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, CRESCO, IA 52136-0011
PO BOX 12, CRESCO, IA 52136-0012
PO BOX 13, CRESCO, IA 52136-0013
PO BOX 14, CRESCO, IA 52136-0014
PO BOX 15, CRESCO, IA 52136-0015
PO BOX 16, CRESCO, IA 52136-0016
PO BOX 17, CRESCO, IA 52136-0017
PO BOX 18, CRESCO, IA 52136-0018
PO BOX 19, CRESCO, IA 52136-0019
PO BOX 20, CRESCO, IA 52136-0020
PO BOX 21, CRESCO, IA 52136-0021
PO BOX 22, CRESCO, IA 52136-0022
PO BOX 23, CRESCO, IA 52136-0023
PO BOX 24, CRESCO, IA 52136-0024
PO BOX 25, CRESCO, IA 52136-0025
PO BOX 26, CRESCO, IA 52136-0026
PO BOX 27, CRESCO, IA 52136-0027
PO BOX 28, CRESCO, IA 52136-0028
PO BOX 29, CRESCO, IA 52136-0029
PO BOX 30, CRESCO, IA 52136-0030
PO BOX 31, CRESCO, IA 52136-0031
PO BOX 32, CRESCO, IA 52136-0032
PO BOX 33, CRESCO, IA 52136-0033
PO BOX 34, CRESCO, IA 52136-0034
PO BOX 35, CRESCO, IA 52136-0035
PO BOX 36, CRESCO, IA 52136-0036
PO BOX 37, CRESCO, IA 52136-0037
PO BOX 38, CRESCO, IA 52136-0038
PO BOX 39, CRESCO, IA 52136-0039
PO BOX 40, CRESCO, IA 52136-0040
PO BOX 41, CRESCO, IA 52136-0041
PO BOX 42, CRESCO, IA 52136-0042
PO BOX 43, CRESCO, IA 52136-0043
PO BOX 44, CRESCO, IA 52136-0044
PO BOX 45, CRESCO, IA 52136-0045
PO BOX 46, CRESCO, IA 52136-0046
PO BOX 47, CRESCO, IA 52136-0047
PO BOX 48, CRESCO, IA 52136-0048
PO BOX 49, CRESCO, IA 52136-0049
PO BOX 50, CRESCO, IA 52136-0050
PO BOX 51, CRESCO, IA 52136-0051
PO BOX 52, CRESCO, IA 52136-0052
PO BOX 53, CRESCO, IA 52136-0053
PO BOX 54, CRESCO, IA 52136-0054
PO BOX 55, CRESCO, IA 52136-0055
PO BOX 56, CRESCO, IA 52136-0056
PO BOX 57, CRESCO, IA 52136-0057
PO BOX 58, CRESCO, IA 52136-0058
PO BOX 59, CRESCO, IA 52136-0059
PO BOX 60, CRESCO, IA 52136-0060
PO BOX 61, CRESCO, IA 52136-0061
PO BOX 62, CRESCO, IA 52136-0062
PO BOX 63, CRESCO, IA 52136-0063
PO BOX 64, CRESCO, IA 52136-0064
PO BOX 65, CRESCO, IA 52136-0065
PO BOX 66, CRESCO, IA 52136-0066
PO BOX 67, CRESCO, IA 52136-0067
PO BOX 68, CRESCO, IA 52136-0068
PO BOX 69, CRESCO, IA 52136-0069
PO BOX 70, CRESCO, IA 52136-0070
PO BOX 71, CRESCO, IA 52136-0071
PO BOX 72, CRESCO, IA 52136-0072
PO BOX 73, CRESCO, IA 52136-0073
PO BOX 74, CRESCO, IA 52136-0074
PO BOX 75, CRESCO, IA 52136-0075
PO BOX 76, CRESCO, IA 52136-0076
PO BOX 77, CRESCO, IA 52136-0077
PO BOX 78, CRESCO, IA 52136-0078
PO BOX 79, CRESCO, IA 52136-0079
PO BOX 80, CRESCO, IA 52136-0080
PO BOX 81, CRESCO, IA 52136-0081
PO BOX 82, CRESCO, IA 52136-0082
PO BOX 83, CRESCO, IA 52136-0083
PO BOX 84, CRESCO, IA 52136-0084
PO BOX 85, CRESCO, IA 52136-0085
PO BOX 86, CRESCO, IA 52136-0086
PO BOX 87, CRESCO, IA 52136-0087
PO BOX 88, CRESCO, IA 52136-0088
PO BOX 89, CRESCO, IA 52136-0089
PO BOX 90, CRESCO, IA 52136-0090
PO BOX 91, CRESCO, IA 52136-0091
PO BOX 92, CRESCO, IA 52136-0092
PO BOX 93, CRESCO, IA 52136-0093
PO BOX 94, CRESCO, IA 52136-0094
PO BOX 95, CRESCO, IA 52136-0095
PO BOX 96, CRESCO, IA 52136-0096
PO BOX 97, CRESCO, IA 52136-0097
PO BOX 98, CRESCO, IA 52136-0098
PO BOX 99, CRESCO, IA 52136-0099
PO BOX 100, CRESCO, IA 52136-0100
PO BOX 101, CRESCO, IA 52136-0101
PO BOX 102, CRESCO, IA 52136-0102
PO BOX 103, CRESCO, IA 52136-0103
PO BOX 104, CRESCO, IA 52136-0104
PO BOX 105, CRESCO, IA 52136-0105
PO BOX 106, CRESCO, IA 52136-0106
PO BOX 107, CRESCO, IA 52136-0107
PO BOX 108, CRESCO, IA 52136-0108
PO BOX 109, CRESCO, IA 52136-0109
PO BOX 110, CRESCO, IA 52136-0110
PO BOX 111, CRESCO, IA 52136-0111
PO BOX 112, CRESCO, IA 52136-0112
PO BOX 113, CRESCO, IA 52136-0113
PO BOX 114, CRESCO, IA 52136-0114
PO BOX 115, CRESCO, IA 52136-0115
PO BOX 116, CRESCO, IA 52136-0116
PO BOX 117, CRESCO, IA 52136-0117
PO BOX 118, CRESCO, IA 52136-0118
PO BOX 119, CRESCO, IA 52136-0119
PO BOX 120, CRESCO, IA 52136-0120
PO BOX 121, CRESCO, IA 52136-0121
PO BOX 122, CRESCO, IA 52136-0122
PO BOX 123, CRESCO, IA 52136-0123
PO BOX 124, CRESCO, IA 52136-0124
PO BOX 125, CRESCO, IA 52136-0125
PO BOX 126, CRESCO, IA 52136-0126
PO BOX 127, CRESCO, IA 52136-0127
PO BOX 128, CRESCO, IA 52136-0128
PO BOX 129, CRESCO, IA 52136-0129
PO BOX 130, CRESCO, IA 52136-0130
PO BOX 131, CRESCO, IA 52136-0131
PO BOX 132, CRESCO, IA 52136-0132
PO BOX 133, CRESCO, IA 52136-0133
PO BOX 134, CRESCO, IA 52136-0134
PO BOX 135, CRESCO, IA 52136-0135
PO BOX 136, CRESCO, IA 52136-0136
PO BOX 137, CRESCO, IA 52136-0137
PO BOX 138, CRESCO, IA 52136-0138
PO BOX 139, CRESCO, IA 52136-0139
PO BOX 140, CRESCO, IA 52136-0140
PO BOX 141, CRESCO, IA 52136-0141
PO BOX 142, CRESCO, IA 52136-0142
PO BOX 143, CRESCO, IA 52136-0143
PO BOX 144, CRESCO, IA 52136-0144
PO BOX 145, CRESCO, IA 52136-0145
PO BOX 146, CRESCO, IA 52136-0146
PO BOX 147, CRESCO, IA 52136-0147
PO BOX 148, CRESCO, IA 52136-0148
PO BOX 149, CRESCO, IA 52136-0149
PO BOX 150, CRESCO, IA 52136-0150
PO BOX 151, CRESCO, IA 52136-0151
PO BOX 152, CRESCO, IA 52136-0152
PO BOX 153, CRESCO, IA 52136-0153
PO BOX 154, CRESCO, IA 52136-0154
PO BOX 155, CRESCO, IA 52136-0155
PO BOX 156, CRESCO, IA 52136-0156
PO BOX 157, CRESCO, IA 52136-0157
PO BOX 158, CRESCO, IA 52136-0158
PO BOX 159, CRESCO, IA 52136-0159
PO BOX 160, CRESCO, IA 52136-0160
PO BOX 161, CRESCO, IA 52136-0161
PO BOX 162, CRESCO, IA 52136-0162
PO BOX 163, CRESCO, IA 52136-0163
PO BOX 164, CRESCO, IA 52136-0164
PO BOX 165, CRESCO, IA 52136-0165
PO BOX 166, CRESCO, IA 52136-0166
PO BOX 167, CRESCO, IA 52136-0167
PO BOX 168, CRESCO, IA 52136-0168
PO BOX 169, CRESCO, IA 52136-0169
PO BOX 170, CRESCO, IA 52136-0170
PO BOX 171, CRESCO, IA 52136-0171
PO BOX 172, CRESCO, IA 52136-0172
PO BOX 173, CRESCO, IA 52136-0173
PO BOX 174, CRESCO, IA 52136-0174
PO BOX 175, CRESCO, IA 52136-0175
PO BOX 176, CRESCO, IA 52136-0176
PO BOX 177, CRESCO, IA 52136-0177
PO BOX 178, CRESCO, IA 52136-0178
PO BOX 179, CRESCO, IA 52136-0179
PO BOX 180, CRESCO, IA 52136-0180
PO BOX 181, CRESCO, IA 52136-0181
PO BOX 182, CRESCO, IA 52136-0182
PO BOX 183, CRESCO, IA 52136-0183
PO BOX 184, CRESCO, IA 52136-0184
PO BOX 185, CRESCO, IA 52136-0185
PO BOX 186, CRESCO, IA 52136-0186
PO BOX 187, CRESCO, IA 52136-0187
PO BOX 188, CRESCO, IA 52136-0188
PO BOX 189, CRESCO, IA 52136-0189
PO BOX 190, CRESCO, IA 52136-0190
PO BOX 191, CRESCO, IA 52136-0191
PO BOX 192, CRESCO, IA 52136-0192
PO BOX 193, CRESCO, IA 52136-0193
PO BOX 194, CRESCO, IA 52136-0194
PO BOX 195, CRESCO, IA 52136-0195
PO BOX 196, CRESCO, IA 52136-0196
PO BOX 197, CRESCO, IA 52136-0197
PO BOX 198, CRESCO, IA 52136-0198
PO BOX 199, CRESCO, IA 52136-0199
PO BOX 200, CRESCO, IA 52136-0200
PO BOX 201, CRESCO, IA 52136-0201
PO BOX 202, CRESCO, IA 52136-0202
PO BOX 203, CRESCO, IA 52136-0203
PO BOX 204, CRESCO, IA 52136-0204
PO BOX 205, CRESCO, IA 52136-0205
PO BOX 206, CRESCO, IA 52136-0206
PO BOX 207, CRESCO, IA 52136-0207
PO BOX 208, CRESCO, IA 52136-0208
PO BOX 209, CRESCO, IA 52136-0209
PO BOX 210, CRESCO, IA 52136-0210
PO BOX 211, CRESCO, IA 52136-0211
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