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, CHARLES CITY, IA 50616-0001
PO BOX 2, CHARLES CITY, IA 50616-0002
PO BOX 3, CHARLES CITY, IA 50616-0003
PO BOX 4, CHARLES CITY, IA 50616-0004
PO BOX 5, CHARLES CITY, IA 50616-0005
PO BOX 6, CHARLES CITY, IA 50616-0006
PO BOX 7, CHARLES CITY, IA 50616-0007
PO BOX 8, CHARLES CITY, IA 50616-0008
PO BOX 9, CHARLES CITY, IA 50616-0009
PO BOX 10, CHARLES CITY, IA 50616-0010
PO BOX 11, CHARLES CITY, IA 50616-0011
PO BOX 12, CHARLES CITY, IA 50616-0012
PO BOX 13, CHARLES CITY, IA 50616-0013
PO BOX 14, CHARLES CITY, IA 50616-0014
PO BOX 15, CHARLES CITY, IA 50616-0015
PO BOX 16, CHARLES CITY, IA 50616-0016
PO BOX 17, CHARLES CITY, IA 50616-0017
PO BOX 18, CHARLES CITY, IA 50616-0018
PO BOX 19, CHARLES CITY, IA 50616-0019
PO BOX 20, CHARLES CITY, IA 50616-0020
PO BOX 21, CHARLES CITY, IA 50616-0021
PO BOX 22, CHARLES CITY, IA 50616-0022
PO BOX 23, CHARLES CITY, IA 50616-0023
PO BOX 24, CHARLES CITY, IA 50616-0024
PO BOX 25, CHARLES CITY, IA 50616-0025
PO BOX 26, CHARLES CITY, IA 50616-0026
PO BOX 27, CHARLES CITY, IA 50616-0027
PO BOX 28, CHARLES CITY, IA 50616-0028
PO BOX 29, CHARLES CITY, IA 50616-0029
PO BOX 30, CHARLES CITY, IA 50616-0030
PO BOX 31, CHARLES CITY, IA 50616-0031
PO BOX 32, CHARLES CITY, IA 50616-0032
PO BOX 33, CHARLES CITY, IA 50616-0033
PO BOX 34, CHARLES CITY, IA 50616-0034
PO BOX 35, CHARLES CITY, IA 50616-0035
PO BOX 36, CHARLES CITY, IA 50616-0036
PO BOX 37, CHARLES CITY, IA 50616-0037
PO BOX 38, CHARLES CITY, IA 50616-0038
PO BOX 39, CHARLES CITY, IA 50616-0039
PO BOX 40, CHARLES CITY, IA 50616-0040
PO BOX 41, CHARLES CITY, IA 50616-0041
PO BOX 42, CHARLES CITY, IA 50616-0042
PO BOX 43, CHARLES CITY, IA 50616-0043
PO BOX 44, CHARLES CITY, IA 50616-0044
PO BOX 45, CHARLES CITY, IA 50616-0045
PO BOX 46, CHARLES CITY, IA 50616-0046
PO BOX 47, CHARLES CITY, IA 50616-0047
PO BOX 48, CHARLES CITY, IA 50616-0048
PO BOX 49, CHARLES CITY, IA 50616-0049
PO BOX 50, CHARLES CITY, IA 50616-0050
PO BOX 51, CHARLES CITY, IA 50616-0051
PO BOX 52, CHARLES CITY, IA 50616-0052
PO BOX 53, CHARLES CITY, IA 50616-0053
PO BOX 54, CHARLES CITY, IA 50616-0054
PO BOX 55, CHARLES CITY, IA 50616-0055
PO BOX 56, CHARLES CITY, IA 50616-0056
PO BOX 57, CHARLES CITY, IA 50616-0057
PO BOX 58, CHARLES CITY, IA 50616-0058
PO BOX 59, CHARLES CITY, IA 50616-0059
PO BOX 60, CHARLES CITY, IA 50616-0060
PO BOX 61, CHARLES CITY, IA 50616-0061
PO BOX 62, CHARLES CITY, IA 50616-0062
PO BOX 63, CHARLES CITY, IA 50616-0063
PO BOX 64, CHARLES CITY, IA 50616-0064
PO BOX 65, CHARLES CITY, IA 50616-0065
PO BOX 66, CHARLES CITY, IA 50616-0066
PO BOX 67, CHARLES CITY, IA 50616-0067
PO BOX 68, CHARLES CITY, IA 50616-0068
PO BOX 69, CHARLES CITY, IA 50616-0069
PO BOX 70, CHARLES CITY, IA 50616-0070
PO BOX 71, CHARLES CITY, IA 50616-0071
PO BOX 72, CHARLES CITY, IA 50616-0072
PO BOX 73, CHARLES CITY, IA 50616-0073
PO BOX 74, CHARLES CITY, IA 50616-0074
PO BOX 75, CHARLES CITY, IA 50616-0075
PO BOX 76, CHARLES CITY, IA 50616-0076
PO BOX 77, CHARLES CITY, IA 50616-0077
PO BOX 78, CHARLES CITY, IA 50616-0078
PO BOX 79, CHARLES CITY, IA 50616-0079
PO BOX 80, CHARLES CITY, IA 50616-0080
PO BOX 81, CHARLES CITY, IA 50616-0081
PO BOX 82, CHARLES CITY, IA 50616-0082
PO BOX 83, CHARLES CITY, IA 50616-0083
PO BOX 84, CHARLES CITY, IA 50616-0084
PO BOX 85, CHARLES CITY, IA 50616-0085
PO BOX 86, CHARLES CITY, IA 50616-0086
PO BOX 87, CHARLES CITY, IA 50616-0087
PO BOX 88, CHARLES CITY, IA 50616-0088
PO BOX 89, CHARLES CITY, IA 50616-0089
PO BOX 90, CHARLES CITY, IA 50616-0090
PO BOX 91, CHARLES CITY, IA 50616-0091
PO BOX 92, CHARLES CITY, IA 50616-0092
PO BOX 93, CHARLES CITY, IA 50616-0093
PO BOX 94, CHARLES CITY, IA 50616-0094
PO BOX 95, CHARLES CITY, IA 50616-0095
PO BOX 96, CHARLES CITY, IA 50616-0096
PO BOX 97, CHARLES CITY, IA 50616-0097
PO BOX 98, CHARLES CITY, IA 50616-0098
PO BOX 99, CHARLES CITY, IA 50616-0099
PO BOX 100, CHARLES CITY, IA 50616-0100
PO BOX 101, CHARLES CITY, IA 50616-0101
PO BOX 102, CHARLES CITY, IA 50616-0102
PO BOX 103, CHARLES CITY, IA 50616-0103
PO BOX 104, CHARLES CITY, IA 50616-0104
PO BOX 105, CHARLES CITY, IA 50616-0105
PO BOX 106, CHARLES CITY, IA 50616-0106
PO BOX 107, CHARLES CITY, IA 50616-0107
PO BOX 108, CHARLES CITY, IA 50616-0108
PO BOX 109, CHARLES CITY, IA 50616-0109
PO BOX 110, CHARLES CITY, IA 50616-0110
PO BOX 111, CHARLES CITY, IA 50616-0111
PO BOX 112, CHARLES CITY, IA 50616-0112
PO BOX 113, CHARLES CITY, IA 50616-0113
PO BOX 114, CHARLES CITY, IA 50616-0114
PO BOX 115, CHARLES CITY, IA 50616-0115
PO BOX 116, CHARLES CITY, IA 50616-0116
PO BOX 117, CHARLES CITY, IA 50616-0117
PO BOX 118, CHARLES CITY, IA 50616-0118
PO BOX 119, CHARLES CITY, IA 50616-0119
PO BOX 120, CHARLES CITY, IA 50616-0120
PO BOX 121, CHARLES CITY, IA 50616-0121
PO BOX 122, CHARLES CITY, IA 50616-0122
PO BOX 123, CHARLES CITY, IA 50616-0123
PO BOX 124, CHARLES CITY, IA 50616-0124
PO BOX 125, CHARLES CITY, IA 50616-0125
PO BOX 126, CHARLES CITY, IA 50616-0126
PO BOX 127, CHARLES CITY, IA 50616-0127
PO BOX 128, CHARLES CITY, IA 50616-0128
PO BOX 129, CHARLES CITY, IA 50616-0129
PO BOX 130, CHARLES CITY, IA 50616-0130
PO BOX 131, CHARLES CITY, IA 50616-0131
PO BOX 132, CHARLES CITY, IA 50616-0132
PO BOX 133, CHARLES CITY, IA 50616-0133
PO BOX 134, CHARLES CITY, IA 50616-0134
PO BOX 135, CHARLES CITY, IA 50616-0135
PO BOX 136, CHARLES CITY, IA 50616-0136
PO BOX 137, CHARLES CITY, IA 50616-0137
PO BOX 138, CHARLES CITY, IA 50616-0138
PO BOX 139, CHARLES CITY, IA 50616-0139
PO BOX 140, CHARLES CITY, IA 50616-0140
PO BOX 141, CHARLES CITY, IA 50616-0141
PO BOX 142, CHARLES CITY, IA 50616-0142
PO BOX 143, CHARLES CITY, IA 50616-0143
PO BOX 144, CHARLES CITY, IA 50616-0144
PO BOX 145, CHARLES CITY, IA 50616-0145
PO BOX 146, CHARLES CITY, IA 50616-0146
PO BOX 147, CHARLES CITY, IA 50616-0147
PO BOX 148, CHARLES CITY, IA 50616-0148
PO BOX 149, CHARLES CITY, IA 50616-0149
PO BOX 150, CHARLES CITY, IA 50616-0150
PO BOX 151, CHARLES CITY, IA 50616-0151
PO BOX 152, CHARLES CITY, IA 50616-0152
PO BOX 153, CHARLES CITY, IA 50616-0153
PO BOX 154, CHARLES CITY, IA 50616-0154
PO BOX 155, CHARLES CITY, IA 50616-0155
PO BOX 156, CHARLES CITY, IA 50616-0156
PO BOX 157, CHARLES CITY, IA 50616-0157
PO BOX 158, CHARLES CITY, IA 50616-0158
PO BOX 159, CHARLES CITY, IA 50616-0159
PO BOX 160, CHARLES CITY, IA 50616-0160
PO BOX 161, CHARLES CITY, IA 50616-0161
PO BOX 162, CHARLES CITY, IA 50616-0162
PO BOX 163, CHARLES CITY, IA 50616-0163
PO BOX 164, CHARLES CITY, IA 50616-0164
PO BOX 165, CHARLES CITY, IA 50616-0165
PO BOX 166, CHARLES CITY, IA 50616-0166
PO BOX 167, CHARLES CITY, IA 50616-0167
PO BOX 168, CHARLES CITY, IA 50616-0168
PO BOX 169, CHARLES CITY, IA 50616-0169
PO BOX 170, CHARLES CITY, IA 50616-0170
PO BOX 171, CHARLES CITY, IA 50616-0171
PO BOX 172, CHARLES CITY, IA 50616-0172
PO BOX 173, CHARLES CITY, IA 50616-0173
PO BOX 174, CHARLES CITY, IA 50616-0174
PO BOX 175, CHARLES CITY, IA 50616-0175
PO BOX 176, CHARLES CITY, IA 50616-0176
PO BOX 177, CHARLES CITY, IA 50616-0177
PO BOX 178, CHARLES CITY, IA 50616-0178
PO BOX 179, CHARLES CITY, IA 50616-0179
PO BOX 180, CHARLES CITY, IA 50616-0180
PO BOX 181, CHARLES CITY, IA 50616-0181
PO BOX 182, CHARLES CITY, IA 50616-0182
PO BOX 183, CHARLES CITY, IA 50616-0183
PO BOX 184, CHARLES CITY, IA 50616-0184
PO BOX 185, CHARLES CITY, IA 50616-0185
PO BOX 186, CHARLES CITY, IA 50616-0186
PO BOX 187, CHARLES CITY, IA 50616-0187
PO BOX 188, CHARLES CITY, IA 50616-0188
PO BOX 189, CHARLES CITY, IA 50616-0189
PO BOX 190, CHARLES CITY, IA 50616-0190
PO BOX 191, CHARLES CITY, IA 50616-0191
PO BOX 192, CHARLES CITY, IA 50616-0192
PO BOX 193, CHARLES CITY, IA 50616-0193
PO BOX 194, CHARLES CITY, IA 50616-0194
PO BOX 195, CHARLES CITY, IA 50616-0195
PO BOX 196, CHARLES CITY, IA 50616-0196
PO BOX 197, CHARLES CITY, IA 50616-0197
PO BOX 198, CHARLES CITY, IA 50616-0198
PO BOX 199, CHARLES CITY, IA 50616-0199
PO BOX 200, CHARLES CITY, IA 50616-0200
PO BOX 201, CHARLES CITY, IA 50616-0201
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