 50539-0125
PO BOX 126, FENTON, IA 50539-0126
PO BOX 127, FENTON, IA 50539-0127
PO BOX 128, FENTON, IA 50539-0128
PO BOX 129, FENTON, IA 50539-0129
PO BOX 130, FENTON, IA 50539-0130
PO BOX 131, FENTON, IA 50539-0131
PO BOX 132, FENTON, IA 50539-0132
PO BOX 133, FENTON, IA 50539-0133
PO BOX 134, FENTON, IA 50539-0134
PO BOX 135, FENTON, IA 50539-0135
PO BOX 136, FENTON, IA 50539-0136
PO BOX 137, FENTON, IA 50539-0137
PO BOX 138, FENTON, IA 50539-0138
PO BOX 139, FENTON, IA 50539-0139
PO BOX 140, FENTON, IA 50539-0140
PO BOX 141, FENTON, IA 50539-0141
PO BOX 142, FENTON, IA 50539-0142
PO BOX 143, FENTON, IA 50539-0143
PO BOX 144, FENTON, IA 50539-0144
PO BOX 145, FENTON, IA 50539-0145
PO BOX 146, FENTON, IA 50539-0146
PO BOX 147, FENTON, IA 50539-0147
PO BOX 148, FENTON, IA 50539-0148
PO BOX 149, FENTON, IA 50539-0149
PO BOX 150, FENTON, IA 50539-0150
PO BOX 151, FENTON, IA 50539-0151
PO BOX 152, FENTON, IA 50539-0152
PO BOX 153, FENTON, IA 50539-0153
PO BOX 154, FENTON, IA 50539-0154
PO BOX 155, FENTON, IA 50539-0155
PO BOX 156, FENTON, IA 50539-0156
PO BOX 157, FENTON, IA 50539-0157
PO BOX 158, FENTON, IA 50539-0158
PO BOX 159, FENTON, IA 50539-0159
PO BOX 160, FENTON, IA 50539-0160
PO BOX 161, FENTON, IA 50539-0161
PO BOX 162, FENTON, IA 50539-0162
PO BOX 163, FENTON, IA 50539-0163
PO BOX 164, FENTON, IA 50539-0164
PO BOX 165, FENTON, IA 50539-0165
PO BOX 166, FENTON, IA 50539-0166
PO BOX 167, FENTON, IA 50539-0167
PO BOX 168, FENTON, IA 50539-0168
PO BOX 169, FENTON, IA 50539-0169
PO BOX 170, FENTON, IA 50539-0170
PO BOX 171, FENTON, IA 50539-0171
PO BOX 172, FENTON, IA 50539-0172
PO BOX 173, FENTON, IA 50539-0173
PO BOX 174, FENTON, IA 50539-0174
PO BOX 175, FENTON, IA 50539-0175
PO BOX 176, FENTON, IA 50539-0176
PO BOX 177, FENTON, IA 50539-0177
PO BOX 178, FENTON, IA 50539-0178
PO BOX 179, FENTON, IA 50539-0179
PO BOX 180, FENTON, IA 50539-0180
PO BOX 181, FENTON, IA 50539-0181
PO BOX 182, FENTON, IA 50539-0182
PO BOX 183, FENTON, IA 50539-0183
PO BOX 184, FENTON, IA 50539-0184
PO BOX 185, FENTON, IA 50539-0185
PO BOX 186, FENTON, IA 50539-0186
PO BOX 187, FENTON, IA 50539-0187
PO BOX 188, FENTON, IA 50539-0188
PO BOX 189, FENTON, IA 50539-0189
PO BOX 190, FENTON, IA 50539-0190
PO BOX 191, FENTON, IA 50539-0191
PO BOX 192, FENTON, IA 50539-0192
PO BOX 193, FENTON, IA 50539-0193
PO BOX 194, FENTON, IA 50539-0194
PO BOX 195, FENTON, IA 50539-0195
PO BOX 196, FENTON, IA 50539-0196
PO BOX 197, FENTON, IA 50539-0197
PO BOX 198, FENTON, IA 50539-0198
PO BOX 199, FENTON, IA 50539-0199
PO BOX 200, FENTON, IA 50539-0200
PO BOX 201, FENTON, IA 50539-0201
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