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 2, SAILOR SPRINGS, IL 62879-0002
PO BOX 3, SAILOR SPRINGS, IL 62879-0003
PO BOX 4, SAILOR SPRINGS, IL 62879-0004
PO BOX 5, SAILOR SPRINGS, IL 62879-0005
PO BOX 6, SAILOR SPRINGS, IL 62879-0006
PO BOX 7, SAILOR SPRINGS, IL 62879-0007
PO BOX 8, SAILOR SPRINGS, IL 62879-0008
PO BOX 9, SAILOR SPRINGS, IL 62879-0009
PO BOX 10, SAILOR SPRINGS, IL 62879-0010
PO BOX 11, SAILOR SPRINGS, IL 62879-0011
PO BOX 12, SAILOR SPRINGS, IL 62879-0012
PO BOX 13, SAILOR SPRINGS, IL 62879-0013
PO BOX 14, SAILOR SPRINGS, IL 62879-0014
PO BOX 15, SAILOR SPRINGS, IL 62879-0015
PO BOX 16, SAILOR SPRINGS, IL 62879-0016
PO BOX 17, SAILOR SPRINGS, IL 62879-0017
PO BOX 18, SAILOR SPRINGS, IL 62879-0018
PO BOX 19, SAILOR SPRINGS, IL 62879-0019
PO BOX 20, SAILOR SPRINGS, IL 62879-0020
PO BOX 21, SAILOR SPRINGS, IL 62879-0021
PO BOX 22, SAILOR SPRINGS, IL 62879-0022
PO BOX 23, SAILOR SPRINGS, IL 62879-0023
PO BOX 24, SAILOR SPRINGS, IL 62879-0024
PO BOX 25, SAILOR SPRINGS, IL 62879-0025
PO BOX 26, SAILOR SPRINGS, IL 62879-0026
PO BOX 27, SAILOR SPRINGS, IL 62879-0027
PO BOX 28, SAILOR SPRINGS, IL 62879-0028
PO BOX 29, SAILOR SPRINGS, IL 62879-0029
PO BOX 30, SAILOR SPRINGS, IL 62879-0030
PO BOX 31, SAILOR SPRINGS, IL 62879-0031
PO BOX 32, SAILOR SPRINGS, IL 62879-0032
PO BOX 33, SAILOR SPRINGS, IL 62879-0033
PO BOX 34, SAILOR SPRINGS, IL 62879-0034
PO BOX 35, SAILOR SPRINGS, IL 62879-0035
PO BOX 36, SAILOR SPRINGS, IL 62879-0036
PO BOX 37, SAILOR SPRINGS, IL 62879-0037
PO BOX 38, SAILOR SPRINGS, IL 62879-0038
PO BOX 39, SAILOR SPRINGS, IL 62879-0039
PO BOX 40, SAILOR SPRINGS, IL 62879-0040
PO BOX 41, SAILOR SPRINGS, IL 62879-0041
PO BOX 42, SAILOR SPRINGS, IL 62879-0042
PO BOX 43, SAILOR SPRINGS, IL 62879-0043
PO BOX 44, SAILOR SPRINGS, IL 62879-0044
PO BOX 45, SAILOR SPRINGS, IL 62879-0045
PO BOX 46, SAILOR SPRINGS, IL 62879-0046
PO BOX 47, SAILOR SPRINGS, IL 62879-0047
PO BOX 48, SAILOR SPRINGS, IL 62879-0048
PO BOX 49, SAILOR SPRINGS, IL 62879-0049
PO BOX 50, SAILOR SPRINGS, IL 62879-0050
PO BOX 51, SAILOR SPRINGS, IL 62879-0051
PO BOX 52, SAILOR SPRINGS, IL 62879-0052
PO BOX 53, SAILOR SPRINGS, IL 62879-0053
PO BOX 54, SAILOR SPRINGS, IL 62879-0054
PO BOX 55, SAILOR SPRINGS, IL 62879-0055
PO BOX 56, SAILOR SPRINGS, IL 62879-0056
PO BOX 57, SAILOR SPRINGS, IL 62879-0057
PO BOX 58, SAILOR SPRINGS, IL 62879-0058
PO BOX 59, SAILOR SPRINGS, IL 62879-0059
PO BOX 60, SAILOR SPRINGS, IL 62879-0060
PO BOX 61, SAILOR SPRINGS, IL 62879-0061
PO BOX 62, SAILOR SPRINGS, IL 62879-0062
PO BOX 63, SAILOR SPRINGS, IL 62879-0063
PO BOX 64, SAILOR SPRINGS, IL 62879-0064
PO BOX 65, SAILOR SPRINGS, IL 62879-0065
PO BOX 66, SAILOR SPRINGS, IL 62879-0066
PO BOX 67, SAILOR SPRINGS, IL 62879-0067
PO BOX 68, SAILOR SPRINGS, IL 62879-0068
PO BOX 69, SAILOR SPRINGS, IL 62879-0069
PO BOX 70, SAILOR SPRINGS, IL 62879-0070
PO BOX 71, SAILOR SPRINGS, IL 62879-0071
PO BOX 72, SAILOR SPRINGS, IL 62879-0072
PO BOX 73, SAILOR SPRINGS, IL 62879-0073
PO BOX 74, SAILOR SPRINGS, IL 62879-0074
PO BOX 75, SAILOR SPRINGS, IL 62879-0075
PO BOX 76, SAILOR SPRINGS, IL 62879-0076
PO BOX 77, SAILOR SPRINGS, IL 62879-0077
PO BOX 78, SAILOR SPRINGS, IL 62879-0078
PO BOX 79, SAILOR SPRINGS, IL 62879-0079
PO BOX 80, SAILOR SPRINGS, IL 62879-0080
PO BOX 81, SAILOR SPRINGS, IL 62879-0081
PO BOX 82, SAILOR SPRINGS, IL 62879-0082
PO BOX 83, SAILOR SPRINGS, IL 62879-0083
PO BOX 84, SAILOR SPRINGS, IL 62879-0084
PO BOX 85, SAILOR SPRINGS, IL 62879-0085
PO BOX 86, SAILOR SPRINGS, IL 62879-0086
PO BOX 87, SAILOR SPRINGS, IL 62879-0087
PO BOX 88, SAILOR SPRINGS, IL 62879-0088
PO BOX 89, SAILOR SPRINGS, IL 62879-0089
PO BOX 90, SAILOR SPRINGS, IL 62879-0090
PO BOX 91, SAILOR SPRINGS, IL 62879-0091
PO BOX 92, SAILOR SPRINGS, IL 62879-0092
PO BOX 93, SAILOR SPRINGS, IL 62879-0093
PO BOX 94, SAILOR SPRINGS, IL 62879-0094
PO BOX 95, SAILOR SPRINGS, IL 62879-0095
PO BOX 96, SAILOR SPRINGS, IL 62879-0096
PO BOX 97, SAILOR SPRINGS, IL 62879-0097
PO BOX 98, SAILOR SPRINGS, IL 62879-0098
PO BOX 99, SAILOR SPRINGS, IL 62879-0099
PO BOX 100, SAILOR SPRINGS, IL 62879-0100
PO BOX 101, SAILOR SPRINGS, IL 62879-0101
PO BOX 102, SAILOR SPRINGS, IL 62879-0102
PO BOX 103, SAILOR SPRINGS, IL 62879-0103
PO BOX 104, SAILOR SPRINGS, IL 62879-0104
PO BOX 105, SAILOR SPRINGS, IL 62879-0105
PO BOX 106, SAILOR SPRINGS, IL 62879-0106
PO BOX 107, SAILOR SPRINGS, IL 62879-0107
PO BOX 108, SAILOR SPRINGS, IL 62879-0108
PO BOX 109, SAILOR SPRINGS, IL 62879-0109
PO BOX 110, SAILOR SPRINGS, IL 62879-0110
PO BOX 111, SAILOR SPRINGS, IL 62879-0111
PO BOX 112, SAILOR SPRINGS, IL 62879-0112
PO BOX 113, SAILOR SPRINGS, IL 62879-0113
PO BOX 114, SAILOR SPRINGS, IL 62879-0114
PO BOX 115, SAILOR SPRINGS, IL 62879-0115
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