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, PETERSON, IA 51047-0001
PO BOX 2, PETERSON, IA 51047-0002
PO BOX 3, PETERSON, IA 51047-0003
PO BOX 4, PETERSON, IA 51047-0004
PO BOX 5, PETERSON, IA 51047-0005
PO BOX 6, PETERSON, IA 51047-0006
PO BOX 7, PETERSON, IA 51047-0007
PO BOX 8, PETERSON, IA 51047-0008
PO BOX 9, PETERSON, IA 51047-0009
PO BOX 10, PETERSON, IA 51047-0010
PO BOX 11, PETERSON, IA 51047-0011
PO BOX 12, PETERSON, IA 51047-0012
PO BOX 13, PETERSON, IA 51047-0013
PO BOX 14, PETERSON, IA 51047-0014
PO BOX 15, PETERSON, IA 51047-0015
PO BOX 16, PETERSON, IA 51047-0016
PO BOX 17, PETERSON, IA 51047-0017
PO BOX 18, PETERSON, IA 51047-0018
PO BOX 19, PETERSON, IA 51047-0019
PO BOX 20, PETERSON, IA 51047-0020
PO BOX 21, PETERSON, IA 51047-0021
PO BOX 22, PETERSON, IA 51047-0022
PO BOX 23, PETERSON, IA 51047-0023
PO BOX 24, PETERSON, IA 51047-0024
PO BOX 25, PETERSON, IA 51047-0025
PO BOX 26, PETERSON, IA 51047-0026
PO BOX 27, PETERSON, IA 51047-0027
PO BOX 28, PETERSON, IA 51047-0028
PO BOX 29, PETERSON, IA 51047-0029
PO BOX 30, PETERSON, IA 51047-0030
PO BOX 31, PETERSON, IA 51047-0031
PO BOX 32, PETERSON, IA 51047-0032
PO BOX 33, PETERSON, IA 51047-0033
PO BOX 34, PETERSON, IA 51047-0034
PO BOX 35, PETERSON, IA 51047-0035
PO BOX 36, PETERSON, IA 51047-0036
PO BOX 37, PETERSON, IA 51047-0037
PO BOX 38, PETERSON, IA 51047-0038
PO BOX 39, PETERSON, IA 51047-0039
PO BOX 40, PETERSON, IA 51047-0040
PO BOX 41, PETERSON, IA 51047-0041
PO BOX 42, PETERSON, IA 51047-0042
PO BOX 43, PETERSON, IA 51047-0043
PO BOX 44, PETERSON, IA 51047-0044
PO BOX 45, PETERSON, IA 51047-0045
PO BOX 46, PETERSON, IA 51047-0046
PO BOX 47, PETERSON, IA 51047-0047
PO BOX 48, PETERSON, IA 51047-0048
PO BOX 49, PETERSON, IA 51047-0049
PO BOX 50, PETERSON, IA 51047-0050
PO BOX 51, PETERSON, IA 51047-0051
PO BOX 52, PETERSON, IA 51047-0052
PO BOX 53, PETERSON, IA 51047-0053
PO BOX 54, PETERSON, IA 51047-0054
PO BOX 55, PETERSON, IA 51047-0055
PO BOX 56, PETERSON, IA 51047-0056
PO BOX 57, PETERSON, IA 51047-0057
PO BOX 58, PETERSON, IA 51047-0058
PO BOX 59, PETERSON, IA 51047-0059
PO BOX 60, PETERSON, IA 51047-0060
PO BOX 61, PETERSON, IA 51047-0061
PO BOX 62, PETERSON, IA 51047-0062
PO BOX 63, PETERSON, IA 51047-0063
PO BOX 64, PETERSON, IA 51047-0064
PO BOX 65, PETERSON, IA 51047-0065
PO BOX 66, PETERSON, IA 51047-0066
PO BOX 67, PETERSON, IA 51047-0067
PO BOX 68, PETERSON, IA 51047-0068
PO BOX 69, PETERSON, IA 51047-0069
PO BOX 70, PETERSON, IA 51047-0070
PO BOX 71, PETERSON, IA 51047-0071
PO BOX 72, PETERSON, IA 51047-0072
PO BOX 73, PETERSON, IA 51047-0073
PO BOX 74, PETERSON, IA 51047-0074
PO BOX 75, PETERSON, IA 51047-0075
PO BOX 76, PETERSON, IA 51047-0076
PO BOX 77, PETERSON, IA 51047-0077
PO BOX 78, PETERSON, IA 51047-0078
PO BOX 79, PETERSON, IA 51047-0079
PO BOX 80, PETERSON, IA 51047-0080
PO BOX 81, PETERSON, IA 51047-0081
PO BOX 82, PETERSON, IA 51047-0082
PO BOX 83, PETERSON, IA 51047-0083
PO BOX 84, PETERSON, IA 51047-0084
PO BOX 85, PETERSON, IA 51047-0085
PO BOX 86, PETERSON, IA 51047-0086
PO BOX 87, PETERSON, IA 51047-0087
PO BOX 88, PETERSON, IA 51047-0088
PO BOX 89, PETERSON, IA 51047-0089
PO BOX 90, PETERSON, IA 51047-0090
PO BOX 91, PETERSON, IA 51047-0091
PO BOX 92, PETERSON, IA 51047-0092
PO BOX 93, PETERSON, IA 51047-0093
PO BOX 94, PETERSON, IA 51047-0094
PO BOX 95, PETERSON, IA 51047-0095
PO BOX 96, PETERSON, IA 51047-0096
PO BOX 97, PETERSON, IA 51047-0097
PO BOX 98, PETERSON, IA 51047-0098
PO BOX 99, PETERSON, IA 51047-0099
PO BOX 100, PETERSON, IA 51047-0100
PO BOX 101, PETERSON, IA 51047-0101
PO BOX 102, PETERSON, IA 51047-0102
PO BOX 103, PETERSON, IA 51047-0103
PO BOX 104, PETERSON, IA 51047-0104
PO BOX 105, PETERSON, IA 51047-0105
PO BOX 106, PETERSON, IA 51047-0106
PO BOX 107, PETERSON, IA 51047-0107
PO BOX 108, PETERSON, IA 51047-0108
PO BOX 109, PETERSON, IA 51047-0109
PO BOX 110, PETERSON, IA 51047-0110
PO BOX 111, PETERSON, IA 51047-0111
PO BOX 112, PETERSON, IA 51047-0112
PO BOX 113, PETERSON, IA 51047-0113
PO BOX 114, PETERSON, IA 51047-0114
PO BOX 115, PETERSON, IA 51047-0115
PO BOX 116, PETERSON, IA 51047-0116
PO BOX 117, PETERSON, IA 51047-0117
PO BOX 118, PETERSON, IA 51047-0118
PO BOX 119, PETERSON, IA 51047-0119
PO BOX 120, PETERSON, IA 51047-0120
PO BOX 121, PETERSON, IA 51047-0121
PO BOX 122, PETERSON, IA 51047-0122
PO BOX 123, PETERSON, IA 51047-0123
PO BOX 124, PETERSON, IA 51047-0124
PO BOX 125, PETERSON, IA 51047-0125
PO BOX 126, PETERSON, IA 51047-0126
PO BOX 127, PETERSON, IA 51047-0127
PO BOX 128, PETERSON, IA 51047-0128
PO BOX 129, PETERSON, IA 51047-0129
PO BOX 130, PETERSON, IA 51047-0130
PO BOX 131, PETERSON, IA 51047-0131
PO BOX 132, PETERSON, IA 51047-0132
PO BOX 133, PETERSON, IA 51047-0133
PO BOX 134, PETERSON, IA 51047-0134
PO BOX 135, PETERSON, IA 51047-0135
PO BOX 136, PETERSON, IA 51047-0136
PO BOX 137, PETERSON, IA 51047-0137
PO BOX 138, PETERSON, IA 51047-0138
PO BOX 139, PETERSON, IA 51047-0139
PO BOX 140, PETERSON, IA 51047-0140
PO BOX 141, PETERSON, IA 51047-0141
PO BOX 142, PETERSON, IA 51047-0142
PO BOX 143, PETERSON, IA 51047-0143
PO BOX 144, PETERSON, IA 51047-0144
PO BOX 145, PETERSON, IA 51047-0145
PO BOX 146, PETERSON, IA 51047-0146
PO BOX 147, PETERSON, IA 51047-0147
PO BOX 148, PETERSON, IA 51047-0148
PO BOX 149, PETERSON, IA 51047-0149
PO BOX 150, PETERSON, IA 51047-0150
PO BOX 151, PETERSON, IA 51047-0151
PO BOX 152, PETERSON, IA 51047-0152
PO BOX 153, PETERSON, IA 51047-0153
PO BOX 154, PETERSON, IA 51047-0154
PO BOX 155, PETERSON, IA 51047-0155
PO BOX 156, PETERSON, IA 51047-0156
PO BOX 157, PETERSON, IA 51047-0157
PO BOX 158, PETERSON, IA 51047-0158
PO BOX 159, PETERSON, IA 51047-0159
PO BOX 160, PETERSON, IA 51047-0160
PO BOX 161, PETERSON, IA 51047-0161
PO BOX 162, PETERSON, IA 51047-0162
PO BOX 163, PETERSON, IA 51047-0163
PO BOX 164, PETERSON, IA 51047-0164
PO BOX 165, PETERSON, IA 51047-0165
PO BOX 166, PETERSON, IA 51047-0166
PO BOX 167, PETERSON, IA 51047-0167
PO BOX 168, PETERSON, IA 51047-0168
PO BOX 169, PETERSON, IA 51047-0169
PO BOX 170, PETERSON, IA 51047-0170
PO BOX 171, PETERSON, IA 51047-0171
PO BOX 172, PETERSON, IA 51047-0172
PO BOX 173, PETERSON, IA 51047-0173
PO BOX 174, PETERSON, IA 51047-0174
PO BOX 175, PETERSON, IA 51047-0175
PO BOX 176, PETERSON, IA 51047-0176
PO BOX 177, PETERSON, IA 51047-0177
PO BOX 178, PETERSON, IA 51047-0178
PO BOX 179, PETERSON, IA 51047-0179
PO BOX 180, PETERSON, IA 51047-0180
PO BOX 181, PETERSON, IA 51047-0181
PO BOX 182, PETERSON, IA 51047-0182
PO BOX 183, PETERSON, IA 51047-0183
PO BOX 184, PETERSON, IA 51047-0184
PO BOX 185, PETERSON, IA 51047-0185
PO BOX 186, PETERSON, IA 51047-0186
PO BOX 187, PETERSON, IA 51047-0187
PO BOX 188, PETERSON, IA 51047-0188
PO BOX 189, PETERSON, IA 51047-0189
PO BOX 190, PETERSON, IA 51047-0190
PO BOX 191, PETERSON, IA 51047-0191
PO BOX 192, PETERSON, IA 51047-0192
PO BOX 193, PETERSON, IA 51047-0193
PO BOX 194, PETERSON, IA 51047-0194
PO BOX 195, PETERSON, IA 51047-0195
PO BOX 196, PETERSON, IA 51047-0196
PO BOX 197, PETERSON, IA 51047-0197
PO BOX 198, PETERSON, IA 51047-0198
PO BOX 199, PETERSON, IA 51047-0199
PO BOX 200, PETERSON, IA 51047-0200
PO BOX 201, PETERSON, IA 51047-0201
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