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, WELLSBURG, IA 50680-0001
PO BOX 2, WELLSBURG, IA 50680-0002
PO BOX 3, WELLSBURG, IA 50680-0003
PO BOX 4, WELLSBURG, IA 50680-0004
PO BOX 5, WELLSBURG, IA 50680-0005
PO BOX 6, WELLSBURG, IA 50680-0006
PO BOX 7, WELLSBURG, IA 50680-0007
PO BOX 8, WELLSBURG, IA 50680-0008
PO BOX 9, WELLSBURG, IA 50680-0009
PO BOX 10, WELLSBURG, IA 50680-0010
PO BOX 11, WELLSBURG, IA 50680-0011
PO BOX 12, WELLSBURG, IA 50680-0012
PO BOX 13, WELLSBURG, IA 50680-0013
PO BOX 14, WELLSBURG, IA 50680-0014
PO BOX 15, WELLSBURG, IA 50680-0015
PO BOX 16, WELLSBURG, IA 50680-0016
PO BOX 17, WELLSBURG, IA 50680-0017
PO BOX 18, WELLSBURG, IA 50680-0018
PO BOX 19, WELLSBURG, IA 50680-0019
PO BOX 20, WELLSBURG, IA 50680-0020
PO BOX 21, WELLSBURG, IA 50680-0021
PO BOX 22, WELLSBURG, IA 50680-0022
PO BOX 23, WELLSBURG, IA 50680-0023
PO BOX 24, WELLSBURG, IA 50680-0024
PO BOX 25, WELLSBURG, IA 50680-0025
PO BOX 26, WELLSBURG, IA 50680-0026
PO BOX 27, WELLSBURG, IA 50680-0027
PO BOX 28, WELLSBURG, IA 50680-0028
PO BOX 29, WELLSBURG, IA 50680-0029
PO BOX 30, WELLSBURG, IA 50680-0030
PO BOX 31, WELLSBURG, IA 50680-0031
PO BOX 32, WELLSBURG, IA 50680-0032
PO BOX 33, WELLSBURG, IA 50680-0033
PO BOX 34, WELLSBURG, IA 50680-0034
PO BOX 35, WELLSBURG, IA 50680-0035
PO BOX 36, WELLSBURG, IA 50680-0036
PO BOX 37, WELLSBURG, IA 50680-0037
PO BOX 38, WELLSBURG, IA 50680-0038
PO BOX 39, WELLSBURG, IA 50680-0039
PO BOX 40, WELLSBURG, IA 50680-0040
PO BOX 41, WELLSBURG, IA 50680-0041
PO BOX 42, WELLSBURG, IA 50680-0042
PO BOX 43, WELLSBURG, IA 50680-0043
PO BOX 44, WELLSBURG, IA 50680-0044
PO BOX 45, WELLSBURG, IA 50680-0045
PO BOX 46, WELLSBURG, IA 50680-0046
PO BOX 47, WELLSBURG, IA 50680-0047
PO BOX 48, WELLSBURG, IA 50680-0048
PO BOX 49, WELLSBURG, IA 50680-0049
PO BOX 50, WELLSBURG, IA 50680-0050
PO BOX 51, WELLSBURG, IA 50680-0051
PO BOX 52, WELLSBURG, IA 50680-0052
PO BOX 53, WELLSBURG, IA 50680-0053
PO BOX 54, WELLSBURG, IA 50680-0054
PO BOX 55, WELLSBURG, IA 50680-0055
PO BOX 56, WELLSBURG, IA 50680-0056
PO BOX 57, WELLSBURG, IA 50680-0057
PO BOX 58, WELLSBURG, IA 50680-0058
PO BOX 59, WELLSBURG, IA 50680-0059
PO BOX 60, WELLSBURG, IA 50680-0060
PO BOX 61, WELLSBURG, IA 50680-0061
PO BOX 62, WELLSBURG, IA 50680-0062
PO BOX 63, WELLSBURG, IA 50680-0063
PO BOX 64, WELLSBURG, IA 50680-0064
PO BOX 65, WELLSBURG, IA 50680-0065
PO BOX 66, WELLSBURG, IA 50680-0066
PO BOX 67, WELLSBURG, IA 50680-0067
PO BOX 68, WELLSBURG, IA 50680-0068
PO BOX 69, WELLSBURG, IA 50680-0069
PO BOX 70, WELLSBURG, IA 50680-0070
PO BOX 71, WELLSBURG, IA 50680-0071
PO BOX 72, WELLSBURG, IA 50680-0072
PO BOX 73, WELLSBURG, IA 50680-0073
PO BOX 74, WELLSBURG, IA 50680-0074
PO BOX 75, WELLSBURG, IA 50680-0075
PO BOX 76, WELLSBURG, IA 50680-0076
PO BOX 77, WELLSBURG, IA 50680-0077
PO BOX 78, WELLSBURG, IA 50680-0078
PO BOX 79, WELLSBURG, IA 50680-0079
PO BOX 80, WELLSBURG, IA 50680-0080
PO BOX 81, WELLSBURG, IA 50680-0081
PO BOX 82, WELLSBURG, IA 50680-0082
PO BOX 83, WELLSBURG, IA 50680-0083
PO BOX 84, WELLSBURG, IA 50680-0084
PO BOX 85, WELLSBURG, IA 50680-0085
PO BOX 86, WELLSBURG, IA 50680-0086
PO BOX 87, WELLSBURG, IA 50680-0087
PO BOX 88, WELLSBURG, IA 50680-0088
PO BOX 89, WELLSBURG, IA 50680-0089
PO BOX 90, WELLSBURG, IA 50680-0090
PO BOX 91, WELLSBURG, IA 50680-0091
PO BOX 92, WELLSBURG, IA 50680-0092
PO BOX 93, WELLSBURG, IA 50680-0093
PO BOX 94, WELLSBURG, IA 50680-0094
PO BOX 95, WELLSBURG, IA 50680-0095
PO BOX 96, WELLSBURG, IA 50680-0096
PO BOX 97, WELLSBURG, IA 50680-0097
PO BOX 98, WELLSBURG, IA 50680-0098
PO BOX 99, WELLSBURG, IA 50680-0099
PO BOX 100, WELLSBURG, IA 50680-0100
PO BOX 101, WELLSBURG, IA 50680-0101
PO BOX 102, WELLSBURG, IA 50680-0102
PO BOX 103, WELLSBURG, IA 50680-0103
PO BOX 104, WELLSBURG, IA 50680-0104
PO BOX 105, WELLSBURG, IA 50680-0105
PO BOX 106, WELLSBURG, IA 50680-0106
PO BOX 107, WELLSBURG, IA 50680-0107
PO BOX 108, WELLSBURG, IA 50680-0108
PO BOX 109, WELLSBURG, IA 50680-0109
PO BOX 110, WELLSBURG, IA 50680-0110
PO BOX 111, WELLSBURG, IA 50680-0111
PO BOX 112, WELLSBURG, IA 50680-0112
PO BOX 113, WELLSBURG, IA 50680-0113
PO BOX 114, WELLSBURG, IA 50680-0114
PO BOX 115, WELLSBURG, IA 50680-0115
PO BOX 116, WELLSBURG, IA 50680-0116
PO BOX 117, WELLSBURG, IA 50680-0117
PO BOX 118, WELLSBURG, IA 50680-0118
PO BOX 119, WELLSBURG, IA 50680-0119
PO BOX 120, WELLSBURG, IA 50680-0120
PO BOX 121, WELLSBURG, IA 50680-0121
PO BOX 122, WELLSBURG, IA 50680-0122
PO BOX 123, WELLSBURG, IA 50680-0123
PO BOX 124, WELLSBURG, IA 50680-0124
PO BOX 125, WELLSBURG, IA 50680-0125
PO BOX 126, WELLSBURG, IA 50680-0126
PO BOX 127, WELLSBURG, IA 50680-0127
PO BOX 128, WELLSBURG, IA 50680-0128
PO BOX 129, WELLSBURG, IA 50680-0129
PO BOX 130, WELLSBURG, IA 50680-0130
PO BOX 131, WELLSBURG, IA 50680-0131
PO BOX 132, WELLSBURG, IA 50680-0132
PO BOX 133, WELLSBURG, IA 50680-0133
PO BOX 134, WELLSBURG, IA 50680-0134
PO BOX 135, WELLSBURG, IA 50680-0135
PO BOX 136, WELLSBURG, IA 50680-0136
PO BOX 137, WELLSBURG, IA 50680-0137
PO BOX 138, WELLSBURG, IA 50680-0138
PO BOX 139, WELLSBURG, IA 50680-0139
PO BOX 140, WELLSBURG, IA 50680-0140
PO BOX 141, WELLSBURG, IA 50680-0141
PO BOX 142, WELLSBURG, IA 50680-0142
PO BOX 143, WELLSBURG, IA 50680-0143
PO BOX 144, WELLSBURG, IA 50680-0144
PO BOX 145, WELLSBURG, IA 50680-0145
PO BOX 146, WELLSBURG, IA 50680-0146
PO BOX 147, WELLSBURG, IA 50680-0147
PO BOX 148, WELLSBURG, IA 50680-0148
PO BOX 149, WELLSBURG, IA 50680-0149
PO BOX 150, WELLSBURG, IA 50680-0150
PO BOX 151, WELLSBURG, IA 50680-0151
PO BOX 152, WELLSBURG, IA 50680-0152
PO BOX 153, WELLSBURG, IA 50680-0153
PO BOX 154, WELLSBURG, IA 50680-0154
PO BOX 155, WELLSBURG, IA 50680-0155
PO BOX 156, WELLSBURG, IA 50680-0156
PO BOX 157, WELLSBURG, IA 50680-0157
PO BOX 158, WELLSBURG, IA 50680-0158
PO BOX 159, WELLSBURG, IA 50680-0159
PO BOX 160, WELLSBURG, IA 50680-0160
PO BOX 161, WELLSBURG, IA 50680-0161
PO BOX 162, WELLSBURG, IA 50680-0162
PO BOX 163, WELLSBURG, IA 50680-0163
PO BOX 164, WELLSBURG, IA 50680-0164
PO BOX 165, WELLSBURG, IA 50680-0165
PO BOX 166, WELLSBURG, IA 50680-0166
PO BOX 167, WELLSBURG, IA 50680-0167
PO BOX 168, WELLSBURG, IA 50680-0168
PO BOX 169, WELLSBURG, IA 50680-0169
PO BOX 170, WELLSBURG, IA 50680-0170
PO BOX 171, WELLSBURG, IA 50680-0171
PO BOX 172, WELLSBURG, IA 50680-0172
PO BOX 173, WELLSBURG, IA 50680-0173
PO BOX 174, WELLSBURG, IA 50680-0174
PO BOX 175, WELLSBURG, IA 50680-0175
PO BOX 176, WELLSBURG, IA 50680-0176
PO BOX 177, WELLSBURG, IA 50680-0177
PO BOX 178, WELLSBURG, IA 50680-0178
PO BOX 179, WELLSBURG, IA 50680-0179
PO BOX 180, WELLSBURG, IA 50680-0180
PO BOX 181, WELLSBURG, IA 50680-0181
PO BOX 182, WELLSBURG, IA 50680-0182
PO BOX 183, WELLSBURG, IA 50680-0183
PO BOX 184, WELLSBURG, IA 50680-0184
PO BOX 185, WELLSBURG, IA 50680-0185
PO BOX 186, WELLSBURG, IA 50680-0186
PO BOX 187, WELLSBURG, IA 50680-0187
PO BOX 188, WELLSBURG, IA 50680-0188
PO BOX 189, WELLSBURG, IA 50680-0189
PO BOX 190, WELLSBURG, IA 50680-0190
PO BOX 191, WELLSBURG, IA 50680-0191
PO BOX 192, WELLSBURG, IA 50680-0192
PO BOX 193, WELLSBURG, IA 50680-0193
PO BOX 194, WELLSBURG, IA 50680-0194
PO BOX 195, WELLSBURG, IA 50680-0195
PO BOX 196, WELLSBURG, IA 50680-0196
PO BOX 197, WELLSBURG, IA 50680-0197
PO BOX 198, WELLSBURG, IA 50680-0198
PO BOX 199, WELLSBURG, IA 50680-0199
PO BOX 200, WELLSBURG, IA 50680-0200
PO BOX 201, WELLSBURG, IA 50680-0201
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