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, GRANT, CO 80448-0001
PO BOX 2, GRANT, CO 80448-0002
PO BOX 3, GRANT, CO 80448-0003
PO BOX 4, GRANT, CO 80448-0004
PO BOX 5, GRANT, CO 80448-0005
PO BOX 6, GRANT, CO 80448-0006
PO BOX 7, GRANT, CO 80448-0007
PO BOX 8, GRANT, CO 80448-0008
PO BOX 9, GRANT, CO 80448-0009
PO BOX 10, GRANT, CO 80448-0010
PO BOX 11, GRANT, CO 80448-0011
PO BOX 12, GRANT, CO 80448-0012
PO BOX 13, GRANT, CO 80448-0013
PO BOX 14, GRANT, CO 80448-0014
PO BOX 15, GRANT, CO 80448-0015
PO BOX 16, GRANT, CO 80448-0016
PO BOX 17, GRANT, CO 80448-0017
PO BOX 18, GRANT, CO 80448-0018
PO BOX 19, GRANT, CO 80448-0019
PO BOX 20, GRANT, CO 80448-0020
PO BOX 21, GRANT, CO 80448-0021
PO BOX 22, GRANT, CO 80448-0022
PO BOX 23, GRANT, CO 80448-0023
PO BOX 24, GRANT, CO 80448-0024
PO BOX 25, GRANT, CO 80448-0025
PO BOX 26, GRANT, CO 80448-0026
PO BOX 27, GRANT, CO 80448-0027
PO BOX 28, GRANT, CO 80448-0028
PO BOX 29, GRANT, CO 80448-0029
PO BOX 30, GRANT, CO 80448-0030
PO BOX 31, GRANT, CO 80448-0031
PO BOX 32, GRANT, CO 80448-0032
PO BOX 33, GRANT, CO 80448-0033
PO BOX 34, GRANT, CO 80448-0034
PO BOX 35, GRANT, CO 80448-0035
PO BOX 36, GRANT, CO 80448-0036
PO BOX 37, GRANT, CO 80448-0037
PO BOX 38, GRANT, CO 80448-0038
PO BOX 39, GRANT, CO 80448-0039
PO BOX 40, GRANT, CO 80448-0040
PO BOX 41, GRANT, CO 80448-0041
PO BOX 42, GRANT, CO 80448-0042
PO BOX 43, GRANT, CO 80448-0043
PO BOX 44, GRANT, CO 80448-0044
PO BOX 45, GRANT, CO 80448-0045
PO BOX 46, GRANT, CO 80448-0046
PO BOX 47, GRANT, CO 80448-0047
PO BOX 48, GRANT, CO 80448-0048
PO BOX 49, GRANT, CO 80448-0049
PO BOX 50, GRANT, CO 80448-0050
PO BOX 51, GRANT, CO 80448-0051
PO BOX 52, GRANT, CO 80448-0052
PO BOX 53, GRANT, CO 80448-0053
PO BOX 54, GRANT, CO 80448-0054
PO BOX 55, GRANT, CO 80448-0055
PO BOX 56, GRANT, CO 80448-0056
PO BOX 57, GRANT, CO 80448-0057
PO BOX 58, GRANT, CO 80448-0058
PO BOX 59, GRANT, CO 80448-0059
PO BOX 60, GRANT, CO 80448-0060
PO BOX 61, GRANT, CO 80448-0061
PO BOX 62, GRANT, CO 80448-0062
PO BOX 63, GRANT, CO 80448-0063
PO BOX 64, GRANT, CO 80448-0064
PO BOX 65, GRANT, CO 80448-0065
PO BOX 66, GRANT, CO 80448-0066
PO BOX 67, GRANT, CO 80448-0067
PO BOX 68, GRANT, CO 80448-0068
PO BOX 69, GRANT, CO 80448-0069
PO BOX 70, GRANT, CO 80448-0070
PO BOX 71, GRANT, CO 80448-0071
PO BOX 72, GRANT, CO 80448-0072
PO BOX 73, GRANT, CO 80448-0073
PO BOX 74, GRANT, CO 80448-0074
PO BOX 75, GRANT, CO 80448-0075
PO BOX 76, GRANT, CO 80448-0076
PO BOX 77, GRANT, CO 80448-0077
PO BOX 78, GRANT, CO 80448-0078
PO BOX 79, GRANT, CO 80448-0079
PO BOX 80, GRANT, CO 80448-0080
PO BOX 81, GRANT, CO 80448-0081
PO BOX 82, GRANT, CO 80448-0082
PO BOX 83, GRANT, CO 80448-0083
PO BOX 84, GRANT, CO 80448-0084
PO BOX 85, GRANT, CO 80448-0085
PO BOX 86, GRANT, CO 80448-0086
PO BOX 87, GRANT, CO 80448-0087
PO BOX 88, GRANT, CO 80448-0088
PO BOX 89, GRANT, CO 80448-0089
PO BOX 90, GRANT, CO 80448-0090
PO BOX 91, GRANT, CO 80448-0091
PO BOX 92, GRANT, CO 80448-0092
PO BOX 93, GRANT, CO 80448-0093
PO BOX 94, GRANT, CO 80448-0094
PO BOX 95, GRANT, CO 80448-0095
PO BOX 96, GRANT, CO 80448-0096
PO BOX 97, GRANT, CO 80448-0097
PO BOX 98, GRANT, CO 80448-0098
PO BOX 99, GRANT, CO 80448-0099
PO BOX 100, GRANT, CO 80448-0100
PO BOX 101, GRANT, CO 80448-0101
PO BOX 102, GRANT, CO 80448-0102
PO BOX 103, GRANT, CO 80448-0103
PO BOX 104, GRANT, CO 80448-0104
PO BOX 105, GRANT, CO 80448-0105
PO BOX 106, GRANT, CO 80448-0106
PO BOX 107, GRANT, CO 80448-0107
PO BOX 108, GRANT, CO 80448-0108
PO BOX 109, GRANT, CO 80448-0109
PO BOX 110, GRANT, CO 80448-0110
PO BOX 111, GRANT, CO 80448-0111
PO BOX 112, GRANT, CO 80448-0112
PO BOX 113, GRANT, CO 80448-0113
PO BOX 114, GRANT, CO 80448-0114
PO BOX 115, GRANT, CO 80448-0115
PO BOX 116, GRANT, CO 80448-0116
PO BOX 117, GRANT, CO 80448-0117
PO BOX 118, GRANT, CO 80448-0118
PO BOX 119, GRANT, CO 80448-0119
PO BOX 120, GRANT, CO 80448-0120
PO BOX 121, GRANT, CO 80448-0121
PO BOX 122, GRANT, CO 80448-0122
PO BOX 123, GRANT, CO 80448-0123
PO BOX 124, GRANT, CO 80448-0124
PO BOX 125, GRANT, CO 80448-0125
PO BOX 126, GRANT, CO 80448-0126
PO BOX 127, GRANT, CO 80448-0127
PO BOX 128, GRANT, CO 80448-0128
PO BOX 129, GRANT, CO 80448-0129
PO BOX 130, GRANT, CO 80448-0130
PO BOX 131, GRANT, CO 80448-0131
PO BOX 132, GRANT, CO 80448-0132
PO BOX 133, GRANT, CO 80448-0133
PO BOX 134, GRANT, CO 80448-0134
PO BOX 135, GRANT, CO 80448-0135
PO BOX 136, GRANT, CO 80448-0136
PO BOX 137, GRANT, CO 80448-0137
PO BOX 138, GRANT, CO 80448-0138
PO BOX 139, GRANT, CO 80448-0139
PO BOX 140, GRANT, CO 80448-0140
PO BOX 141, GRANT, CO 80448-0141
PO BOX 142, GRANT, CO 80448-0142
PO BOX 143, GRANT, CO 80448-0143
PO BOX 144, GRANT, CO 80448-0144
PO BOX 145, GRANT, CO 80448-0145
PO BOX 146, GRANT, CO 80448-0146
PO BOX 147, GRANT, CO 80448-0147
PO BOX 148, GRANT, CO 80448-0148
PO BOX 149, GRANT, CO 80448-0149
PO BOX 150, GRANT, CO 80448-0150
PO BOX 151, GRANT, CO 80448-0151
PO BOX 152, GRANT, CO 80448-0152
PO BOX 153, GRANT, CO 80448-0153
PO BOX 154, GRANT, CO 80448-0154
PO BOX 155, GRANT, CO 80448-0155
PO BOX 156, GRANT, CO 80448-0156
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