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 21, DAKOTA CITY, IA 50529-0021
PO BOX 22, DAKOTA CITY, IA 50529-0022
PO BOX 23, DAKOTA CITY, IA 50529-0023
PO BOX 24, DAKOTA CITY, IA 50529-0024
PO BOX 25, DAKOTA CITY, IA 50529-0025
PO BOX 26, DAKOTA CITY, IA 50529-0026
PO BOX 27, DAKOTA CITY, IA 50529-0027
PO BOX 28, DAKOTA CITY, IA 50529-0028
PO BOX 29, DAKOTA CITY, IA 50529-0029
PO BOX 30, DAKOTA CITY, IA 50529-0030
PO BOX 31, DAKOTA CITY, IA 50529-0031
PO BOX 32, DAKOTA CITY, IA 50529-0032
PO BOX 33, DAKOTA CITY, IA 50529-0033
PO BOX 34, DAKOTA CITY, IA 50529-0034
PO BOX 35, DAKOTA CITY, IA 50529-0035
PO BOX 36, DAKOTA CITY, IA 50529-0036
PO BOX 37, DAKOTA CITY, IA 50529-0037
PO BOX 38, DAKOTA CITY, IA 50529-0038
PO BOX 39, DAKOTA CITY, IA 50529-0039
PO BOX 40, DAKOTA CITY, IA 50529-0040
PO BOX 41, DAKOTA CITY, IA 50529-0041
PO BOX 42, DAKOTA CITY, IA 50529-0042
PO BOX 43, DAKOTA CITY, IA 50529-0043
PO BOX 44, DAKOTA CITY, IA 50529-0044
PO BOX 45, DAKOTA CITY, IA 50529-0045
PO BOX 46, DAKOTA CITY, IA 50529-0046
PO BOX 47, DAKOTA CITY, IA 50529-0047
PO BOX 48, DAKOTA CITY, IA 50529-0048
PO BOX 49, DAKOTA CITY, IA 50529-0049
PO BOX 50, DAKOTA CITY, IA 50529-0050
PO BOX 51, DAKOTA CITY, IA 50529-0051
PO BOX 52, DAKOTA CITY, IA 50529-0052
PO BOX 53, DAKOTA CITY, IA 50529-0053
PO BOX 54, DAKOTA CITY, IA 50529-0054
PO BOX 55, DAKOTA CITY, IA 50529-0055
PO BOX 56, DAKOTA CITY, IA 50529-0056
PO BOX 57, DAKOTA CITY, IA 50529-0057
PO BOX 58, DAKOTA CITY, IA 50529-0058
PO BOX 59, DAKOTA CITY, IA 50529-0059
PO BOX 60, DAKOTA CITY, IA 50529-0060
PO BOX 61, DAKOTA CITY, IA 50529-0061
PO BOX 62, DAKOTA CITY, IA 50529-0062
PO BOX 63, DAKOTA CITY, IA 50529-0063
PO BOX 64, DAKOTA CITY, IA 50529-0064
PO BOX 65, DAKOTA CITY, IA 50529-0065
PO BOX 66, DAKOTA CITY, IA 50529-0066
PO BOX 67, DAKOTA CITY, IA 50529-0067
PO BOX 68, DAKOTA CITY, IA 50529-0068
PO BOX 69, DAKOTA CITY, IA 50529-0069
PO BOX 70, DAKOTA CITY, IA 50529-0070
PO BOX 71, DAKOTA CITY, IA 50529-0071
PO BOX 72, DAKOTA CITY, IA 50529-0072
PO BOX 73, DAKOTA CITY, IA 50529-0073
PO BOX 74, DAKOTA CITY, IA 50529-0074
PO BOX 75, DAKOTA CITY, IA 50529-0075
PO BOX 76, DAKOTA CITY, IA 50529-0076
PO BOX 77, DAKOTA CITY, IA 50529-0077
PO BOX 78, DAKOTA CITY, IA 50529-0078
PO BOX 79, DAKOTA CITY, IA 50529-0079
PO BOX 80, DAKOTA CITY, IA 50529-0080
PO BOX 81, DAKOTA CITY, IA 50529-0081
PO BOX 82, DAKOTA CITY, IA 50529-0082
PO BOX 83, DAKOTA CITY, IA 50529-0083
PO BOX 84, DAKOTA CITY, IA 50529-0084
PO BOX 85, DAKOTA CITY, IA 50529-0085
PO BOX 86, DAKOTA CITY, IA 50529-0086
PO BOX 87, DAKOTA CITY, IA 50529-0087
PO BOX 88, DAKOTA CITY, IA 50529-0088
PO BOX 89, DAKOTA CITY, IA 50529-0089
PO BOX 90, DAKOTA CITY, IA 50529-0090
PO BOX 91, DAKOTA CITY, IA 50529-0091
PO BOX 92, DAKOTA CITY, IA 50529-0092
PO BOX 93, DAKOTA CITY, IA 50529-0093
PO BOX 94, DAKOTA CITY, IA 50529-0094
PO BOX 95, DAKOTA CITY, IA 50529-0095
PO BOX 96, DAKOTA CITY, IA 50529-0096
PO BOX 97, DAKOTA CITY, IA 50529-0097
PO BOX 98, DAKOTA CITY, IA 50529-0098
PO BOX 99, DAKOTA CITY, IA 50529-0099
PO BOX 100, DAKOTA CITY, IA 50529-0100
PO BOX 101, DAKOTA CITY, IA 50529-0101
PO BOX 102, DAKOTA CITY, IA 50529-0102
PO BOX 103, DAKOTA CITY, IA 50529-0103
PO BOX 104, DAKOTA CITY, IA 50529-0104
PO BOX 105, DAKOTA CITY, IA 50529-0105
PO BOX 106, DAKOTA CITY, IA 50529-0106
PO BOX 107, DAKOTA CITY, IA 50529-0107
PO BOX 108, DAKOTA CITY, IA 50529-0108
PO BOX 109, DAKOTA CITY, IA 50529-0109
PO BOX 110, DAKOTA CITY, IA 50529-0110
PO BOX 111, DAKOTA CITY, IA 50529-0111
PO BOX 112, DAKOTA CITY, IA 50529-0112
PO BOX 113, DAKOTA CITY, IA 50529-0113
PO BOX 114, DAKOTA CITY, IA 50529-0114
PO BOX 115, DAKOTA CITY, IA 50529-0115
PO BOX 116, DAKOTA CITY, IA 50529-0116
PO BOX 117, DAKOTA CITY, IA 50529-0117
PO BOX 118, DAKOTA CITY, IA 50529-0118
PO BOX 119, DAKOTA CITY, IA 50529-0119
PO BOX 120, DAKOTA CITY, IA 50529-0120
PO BOX 121, DAKOTA CITY, IA 50529-0121
PO BOX 122, DAKOTA CITY, IA 50529-0122
PO BOX 123, DAKOTA CITY, IA 50529-0123
PO BOX 124, DAKOTA CITY, IA 50529-0124
PO BOX 125, DAKOTA CITY, IA 50529-0125
PO BOX 126, DAKOTA CITY, IA 50529-0126
PO BOX 127, DAKOTA CITY, IA 50529-0127
PO BOX 128, DAKOTA CITY, IA 50529-0128
PO BOX 129, DAKOTA CITY, IA 50529-0129
PO BOX 130, DAKOTA CITY, IA 50529-0130
PO BOX 131, DAKOTA CITY, IA 50529-0131
PO BOX 132, DAKOTA CITY, IA 50529-0132
PO BOX 133, DAKOTA CITY, IA 50529-0133
PO BOX 134, DAKOTA CITY, IA 50529-0134
PO BOX 135, DAKOTA CITY, IA 50529-0135
PO BOX 136, DAKOTA CITY, IA 50529-0136
PO BOX 137, DAKOTA CITY, IA 50529-0137
PO BOX 138, DAKOTA CITY, IA 50529-0138
PO BOX 139, DAKOTA CITY, IA 50529-0139
PO BOX 140, DAKOTA CITY, IA 50529-0140
PO BOX 141, DAKOTA CITY, IA 50529-0141
PO BOX 142, DAKOTA CITY, IA 50529-0142
PO BOX 143, DAKOTA CITY, IA 50529-0143
PO BOX 144, DAKOTA CITY, IA 50529-0144
PO BOX 145, DAKOTA CITY, IA 50529-0145
PO BOX 146, DAKOTA CITY, IA 50529-0146
PO BOX 147, DAKOTA CITY, IA 50529-0147
PO BOX 148, DAKOTA CITY, IA 50529-0148
PO BOX 149, DAKOTA CITY, IA 50529-0149
PO BOX 150, DAKOTA CITY, IA 50529-0150
PO BOX 151, DAKOTA CITY, IA 50529-0151
PO BOX 152, DAKOTA CITY, IA 50529-0152
PO BOX 153, DAKOTA CITY, IA 50529-0153
PO BOX 154, DAKOTA CITY, IA 50529-0154
PO BOX 155, DAKOTA CITY, IA 50529-0155
PO BOX 156, DAKOTA CITY, IA 50529-0156
PO BOX 157, DAKOTA CITY, IA 50529-0157
PO BOX 158, DAKOTA CITY, IA 50529-0158
PO BOX 159, DAKOTA CITY, IA 50529-0159
PO BOX 160, DAKOTA CITY, IA 50529-0160
PO BOX 161, DAKOTA CITY, IA 50529-0161
PO BOX 162, DAKOTA CITY, IA 50529-0162
PO BOX 163, DAKOTA CITY, IA 50529-0163
PO BOX 164, DAKOTA CITY, IA 50529-0164
PO BOX 165, DAKOTA CITY, IA 50529-0165
PO BOX 166, DAKOTA CITY, IA 50529-0166
PO BOX 167, DAKOTA CITY, IA 50529-0167
PO BOX 168, DAKOTA CITY, IA 50529-0168
PO BOX 169, DAKOTA CITY, IA 50529-0169
PO BOX 170, DAKOTA CITY, IA 50529-0170
PO BOX 171, DAKOTA CITY, IA 50529-0171
PO BOX 172, DAKOTA CITY, IA 50529-0172
PO BOX 173, DAKOTA CITY, IA 50529-0173
PO BOX 174, DAKOTA CITY, IA 50529-0174
PO BOX 175, DAKOTA CITY, IA 50529-0175
PO BOX 176, DAKOTA CITY, IA 50529-0176
PO BOX 177, DAKOTA CITY, IA 50529-0177
PO BOX 178, DAKOTA CITY, IA 50529-0178
PO BOX 179, DAKOTA CITY, IA 50529-0179
PO BOX 180, DAKOTA CITY, IA 50529-0180
PO BOX 181, DAKOTA CITY, IA 50529-0181
PO BOX 182, DAKOTA CITY, IA 50529-0182
PO BOX 183, DAKOTA CITY, IA 50529-0183
PO BOX 184, DAKOTA CITY, IA 50529-0184
PO BOX 185, DAKOTA CITY, IA 50529-0185
PO BOX 186, DAKOTA CITY, IA 50529-0186
PO BOX 187, DAKOTA CITY, IA 50529-0187
PO BOX 188, DAKOTA CITY, IA 50529-0188
PO BOX 189, DAKOTA CITY, IA 50529-0189
PO BOX 190, DAKOTA CITY, IA 50529-0190
PO BOX 191, DAKOTA CITY, IA 50529-0191
PO BOX 192, DAKOTA CITY, IA 50529-0192
PO BOX 193, DAKOTA CITY, IA 50529-0193
PO BOX 194, DAKOTA CITY, IA 50529-0194
PO BOX 195, DAKOTA CITY, IA 50529-0195
PO BOX 196, DAKOTA CITY, IA 50529-0196
PO BOX 197, DAKOTA CITY, IA 50529-0197
PO BOX 198, DAKOTA CITY, IA 50529-0198
PO BOX 199, DAKOTA CITY, IA 50529-0199
PO BOX 200, DAKOTA CITY, IA 50529-0200
PO BOX 201, DAKOTA CITY, IA 50529-0201
PO BOX 202, DAKOTA CITY, IA 50529-0202
PO BOX 203, DAKOTA CITY, IA 50529-0203
PO BOX 204, DAKOTA CITY, IA 50529-0204
PO BOX 205, DAKOTA CITY, IA 50529-0205
PO BOX 206, DAKOTA CITY, IA 50529-0206
PO BOX 207, DAKOTA CITY, IA 50529-0207
PO BOX 208, DAKOTA CITY, IA 50529-0208
PO BOX 209, DAKOTA CITY, IA 50529-0209
PO BOX 210, DAKOTA CITY, IA 50529-0210
PO BOX 211, DAKOTA CITY, IA 50529-0211
PO BOX 212, DAKOTA CITY, IA 50529-0212
PO BOX 213, DAKOTA CITY, IA 50529-0213
PO BOX 214, DAKOTA CITY, IA 50529-0214
PO BOX 215, DAKOTA CITY, IA 50529-0215
PO BOX 216, DAKOTA CITY, IA 50529-0216
PO BOX 217, DAKOTA CITY, IA 50529-0217
PO BOX 218, DAKOTA CITY, IA 50529-0218
PO BOX 219, DAKOTA CITY, IA 50529-0219
PO BOX 220, DAKOTA CITY, IA 50529-0220
PO BOX 221, DAKOTA CITY, IA 50529-0221
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