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, COMMERCE CITY, CO 80037-0001
PO BOX 2, COMMERCE CITY, CO 80037-0002
PO BOX 3, COMMERCE CITY, CO 80037-0003
PO BOX 4, COMMERCE CITY, CO 80037-0004
PO BOX 5, COMMERCE CITY, CO 80037-0005
PO BOX 6, COMMERCE CITY, CO 80037-0006
PO BOX 7, COMMERCE CITY, CO 80037-0007
PO BOX 8, COMMERCE CITY, CO 80037-0008
PO BOX 9, COMMERCE CITY, CO 80037-0009
PO BOX 10, COMMERCE CITY, CO 80037-0010
PO BOX 11, COMMERCE CITY, CO 80037-0011
PO BOX 12, COMMERCE CITY, CO 80037-0012
PO BOX 13, COMMERCE CITY, CO 80037-0013
PO BOX 14, COMMERCE CITY, CO 80037-0014
PO BOX 15, COMMERCE CITY, CO 80037-0015
PO BOX 16, COMMERCE CITY, CO 80037-0016
PO BOX 17, COMMERCE CITY, CO 80037-0017
PO BOX 18, COMMERCE CITY, CO 80037-0018
PO BOX 19, COMMERCE CITY, CO 80037-0019
PO BOX 20, COMMERCE CITY, CO 80037-0020
PO BOX 21, COMMERCE CITY, CO 80037-0021
PO BOX 22, COMMERCE CITY, CO 80037-0022
PO BOX 23, COMMERCE CITY, CO 80037-0023
PO BOX 24, COMMERCE CITY, CO 80037-0024
PO BOX 25, COMMERCE CITY, CO 80037-0025
PO BOX 26, COMMERCE CITY, CO 80037-0026
PO BOX 27, COMMERCE CITY, CO 80037-0027
PO BOX 28, COMMERCE CITY, CO 80037-0028
PO BOX 29, COMMERCE CITY, CO 80037-0029
PO BOX 30, COMMERCE CITY, CO 80037-0030
PO BOX 31, COMMERCE CITY, CO 80037-0031
PO BOX 32, COMMERCE CITY, CO 80037-0032
PO BOX 33, COMMERCE CITY, CO 80037-0033
PO BOX 34, COMMERCE CITY, CO 80037-0034
PO BOX 35, COMMERCE CITY, CO 80037-0035
PO BOX 36, COMMERCE CITY, CO 80037-0036
PO BOX 37, COMMERCE CITY, CO 80037-0037
PO BOX 38, COMMERCE CITY, CO 80037-0038
PO BOX 39, COMMERCE CITY, CO 80037-0039
PO BOX 40, COMMERCE CITY, CO 80037-0040
PO BOX 41, COMMERCE CITY, CO 80037-0041
PO BOX 42, COMMERCE CITY, CO 80037-0042
PO BOX 43, COMMERCE CITY, CO 80037-0043
PO BOX 44, COMMERCE CITY, CO 80037-0044
PO BOX 45, COMMERCE CITY, CO 80037-0045
PO BOX 46, COMMERCE CITY, CO 80037-0046
PO BOX 47, COMMERCE CITY, CO 80037-0047
PO BOX 48, COMMERCE CITY, CO 80037-0048
PO BOX 49, COMMERCE CITY, CO 80037-0049
PO BOX 50, COMMERCE CITY, CO 80037-0050
PO BOX 51, COMMERCE CITY, CO 80037-0051
PO BOX 52, COMMERCE CITY, CO 80037-0052
PO BOX 53, COMMERCE CITY, CO 80037-0053
PO BOX 54, COMMERCE CITY, CO 80037-0054
PO BOX 55, COMMERCE CITY, CO 80037-0055
PO BOX 56, COMMERCE CITY, CO 80037-0056
PO BOX 57, COMMERCE CITY, CO 80037-0057
PO BOX 58, COMMERCE CITY, CO 80037-0058
PO BOX 59, COMMERCE CITY, CO 80037-0059
PO BOX 60, COMMERCE CITY, CO 80037-0060
PO BOX 61, COMMERCE CITY, CO 80037-0061
PO BOX 62, COMMERCE CITY, CO 80037-0062
PO BOX 63, COMMERCE CITY, CO 80037-0063
PO BOX 64, COMMERCE CITY, CO 80037-0064
PO BOX 65, COMMERCE CITY, CO 80037-0065
PO BOX 66, COMMERCE CITY, CO 80037-0066
PO BOX 67, COMMERCE CITY, CO 80037-0067
PO BOX 68, COMMERCE CITY, CO 80037-0068
PO BOX 69, COMMERCE CITY, CO 80037-0069
PO BOX 70, COMMERCE CITY, CO 80037-0070
PO BOX 71, COMMERCE CITY, CO 80037-0071
PO BOX 72, COMMERCE CITY, CO 80037-0072
PO BOX 73, COMMERCE CITY, CO 80037-0073
PO BOX 74, COMMERCE CITY, CO 80037-0074
PO BOX 75, COMMERCE CITY, CO 80037-0075
PO BOX 76, COMMERCE CITY, CO 80037-0076
PO BOX 77, COMMERCE CITY, CO 80037-0077
PO BOX 78, COMMERCE CITY, CO 80037-0078
PO BOX 79, COMMERCE CITY, CO 80037-0079
PO BOX 80, COMMERCE CITY, CO 80037-0080
PO BOX 81, COMMERCE CITY, CO 80037-0081
PO BOX 82, COMMERCE CITY, CO 80037-0082
PO BOX 83, COMMERCE CITY, CO 80037-0083
PO BOX 84, COMMERCE CITY, CO 80037-0084
PO BOX 85, COMMERCE CITY, CO 80037-0085
PO BOX 86, COMMERCE CITY, CO 80037-0086
PO BOX 87, COMMERCE CITY, CO 80037-0087
PO BOX 88, COMMERCE CITY, CO 80037-0088
PO BOX 89, COMMERCE CITY, CO 80037-0089
PO BOX 90, COMMERCE CITY, CO 80037-0090
PO BOX 91, COMMERCE CITY, CO 80037-0091
PO BOX 92, COMMERCE CITY, CO 80037-0092
PO BOX 93, COMMERCE CITY, CO 80037-0093
PO BOX 94, COMMERCE CITY, CO 80037-0094
PO BOX 95, COMMERCE CITY, CO 80037-0095
PO BOX 96, COMMERCE CITY, CO 80037-0096
PO BOX 97, COMMERCE CITY, CO 80037-0097
PO BOX 98, COMMERCE CITY, CO 80037-0098
PO BOX 99, COMMERCE CITY, CO 80037-0099
PO BOX 100, COMMERCE CITY, CO 80037-0100
PO BOX 101, COMMERCE CITY, CO 80037-0101
PO BOX 102, COMMERCE CITY, CO 80037-0102
PO BOX 103, COMMERCE CITY, CO 80037-0103
PO BOX 104, COMMERCE CITY, CO 80037-0104
PO BOX 105, COMMERCE CITY, CO 80037-0105
PO BOX 106, COMMERCE CITY, CO 80037-0106
PO BOX 107, COMMERCE CITY, CO 80037-0107
PO BOX 108, COMMERCE CITY, CO 80037-0108
PO BOX 109, COMMERCE CITY, CO 80037-0109
PO BOX 110, COMMERCE CITY, CO 80037-0110
PO BOX 111, COMMERCE CITY, CO 80037-0111
PO BOX 112, COMMERCE CITY, CO 80037-0112
PO BOX 113, COMMERCE CITY, CO 80037-0113
PO BOX 114, COMMERCE CITY, CO 80037-0114
PO BOX 115, COMMERCE CITY, CO 80037-0115
PO BOX 116, COMMERCE CITY, CO 80037-0116
PO BOX 117, COMMERCE CITY, CO 80037-0117
PO BOX 118, COMMERCE CITY, CO 80037-0118
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