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 11, SIOUX CENTER, IA 51250-0011
PO BOX 12, SIOUX CENTER, IA 51250-0012
PO BOX 13, SIOUX CENTER, IA 51250-0013
PO BOX 14, SIOUX CENTER, IA 51250-0014
PO BOX 15, SIOUX CENTER, IA 51250-0015
PO BOX 16, SIOUX CENTER, IA 51250-0016
PO BOX 17, SIOUX CENTER, IA 51250-0017
PO BOX 18, SIOUX CENTER, IA 51250-0018
PO BOX 19, SIOUX CENTER, IA 51250-0019
PO BOX 20, SIOUX CENTER, IA 51250-0020
PO BOX 21, SIOUX CENTER, IA 51250-0021
PO BOX 22, SIOUX CENTER, IA 51250-0022
PO BOX 23, SIOUX CENTER, IA 51250-0023
PO BOX 24, SIOUX CENTER, IA 51250-0024
PO BOX 25, SIOUX CENTER, IA 51250-0025
PO BOX 26, SIOUX CENTER, IA 51250-0026
PO BOX 27, SIOUX CENTER, IA 51250-0027
PO BOX 28, SIOUX CENTER, IA 51250-0028
PO BOX 29, SIOUX CENTER, IA 51250-0029
PO BOX 30, SIOUX CENTER, IA 51250-0030
PO BOX 31, SIOUX CENTER, IA 51250-0031
PO BOX 32, SIOUX CENTER, IA 51250-0032
PO BOX 33, SIOUX CENTER, IA 51250-0033
PO BOX 34, SIOUX CENTER, IA 51250-0034
PO BOX 35, SIOUX CENTER, IA 51250-0035
PO BOX 36, SIOUX CENTER, IA 51250-0036
PO BOX 37, SIOUX CENTER, IA 51250-0037
PO BOX 38, SIOUX CENTER, IA 51250-0038
PO BOX 39, SIOUX CENTER, IA 51250-0039
PO BOX 40, SIOUX CENTER, IA 51250-0040
PO BOX 41, SIOUX CENTER, IA 51250-0041
PO BOX 42, SIOUX CENTER, IA 51250-0042
PO BOX 43, SIOUX CENTER, IA 51250-0043
PO BOX 44, SIOUX CENTER, IA 51250-0044
PO BOX 45, SIOUX CENTER, IA 51250-0045
PO BOX 46, SIOUX CENTER, IA 51250-0046
PO BOX 47, SIOUX CENTER, IA 51250-0047
PO BOX 48, SIOUX CENTER, IA 51250-0048
PO BOX 49, SIOUX CENTER, IA 51250-0049
PO BOX 50, SIOUX CENTER, IA 51250-0050
PO BOX 51, SIOUX CENTER, IA 51250-0051
PO BOX 52, SIOUX CENTER, IA 51250-0052
PO BOX 53, SIOUX CENTER, IA 51250-0053
PO BOX 54, SIOUX CENTER, IA 51250-0054
PO BOX 55, SIOUX CENTER, IA 51250-0055
PO BOX 56, SIOUX CENTER, IA 51250-0056
PO BOX 57, SIOUX CENTER, IA 51250-0057
PO BOX 58, SIOUX CENTER, IA 51250-0058
PO BOX 59, SIOUX CENTER, IA 51250-0059
PO BOX 60, SIOUX CENTER, IA 51250-0060
PO BOX 61, SIOUX CENTER, IA 51250-0061
PO BOX 62, SIOUX CENTER, IA 51250-0062
PO BOX 63, SIOUX CENTER, IA 51250-0063
PO BOX 64, SIOUX CENTER, IA 51250-0064
PO BOX 65, SIOUX CENTER, IA 51250-0065
PO BOX 66, SIOUX CENTER, IA 51250-0066
PO BOX 67, SIOUX CENTER, IA 51250-0067
PO BOX 68, SIOUX CENTER, IA 51250-0068
PO BOX 69, SIOUX CENTER, IA 51250-0069
PO BOX 70, SIOUX CENTER, IA 51250-0070
PO BOX 71, SIOUX CENTER, IA 51250-0071
PO BOX 72, SIOUX CENTER, IA 51250-0072
PO BOX 73, SIOUX CENTER, IA 51250-0073
PO BOX 74, SIOUX CENTER, IA 51250-0074
PO BOX 75, SIOUX CENTER, IA 51250-0075
PO BOX 76, SIOUX CENTER, IA 51250-0076
PO BOX 77, SIOUX CENTER, IA 51250-0077
PO BOX 78, SIOUX CENTER, IA 51250-0078
PO BOX 79, SIOUX CENTER, IA 51250-0079
PO BOX 80, SIOUX CENTER, IA 51250-0080
PO BOX 81, SIOUX CENTER, IA 51250-0081
PO BOX 82, SIOUX CENTER, IA 51250-0082
PO BOX 83, SIOUX CENTER, IA 51250-0083
PO BOX 84, SIOUX CENTER, IA 51250-0084
PO BOX 85, SIOUX CENTER, IA 51250-0085
PO BOX 86, SIOUX CENTER, IA 51250-0086
PO BOX 87, SIOUX CENTER, IA 51250-0087
PO BOX 88, SIOUX CENTER, IA 51250-0088
PO BOX 89, SIOUX CENTER, IA 51250-0089
PO BOX 90, SIOUX CENTER, IA 51250-0090
PO BOX 91, SIOUX CENTER, IA 51250-0091
PO BOX 92, SIOUX CENTER, IA 51250-0092
PO BOX 93, SIOUX CENTER, IA 51250-0093
PO BOX 94, SIOUX CENTER, IA 51250-0094
PO BOX 95, SIOUX CENTER, IA 51250-0095
PO BOX 96, SIOUX CENTER, IA 51250-0096
PO BOX 97, SIOUX CENTER, IA 51250-0097
PO BOX 98, SIOUX CENTER, IA 51250-0098
PO BOX 99, SIOUX CENTER, IA 51250-0099
PO BOX 100, SIOUX CENTER, IA 51250-0100
PO BOX 101, SIOUX CENTER, IA 51250-0101
PO BOX 102, SIOUX CENTER, IA 51250-0102
PO BOX 103, SIOUX CENTER, IA 51250-0103
PO BOX 104, SIOUX CENTER, IA 51250-0104
PO BOX 105, SIOUX CENTER, IA 51250-0105
PO BOX 106, SIOUX CENTER, IA 51250-0106
PO BOX 107, SIOUX CENTER, IA 51250-0107
PO BOX 108, SIOUX CENTER, IA 51250-0108
PO BOX 109, SIOUX CENTER, IA 51250-0109
PO BOX 110, SIOUX CENTER, IA 51250-0110
PO BOX 111, SIOUX CENTER, IA 51250-0111
PO BOX 112, SIOUX CENTER, IA 51250-0112
PO BOX 113, SIOUX CENTER, IA 51250-0113
PO BOX 114, SIOUX CENTER, IA 51250-0114
PO BOX 115, SIOUX CENTER, IA 51250-0115
PO BOX 116, SIOUX CENTER, IA 51250-0116
PO BOX 117, SIOUX CENTER, IA 51250-0117
PO BOX 118, SIOUX CENTER, IA 51250-0118
PO BOX 119, SIOUX CENTER, IA 51250-0119
PO BOX 120, SIOUX CENTER, IA 51250-0120
PO BOX 121, SIOUX CENTER, IA 51250-0121
PO BOX 122, SIOUX CENTER, IA 51250-0122
PO BOX 123, SIOUX CENTER, IA 51250-0123
PO BOX 124, SIOUX CENTER, IA 51250-0124
PO BOX 125, SIOUX CENTER, IA 51250-0125
PO BOX 126, SIOUX CENTER, IA 51250-0126
PO BOX 127, SIOUX CENTER, IA 51250-0127
PO BOX 128, SIOUX CENTER, IA 51250-0128
PO BOX 129, SIOUX CENTER, IA 51250-0129
PO BOX 130, SIOUX CENTER, IA 51250-0130
PO BOX 131, SIOUX CENTER, IA 51250-0131
PO BOX 132, SIOUX CENTER, IA 51250-0132
PO BOX 133, SIOUX CENTER, IA 51250-0133
PO BOX 134, SIOUX CENTER, IA 51250-0134
PO BOX 135, SIOUX CENTER, IA 51250-0135
PO BOX 136, SIOUX CENTER, IA 51250-0136
PO BOX 137, SIOUX CENTER, IA 51250-0137
PO BOX 138, SIOUX CENTER, IA 51250-0138
PO BOX 139, SIOUX CENTER, IA 51250-0139
PO BOX 140, SIOUX CENTER, IA 51250-0140
PO BOX 141, SIOUX CENTER, IA 51250-0141
PO BOX 142, SIOUX CENTER, IA 51250-0142
PO BOX 143, SIOUX CENTER, IA 51250-0143
PO BOX 144, SIOUX CENTER, IA 51250-0144
PO BOX 145, SIOUX CENTER, IA 51250-0145
PO BOX 146, SIOUX CENTER, IA 51250-0146
PO BOX 147, SIOUX CENTER, IA 51250-0147
PO BOX 148, SIOUX CENTER, IA 51250-0148
PO BOX 149, SIOUX CENTER, IA 51250-0149
PO BOX 150, SIOUX CENTER, IA 51250-0150
PO BOX 151, SIOUX CENTER, IA 51250-0151
PO BOX 152, SIOUX CENTER, IA 51250-0152
PO BOX 153, SIOUX CENTER, IA 51250-0153
PO BOX 154, SIOUX CENTER, IA 51250-0154
PO BOX 155, SIOUX CENTER, IA 51250-0155
PO BOX 156, SIOUX CENTER, IA 51250-0156
PO BOX 157, SIOUX CENTER, IA 51250-0157
PO BOX 158, SIOUX CENTER, IA 51250-0158
PO BOX 159, SIOUX CENTER, IA 51250-0159
PO BOX 160, SIOUX CENTER, IA 51250-0160
PO BOX 161, SIOUX CENTER, IA 51250-0161
PO BOX 162, SIOUX CENTER, IA 51250-0162
PO BOX 163, SIOUX CENTER, IA 51250-0163
PO BOX 164, SIOUX CENTER, IA 51250-0164
PO BOX 165, SIOUX CENTER, IA 51250-0165
PO BOX 166, SIOUX CENTER, IA 51250-0166
PO BOX 167, SIOUX CENTER, IA 51250-0167
PO BOX 168, SIOUX CENTER, IA 51250-0168
PO BOX 169, SIOUX CENTER, IA 51250-0169
PO BOX 170, SIOUX CENTER, IA 51250-0170
PO BOX 171, SIOUX CENTER, IA 51250-0171
PO BOX 172, SIOUX CENTER, IA 51250-0172
PO BOX 173, SIOUX CENTER, IA 51250-0173
PO BOX 174, SIOUX CENTER, IA 51250-0174
PO BOX 175, SIOUX CENTER, IA 51250-0175
PO BOX 176, SIOUX CENTER, IA 51250-0176
PO BOX 177, SIOUX CENTER, IA 51250-0177
PO BOX 178, SIOUX CENTER, IA 51250-0178
PO BOX 179, SIOUX CENTER, IA 51250-0179
PO BOX 180, SIOUX CENTER, IA 51250-0180
PO BOX 181, SIOUX CENTER, IA 51250-0181
PO BOX 182, SIOUX CENTER, IA 51250-0182
PO BOX 183, SIOUX CENTER, IA 51250-0183
PO BOX 184, SIOUX CENTER, IA 51250-0184
PO BOX 185, SIOUX CENTER, IA 51250-0185
PO BOX 186, SIOUX CENTER, IA 51250-0186
PO BOX 187, SIOUX CENTER, IA 51250-0187
PO BOX 188, SIOUX CENTER, IA 51250-0188
PO BOX 189, SIOUX CENTER, IA 51250-0189
PO BOX 190, SIOUX CENTER, IA 51250-0190
PO BOX 191, SIOUX CENTER, IA 51250-0191
PO BOX 192, SIOUX CENTER, IA 51250-0192
PO BOX 193, SIOUX CENTER, IA 51250-0193
PO BOX 194, SIOUX CENTER, IA 51250-0194
PO BOX 195, SIOUX CENTER, IA 51250-0195
PO BOX 196, SIOUX CENTER, IA 51250-0196
PO BOX 197, SIOUX CENTER, IA 51250-0197
PO BOX 198, SIOUX CENTER, IA 51250-0198
PO BOX 199, SIOUX CENTER, IA 51250-0199
PO BOX 200, SIOUX CENTER, IA 51250-0200
PO BOX 201, SIOUX CENTER, IA 51250-0201
PO BOX 202, SIOUX CENTER, IA 51250-0202
PO BOX 203, SIOUX CENTER, IA 51250-0203
PO BOX 204, SIOUX CENTER, IA 51250-0204
PO BOX 205, SIOUX CENTER, IA 51250-0205
PO BOX 206, SIOUX CENTER, IA 51250-0206
PO BOX 207, SIOUX CENTER, IA 51250-0207
PO BOX 208, SIOUX CENTER, IA 51250-0208
PO BOX 209, SIOUX CENTER, IA 51250-0209
PO BOX 210, SIOUX CENTER, IA 51250-0210
PO BOX 211, SIOUX CENTER, IA 51250-0211
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