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, SUPERIOR, IA 51363-0011
PO BOX 12, SUPERIOR, IA 51363-0012
PO BOX 13, SUPERIOR, IA 51363-0013
PO BOX 14, SUPERIOR, IA 51363-0014
PO BOX 15, SUPERIOR, IA 51363-0015
PO BOX 16, SUPERIOR, IA 51363-0016
PO BOX 17, SUPERIOR, IA 51363-0017
PO BOX 18, SUPERIOR, IA 51363-0018
PO BOX 19, SUPERIOR, IA 51363-0019
PO BOX 20, SUPERIOR, IA 51363-0020
PO BOX 21, SUPERIOR, IA 51363-0021
PO BOX 22, SUPERIOR, IA 51363-0022
PO BOX 23, SUPERIOR, IA 51363-0023
PO BOX 24, SUPERIOR, IA 51363-0024
PO BOX 25, SUPERIOR, IA 51363-0025
PO BOX 26, SUPERIOR, IA 51363-0026
PO BOX 27, SUPERIOR, IA 51363-0027
PO BOX 28, SUPERIOR, IA 51363-0028
PO BOX 29, SUPERIOR, IA 51363-0029
PO BOX 30, SUPERIOR, IA 51363-0030
PO BOX 31, SUPERIOR, IA 51363-0031
PO BOX 32, SUPERIOR, IA 51363-0032
PO BOX 33, SUPERIOR, IA 51363-0033
PO BOX 34, SUPERIOR, IA 51363-0034
PO BOX 35, SUPERIOR, IA 51363-0035
PO BOX 36, SUPERIOR, IA 51363-0036
PO BOX 37, SUPERIOR, IA 51363-0037
PO BOX 38, SUPERIOR, IA 51363-0038
PO BOX 39, SUPERIOR, IA 51363-0039
PO BOX 40, SUPERIOR, IA 51363-0040
PO BOX 41, SUPERIOR, IA 51363-0041
PO BOX 42, SUPERIOR, IA 51363-0042
PO BOX 43, SUPERIOR, IA 51363-0043
PO BOX 44, SUPERIOR, IA 51363-0044
PO BOX 45, SUPERIOR, IA 51363-0045
PO BOX 46, SUPERIOR, IA 51363-0046
PO BOX 47, SUPERIOR, IA 51363-0047
PO BOX 48, SUPERIOR, IA 51363-0048
PO BOX 49, SUPERIOR, IA 51363-0049
PO BOX 50, SUPERIOR, IA 51363-0050
PO BOX 51, SUPERIOR, IA 51363-0051
PO BOX 52, SUPERIOR, IA 51363-0052
PO BOX 53, SUPERIOR, IA 51363-0053
PO BOX 54, SUPERIOR, IA 51363-0054
PO BOX 55, SUPERIOR, IA 51363-0055
PO BOX 56, SUPERIOR, IA 51363-0056
PO BOX 57, SUPERIOR, IA 51363-0057
PO BOX 58, SUPERIOR, IA 51363-0058
PO BOX 59, SUPERIOR, IA 51363-0059
PO BOX 60, SUPERIOR, IA 51363-0060
PO BOX 61, SUPERIOR, IA 51363-0061
PO BOX 62, SUPERIOR, IA 51363-0062
PO BOX 63, SUPERIOR, IA 51363-0063
PO BOX 64, SUPERIOR, IA 51363-0064
PO BOX 65, SUPERIOR, IA 51363-0065
PO BOX 66, SUPERIOR, IA 51363-0066
PO BOX 67, SUPERIOR, IA 51363-0067
PO BOX 68, SUPERIOR, IA 51363-0068
PO BOX 69, SUPERIOR, IA 51363-0069
PO BOX 70, SUPERIOR, IA 51363-0070
PO BOX 71, SUPERIOR, IA 51363-0071
PO BOX 72, SUPERIOR, IA 51363-0072
PO BOX 73, SUPERIOR, IA 51363-0073
PO BOX 74, SUPERIOR, IA 51363-0074
PO BOX 75, SUPERIOR, IA 51363-0075
PO BOX 76, SUPERIOR, IA 51363-0076
PO BOX 77, SUPERIOR, IA 51363-0077
PO BOX 78, SUPERIOR, IA 51363-0078
PO BOX 79, SUPERIOR, IA 51363-0079
PO BOX 80, SUPERIOR, IA 51363-0080
PO BOX 81, SUPERIOR, IA 51363-0081
PO BOX 82, SUPERIOR, IA 51363-0082
PO BOX 83, SUPERIOR, IA 51363-0083
PO BOX 84, SUPERIOR, IA 51363-0084
PO BOX 85, SUPERIOR, IA 51363-0085
PO BOX 86, SUPERIOR, IA 51363-0086
PO BOX 87, SUPERIOR, IA 51363-0087
PO BOX 88, SUPERIOR, IA 51363-0088
PO BOX 89, SUPERIOR, IA 51363-0089
PO BOX 90, SUPERIOR, IA 51363-0090
PO BOX 91, SUPERIOR, IA 51363-0091
PO BOX 92, SUPERIOR, IA 51363-0092
PO BOX 93, SUPERIOR, IA 51363-0093
PO BOX 94, SUPERIOR, IA 51363-0094
PO BOX 95, SUPERIOR, IA 51363-0095
PO BOX 96, SUPERIOR, IA 51363-0096
PO BOX 97, SUPERIOR, IA 51363-0097
PO BOX 98, SUPERIOR, IA 51363-0098
PO BOX 99, SUPERIOR, IA 51363-0099
PO BOX 100, SUPERIOR, IA 51363-0100
PO BOX 101, SUPERIOR, IA 51363-0101
PO BOX 102, SUPERIOR, IA 51363-0102
PO BOX 103, SUPERIOR, IA 51363-0103
PO BOX 104, SUPERIOR, IA 51363-0104
PO BOX 105, SUPERIOR, IA 51363-0105
PO BOX 106, SUPERIOR, IA 51363-0106
PO BOX 107, SUPERIOR, IA 51363-0107
PO BOX 108, SUPERIOR, IA 51363-0108
PO BOX 109, SUPERIOR, IA 51363-0109
PO BOX 110, SUPERIOR, IA 51363-0110
PO BOX 111, SUPERIOR, IA 51363-0111
PO BOX 112, SUPERIOR, IA 51363-0112
PO BOX 113, SUPERIOR, IA 51363-0113
PO BOX 114, SUPERIOR, IA 51363-0114
PO BOX 115, SUPERIOR, IA 51363-0115
PO BOX 116, SUPERIOR, IA 51363-0116
PO BOX 117, SUPERIOR, IA 51363-0117
PO BOX 118, SUPERIOR, IA 51363-0118
PO BOX 119, SUPERIOR, IA 51363-0119
PO BOX 120, SUPERIOR, IA 51363-0120
PO BOX 121, SUPERIOR, IA 51363-0121
PO BOX 122, SUPERIOR, IA 51363-0122
PO BOX 123, SUPERIOR, IA 51363-0123
PO BOX 124, SUPERIOR, IA 51363-0124
PO BOX 125, SUPERIOR, IA 51363-0125
PO BOX 126, SUPERIOR, IA 51363-0126
PO BOX 127, SUPERIOR, IA 51363-0127
PO BOX 128, SUPERIOR, IA 51363-0128
PO BOX 129, SUPERIOR, IA 51363-0129
PO BOX 130, SUPERIOR, IA 51363-0130
PO BOX 131, SUPERIOR, IA 51363-0131
PO BOX 132, SUPERIOR, IA 51363-0132
PO BOX 133, SUPERIOR, IA 51363-0133
PO BOX 134, SUPERIOR, IA 51363-0134
PO BOX 135, SUPERIOR, IA 51363-0135
PO BOX 136, SUPERIOR, IA 51363-0136
PO BOX 137, SUPERIOR, IA 51363-0137
PO BOX 138, SUPERIOR, IA 51363-0138
PO BOX 139, SUPERIOR, IA 51363-0139
PO BOX 140, SUPERIOR, IA 51363-0140
PO BOX 141, SUPERIOR, IA 51363-0141
PO BOX 142, SUPERIOR, IA 51363-0142
PO BOX 143, SUPERIOR, IA 51363-0143
PO BOX 144, SUPERIOR, IA 51363-0144
PO BOX 145, SUPERIOR, IA 51363-0145
PO BOX 146, SUPERIOR, IA 51363-0146
PO BOX 147, SUPERIOR, IA 51363-0147
PO BOX 148, SUPERIOR, IA 51363-0148
PO BOX 149, SUPERIOR, IA 51363-0149
PO BOX 150, SUPERIOR, IA 51363-0150
PO BOX 151, SUPERIOR, IA 51363-0151
PO BOX 152, SUPERIOR, IA 51363-0152
PO BOX 153, SUPERIOR, IA 51363-0153
PO BOX 154, SUPERIOR, IA 51363-0154
PO BOX 155, SUPERIOR, IA 51363-0155
PO BOX 156, SUPERIOR, IA 51363-0156
PO BOX 157, SUPERIOR, IA 51363-0157
PO BOX 158, SUPERIOR, IA 51363-0158
PO BOX 159, SUPERIOR, IA 51363-0159
PO BOX 160, SUPERIOR, IA 51363-0160
PO BOX 161, SUPERIOR, IA 51363-0161
PO BOX 162, SUPERIOR, IA 51363-0162
PO BOX 163, SUPERIOR, IA 51363-0163
PO BOX 164, SUPERIOR, IA 51363-0164
PO BOX 165, SUPERIOR, IA 51363-0165
PO BOX 166, SUPERIOR, IA 51363-0166
PO BOX 167, SUPERIOR, IA 51363-0167
PO BOX 168, SUPERIOR, IA 51363-0168
PO BOX 169, SUPERIOR, IA 51363-0169
PO BOX 170, SUPERIOR, IA 51363-0170
PO BOX 171, SUPERIOR, IA 51363-0171
PO BOX 172, SUPERIOR, IA 51363-0172
PO BOX 173, SUPERIOR, IA 51363-0173
PO BOX 174, SUPERIOR, IA 51363-0174
PO BOX 175, SUPERIOR, IA 51363-0175
PO BOX 176, SUPERIOR, IA 51363-0176
PO BOX 177, SUPERIOR, IA 51363-0177
PO BOX 178, SUPERIOR, IA 51363-0178
PO BOX 179, SUPERIOR, IA 51363-0179
PO BOX 180, SUPERIOR, IA 51363-0180
PO BOX 181, SUPERIOR, IA 51363-0181
PO BOX 182, SUPERIOR, IA 51363-0182
PO BOX 183, SUPERIOR, IA 51363-0183
PO BOX 184, SUPERIOR, IA 51363-0184
PO BOX 185, SUPERIOR, IA 51363-0185
PO BOX 186, SUPERIOR, IA 51363-0186
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