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, CORYDON, IA 50060-0001
PO BOX 2, CORYDON, IA 50060-0002
PO BOX 3, CORYDON, IA 50060-0003
PO BOX 4, CORYDON, IA 50060-0004
PO BOX 5, CORYDON, IA 50060-0005
PO BOX 6, CORYDON, IA 50060-0006
PO BOX 7, CORYDON, IA 50060-0007
PO BOX 8, CORYDON, IA 50060-0008
PO BOX 9, CORYDON, IA 50060-0009
PO BOX 10, CORYDON, IA 50060-0010
PO BOX 11, CORYDON, IA 50060-0011
PO BOX 12, CORYDON, IA 50060-0012
PO BOX 13, CORYDON, IA 50060-0013
PO BOX 14, CORYDON, IA 50060-0014
PO BOX 15, CORYDON, IA 50060-0015
PO BOX 16, CORYDON, IA 50060-0016
PO BOX 17, CORYDON, IA 50060-0017
PO BOX 18, CORYDON, IA 50060-0018
PO BOX 19, CORYDON, IA 50060-0019
PO BOX 20, CORYDON, IA 50060-0020
PO BOX 21, CORYDON, IA 50060-0021
PO BOX 22, CORYDON, IA 50060-0022
PO BOX 23, CORYDON, IA 50060-0023
PO BOX 24, CORYDON, IA 50060-0024
PO BOX 25, CORYDON, IA 50060-0025
PO BOX 26, CORYDON, IA 50060-0026
PO BOX 27, CORYDON, IA 50060-0027
PO BOX 28, CORYDON, IA 50060-0028
PO BOX 29, CORYDON, IA 50060-0029
PO BOX 30, CORYDON, IA 50060-0030
PO BOX 31, CORYDON, IA 50060-0031
PO BOX 32, CORYDON, IA 50060-0032
PO BOX 33, CORYDON, IA 50060-0033
PO BOX 34, CORYDON, IA 50060-0034
PO BOX 35, CORYDON, IA 50060-0035
PO BOX 36, CORYDON, IA 50060-0036
PO BOX 37, CORYDON, IA 50060-0037
PO BOX 38, CORYDON, IA 50060-0038
PO BOX 39, CORYDON, IA 50060-0039
PO BOX 40, CORYDON, IA 50060-0040
PO BOX 41, CORYDON, IA 50060-0041
PO BOX 42, CORYDON, IA 50060-0042
PO BOX 43, CORYDON, IA 50060-0043
PO BOX 44, CORYDON, IA 50060-0044
PO BOX 45, CORYDON, IA 50060-0045
PO BOX 46, CORYDON, IA 50060-0046
PO BOX 47, CORYDON, IA 50060-0047
PO BOX 48, CORYDON, IA 50060-0048
PO BOX 49, CORYDON, IA 50060-0049
PO BOX 50, CORYDON, IA 50060-0050
PO BOX 51, CORYDON, IA 50060-0051
PO BOX 52, CORYDON, IA 50060-0052
PO BOX 53, CORYDON, IA 50060-0053
PO BOX 54, CORYDON, IA 50060-0054
PO BOX 55, CORYDON, IA 50060-0055
PO BOX 56, CORYDON, IA 50060-0056
PO BOX 57, CORYDON, IA 50060-0057
PO BOX 58, CORYDON, IA 50060-0058
PO BOX 59, CORYDON, IA 50060-0059
PO BOX 60, CORYDON, IA 50060-0060
PO BOX 61, CORYDON, IA 50060-0061
PO BOX 62, CORYDON, IA 50060-0062
PO BOX 63, CORYDON, IA 50060-0063
PO BOX 64, CORYDON, IA 50060-0064
PO BOX 65, CORYDON, IA 50060-0065
PO BOX 66, CORYDON, IA 50060-0066
PO BOX 67, CORYDON, IA 50060-0067
PO BOX 68, CORYDON, IA 50060-0068
PO BOX 69, CORYDON, IA 50060-0069
PO BOX 70, CORYDON, IA 50060-0070
PO BOX 71, CORYDON, IA 50060-0071
PO BOX 72, CORYDON, IA 50060-0072
PO BOX 73, CORYDON, IA 50060-0073
PO BOX 74, CORYDON, IA 50060-0074
PO BOX 75, CORYDON, IA 50060-0075
PO BOX 76, CORYDON, IA 50060-0076
PO BOX 77, CORYDON, IA 50060-0077
PO BOX 78, CORYDON, IA 50060-0078
PO BOX 79, CORYDON, IA 50060-0079
PO BOX 80, CORYDON, IA 50060-0080
PO BOX 81, CORYDON, IA 50060-0081
PO BOX 82, CORYDON, IA 50060-0082
PO BOX 83, CORYDON, IA 50060-0083
PO BOX 84, CORYDON, IA 50060-0084
PO BOX 85, CORYDON, IA 50060-0085
PO BOX 86, CORYDON, IA 50060-0086
PO BOX 87, CORYDON, IA 50060-0087
PO BOX 88, CORYDON, IA 50060-0088
PO BOX 89, CORYDON, IA 50060-0089
PO BOX 90, CORYDON, IA 50060-0090
PO BOX 91, CORYDON, IA 50060-0091
PO BOX 92, CORYDON, IA 50060-0092
PO BOX 93, CORYDON, IA 50060-0093
PO BOX 94, CORYDON, IA 50060-0094
PO BOX 95, CORYDON, IA 50060-0095
PO BOX 96, CORYDON, IA 50060-0096
PO BOX 97, CORYDON, IA 50060-0097
PO BOX 98, CORYDON, IA 50060-0098
PO BOX 99, CORYDON, IA 50060-0099
PO BOX 100, CORYDON, IA 50060-0100
PO BOX 101, CORYDON, IA 50060-0101
PO BOX 102, CORYDON, IA 50060-0102
PO BOX 103, CORYDON, IA 50060-0103
PO BOX 104, CORYDON, IA 50060-0104
PO BOX 105, CORYDON, IA 50060-0105
PO BOX 106, CORYDON, IA 50060-0106
PO BOX 107, CORYDON, IA 50060-0107
PO BOX 108, CORYDON, IA 50060-0108
PO BOX 109, CORYDON, IA 50060-0109
PO BOX 110, CORYDON, IA 50060-0110
PO BOX 111, CORYDON, IA 50060-0111
PO BOX 112, CORYDON, IA 50060-0112
PO BOX 113, CORYDON, IA 50060-0113
PO BOX 114, CORYDON, IA 50060-0114
PO BOX 115, CORYDON, IA 50060-0115
PO BOX 116, CORYDON, IA 50060-0116
PO BOX 117, CORYDON, IA 50060-0117
PO BOX 118, CORYDON, IA 50060-0118
PO BOX 119, CORYDON, IA 50060-0119
PO BOX 120, CORYDON, IA 50060-0120
PO BOX 121, CORYDON, IA 50060-0121
PO BOX 122, CORYDON, IA 50060-0122
PO BOX 123, CORYDON, IA 50060-0123
PO BOX 124, CORYDON, IA 50060-0124
PO BOX 125, CORYDON, IA 50060-0125
PO BOX 126, CORYDON, IA 50060-0126
PO BOX 127, CORYDON, IA 50060-0127
PO BOX 128, CORYDON, IA 50060-0128
PO BOX 129, CORYDON, IA 50060-0129
PO BOX 130, CORYDON, IA 50060-0130
PO BOX 131, CORYDON, IA 50060-0131
PO BOX 132, CORYDON, IA 50060-0132
PO BOX 133, CORYDON, IA 50060-0133
PO BOX 134, CORYDON, IA 50060-0134
PO BOX 135, CORYDON, IA 50060-0135
PO BOX 136, CORYDON, IA 50060-0136
PO BOX 137, CORYDON, IA 50060-0137
PO BOX 138, CORYDON, IA 50060-0138
PO BOX 139, CORYDON, IA 50060-0139
PO BOX 140, CORYDON, IA 50060-0140
PO BOX 141, CORYDON, IA 50060-0141
PO BOX 142, CORYDON, IA 50060-0142
PO BOX 143, CORYDON, IA 50060-0143
PO BOX 144, CORYDON, IA 50060-0144
PO BOX 145, CORYDON, IA 50060-0145
PO BOX 146, CORYDON, IA 50060-0146
PO BOX 147, CORYDON, IA 50060-0147
PO BOX 148, CORYDON, IA 50060-0148
PO BOX 149, CORYDON, IA 50060-0149
PO BOX 150, CORYDON, IA 50060-0150
PO BOX 151, CORYDON, IA 50060-0151
PO BOX 152, CORYDON, IA 50060-0152
PO BOX 153, CORYDON, IA 50060-0153
PO BOX 154, CORYDON, IA 50060-0154
PO BOX 155, CORYDON, IA 50060-0155
PO BOX 156, CORYDON, IA 50060-0156
PO BOX 157, CORYDON, IA 50060-0157
PO BOX 158, CORYDON, IA 50060-0158
PO BOX 159, CORYDON, IA 50060-0159
PO BOX 160, CORYDON, IA 50060-0160
PO BOX 161, CORYDON, IA 50060-0161
PO BOX 162, CORYDON, IA 50060-0162
PO BOX 163, CORYDON, IA 50060-0163
PO BOX 164, CORYDON, IA 50060-0164
PO BOX 165, CORYDON, IA 50060-0165
PO BOX 166, CORYDON, IA 50060-0166
PO BOX 167, CORYDON, IA 50060-0167
PO BOX 168, CORYDON, IA 50060-0168
PO BOX 169, CORYDON, IA 50060-0169
PO BOX 170, CORYDON, IA 50060-0170
PO BOX 171, CORYDON, IA 50060-0171
PO BOX 172, CORYDON, IA 50060-0172
PO BOX 173, CORYDON, IA 50060-0173
PO BOX 174, CORYDON, IA 50060-0174
PO BOX 175, CORYDON, IA 50060-0175
PO BOX 176, CORYDON, IA 50060-0176
PO BOX 177, CORYDON, IA 50060-0177
PO BOX 178, CORYDON, IA 50060-0178
PO BOX 179, CORYDON, IA 50060-0179
PO BOX 180, CORYDON, IA 50060-0180
PO BOX 181, CORYDON, IA 50060-0181
PO BOX 182, CORYDON, IA 50060-0182
PO BOX 183, CORYDON, IA 50060-0183
PO BOX 184, CORYDON, IA 50060-0184
PO BOX 185, CORYDON, IA 50060-0185
PO BOX 186, CORYDON, IA 50060-0186
PO BOX 187, CORYDON, IA 50060-0187
PO BOX 188, CORYDON, IA 50060-0188
PO BOX 189, CORYDON, IA 50060-0189
PO BOX 190, CORYDON, IA 50060-0190
PO BOX 191, CORYDON, IA 50060-0191
PO BOX 192, CORYDON, IA 50060-0192
PO BOX 193, CORYDON, IA 50060-0193
PO BOX 194, CORYDON, IA 50060-0194
PO BOX 195, CORYDON, IA 50060-0195
PO BOX 196, CORYDON, IA 50060-0196
PO BOX 197, CORYDON, IA 50060-0197
PO BOX 198, CORYDON, IA 50060-0198
PO BOX 199, CORYDON, IA 50060-0199
PO BOX 200, CORYDON, IA 50060-0200
PO BOX 201, CORYDON, IA 50060-0201
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