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, FAIRBANK, IA 50629-0001
PO BOX 2, FAIRBANK, IA 50629-0002
PO BOX 3, FAIRBANK, IA 50629-0003
PO BOX 4, FAIRBANK, IA 50629-0004
PO BOX 5, FAIRBANK, IA 50629-0005
PO BOX 6, FAIRBANK, IA 50629-0006
PO BOX 7, FAIRBANK, IA 50629-0007
PO BOX 8, FAIRBANK, IA 50629-0008
PO BOX 9, FAIRBANK, IA 50629-0009
PO BOX 10, FAIRBANK, IA 50629-0010
PO BOX 11, FAIRBANK, IA 50629-0011
PO BOX 12, FAIRBANK, IA 50629-0012
PO BOX 13, FAIRBANK, IA 50629-0013
PO BOX 14, FAIRBANK, IA 50629-0014
PO BOX 15, FAIRBANK, IA 50629-0015
PO BOX 16, FAIRBANK, IA 50629-0016
PO BOX 17, FAIRBANK, IA 50629-0017
PO BOX 18, FAIRBANK, IA 50629-0018
PO BOX 19, FAIRBANK, IA 50629-0019
PO BOX 20, FAIRBANK, IA 50629-0020
PO BOX 21, FAIRBANK, IA 50629-0021
PO BOX 22, FAIRBANK, IA 50629-0022
PO BOX 23, FAIRBANK, IA 50629-0023
PO BOX 24, FAIRBANK, IA 50629-0024
PO BOX 25, FAIRBANK, IA 50629-0025
PO BOX 26, FAIRBANK, IA 50629-0026
PO BOX 27, FAIRBANK, IA 50629-0027
PO BOX 28, FAIRBANK, IA 50629-0028
PO BOX 29, FAIRBANK, IA 50629-0029
PO BOX 30, FAIRBANK, IA 50629-0030
PO BOX 31, FAIRBANK, IA 50629-0031
PO BOX 32, FAIRBANK, IA 50629-0032
PO BOX 33, FAIRBANK, IA 50629-0033
PO BOX 34, FAIRBANK, IA 50629-0034
PO BOX 35, FAIRBANK, IA 50629-0035
PO BOX 36, FAIRBANK, IA 50629-0036
PO BOX 37, FAIRBANK, IA 50629-0037
PO BOX 38, FAIRBANK, IA 50629-0038
PO BOX 39, FAIRBANK, IA 50629-0039
PO BOX 40, FAIRBANK, IA 50629-0040
PO BOX 41, FAIRBANK, IA 50629-0041
PO BOX 42, FAIRBANK, IA 50629-0042
PO BOX 43, FAIRBANK, IA 50629-0043
PO BOX 44, FAIRBANK, IA 50629-0044
PO BOX 45, FAIRBANK, IA 50629-0045
PO BOX 46, FAIRBANK, IA 50629-0046
PO BOX 47, FAIRBANK, IA 50629-0047
PO BOX 48, FAIRBANK, IA 50629-0048
PO BOX 49, FAIRBANK, IA 50629-0049
PO BOX 50, FAIRBANK, IA 50629-0050
PO BOX 51, FAIRBANK, IA 50629-0051
PO BOX 52, FAIRBANK, IA 50629-0052
PO BOX 53, FAIRBANK, IA 50629-0053
PO BOX 54, FAIRBANK, IA 50629-0054
PO BOX 55, FAIRBANK, IA 50629-0055
PO BOX 56, FAIRBANK, IA 50629-0056
PO BOX 57, FAIRBANK, IA 50629-0057
PO BOX 58, FAIRBANK, IA 50629-0058
PO BOX 59, FAIRBANK, IA 50629-0059
PO BOX 60, FAIRBANK, IA 50629-0060
PO BOX 61, FAIRBANK, IA 50629-0061
PO BOX 62, FAIRBANK, IA 50629-0062
PO BOX 63, FAIRBANK, IA 50629-0063
PO BOX 64, FAIRBANK, IA 50629-0064
PO BOX 65, FAIRBANK, IA 50629-0065
PO BOX 66, FAIRBANK, IA 50629-0066
PO BOX 67, FAIRBANK, IA 50629-0067
PO BOX 68, FAIRBANK, IA 50629-0068
PO BOX 69, FAIRBANK, IA 50629-0069
PO BOX 70, FAIRBANK, IA 50629-0070
PO BOX 71, FAIRBANK, IA 50629-0071
PO BOX 72, FAIRBANK, IA 50629-0072
PO BOX 73, FAIRBANK, IA 50629-0073
PO BOX 74, FAIRBANK, IA 50629-0074
PO BOX 75, FAIRBANK, IA 50629-0075
PO BOX 76, FAIRBANK, IA 50629-0076
PO BOX 77, FAIRBANK, IA 50629-0077
PO BOX 78, FAIRBANK, IA 50629-0078
PO BOX 79, FAIRBANK, IA 50629-0079
PO BOX 80, FAIRBANK, IA 50629-0080
PO BOX 81, FAIRBANK, IA 50629-0081
PO BOX 82, FAIRBANK, IA 50629-0082
PO BOX 83, FAIRBANK, IA 50629-0083
PO BOX 84, FAIRBANK, IA 50629-0084
PO BOX 85, FAIRBANK, IA 50629-0085
PO BOX 86, FAIRBANK, IA 50629-0086
PO BOX 87, FAIRBANK, IA 50629-0087
PO BOX 88, FAIRBANK, IA 50629-0088
PO BOX 89, FAIRBANK, IA 50629-0089
PO BOX 90, FAIRBANK, IA 50629-0090
PO BOX 91, FAIRBANK, IA 50629-0091
PO BOX 92, FAIRBANK, IA 50629-0092
PO BOX 93, FAIRBANK, IA 50629-0093
PO BOX 94, FAIRBANK, IA 50629-0094
PO BOX 95, FAIRBANK, IA 50629-0095
PO BOX 96, FAIRBANK, IA 50629-0096
PO BOX 97, FAIRBANK, IA 50629-0097
PO BOX 98, FAIRBANK, IA 50629-0098
PO BOX 99, FAIRBANK, IA 50629-0099
PO BOX 100, FAIRBANK, IA 50629-0100
PO BOX 101, FAIRBANK, IA 50629-0101
PO BOX 102, FAIRBANK, IA 50629-0102
PO BOX 103, FAIRBANK, IA 50629-0103
PO BOX 104, FAIRBANK, IA 50629-0104
PO BOX 105, FAIRBANK, IA 50629-0105
PO BOX 106, FAIRBANK, IA 50629-0106
PO BOX 107, FAIRBANK, IA 50629-0107
PO BOX 108, FAIRBANK, IA 50629-0108
PO BOX 109, FAIRBANK, IA 50629-0109
PO BOX 110, FAIRBANK, IA 50629-0110
PO BOX 111, FAIRBANK, IA 50629-0111
PO BOX 112, FAIRBANK, IA 50629-0112
PO BOX 113, FAIRBANK, IA 50629-0113
PO BOX 114, FAIRBANK, IA 50629-0114
PO BOX 115, FAIRBANK, IA 50629-0115
PO BOX 116, FAIRBANK, IA 50629-0116
PO BOX 117, FAIRBANK, IA 50629-0117
PO BOX 118, FAIRBANK, IA 50629-0118
PO BOX 119, FAIRBANK, IA 50629-0119
PO BOX 120, FAIRBANK, IA 50629-0120
PO BOX 121, FAIRBANK, IA 50629-0121
PO BOX 122, FAIRBANK, IA 50629-0122
PO BOX 123, FAIRBANK, IA 50629-0123
PO BOX 124, FAIRBANK, IA 50629-0124
PO BOX 125, FAIRBANK, IA 50629-0125
PO BOX 126, FAIRBANK, IA 50629-0126
PO BOX 127, FAIRBANK, IA 50629-0127
PO BOX 128, FAIRBANK, IA 50629-0128
PO BOX 129, FAIRBANK, IA 50629-0129
PO BOX 130, FAIRBANK, IA 50629-0130
PO BOX 131, FAIRBANK, IA 50629-0131
PO BOX 132, FAIRBANK, IA 50629-0132
PO BOX 133, FAIRBANK, IA 50629-0133
PO BOX 134, FAIRBANK, IA 50629-0134
PO BOX 135, FAIRBANK, IA 50629-0135
PO BOX 136, FAIRBANK, IA 50629-0136
PO BOX 137, FAIRBANK, IA 50629-0137
PO BOX 138, FAIRBANK, IA 50629-0138
PO BOX 139, FAIRBANK, IA 50629-0139
PO BOX 140, FAIRBANK, IA 50629-0140
PO BOX 141, FAIRBANK, IA 50629-0141
PO BOX 142, FAIRBANK, IA 50629-0142
PO BOX 143, FAIRBANK, IA 50629-0143
PO BOX 144, FAIRBANK, IA 50629-0144
PO BOX 145, FAIRBANK, IA 50629-0145
PO BOX 146, FAIRBANK, IA 50629-0146
PO BOX 147, FAIRBANK, IA 50629-0147
PO BOX 148, FAIRBANK, IA 50629-0148
PO BOX 149, FAIRBANK, IA 50629-0149
PO BOX 150, FAIRBANK, IA 50629-0150
PO BOX 151, FAIRBANK, IA 50629-0151
PO BOX 152, FAIRBANK, IA 50629-0152
PO BOX 153, FAIRBANK, IA 50629-0153
PO BOX 154, FAIRBANK, IA 50629-0154
PO BOX 155, FAIRBANK, IA 50629-0155
PO BOX 156, FAIRBANK, IA 50629-0156
PO BOX 157, FAIRBANK, IA 50629-0157
PO BOX 158, FAIRBANK, IA 50629-0158
PO BOX 159, FAIRBANK, IA 50629-0159
PO BOX 160, FAIRBANK, IA 50629-0160
PO BOX 161, FAIRBANK, IA 50629-0161
PO BOX 162, FAIRBANK, IA 50629-0162
PO BOX 163, FAIRBANK, IA 50629-0163
PO BOX 164, FAIRBANK, IA 50629-0164
PO BOX 165, FAIRBANK, IA 50629-0165
PO BOX 166, FAIRBANK, IA 50629-0166
PO BOX 167, FAIRBANK, IA 50629-0167
PO BOX 168, FAIRBANK, IA 50629-0168
PO BOX 169, FAIRBANK, IA 50629-0169
PO BOX 170, FAIRBANK, IA 50629-0170
PO BOX 171, FAIRBANK, IA 50629-0171
PO BOX 172, FAIRBANK, IA 50629-0172
PO BOX 173, FAIRBANK, IA 50629-0173
PO BOX 174, FAIRBANK, IA 50629-0174
PO BOX 175, FAIRBANK, IA 50629-0175
PO BOX 176, FAIRBANK, IA 50629-0176
PO BOX 177, FAIRBANK, IA 50629-0177
PO BOX 178, FAIRBANK, IA 50629-0178
PO BOX 179, FAIRBANK, IA 50629-0179
PO BOX 180, FAIRBANK, IA 50629-0180
PO BOX 181, FAIRBANK, IA 50629-0181
PO BOX 182, FAIRBANK, IA 50629-0182
PO BOX 183, FAIRBANK, IA 50629-0183
PO BOX 184, FAIRBANK, IA 50629-0184
PO BOX 185, FAIRBANK, IA 50629-0185
PO BOX 186, FAIRBANK, IA 50629-0186
PO BOX 187, FAIRBANK, IA 50629-0187
PO BOX 188, FAIRBANK, IA 50629-0188
PO BOX 189, FAIRBANK, IA 50629-0189
PO BOX 190, FAIRBANK, IA 50629-0190
PO BOX 191, FAIRBANK, IA 50629-0191
PO BOX 192, FAIRBANK, IA 50629-0192
PO BOX 193, FAIRBANK, IA 50629-0193
PO BOX 194, FAIRBANK, IA 50629-0194
PO BOX 195, FAIRBANK, IA 50629-0195
PO BOX 196, FAIRBANK, IA 50629-0196
PO BOX 197, FAIRBANK, IA 50629-0197
PO BOX 198, FAIRBANK, IA 50629-0198
PO BOX 199, FAIRBANK, IA 50629-0199
PO BOX 200, FAIRBANK, IA 50629-0200
PO BOX 201, FAIRBANK, IA 50629-0201
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