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, MO 63302-0001
PO BOX 2, SAINT CHARLES, MO 63302-0002
PO BOX 3, SAINT CHARLES, MO 63302-0003
PO BOX 4, SAINT CHARLES, MO 63302-0004
PO BOX 5, SAINT CHARLES, MO 63302-0005
PO BOX 6, SAINT CHARLES, MO 63302-0006
PO BOX 7, SAINT CHARLES, MO 63302-0007
PO BOX 8, SAINT CHARLES, MO 63302-0008
PO BOX 9, SAINT CHARLES, MO 63302-0009
PO BOX 10, SAINT CHARLES, MO 63302-0010
PO BOX 11, SAINT CHARLES, MO 63302-0011
PO BOX 12, SAINT CHARLES, MO 63302-0012
PO BOX 13, SAINT CHARLES, MO 63302-0013
PO BOX 14, SAINT CHARLES, MO 63302-0014
PO BOX 15, SAINT CHARLES, MO 63302-0015
PO BOX 16, SAINT CHARLES, MO 63302-0016
PO BOX 17, SAINT CHARLES, MO 63302-0017
PO BOX 18, SAINT CHARLES, MO 63302-0018
PO BOX 19, SAINT CHARLES, MO 63302-0019
PO BOX 20, SAINT CHARLES, MO 63302-0020
PO BOX 21, SAINT CHARLES, MO 63302-0021
PO BOX 22, SAINT CHARLES, MO 63302-0022
PO BOX 23, SAINT CHARLES, MO 63302-0023
PO BOX 24, SAINT CHARLES, MO 63302-0024
PO BOX 25, SAINT CHARLES, MO 63302-0025
PO BOX 26, SAINT CHARLES, MO 63302-0026
PO BOX 27, SAINT CHARLES, MO 63302-0027
PO BOX 28, SAINT CHARLES, MO 63302-0028
PO BOX 29, SAINT CHARLES, MO 63302-0029
PO BOX 30, SAINT CHARLES, MO 63302-0030
PO BOX 31, SAINT CHARLES, MO 63302-0031
PO BOX 32, SAINT CHARLES, MO 63302-0032
PO BOX 33, SAINT CHARLES, MO 63302-0033
PO BOX 34, SAINT CHARLES, MO 63302-0034
PO BOX 35, SAINT CHARLES, MO 63302-0035
PO BOX 36, SAINT CHARLES, MO 63302-0036
PO BOX 37, SAINT CHARLES, MO 63302-0037
PO BOX 38, SAINT CHARLES, MO 63302-0038
PO BOX 39, SAINT CHARLES, MO 63302-0039
PO BOX 40, SAINT CHARLES, MO 63302-0040
PO BOX 41, SAINT CHARLES, MO 63302-0041
PO BOX 42, SAINT CHARLES, MO 63302-0042
PO BOX 43, SAINT CHARLES, MO 63302-0043
PO BOX 44, SAINT CHARLES, MO 63302-0044
PO BOX 45, SAINT CHARLES, MO 63302-0045
PO BOX 46, SAINT CHARLES, MO 63302-0046
PO BOX 47, SAINT CHARLES, MO 63302-0047
PO BOX 48, SAINT CHARLES, MO 63302-0048
PO BOX 49, SAINT CHARLES, MO 63302-0049
PO BOX 50, SAINT CHARLES, MO 63302-0050
PO BOX 51, SAINT CHARLES, MO 63302-0051
PO BOX 52, SAINT CHARLES, MO 63302-0052
PO BOX 53, SAINT CHARLES, MO 63302-0053
PO BOX 54, SAINT CHARLES, MO 63302-0054
PO BOX 55, SAINT CHARLES, MO 63302-0055
PO BOX 56, SAINT CHARLES, MO 63302-0056
PO BOX 57, SAINT CHARLES, MO 63302-0057
PO BOX 58, SAINT CHARLES, MO 63302-0058
PO BOX 59, SAINT CHARLES, MO 63302-0059
PO BOX 60, SAINT CHARLES, MO 63302-0060
PO BOX 61, SAINT CHARLES, MO 63302-0061
PO BOX 62, SAINT CHARLES, MO 63302-0062
PO BOX 63, SAINT CHARLES, MO 63302-0063
PO BOX 64, SAINT CHARLES, MO 63302-0064
PO BOX 65, SAINT CHARLES, MO 63302-0065
PO BOX 66, SAINT CHARLES, MO 63302-0066
PO BOX 67, SAINT CHARLES, MO 63302-0067
PO BOX 68, SAINT CHARLES, MO 63302-0068
PO BOX 69, SAINT CHARLES, MO 63302-0069
PO BOX 70, SAINT CHARLES, MO 63302-0070
PO BOX 71, SAINT CHARLES, MO 63302-0071
PO BOX 72, SAINT CHARLES, MO 63302-0072
PO BOX 73, SAINT CHARLES, MO 63302-0073
PO BOX 74, SAINT CHARLES, MO 63302-0074
PO BOX 75, SAINT CHARLES, MO 63302-0075
PO BOX 76, SAINT CHARLES, MO 63302-0076
PO BOX 77, SAINT CHARLES, MO 63302-0077
PO BOX 78, SAINT CHARLES, MO 63302-0078
PO BOX 79, SAINT CHARLES, MO 63302-0079
PO BOX 80, SAINT CHARLES, MO 63302-0080
PO BOX 81, SAINT CHARLES, MO 63302-0081
PO BOX 82, SAINT CHARLES, MO 63302-0082
PO BOX 83, SAINT CHARLES, MO 63302-0083
PO BOX 84, SAINT CHARLES, MO 63302-0084
PO BOX 85, SAINT CHARLES, MO 63302-0085
PO BOX 86, SAINT CHARLES, MO 63302-0086
PO BOX 87, SAINT CHARLES, MO 63302-0087
PO BOX 88, SAINT CHARLES, MO 63302-0088
PO BOX 89, SAINT CHARLES, MO 63302-0089
PO BOX 90, SAINT CHARLES, MO 63302-0090
PO BOX 91, SAINT CHARLES, MO 63302-0091
PO BOX 92, SAINT CHARLES, MO 63302-0092
PO BOX 93, SAINT CHARLES, MO 63302-0093
PO BOX 94, SAINT CHARLES, MO 63302-0094
PO BOX 95, SAINT CHARLES, MO 63302-0095
PO BOX 96, SAINT CHARLES, MO 63302-0096
PO BOX 97, SAINT CHARLES, MO 63302-0097
PO BOX 98, SAINT CHARLES, MO 63302-0098
PO BOX 99, SAINT CHARLES, MO 63302-0099
PO BOX 100, SAINT CHARLES, MO 63302-0100
PO BOX 101, SAINT CHARLES, MO 63302-0101
PO BOX 102, SAINT CHARLES, MO 63302-0102
PO BOX 103, SAINT CHARLES, MO 63302-0103
PO BOX 104, SAINT CHARLES, MO 63302-0104
PO BOX 105, SAINT CHARLES, MO 63302-0105
PO BOX 106, SAINT CHARLES, MO 63302-0106
PO BOX 107, SAINT CHARLES, MO 63302-0107
PO BOX 108, SAINT CHARLES, MO 63302-0108
PO BOX 109, SAINT CHARLES, MO 63302-0109
PO BOX 110, SAINT CHARLES, MO 63302-0110
PO BOX 111, SAINT CHARLES, MO 63302-0111
PO BOX 112, SAINT CHARLES, MO 63302-0112
PO BOX 113, SAINT CHARLES, MO 63302-0113
PO BOX 114, SAINT CHARLES, MO 63302-0114
PO BOX 115, SAINT CHARLES, MO 63302-0115
PO BOX 116, SAINT CHARLES, MO 63302-0116
PO BOX 117, SAINT CHARLES, MO 63302-0117
PO BOX 118, SAINT CHARLES, MO 63302-0118
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