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, SAINT CHARLES, IA 50240-0001
PO BOX 2, SAINT CHARLES, IA 50240-0002
PO BOX 3, SAINT CHARLES, IA 50240-0003
PO BOX 4, SAINT CHARLES, IA 50240-0004
PO BOX 5, SAINT CHARLES, IA 50240-0005
PO BOX 6, SAINT CHARLES, IA 50240-0006
PO BOX 7, SAINT CHARLES, IA 50240-0007
PO BOX 8, SAINT CHARLES, IA 50240-0008
PO BOX 9, SAINT CHARLES, IA 50240-0009
PO BOX 10, SAINT CHARLES, IA 50240-0010
PO BOX 11, SAINT CHARLES, IA 50240-0011
PO BOX 12, SAINT CHARLES, IA 50240-0012
PO BOX 13, SAINT CHARLES, IA 50240-0013
PO BOX 14, SAINT CHARLES, IA 50240-0014
PO BOX 15, SAINT CHARLES, IA 50240-0015
PO BOX 16, SAINT CHARLES, IA 50240-0016
PO BOX 17, SAINT CHARLES, IA 50240-0017
PO BOX 18, SAINT CHARLES, IA 50240-0018
PO BOX 19, SAINT CHARLES, IA 50240-0019
PO BOX 20, SAINT CHARLES, IA 50240-0020
PO BOX 21, SAINT CHARLES, IA 50240-0021
PO BOX 22, SAINT CHARLES, IA 50240-0022
PO BOX 23, SAINT CHARLES, IA 50240-0023
PO BOX 24, SAINT CHARLES, IA 50240-0024
PO BOX 25, SAINT CHARLES, IA 50240-0025
PO BOX 26, SAINT CHARLES, IA 50240-0026
PO BOX 27, SAINT CHARLES, IA 50240-0027
PO BOX 28, SAINT CHARLES, IA 50240-0028
PO BOX 29, SAINT CHARLES, IA 50240-0029
PO BOX 30, SAINT CHARLES, IA 50240-0030
PO BOX 31, SAINT CHARLES, IA 50240-0031
PO BOX 32, SAINT CHARLES, IA 50240-0032
PO BOX 33, SAINT CHARLES, IA 50240-0033
PO BOX 34, SAINT CHARLES, IA 50240-0034
PO BOX 35, SAINT CHARLES, IA 50240-0035
PO BOX 36, SAINT CHARLES, IA 50240-0036
PO BOX 37, SAINT CHARLES, IA 50240-0037
PO BOX 38, SAINT CHARLES, IA 50240-0038
PO BOX 39, SAINT CHARLES, IA 50240-0039
PO BOX 40, SAINT CHARLES, IA 50240-0040
PO BOX 41, SAINT CHARLES, IA 50240-0041
PO BOX 42, SAINT CHARLES, IA 50240-0042
PO BOX 43, SAINT CHARLES, IA 50240-0043
PO BOX 44, SAINT CHARLES, IA 50240-0044
PO BOX 45, SAINT CHARLES, IA 50240-0045
PO BOX 46, SAINT CHARLES, IA 50240-0046
PO BOX 47, SAINT CHARLES, IA 50240-0047
PO BOX 48, SAINT CHARLES, IA 50240-0048
PO BOX 49, SAINT CHARLES, IA 50240-0049
PO BOX 50, SAINT CHARLES, IA 50240-0050
PO BOX 51, SAINT CHARLES, IA 50240-0051
PO BOX 52, SAINT CHARLES, IA 50240-0052
PO BOX 53, SAINT CHARLES, IA 50240-0053
PO BOX 54, SAINT CHARLES, IA 50240-0054
PO BOX 55, SAINT CHARLES, IA 50240-0055
PO BOX 56, SAINT CHARLES, IA 50240-0056
PO BOX 57, SAINT CHARLES, IA 50240-0057
PO BOX 58, SAINT CHARLES, IA 50240-0058
PO BOX 59, SAINT CHARLES, IA 50240-0059
PO BOX 60, SAINT CHARLES, IA 50240-0060
PO BOX 61, SAINT CHARLES, IA 50240-0061
PO BOX 62, SAINT CHARLES, IA 50240-0062
PO BOX 63, SAINT CHARLES, IA 50240-0063
PO BOX 64, SAINT CHARLES, IA 50240-0064
PO BOX 65, SAINT CHARLES, IA 50240-0065
PO BOX 66, SAINT CHARLES, IA 50240-0066
PO BOX 67, SAINT CHARLES, IA 50240-0067
PO BOX 68, SAINT CHARLES, IA 50240-0068
PO BOX 69, SAINT CHARLES, IA 50240-0069
PO BOX 70, SAINT CHARLES, IA 50240-0070
PO BOX 71, SAINT CHARLES, IA 50240-0071
PO BOX 72, SAINT CHARLES, IA 50240-0072
PO BOX 73, SAINT CHARLES, IA 50240-0073
PO BOX 74, SAINT CHARLES, IA 50240-0074
PO BOX 75, SAINT CHARLES, IA 50240-0075
PO BOX 76, SAINT CHARLES, IA 50240-0076
PO BOX 77, SAINT CHARLES, IA 50240-0077
PO BOX 78, SAINT CHARLES, IA 50240-0078
PO BOX 79, SAINT CHARLES, IA 50240-0079
PO BOX 80, SAINT CHARLES, IA 50240-0080
PO BOX 81, SAINT CHARLES, IA 50240-0081
PO BOX 82, SAINT CHARLES, IA 50240-0082
PO BOX 83, SAINT CHARLES, IA 50240-0083
PO BOX 84, SAINT CHARLES, IA 50240-0084
PO BOX 85, SAINT CHARLES, IA 50240-0085
PO BOX 86, SAINT CHARLES, IA 50240-0086
PO BOX 87, SAINT CHARLES, IA 50240-0087
PO BOX 88, SAINT CHARLES, IA 50240-0088
PO BOX 89, SAINT CHARLES, IA 50240-0089
PO BOX 90, SAINT CHARLES, IA 50240-0090
PO BOX 91, SAINT CHARLES, IA 50240-0091
PO BOX 92, SAINT CHARLES, IA 50240-0092
PO BOX 93, SAINT CHARLES, IA 50240-0093
PO BOX 94, SAINT CHARLES, IA 50240-0094
PO BOX 95, SAINT CHARLES, IA 50240-0095
PO BOX 96, SAINT CHARLES, IA 50240-0096
PO BOX 97, SAINT CHARLES, IA 50240-0097
PO BOX 98, SAINT CHARLES, IA 50240-0098
PO BOX 99, SAINT CHARLES, IA 50240-0099
PO BOX 100, SAINT CHARLES, IA 50240-0100
PO BOX 101, SAINT CHARLES, IA 50240-0101
PO BOX 102, SAINT CHARLES, IA 50240-0102
PO BOX 103, SAINT CHARLES, IA 50240-0103
PO BOX 104, SAINT CHARLES, IA 50240-0104
PO BOX 105, SAINT CHARLES, IA 50240-0105
PO BOX 106, SAINT CHARLES, IA 50240-0106
PO BOX 107, SAINT CHARLES, IA 50240-0107
PO BOX 108, SAINT CHARLES, IA 50240-0108
PO BOX 109, SAINT CHARLES, IA 50240-0109
PO BOX 110, SAINT CHARLES, IA 50240-0110
PO BOX 111, SAINT CHARLES, IA 50240-0111
PO BOX 112, SAINT CHARLES, IA 50240-0112
PO BOX 113, SAINT CHARLES, IA 50240-0113
PO BOX 114, SAINT CHARLES, IA 50240-0114
PO BOX 115, SAINT CHARLES, IA 50240-0115
PO BOX 116, SAINT CHARLES, IA 50240-0116
PO BOX 117, SAINT CHARLES, IA 50240-0117
PO BOX 118, SAINT CHARLES, IA 50240-0118
PO BOX 119, SAINT CHARLES, IA 50240-0119
PO BOX 120, SAINT CHARLES, IA 50240-0120
PO BOX 121, SAINT CHARLES, IA 50240-0121
PO BOX 122, SAINT CHARLES, IA 50240-0122
PO BOX 123, SAINT CHARLES, IA 50240-0123
PO BOX 124, SAINT CHARLES, IA 50240-0124
PO BOX 125, SAINT CHARLES, IA 50240-0125
PO BOX 126, SAINT CHARLES, IA 50240-0126
PO BOX 127, SAINT CHARLES, IA 50240-0127
PO BOX 128, SAINT CHARLES, IA 50240-0128
PO BOX 129, SAINT CHARLES, IA 50240-0129
PO BOX 130, SAINT CHARLES, IA 50240-0130
PO BOX 131, SAINT CHARLES, IA 50240-0131
PO BOX 132, SAINT CHARLES, IA 50240-0132
PO BOX 133, SAINT CHARLES, IA 50240-0133
PO BOX 134, SAINT CHARLES, IA 50240-0134
PO BOX 135, SAINT CHARLES, IA 50240-0135
PO BOX 136, SAINT CHARLES, IA 50240-0136
PO BOX 137, SAINT CHARLES, IA 50240-0137
PO BOX 138, SAINT CHARLES, IA 50240-0138
PO BOX 139, SAINT CHARLES, IA 50240-0139
PO BOX 140, SAINT CHARLES, IA 50240-0140
PO BOX 141, SAINT CHARLES, IA 50240-0141
PO BOX 142, SAINT CHARLES, IA 50240-0142
PO BOX 143, SAINT CHARLES, IA 50240-0143
PO BOX 144, SAINT CHARLES, IA 50240-0144
PO BOX 145, SAINT CHARLES, IA 50240-0145
PO BOX 146, SAINT CHARLES, IA 50240-0146
PO BOX 147, SAINT CHARLES, IA 50240-0147
PO BOX 148, SAINT CHARLES, IA 50240-0148
PO BOX 149, SAINT CHARLES, IA 50240-0149
PO BOX 150, SAINT CHARLES, IA 50240-0150
PO BOX 151, SAINT CHARLES, IA 50240-0151
PO BOX 152, SAINT CHARLES, IA 50240-0152
PO BOX 153, SAINT CHARLES, IA 50240-0153
PO BOX 154, SAINT CHARLES, IA 50240-0154
PO BOX 155, SAINT CHARLES, IA 50240-0155
PO BOX 156, SAINT CHARLES, IA 50240-0156
PO BOX 157, SAINT CHARLES, IA 50240-0157
PO BOX 158, SAINT CHARLES, IA 50240-0158
PO BOX 159, SAINT CHARLES, IA 50240-0159
PO BOX 160, SAINT CHARLES, IA 50240-0160
PO BOX 161, SAINT CHARLES, IA 50240-0161
PO BOX 162, SAINT CHARLES, IA 50240-0162
PO BOX 163, SAINT CHARLES, IA 50240-0163
PO BOX 164, SAINT CHARLES, IA 50240-0164
PO BOX 165, SAINT CHARLES, IA 50240-0165
PO BOX 166, SAINT CHARLES, IA 50240-0166
PO BOX 167, SAINT CHARLES, IA 50240-0167
PO BOX 168, SAINT CHARLES, IA 50240-0168
PO BOX 169, SAINT CHARLES, IA 50240-0169
PO BOX 170, SAINT CHARLES, IA 50240-0170
PO BOX 171, SAINT CHARLES, IA 50240-0171
PO BOX 172, SAINT CHARLES, IA 50240-0172
PO BOX 173, SAINT CHARLES, IA 50240-0173
PO BOX 174, SAINT CHARLES, IA 50240-0174
PO BOX 175, SAINT CHARLES, IA 50240-0175
PO BOX 176, SAINT CHARLES, IA 50240-0176
PO BOX 177, SAINT CHARLES, IA 50240-0177
PO BOX 178, SAINT CHARLES, IA 50240-0178
PO BOX 179, SAINT CHARLES, IA 50240-0179
PO BOX 180, SAINT CHARLES, IA 50240-0180
PO BOX 181, SAINT CHARLES, IA 50240-0181
PO BOX 182, SAINT CHARLES, IA 50240-0182
PO BOX 183, SAINT CHARLES, IA 50240-0183
PO BOX 184, SAINT CHARLES, IA 50240-0184
PO BOX 185, SAINT CHARLES, IA 50240-0185
PO BOX 186, SAINT CHARLES, IA 50240-0186
PO BOX 187, SAINT CHARLES, IA 50240-0187
PO BOX 188, SAINT CHARLES, IA 50240-0188
PO BOX 189, SAINT CHARLES, IA 50240-0189
PO BOX 190, SAINT CHARLES, IA 50240-0190
PO BOX 191, SAINT CHARLES, IA 50240-0191
PO BOX 192, SAINT CHARLES, IA 50240-0192
PO BOX 193, SAINT CHARLES, IA 50240-0193
PO BOX 194, SAINT CHARLES, IA 50240-0194
PO BOX 195, SAINT CHARLES, IA 50240-0195
PO BOX 196, SAINT CHARLES, IA 50240-0196
PO BOX 197, SAINT CHARLES, IA 50240-0197
PO BOX 198, SAINT CHARLES, IA 50240-0198
PO BOX 199, SAINT CHARLES, IA 50240-0199
PO BOX 200, SAINT CHARLES, IA 50240-0200
PO BOX 201, SAINT CHARLES, IA 50240-0201
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