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, GLIDDEN, IA 51443-0001
PO BOX 2, GLIDDEN, IA 51443-0002
PO BOX 3, GLIDDEN, IA 51443-0003
PO BOX 4, GLIDDEN, IA 51443-0004
PO BOX 5, GLIDDEN, IA 51443-0005
PO BOX 6, GLIDDEN, IA 51443-0006
PO BOX 7, GLIDDEN, IA 51443-0007
PO BOX 8, GLIDDEN, IA 51443-0008
PO BOX 9, GLIDDEN, IA 51443-0009
PO BOX 10, GLIDDEN, IA 51443-0010
PO BOX 11, GLIDDEN, IA 51443-0011
PO BOX 12, GLIDDEN, IA 51443-0012
PO BOX 13, GLIDDEN, IA 51443-0013
PO BOX 14, GLIDDEN, IA 51443-0014
PO BOX 15, GLIDDEN, IA 51443-0015
PO BOX 16, GLIDDEN, IA 51443-0016
PO BOX 17, GLIDDEN, IA 51443-0017
PO BOX 18, GLIDDEN, IA 51443-0018
PO BOX 19, GLIDDEN, IA 51443-0019
PO BOX 20, GLIDDEN, IA 51443-0020
PO BOX 21, GLIDDEN, IA 51443-0021
PO BOX 22, GLIDDEN, IA 51443-0022
PO BOX 23, GLIDDEN, IA 51443-0023
PO BOX 24, GLIDDEN, IA 51443-0024
PO BOX 25, GLIDDEN, IA 51443-0025
PO BOX 26, GLIDDEN, IA 51443-0026
PO BOX 27, GLIDDEN, IA 51443-0027
PO BOX 28, GLIDDEN, IA 51443-0028
PO BOX 29, GLIDDEN, IA 51443-0029
PO BOX 30, GLIDDEN, IA 51443-0030
PO BOX 31, GLIDDEN, IA 51443-0031
PO BOX 32, GLIDDEN, IA 51443-0032
PO BOX 33, GLIDDEN, IA 51443-0033
PO BOX 34, GLIDDEN, IA 51443-0034
PO BOX 35, GLIDDEN, IA 51443-0035
PO BOX 36, GLIDDEN, IA 51443-0036
PO BOX 37, GLIDDEN, IA 51443-0037
PO BOX 38, GLIDDEN, IA 51443-0038
PO BOX 39, GLIDDEN, IA 51443-0039
PO BOX 40, GLIDDEN, IA 51443-0040
PO BOX 41, GLIDDEN, IA 51443-0041
PO BOX 42, GLIDDEN, IA 51443-0042
PO BOX 43, GLIDDEN, IA 51443-0043
PO BOX 44, GLIDDEN, IA 51443-0044
PO BOX 45, GLIDDEN, IA 51443-0045
PO BOX 46, GLIDDEN, IA 51443-0046
PO BOX 47, GLIDDEN, IA 51443-0047
PO BOX 48, GLIDDEN, IA 51443-0048
PO BOX 49, GLIDDEN, IA 51443-0049
PO BOX 50, GLIDDEN, IA 51443-0050
PO BOX 51, GLIDDEN, IA 51443-0051
PO BOX 52, GLIDDEN, IA 51443-0052
PO BOX 53, GLIDDEN, IA 51443-0053
PO BOX 54, GLIDDEN, IA 51443-0054
PO BOX 55, GLIDDEN, IA 51443-0055
PO BOX 56, GLIDDEN, IA 51443-0056
PO BOX 57, GLIDDEN, IA 51443-0057
PO BOX 58, GLIDDEN, IA 51443-0058
PO BOX 59, GLIDDEN, IA 51443-0059
PO BOX 60, GLIDDEN, IA 51443-0060
PO BOX 61, GLIDDEN, IA 51443-0061
PO BOX 62, GLIDDEN, IA 51443-0062
PO BOX 63, GLIDDEN, IA 51443-0063
PO BOX 64, GLIDDEN, IA 51443-0064
PO BOX 65, GLIDDEN, IA 51443-0065
PO BOX 66, GLIDDEN, IA 51443-0066
PO BOX 67, GLIDDEN, IA 51443-0067
PO BOX 68, GLIDDEN, IA 51443-0068
PO BOX 69, GLIDDEN, IA 51443-0069
PO BOX 70, GLIDDEN, IA 51443-0070
PO BOX 71, GLIDDEN, IA 51443-0071
PO BOX 72, GLIDDEN, IA 51443-0072
PO BOX 73, GLIDDEN, IA 51443-0073
PO BOX 74, GLIDDEN, IA 51443-0074
PO BOX 75, GLIDDEN, IA 51443-0075
PO BOX 76, GLIDDEN, IA 51443-0076
PO BOX 77, GLIDDEN, IA 51443-0077
PO BOX 78, GLIDDEN, IA 51443-0078
PO BOX 79, GLIDDEN, IA 51443-0079
PO BOX 80, GLIDDEN, IA 51443-0080
PO BOX 81, GLIDDEN, IA 51443-0081
PO BOX 82, GLIDDEN, IA 51443-0082
PO BOX 83, GLIDDEN, IA 51443-0083
PO BOX 84, GLIDDEN, IA 51443-0084
PO BOX 85, GLIDDEN, IA 51443-0085
PO BOX 86, GLIDDEN, IA 51443-0086
PO BOX 87, GLIDDEN, IA 51443-0087
PO BOX 88, GLIDDEN, IA 51443-0088
PO BOX 89, GLIDDEN, IA 51443-0089
PO BOX 90, GLIDDEN, IA 51443-0090
PO BOX 91, GLIDDEN, IA 51443-0091
PO BOX 92, GLIDDEN, IA 51443-0092
PO BOX 93, GLIDDEN, IA 51443-0093
PO BOX 94, GLIDDEN, IA 51443-0094
PO BOX 95, GLIDDEN, IA 51443-0095
PO BOX 96, GLIDDEN, IA 51443-0096
PO BOX 97, GLIDDEN, IA 51443-0097
PO BOX 98, GLIDDEN, IA 51443-0098
PO BOX 99, GLIDDEN, IA 51443-0099
PO BOX 100, GLIDDEN, IA 51443-0100
PO BOX 101, GLIDDEN, IA 51443-0101
PO BOX 102, GLIDDEN, IA 51443-0102
PO BOX 103, GLIDDEN, IA 51443-0103
PO BOX 104, GLIDDEN, IA 51443-0104
PO BOX 105, GLIDDEN, IA 51443-0105
PO BOX 106, GLIDDEN, IA 51443-0106
PO BOX 107, GLIDDEN, IA 51443-0107
PO BOX 108, GLIDDEN, IA 51443-0108
PO BOX 109, GLIDDEN, IA 51443-0109
PO BOX 110, GLIDDEN, IA 51443-0110
PO BOX 111, GLIDDEN, IA 51443-0111
PO BOX 112, GLIDDEN, IA 51443-0112
PO BOX 113, GLIDDEN, IA 51443-0113
PO BOX 114, GLIDDEN, IA 51443-0114
PO BOX 115, GLIDDEN, IA 51443-0115
PO BOX 116, GLIDDEN, IA 51443-0116
PO BOX 117, GLIDDEN, IA 51443-0117
PO BOX 118, GLIDDEN, IA 51443-0118
PO BOX 119, GLIDDEN, IA 51443-0119
PO BOX 120, GLIDDEN, IA 51443-0120
PO BOX 121, GLIDDEN, IA 51443-0121
PO BOX 122, GLIDDEN, IA 51443-0122
PO BOX 123, GLIDDEN, IA 51443-0123
PO BOX 124, GLIDDEN, IA 51443-0124
PO BOX 125, GLIDDEN, IA 51443-0125
PO BOX 126, GLIDDEN, IA 51443-0126
PO BOX 127, GLIDDEN, IA 51443-0127
PO BOX 128, GLIDDEN, IA 51443-0128
PO BOX 129, GLIDDEN, IA 51443-0129
PO BOX 130, GLIDDEN, IA 51443-0130
PO BOX 131, GLIDDEN, IA 51443-0131
PO BOX 132, GLIDDEN, IA 51443-0132
PO BOX 133, GLIDDEN, IA 51443-0133
PO BOX 134, GLIDDEN, IA 51443-0134
PO BOX 135, GLIDDEN, IA 51443-0135
PO BOX 136, GLIDDEN, IA 51443-0136
PO BOX 137, GLIDDEN, IA 51443-0137
PO BOX 138, GLIDDEN, IA 51443-0138
PO BOX 139, GLIDDEN, IA 51443-0139
PO BOX 140, GLIDDEN, IA 51443-0140
PO BOX 141, GLIDDEN, IA 51443-0141
PO BOX 142, GLIDDEN, IA 51443-0142
PO BOX 143, GLIDDEN, IA 51443-0143
PO BOX 144, GLIDDEN, IA 51443-0144
PO BOX 145, GLIDDEN, IA 51443-0145
PO BOX 146, GLIDDEN, IA 51443-0146
PO BOX 147, GLIDDEN, IA 51443-0147
PO BOX 148, GLIDDEN, IA 51443-0148
PO BOX 149, GLIDDEN, IA 51443-0149
PO BOX 150, GLIDDEN, IA 51443-0150
PO BOX 151, GLIDDEN, IA 51443-0151
PO BOX 152, GLIDDEN, IA 51443-0152
PO BOX 153, GLIDDEN, IA 51443-0153
PO BOX 154, GLIDDEN, IA 51443-0154
PO BOX 155, GLIDDEN, IA 51443-0155
PO BOX 156, GLIDDEN, IA 51443-0156
PO BOX 157, GLIDDEN, IA 51443-0157
PO BOX 158, GLIDDEN, IA 51443-0158
PO BOX 159, GLIDDEN, IA 51443-0159
PO BOX 160, GLIDDEN, IA 51443-0160
PO BOX 161, GLIDDEN, IA 51443-0161
PO BOX 162, GLIDDEN, IA 51443-0162
PO BOX 163, GLIDDEN, IA 51443-0163
PO BOX 164, GLIDDEN, IA 51443-0164
PO BOX 165, GLIDDEN, IA 51443-0165
PO BOX 166, GLIDDEN, IA 51443-0166
PO BOX 167, GLIDDEN, IA 51443-0167
PO BOX 168, GLIDDEN, IA 51443-0168
PO BOX 169, GLIDDEN, IA 51443-0169
PO BOX 170, GLIDDEN, IA 51443-0170
PO BOX 171, GLIDDEN, IA 51443-0171
PO BOX 172, GLIDDEN, IA 51443-0172
PO BOX 173, GLIDDEN, IA 51443-0173
PO BOX 174, GLIDDEN, IA 51443-0174
PO BOX 175, GLIDDEN, IA 51443-0175
PO BOX 176, GLIDDEN, IA 51443-0176
PO BOX 177, GLIDDEN, IA 51443-0177
PO BOX 178, GLIDDEN, IA 51443-0178
PO BOX 179, GLIDDEN, IA 51443-0179
PO BOX 180, GLIDDEN, IA 51443-0180
PO BOX 181, GLIDDEN, IA 51443-0181
PO BOX 182, GLIDDEN, IA 51443-0182
PO BOX 183, GLIDDEN, IA 51443-0183
PO BOX 184, GLIDDEN, IA 51443-0184
PO BOX 185, GLIDDEN, IA 51443-0185
PO BOX 186, GLIDDEN, IA 51443-0186
PO BOX 187, GLIDDEN, IA 51443-0187
PO BOX 188, GLIDDEN, IA 51443-0188
PO BOX 189, GLIDDEN, IA 51443-0189
PO BOX 190, GLIDDEN, IA 51443-0190
PO BOX 191, GLIDDEN, IA 51443-0191
PO BOX 192, GLIDDEN, IA 51443-0192
PO BOX 193, GLIDDEN, IA 51443-0193
PO BOX 194, GLIDDEN, IA 51443-0194
PO BOX 195, GLIDDEN, IA 51443-0195
PO BOX 196, GLIDDEN, IA 51443-0196
PO BOX 197, GLIDDEN, IA 51443-0197
PO BOX 198, GLIDDEN, IA 51443-0198
PO BOX 199, GLIDDEN, IA 51443-0199
PO BOX 200, GLIDDEN, IA 51443-0200
PO BOX 201, GLIDDEN, IA 51443-0201
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