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, GLENWOOD SPRINGS, CO 81602-0001
PO BOX 2, GLENWOOD SPRINGS, CO 81602-0002
PO BOX 3, GLENWOOD SPRINGS, CO 81602-0003
PO BOX 4, GLENWOOD SPRINGS, CO 81602-0004
PO BOX 5, GLENWOOD SPRINGS, CO 81602-0005
PO BOX 6, GLENWOOD SPRINGS, CO 81602-0006
PO BOX 7, GLENWOOD SPRINGS, CO 81602-0007
PO BOX 8, GLENWOOD SPRINGS, CO 81602-0008
PO BOX 9, GLENWOOD SPRINGS, CO 81602-0009
PO BOX 10, GLENWOOD SPRINGS, CO 81602-0010
PO BOX 11, GLENWOOD SPRINGS, CO 81602-0011
PO BOX 12, GLENWOOD SPRINGS, CO 81602-0012
PO BOX 13, GLENWOOD SPRINGS, CO 81602-0013
PO BOX 14, GLENWOOD SPRINGS, CO 81602-0014
PO BOX 15, GLENWOOD SPRINGS, CO 81602-0015
PO BOX 16, GLENWOOD SPRINGS, CO 81602-0016
PO BOX 17, GLENWOOD SPRINGS, CO 81602-0017
PO BOX 18, GLENWOOD SPRINGS, CO 81602-0018
PO BOX 19, GLENWOOD SPRINGS, CO 81602-0019
PO BOX 20, GLENWOOD SPRINGS, CO 81602-0020
PO BOX 21, GLENWOOD SPRINGS, CO 81602-0021
PO BOX 22, GLENWOOD SPRINGS, CO 81602-0022
PO BOX 23, GLENWOOD SPRINGS, CO 81602-0023
PO BOX 24, GLENWOOD SPRINGS, CO 81602-0024
PO BOX 25, GLENWOOD SPRINGS, CO 81602-0025
PO BOX 26, GLENWOOD SPRINGS, CO 81602-0026
PO BOX 27, GLENWOOD SPRINGS, CO 81602-0027
PO BOX 28, GLENWOOD SPRINGS, CO 81602-0028
PO BOX 29, GLENWOOD SPRINGS, CO 81602-0029
PO BOX 30, GLENWOOD SPRINGS, CO 81602-0030
PO BOX 31, GLENWOOD SPRINGS, CO 81602-0031
PO BOX 32, GLENWOOD SPRINGS, CO 81602-0032
PO BOX 33, GLENWOOD SPRINGS, CO 81602-0033
PO BOX 34, GLENWOOD SPRINGS, CO 81602-0034
PO BOX 35, GLENWOOD SPRINGS, CO 81602-0035
PO BOX 36, GLENWOOD SPRINGS, CO 81602-0036
PO BOX 37, GLENWOOD SPRINGS, CO 81602-0037
PO BOX 38, GLENWOOD SPRINGS, CO 81602-0038
PO BOX 39, GLENWOOD SPRINGS, CO 81602-0039
PO BOX 40, GLENWOOD SPRINGS, CO 81602-0040
PO BOX 41, GLENWOOD SPRINGS, CO 81602-0041
PO BOX 42, GLENWOOD SPRINGS, CO 81602-0042
PO BOX 43, GLENWOOD SPRINGS, CO 81602-0043
PO BOX 44, GLENWOOD SPRINGS, CO 81602-0044
PO BOX 45, GLENWOOD SPRINGS, CO 81602-0045
PO BOX 46, GLENWOOD SPRINGS, CO 81602-0046
PO BOX 47, GLENWOOD SPRINGS, CO 81602-0047
PO BOX 48, GLENWOOD SPRINGS, CO 81602-0048
PO BOX 49, GLENWOOD SPRINGS, CO 81602-0049
PO BOX 50, GLENWOOD SPRINGS, CO 81602-0050
PO BOX 51, GLENWOOD SPRINGS, CO 81602-0051
PO BOX 52, GLENWOOD SPRINGS, CO 81602-0052
PO BOX 53, GLENWOOD SPRINGS, CO 81602-0053
PO BOX 54, GLENWOOD SPRINGS, CO 81602-0054
PO BOX 55, GLENWOOD SPRINGS, CO 81602-0055
PO BOX 56, GLENWOOD SPRINGS, CO 81602-0056
PO BOX 57, GLENWOOD SPRINGS, CO 81602-0057
PO BOX 58, GLENWOOD SPRINGS, CO 81602-0058
PO BOX 59, GLENWOOD SPRINGS, CO 81602-0059
PO BOX 60, GLENWOOD SPRINGS, CO 81602-0060
PO BOX 61, GLENWOOD SPRINGS, CO 81602-0061
PO BOX 62, GLENWOOD SPRINGS, CO 81602-0062
PO BOX 63, GLENWOOD SPRINGS, CO 81602-0063
PO BOX 64, GLENWOOD SPRINGS, CO 81602-0064
PO BOX 65, GLENWOOD SPRINGS, CO 81602-0065
PO BOX 66, GLENWOOD SPRINGS, CO 81602-0066
PO BOX 67, GLENWOOD SPRINGS, CO 81602-0067
PO BOX 68, GLENWOOD SPRINGS, CO 81602-0068
PO BOX 69, GLENWOOD SPRINGS, CO 81602-0069
PO BOX 70, GLENWOOD SPRINGS, CO 81602-0070
PO BOX 71, GLENWOOD SPRINGS, CO 81602-0071
PO BOX 72, GLENWOOD SPRINGS, CO 81602-0072
PO BOX 73, GLENWOOD SPRINGS, CO 81602-0073
PO BOX 74, GLENWOOD SPRINGS, CO 81602-0074
PO BOX 75, GLENWOOD SPRINGS, CO 81602-0075
PO BOX 76, GLENWOOD SPRINGS, CO 81602-0076
PO BOX 77, GLENWOOD SPRINGS, CO 81602-0077
PO BOX 78, GLENWOOD SPRINGS, CO 81602-0078
PO BOX 79, GLENWOOD SPRINGS, CO 81602-0079
PO BOX 80, GLENWOOD SPRINGS, CO 81602-0080
PO BOX 81, GLENWOOD SPRINGS, CO 81602-0081
PO BOX 82, GLENWOOD SPRINGS, CO 81602-0082
PO BOX 83, GLENWOOD SPRINGS, CO 81602-0083
PO BOX 84, GLENWOOD SPRINGS, CO 81602-0084
PO BOX 85, GLENWOOD SPRINGS, CO 81602-0085
PO BOX 86, GLENWOOD SPRINGS, CO 81602-0086
PO BOX 87, GLENWOOD SPRINGS, CO 81602-0087
PO BOX 88, GLENWOOD SPRINGS, CO 81602-0088
PO BOX 89, GLENWOOD SPRINGS, CO 81602-0089
PO BOX 90, GLENWOOD SPRINGS, CO 81602-0090
PO BOX 91, GLENWOOD SPRINGS, CO 81602-0091
PO BOX 92, GLENWOOD SPRINGS, CO 81602-0092
PO BOX 93, GLENWOOD SPRINGS, CO 81602-0093
PO BOX 94, GLENWOOD SPRINGS, CO 81602-0094
PO BOX 95, GLENWOOD SPRINGS, CO 81602-0095
PO BOX 96, GLENWOOD SPRINGS, CO 81602-0096
PO BOX 97, GLENWOOD SPRINGS, CO 81602-0097
PO BOX 98, GLENWOOD SPRINGS, CO 81602-0098
PO BOX 99, GLENWOOD SPRINGS, CO 81602-0099
PO BOX 100, GLENWOOD SPRINGS, CO 81602-0100
PO BOX 101, GLENWOOD SPRINGS, CO 81602-0101
PO BOX 102, GLENWOOD SPRINGS, CO 81602-0102
PO BOX 103, GLENWOOD SPRINGS, CO 81602-0103
PO BOX 104, GLENWOOD SPRINGS, CO 81602-0104
PO BOX 105, GLENWOOD SPRINGS, CO 81602-0105
PO BOX 106, GLENWOOD SPRINGS, CO 81602-0106
PO BOX 107, GLENWOOD SPRINGS, CO 81602-0107
PO BOX 108, GLENWOOD SPRINGS, CO 81602-0108
PO BOX 109, GLENWOOD SPRINGS, CO 81602-0109
PO BOX 110, GLENWOOD SPRINGS, CO 81602-0110
PO BOX 111, GLENWOOD SPRINGS, CO 81602-0111
PO BOX 112, GLENWOOD SPRINGS, CO 81602-0112
PO BOX 113, GLENWOOD SPRINGS, CO 81602-0113
PO BOX 114, GLENWOOD SPRINGS, CO 81602-0114
PO BOX 115, GLENWOOD SPRINGS, CO 81602-0115
PO BOX 116, GLENWOOD SPRINGS, CO 81602-0116
PO BOX 117, GLENWOOD SPRINGS, CO 81602-0117
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