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, FORT DEFIANCE, VA 24437-0001
PO BOX 2, FORT DEFIANCE, VA 24437-0002
PO BOX 3, FORT DEFIANCE, VA 24437-0003
PO BOX 4, FORT DEFIANCE, VA 24437-0004
PO BOX 5, FORT DEFIANCE, VA 24437-0005
PO BOX 6, FORT DEFIANCE, VA 24437-0006
PO BOX 7, FORT DEFIANCE, VA 24437-0007
PO BOX 8, FORT DEFIANCE, VA 24437-0008
PO BOX 9, FORT DEFIANCE, VA 24437-0009
PO BOX 10, FORT DEFIANCE, VA 24437-0010
PO BOX 11, FORT DEFIANCE, VA 24437-0011
PO BOX 12, FORT DEFIANCE, VA 24437-0012
PO BOX 13, FORT DEFIANCE, VA 24437-0013
PO BOX 14, FORT DEFIANCE, VA 24437-0014
PO BOX 15, FORT DEFIANCE, VA 24437-0015
PO BOX 16, FORT DEFIANCE, VA 24437-0016
PO BOX 17, FORT DEFIANCE, VA 24437-0017
PO BOX 18, FORT DEFIANCE, VA 24437-0018
PO BOX 19, FORT DEFIANCE, VA 24437-0019
PO BOX 20, FORT DEFIANCE, VA 24437-0020
PO BOX 21, FORT DEFIANCE, VA 24437-0021
PO BOX 22, FORT DEFIANCE, VA 24437-0022
PO BOX 23, FORT DEFIANCE, VA 24437-0023
PO BOX 24, FORT DEFIANCE, VA 24437-0024
PO BOX 25, FORT DEFIANCE, VA 24437-0025
PO BOX 26, FORT DEFIANCE, VA 24437-0026
PO BOX 27, FORT DEFIANCE, VA 24437-0027
PO BOX 28, FORT DEFIANCE, VA 24437-0028
PO BOX 29, FORT DEFIANCE, VA 24437-0029
PO BOX 30, FORT DEFIANCE, VA 24437-0030
PO BOX 31, FORT DEFIANCE, VA 24437-0031
PO BOX 32, FORT DEFIANCE, VA 24437-0032
PO BOX 33, FORT DEFIANCE, VA 24437-0033
PO BOX 34, FORT DEFIANCE, VA 24437-0034
PO BOX 35, FORT DEFIANCE, VA 24437-0035
PO BOX 36, FORT DEFIANCE, VA 24437-0036
PO BOX 37, FORT DEFIANCE, VA 24437-0037
PO BOX 38, FORT DEFIANCE, VA 24437-0038
PO BOX 39, FORT DEFIANCE, VA 24437-0039
PO BOX 40, FORT DEFIANCE, VA 24437-0040
PO BOX 41, FORT DEFIANCE, VA 24437-0041
PO BOX 42, FORT DEFIANCE, VA 24437-0042
PO BOX 43, FORT DEFIANCE, VA 24437-0043
PO BOX 44, FORT DEFIANCE, VA 24437-0044
PO BOX 45, FORT DEFIANCE, VA 24437-0045
PO BOX 46, FORT DEFIANCE, VA 24437-0046
PO BOX 47, FORT DEFIANCE, VA 24437-0047
PO BOX 48, FORT DEFIANCE, VA 24437-0048
PO BOX 49, FORT DEFIANCE, VA 24437-0049
PO BOX 50, FORT DEFIANCE, VA 24437-0050
PO BOX 51, FORT DEFIANCE, VA 24437-0051
PO BOX 52, FORT DEFIANCE, VA 24437-0052
PO BOX 53, FORT DEFIANCE, VA 24437-0053
PO BOX 54, FORT DEFIANCE, VA 24437-0054
PO BOX 55, FORT DEFIANCE, VA 24437-0055
PO BOX 56, FORT DEFIANCE, VA 24437-0056
PO BOX 57, FORT DEFIANCE, VA 24437-0057
PO BOX 58, FORT DEFIANCE, VA 24437-0058
PO BOX 59, FORT DEFIANCE, VA 24437-0059
PO BOX 60, FORT DEFIANCE, VA 24437-0060
PO BOX 61, FORT DEFIANCE, VA 24437-0061
PO BOX 62, FORT DEFIANCE, VA 24437-0062
PO BOX 63, FORT DEFIANCE, VA 24437-0063
PO BOX 64, FORT DEFIANCE, VA 24437-0064
PO BOX 65, FORT DEFIANCE, VA 24437-0065
PO BOX 66, FORT DEFIANCE, VA 24437-0066
PO BOX 67, FORT DEFIANCE, VA 24437-0067
PO BOX 68, FORT DEFIANCE, VA 24437-0068
PO BOX 69, FORT DEFIANCE, VA 24437-0069
PO BOX 70, FORT DEFIANCE, VA 24437-0070
PO BOX 71, FORT DEFIANCE, VA 24437-0071
PO BOX 72, FORT DEFIANCE, VA 24437-0072
PO BOX 73, FORT DEFIANCE, VA 24437-0073
PO BOX 74, FORT DEFIANCE, VA 24437-0074
PO BOX 75, FORT DEFIANCE, VA 24437-0075
PO BOX 76, FORT DEFIANCE, VA 24437-0076
PO BOX 77, FORT DEFIANCE, VA 24437-0077
PO BOX 78, FORT DEFIANCE, VA 24437-0078
PO BOX 79, FORT DEFIANCE, VA 24437-0079
PO BOX 80, FORT DEFIANCE, VA 24437-0080
PO BOX 81, FORT DEFIANCE, VA 24437-0081
PO BOX 82, FORT DEFIANCE, VA 24437-0082
PO BOX 83, FORT DEFIANCE, VA 24437-0083
PO BOX 84, FORT DEFIANCE, VA 24437-0084
PO BOX 85, FORT DEFIANCE, VA 24437-0085
PO BOX 86, FORT DEFIANCE, VA 24437-0086
PO BOX 87, FORT DEFIANCE, VA 24437-0087
PO BOX 88, FORT DEFIANCE, VA 24437-0088
PO BOX 89, FORT DEFIANCE, VA 24437-0089
PO BOX 90, FORT DEFIANCE, VA 24437-0090
PO BOX 91, FORT DEFIANCE, VA 24437-0091
PO BOX 92, FORT DEFIANCE, VA 24437-0092
PO BOX 93, FORT DEFIANCE, VA 24437-0093
PO BOX 94, FORT DEFIANCE, VA 24437-0094
PO BOX 95, FORT DEFIANCE, VA 24437-0095
PO BOX 96, FORT DEFIANCE, VA 24437-0096
PO BOX 97, FORT DEFIANCE, VA 24437-0097
PO BOX 98, FORT DEFIANCE, VA 24437-0098
PO BOX 99, FORT DEFIANCE, VA 24437-0099
PO BOX 100, FORT DEFIANCE, VA 24437-0100
PO BOX 101, FORT DEFIANCE, VA 24437-0101
PO BOX 102, FORT DEFIANCE, VA 24437-0102
PO BOX 103, FORT DEFIANCE, VA 24437-0103
PO BOX 104, FORT DEFIANCE, VA 24437-0104
PO BOX 105, FORT DEFIANCE, VA 24437-0105
PO BOX 106, FORT DEFIANCE, VA 24437-0106
PO BOX 107, FORT DEFIANCE, VA 24437-0107
PO BOX 108, FORT DEFIANCE, VA 24437-0108
PO BOX 109, FORT DEFIANCE, VA 24437-0109
PO BOX 110, FORT DEFIANCE, VA 24437-0110
PO BOX 111, FORT DEFIANCE, VA 24437-0111
PO BOX 112, FORT DEFIANCE, VA 24437-0112
PO BOX 113, FORT DEFIANCE, VA 24437-0113
PO BOX 114, FORT DEFIANCE, VA 24437-0114
PO BOX 115, FORT DEFIANCE, VA 24437-0115
PO BOX 116, FORT DEFIANCE, VA 24437-0116
PO BOX 117, FORT DEFIANCE, VA 24437-0117
PO BOX 118, FORT DEFIANCE, VA 24437-0118
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