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, SIOUX RAPIDS, IA 50585-0001
PO BOX 2, SIOUX RAPIDS, IA 50585-0002
PO BOX 3, SIOUX RAPIDS, IA 50585-0003
PO BOX 4, SIOUX RAPIDS, IA 50585-0004
PO BOX 5, SIOUX RAPIDS, IA 50585-0005
PO BOX 6, SIOUX RAPIDS, IA 50585-0006
PO BOX 7, SIOUX RAPIDS, IA 50585-0007
PO BOX 8, SIOUX RAPIDS, IA 50585-0008
PO BOX 9, SIOUX RAPIDS, IA 50585-0009
PO BOX 10, SIOUX RAPIDS, IA 50585-0010
PO BOX 11, SIOUX RAPIDS, IA 50585-0011
PO BOX 12, SIOUX RAPIDS, IA 50585-0012
PO BOX 13, SIOUX RAPIDS, IA 50585-0013
PO BOX 14, SIOUX RAPIDS, IA 50585-0014
PO BOX 15, SIOUX RAPIDS, IA 50585-0015
PO BOX 16, SIOUX RAPIDS, IA 50585-0016
PO BOX 17, SIOUX RAPIDS, IA 50585-0017
PO BOX 18, SIOUX RAPIDS, IA 50585-0018
PO BOX 19, SIOUX RAPIDS, IA 50585-0019
PO BOX 20, SIOUX RAPIDS, IA 50585-0020
PO BOX 21, SIOUX RAPIDS, IA 50585-0021
PO BOX 22, SIOUX RAPIDS, IA 50585-0022
PO BOX 23, SIOUX RAPIDS, IA 50585-0023
PO BOX 24, SIOUX RAPIDS, IA 50585-0024
PO BOX 25, SIOUX RAPIDS, IA 50585-0025
PO BOX 26, SIOUX RAPIDS, IA 50585-0026
PO BOX 27, SIOUX RAPIDS, IA 50585-0027
PO BOX 28, SIOUX RAPIDS, IA 50585-0028
PO BOX 29, SIOUX RAPIDS, IA 50585-0029
PO BOX 30, SIOUX RAPIDS, IA 50585-0030
PO BOX 31, SIOUX RAPIDS, IA 50585-0031
PO BOX 32, SIOUX RAPIDS, IA 50585-0032
PO BOX 33, SIOUX RAPIDS, IA 50585-0033
PO BOX 34, SIOUX RAPIDS, IA 50585-0034
PO BOX 35, SIOUX RAPIDS, IA 50585-0035
PO BOX 36, SIOUX RAPIDS, IA 50585-0036
PO BOX 37, SIOUX RAPIDS, IA 50585-0037
PO BOX 38, SIOUX RAPIDS, IA 50585-0038
PO BOX 39, SIOUX RAPIDS, IA 50585-0039
PO BOX 40, SIOUX RAPIDS, IA 50585-0040
PO BOX 41, SIOUX RAPIDS, IA 50585-0041
PO BOX 42, SIOUX RAPIDS, IA 50585-0042
PO BOX 43, SIOUX RAPIDS, IA 50585-0043
PO BOX 44, SIOUX RAPIDS, IA 50585-0044
PO BOX 45, SIOUX RAPIDS, IA 50585-0045
PO BOX 46, SIOUX RAPIDS, IA 50585-0046
PO BOX 47, SIOUX RAPIDS, IA 50585-0047
PO BOX 48, SIOUX RAPIDS, IA 50585-0048
PO BOX 49, SIOUX RAPIDS, IA 50585-0049
PO BOX 50, SIOUX RAPIDS, IA 50585-0050
PO BOX 51, SIOUX RAPIDS, IA 50585-0051
PO BOX 52, SIOUX RAPIDS, IA 50585-0052
PO BOX 53, SIOUX RAPIDS, IA 50585-0053
PO BOX 54, SIOUX RAPIDS, IA 50585-0054
PO BOX 55, SIOUX RAPIDS, IA 50585-0055
PO BOX 56, SIOUX RAPIDS, IA 50585-0056
PO BOX 57, SIOUX RAPIDS, IA 50585-0057
PO BOX 58, SIOUX RAPIDS, IA 50585-0058
PO BOX 59, SIOUX RAPIDS, IA 50585-0059
PO BOX 60, SIOUX RAPIDS, IA 50585-0060
PO BOX 61, SIOUX RAPIDS, IA 50585-0061
PO BOX 62, SIOUX RAPIDS, IA 50585-0062
PO BOX 63, SIOUX RAPIDS, IA 50585-0063
PO BOX 64, SIOUX RAPIDS, IA 50585-0064
PO BOX 65, SIOUX RAPIDS, IA 50585-0065
PO BOX 66, SIOUX RAPIDS, IA 50585-0066
PO BOX 67, SIOUX RAPIDS, IA 50585-0067
PO BOX 68, SIOUX RAPIDS, IA 50585-0068
PO BOX 69, SIOUX RAPIDS, IA 50585-0069
PO BOX 70, SIOUX RAPIDS, IA 50585-0070
PO BOX 71, SIOUX RAPIDS, IA 50585-0071
PO BOX 72, SIOUX RAPIDS, IA 50585-0072
PO BOX 73, SIOUX RAPIDS, IA 50585-0073
PO BOX 74, SIOUX RAPIDS, IA 50585-0074
PO BOX 75, SIOUX RAPIDS, IA 50585-0075
PO BOX 76, SIOUX RAPIDS, IA 50585-0076
PO BOX 77, SIOUX RAPIDS, IA 50585-0077
PO BOX 78, SIOUX RAPIDS, IA 50585-0078
PO BOX 79, SIOUX RAPIDS, IA 50585-0079
PO BOX 80, SIOUX RAPIDS, IA 50585-0080
PO BOX 81, SIOUX RAPIDS, IA 50585-0081
PO BOX 82, SIOUX RAPIDS, IA 50585-0082
PO BOX 83, SIOUX RAPIDS, IA 50585-0083
PO BOX 84, SIOUX RAPIDS, IA 50585-0084
PO BOX 85, SIOUX RAPIDS, IA 50585-0085
PO BOX 86, SIOUX RAPIDS, IA 50585-0086
PO BOX 87, SIOUX RAPIDS, IA 50585-0087
PO BOX 88, SIOUX RAPIDS, IA 50585-0088
PO BOX 89, SIOUX RAPIDS, IA 50585-0089
PO BOX 90, SIOUX RAPIDS, IA 50585-0090
PO BOX 91, SIOUX RAPIDS, IA 50585-0091
PO BOX 92, SIOUX RAPIDS, IA 50585-0092
PO BOX 93, SIOUX RAPIDS, IA 50585-0093
PO BOX 94, SIOUX RAPIDS, IA 50585-0094
PO BOX 95, SIOUX RAPIDS, IA 50585-0095
PO BOX 96, SIOUX RAPIDS, IA 50585-0096
PO BOX 97, SIOUX RAPIDS, IA 50585-0097
PO BOX 98, SIOUX RAPIDS, IA 50585-0098
PO BOX 99, SIOUX RAPIDS, IA 50585-0099
PO BOX 100, SIOUX RAPIDS, IA 50585-0100
PO BOX 101, SIOUX RAPIDS, IA 50585-0101
PO BOX 102, SIOUX RAPIDS, IA 50585-0102
PO BOX 103, SIOUX RAPIDS, IA 50585-0103
PO BOX 104, SIOUX RAPIDS, IA 50585-0104
PO BOX 105, SIOUX RAPIDS, IA 50585-0105
PO BOX 106, SIOUX RAPIDS, IA 50585-0106
PO BOX 107, SIOUX RAPIDS, IA 50585-0107
PO BOX 108, SIOUX RAPIDS, IA 50585-0108
PO BOX 109, SIOUX RAPIDS, IA 50585-0109
PO BOX 110, SIOUX RAPIDS, IA 50585-0110
PO BOX 111, SIOUX RAPIDS, IA 50585-0111
PO BOX 112, SIOUX RAPIDS, IA 50585-0112
PO BOX 113, SIOUX RAPIDS, IA 50585-0113
PO BOX 114, SIOUX RAPIDS, IA 50585-0114
PO BOX 115, SIOUX RAPIDS, IA 50585-0115
PO BOX 116, SIOUX RAPIDS, IA 50585-0116
PO BOX 117, SIOUX RAPIDS, IA 50585-0117
PO BOX 118, SIOUX RAPIDS, IA 50585-0118
PO BOX 119, SIOUX RAPIDS, IA 50585-0119
PO BOX 120, SIOUX RAPIDS, IA 50585-0120
PO BOX 121, SIOUX RAPIDS, IA 50585-0121
PO BOX 122, SIOUX RAPIDS, IA 50585-0122
PO BOX 123, SIOUX RAPIDS, IA 50585-0123
PO BOX 124, SIOUX RAPIDS, IA 50585-0124
PO BOX 125, SIOUX RAPIDS, IA 50585-0125
PO BOX 126, SIOUX RAPIDS, IA 50585-0126
PO BOX 127, SIOUX RAPIDS, IA 50585-0127
PO BOX 128, SIOUX RAPIDS, IA 50585-0128
PO BOX 129, SIOUX RAPIDS, IA 50585-0129
PO BOX 130, SIOUX RAPIDS, IA 50585-0130
PO BOX 131, SIOUX RAPIDS, IA 50585-0131
PO BOX 132, SIOUX RAPIDS, IA 50585-0132
PO BOX 133, SIOUX RAPIDS, IA 50585-0133
PO BOX 134, SIOUX RAPIDS, IA 50585-0134
PO BOX 135, SIOUX RAPIDS, IA 50585-0135
PO BOX 136, SIOUX RAPIDS, IA 50585-0136
PO BOX 137, SIOUX RAPIDS, IA 50585-0137
PO BOX 138, SIOUX RAPIDS, IA 50585-0138
PO BOX 139, SIOUX RAPIDS, IA 50585-0139
PO BOX 140, SIOUX RAPIDS, IA 50585-0140
PO BOX 141, SIOUX RAPIDS, IA 50585-0141
PO BOX 142, SIOUX RAPIDS, IA 50585-0142
PO BOX 143, SIOUX RAPIDS, IA 50585-0143
PO BOX 144, SIOUX RAPIDS, IA 50585-0144
PO BOX 145, SIOUX RAPIDS, IA 50585-0145
PO BOX 146, SIOUX RAPIDS, IA 50585-0146
PO BOX 147, SIOUX RAPIDS, IA 50585-0147
PO BOX 148, SIOUX RAPIDS, IA 50585-0148
PO BOX 149, SIOUX RAPIDS, IA 50585-0149
PO BOX 150, SIOUX RAPIDS, IA 50585-0150
PO BOX 151, SIOUX RAPIDS, IA 50585-0151
PO BOX 152, SIOUX RAPIDS, IA 50585-0152
PO BOX 153, SIOUX RAPIDS, IA 50585-0153
PO BOX 154, SIOUX RAPIDS, IA 50585-0154
PO BOX 155, SIOUX RAPIDS, IA 50585-0155
PO BOX 156, SIOUX RAPIDS, IA 50585-0156
PO BOX 157, SIOUX RAPIDS, IA 50585-0157
PO BOX 158, SIOUX RAPIDS, IA 50585-0158
PO BOX 159, SIOUX RAPIDS, IA 50585-0159
PO BOX 160, SIOUX RAPIDS, IA 50585-0160
PO BOX 161, SIOUX RAPIDS, IA 50585-0161
PO BOX 162, SIOUX RAPIDS, IA 50585-0162
PO BOX 163, SIOUX RAPIDS, IA 50585-0163
PO BOX 164, SIOUX RAPIDS, IA 50585-0164
PO BOX 165, SIOUX RAPIDS, IA 50585-0165
PO BOX 166, SIOUX RAPIDS, IA 50585-0166
PO BOX 167, SIOUX RAPIDS, IA 50585-0167
PO BOX 168, SIOUX RAPIDS, IA 50585-0168
PO BOX 169, SIOUX RAPIDS, IA 50585-0169
PO BOX 170, SIOUX RAPIDS, IA 50585-0170
PO BOX 171, SIOUX RAPIDS, IA 50585-0171
PO BOX 172, SIOUX RAPIDS, IA 50585-0172
PO BOX 173, SIOUX RAPIDS, IA 50585-0173
PO BOX 174, SIOUX RAPIDS, IA 50585-0174
PO BOX 175, SIOUX RAPIDS, IA 50585-0175
PO BOX 176, SIOUX RAPIDS, IA 50585-0176
PO BOX 177, SIOUX RAPIDS, IA 50585-0177
PO BOX 178, SIOUX RAPIDS, IA 50585-0178
PO BOX 179, SIOUX RAPIDS, IA 50585-0179
PO BOX 180, SIOUX RAPIDS, IA 50585-0180
PO BOX 181, SIOUX RAPIDS, IA 50585-0181
PO BOX 182, SIOUX RAPIDS, IA 50585-0182
PO BOX 183, SIOUX RAPIDS, IA 50585-0183
PO BOX 184, SIOUX RAPIDS, IA 50585-0184
PO BOX 185, SIOUX RAPIDS, IA 50585-0185
PO BOX 186, SIOUX RAPIDS, IA 50585-0186
PO BOX 187, SIOUX RAPIDS, IA 50585-0187
PO BOX 188, SIOUX RAPIDS, IA 50585-0188
PO BOX 189, SIOUX RAPIDS, IA 50585-0189
PO BOX 190, SIOUX RAPIDS, IA 50585-0190
PO BOX 191, SIOUX RAPIDS, IA 50585-0191
PO BOX 192, SIOUX RAPIDS, IA 50585-0192
PO BOX 193, SIOUX RAPIDS, IA 50585-0193
PO BOX 194, SIOUX RAPIDS, IA 50585-0194
PO BOX 195, SIOUX RAPIDS, IA 50585-0195
PO BOX 196, SIOUX RAPIDS, IA 50585-0196
PO BOX 197, SIOUX RAPIDS, IA 50585-0197
PO BOX 198, SIOUX RAPIDS, IA 50585-0198
PO BOX 199, SIOUX RAPIDS, IA 50585-0199
PO BOX 200, SIOUX RAPIDS, IA 50585-0200
PO BOX 201, SIOUX RAPIDS, IA 50585-0201
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