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, GRAND JUNCTION, CO 81502-0001
PO BOX 2, GRAND JUNCTION, CO 81502-0002
PO BOX 3, GRAND JUNCTION, CO 81502-0003
PO BOX 4, GRAND JUNCTION, CO 81502-0004
PO BOX 5, GRAND JUNCTION, CO 81502-0005
PO BOX 6, GRAND JUNCTION, CO 81502-0006
PO BOX 7, GRAND JUNCTION, CO 81502-0007
PO BOX 8, GRAND JUNCTION, CO 81502-0008
PO BOX 9, GRAND JUNCTION, CO 81502-0009
PO BOX 10, GRAND JUNCTION, CO 81502-0010
PO BOX 11, GRAND JUNCTION, CO 81502-0011
PO BOX 12, GRAND JUNCTION, CO 81502-0012
PO BOX 13, GRAND JUNCTION, CO 81502-0013
PO BOX 14, GRAND JUNCTION, CO 81502-0014
PO BOX 15, GRAND JUNCTION, CO 81502-0015
PO BOX 16, GRAND JUNCTION, CO 81502-0016
PO BOX 17, GRAND JUNCTION, CO 81502-0017
PO BOX 18, GRAND JUNCTION, CO 81502-0018
PO BOX 19, GRAND JUNCTION, CO 81502-0019
PO BOX 20, GRAND JUNCTION, CO 81502-0020
PO BOX 21, GRAND JUNCTION, CO 81502-0021
PO BOX 22, GRAND JUNCTION, CO 81502-0022
PO BOX 23, GRAND JUNCTION, CO 81502-0023
PO BOX 24, GRAND JUNCTION, CO 81502-0024
PO BOX 25, GRAND JUNCTION, CO 81502-0025
PO BOX 26, GRAND JUNCTION, CO 81502-0026
PO BOX 27, GRAND JUNCTION, CO 81502-0027
PO BOX 28, GRAND JUNCTION, CO 81502-0028
PO BOX 29, GRAND JUNCTION, CO 81502-0029
PO BOX 30, GRAND JUNCTION, CO 81502-0030
PO BOX 31, GRAND JUNCTION, CO 81502-0031
PO BOX 32, GRAND JUNCTION, CO 81502-0032
PO BOX 33, GRAND JUNCTION, CO 81502-0033
PO BOX 34, GRAND JUNCTION, CO 81502-0034
PO BOX 35, GRAND JUNCTION, CO 81502-0035
PO BOX 36, GRAND JUNCTION, CO 81502-0036
PO BOX 37, GRAND JUNCTION, CO 81502-0037
PO BOX 38, GRAND JUNCTION, CO 81502-0038
PO BOX 39, GRAND JUNCTION, CO 81502-0039
PO BOX 40, GRAND JUNCTION, CO 81502-0040
PO BOX 41, GRAND JUNCTION, CO 81502-0041
PO BOX 42, GRAND JUNCTION, CO 81502-0042
PO BOX 43, GRAND JUNCTION, CO 81502-0043
PO BOX 44, GRAND JUNCTION, CO 81502-0044
PO BOX 45, GRAND JUNCTION, CO 81502-0045
PO BOX 46, GRAND JUNCTION, CO 81502-0046
PO BOX 47, GRAND JUNCTION, CO 81502-0047
PO BOX 48, GRAND JUNCTION, CO 81502-0048
PO BOX 49, GRAND JUNCTION, CO 81502-0049
PO BOX 50, GRAND JUNCTION, CO 81502-0050
PO BOX 51, GRAND JUNCTION, CO 81502-0051
PO BOX 52, GRAND JUNCTION, CO 81502-0052
PO BOX 53, GRAND JUNCTION, CO 81502-0053
PO BOX 54, GRAND JUNCTION, CO 81502-0054
PO BOX 55, GRAND JUNCTION, CO 81502-0055
PO BOX 56, GRAND JUNCTION, CO 81502-0056
PO BOX 57, GRAND JUNCTION, CO 81502-0057
PO BOX 58, GRAND JUNCTION, CO 81502-0058
PO BOX 59, GRAND JUNCTION, CO 81502-0059
PO BOX 60, GRAND JUNCTION, CO 81502-0060
PO BOX 61, GRAND JUNCTION, CO 81502-0061
PO BOX 62, GRAND JUNCTION, CO 81502-0062
PO BOX 63, GRAND JUNCTION, CO 81502-0063
PO BOX 64, GRAND JUNCTION, CO 81502-0064
PO BOX 65, GRAND JUNCTION, CO 81502-0065
PO BOX 66, GRAND JUNCTION, CO 81502-0066
PO BOX 67, GRAND JUNCTION, CO 81502-0067
PO BOX 68, GRAND JUNCTION, CO 81502-0068
PO BOX 69, GRAND JUNCTION, CO 81502-0069
PO BOX 70, GRAND JUNCTION, CO 81502-0070
PO BOX 71, GRAND JUNCTION, CO 81502-0071
PO BOX 72, GRAND JUNCTION, CO 81502-0072
PO BOX 73, GRAND JUNCTION, CO 81502-0073
PO BOX 74, GRAND JUNCTION, CO 81502-0074
PO BOX 75, GRAND JUNCTION, CO 81502-0075
PO BOX 76, GRAND JUNCTION, CO 81502-0076
PO BOX 77, GRAND JUNCTION, CO 81502-0077
PO BOX 78, GRAND JUNCTION, CO 81502-0078
PO BOX 79, GRAND JUNCTION, CO 81502-0079
PO BOX 80, GRAND JUNCTION, CO 81502-0080
PO BOX 81, GRAND JUNCTION, CO 81502-0081
PO BOX 82, GRAND JUNCTION, CO 81502-0082
PO BOX 83, GRAND JUNCTION, CO 81502-0083
PO BOX 84, GRAND JUNCTION, CO 81502-0084
PO BOX 85, GRAND JUNCTION, CO 81502-0085
PO BOX 86, GRAND JUNCTION, CO 81502-0086
PO BOX 87, GRAND JUNCTION, CO 81502-0087
PO BOX 88, GRAND JUNCTION, CO 81502-0088
PO BOX 89, GRAND JUNCTION, CO 81502-0089
PO BOX 90, GRAND JUNCTION, CO 81502-0090
PO BOX 91, GRAND JUNCTION, CO 81502-0091
PO BOX 92, GRAND JUNCTION, CO 81502-0092
PO BOX 93, GRAND JUNCTION, CO 81502-0093
PO BOX 94, GRAND JUNCTION, CO 81502-0094
PO BOX 95, GRAND JUNCTION, CO 81502-0095
PO BOX 96, GRAND JUNCTION, CO 81502-0096
PO BOX 97, GRAND JUNCTION, CO 81502-0097
PO BOX 98, GRAND JUNCTION, CO 81502-0098
PO BOX 99, GRAND JUNCTION, CO 81502-0099
PO BOX 100, GRAND JUNCTION, CO 81502-0100
PO BOX 101, GRAND JUNCTION, CO 81502-0101
PO BOX 102, GRAND JUNCTION, CO 81502-0102
PO BOX 103, GRAND JUNCTION, CO 81502-0103
PO BOX 104, GRAND JUNCTION, CO 81502-0104
PO BOX 105, GRAND JUNCTION, CO 81502-0105
PO BOX 106, GRAND JUNCTION, CO 81502-0106
PO BOX 107, GRAND JUNCTION, CO 81502-0107
PO BOX 108, GRAND JUNCTION, CO 81502-0108
PO BOX 109, GRAND JUNCTION, CO 81502-0109
PO BOX 110, GRAND JUNCTION, CO 81502-0110
PO BOX 111, GRAND JUNCTION, CO 81502-0111
PO BOX 112, GRAND JUNCTION, CO 81502-0112
PO BOX 113, GRAND JUNCTION, CO 81502-0113
PO BOX 114, GRAND JUNCTION, CO 81502-0114
PO BOX 115, GRAND JUNCTION, CO 81502-0115
PO BOX 116, GRAND JUNCTION, CO 81502-0116
PO BOX 117, GRAND JUNCTION, CO 81502-0117
PO BOX 118, GRAND JUNCTION, CO 81502-0118
PO BOX 119, GRAND JUNCTION, CO 81502-0119
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