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, CHRISTIANSBURG, VA 24068-0001
PO BOX 2, CHRISTIANSBURG, VA 24068-0002
PO BOX 3, CHRISTIANSBURG, VA 24068-0003
PO BOX 4, CHRISTIANSBURG, VA 24068-0004
PO BOX 5, CHRISTIANSBURG, VA 24068-0005
PO BOX 6, CHRISTIANSBURG, VA 24068-0006
PO BOX 7, CHRISTIANSBURG, VA 24068-0007
PO BOX 8, CHRISTIANSBURG, VA 24068-0008
PO BOX 9, CHRISTIANSBURG, VA 24068-0009
PO BOX 10, CHRISTIANSBURG, VA 24068-0010
PO BOX 11, CHRISTIANSBURG, VA 24068-0011
PO BOX 12, CHRISTIANSBURG, VA 24068-0012
PO BOX 13, CHRISTIANSBURG, VA 24068-0013
PO BOX 14, CHRISTIANSBURG, VA 24068-0014
PO BOX 15, CHRISTIANSBURG, VA 24068-0015
PO BOX 16, CHRISTIANSBURG, VA 24068-0016
PO BOX 17, CHRISTIANSBURG, VA 24068-0017
PO BOX 18, CHRISTIANSBURG, VA 24068-0018
PO BOX 19, CHRISTIANSBURG, VA 24068-0019
PO BOX 20, CHRISTIANSBURG, VA 24068-0020
PO BOX 21, CHRISTIANSBURG, VA 24068-0021
PO BOX 22, CHRISTIANSBURG, VA 24068-0022
PO BOX 23, CHRISTIANSBURG, VA 24068-0023
PO BOX 24, CHRISTIANSBURG, VA 24068-0024
PO BOX 25, CHRISTIANSBURG, VA 24068-0025
PO BOX 26, CHRISTIANSBURG, VA 24068-0026
PO BOX 27, CHRISTIANSBURG, VA 24068-0027
PO BOX 28, CHRISTIANSBURG, VA 24068-0028
PO BOX 29, CHRISTIANSBURG, VA 24068-0029
PO BOX 30, CHRISTIANSBURG, VA 24068-0030
PO BOX 31, CHRISTIANSBURG, VA 24068-0031
PO BOX 32, CHRISTIANSBURG, VA 24068-0032
PO BOX 33, CHRISTIANSBURG, VA 24068-0033
PO BOX 34, CHRISTIANSBURG, VA 24068-0034
PO BOX 35, CHRISTIANSBURG, VA 24068-0035
PO BOX 36, CHRISTIANSBURG, VA 24068-0036
PO BOX 37, CHRISTIANSBURG, VA 24068-0037
PO BOX 38, CHRISTIANSBURG, VA 24068-0038
PO BOX 39, CHRISTIANSBURG, VA 24068-0039
PO BOX 40, CHRISTIANSBURG, VA 24068-0040
PO BOX 41, CHRISTIANSBURG, VA 24068-0041
PO BOX 42, CHRISTIANSBURG, VA 24068-0042
PO BOX 43, CHRISTIANSBURG, VA 24068-0043
PO BOX 44, CHRISTIANSBURG, VA 24068-0044
PO BOX 45, CHRISTIANSBURG, VA 24068-0045
PO BOX 46, CHRISTIANSBURG, VA 24068-0046
PO BOX 47, CHRISTIANSBURG, VA 24068-0047
PO BOX 48, CHRISTIANSBURG, VA 24068-0048
PO BOX 49, CHRISTIANSBURG, VA 24068-0049
PO BOX 50, CHRISTIANSBURG, VA 24068-0050
PO BOX 51, CHRISTIANSBURG, VA 24068-0051
PO BOX 52, CHRISTIANSBURG, VA 24068-0052
PO BOX 53, CHRISTIANSBURG, VA 24068-0053
PO BOX 54, CHRISTIANSBURG, VA 24068-0054
PO BOX 55, CHRISTIANSBURG, VA 24068-0055
PO BOX 56, CHRISTIANSBURG, VA 24068-0056
PO BOX 57, CHRISTIANSBURG, VA 24068-0057
PO BOX 58, CHRISTIANSBURG, VA 24068-0058
PO BOX 59, CHRISTIANSBURG, VA 24068-0059
PO BOX 60, CHRISTIANSBURG, VA 24068-0060
PO BOX 61, CHRISTIANSBURG, VA 24068-0061
PO BOX 62, CHRISTIANSBURG, VA 24068-0062
PO BOX 63, CHRISTIANSBURG, VA 24068-0063
PO BOX 64, CHRISTIANSBURG, VA 24068-0064
PO BOX 65, CHRISTIANSBURG, VA 24068-0065
PO BOX 66, CHRISTIANSBURG, VA 24068-0066
PO BOX 67, CHRISTIANSBURG, VA 24068-0067
PO BOX 68, CHRISTIANSBURG, VA 24068-0068
PO BOX 69, CHRISTIANSBURG, VA 24068-0069
PO BOX 70, CHRISTIANSBURG, VA 24068-0070
PO BOX 71, CHRISTIANSBURG, VA 24068-0071
PO BOX 72, CHRISTIANSBURG, VA 24068-0072
PO BOX 73, CHRISTIANSBURG, VA 24068-0073
PO BOX 74, CHRISTIANSBURG, VA 24068-0074
PO BOX 75, CHRISTIANSBURG, VA 24068-0075
PO BOX 76, CHRISTIANSBURG, VA 24068-0076
PO BOX 77, CHRISTIANSBURG, VA 24068-0077
PO BOX 78, CHRISTIANSBURG, VA 24068-0078
PO BOX 79, CHRISTIANSBURG, VA 24068-0079
PO BOX 80, CHRISTIANSBURG, VA 24068-0080
PO BOX 81, CHRISTIANSBURG, VA 24068-0081
PO BOX 82, CHRISTIANSBURG, VA 24068-0082
PO BOX 83, CHRISTIANSBURG, VA 24068-0083
PO BOX 84, CHRISTIANSBURG, VA 24068-0084
PO BOX 85, CHRISTIANSBURG, VA 24068-0085
PO BOX 86, CHRISTIANSBURG, VA 24068-0086
PO BOX 87, CHRISTIANSBURG, VA 24068-0087
PO BOX 88, CHRISTIANSBURG, VA 24068-0088
PO BOX 89, CHRISTIANSBURG, VA 24068-0089
PO BOX 90, CHRISTIANSBURG, VA 24068-0090
PO BOX 91, CHRISTIANSBURG, VA 24068-0091
PO BOX 92, CHRISTIANSBURG, VA 24068-0092
PO BOX 93, CHRISTIANSBURG, VA 24068-0093
PO BOX 94, CHRISTIANSBURG, VA 24068-0094
PO BOX 95, CHRISTIANSBURG, VA 24068-0095
PO BOX 96, CHRISTIANSBURG, VA 24068-0096
PO BOX 97, CHRISTIANSBURG, VA 24068-0097
PO BOX 98, CHRISTIANSBURG, VA 24068-0098
PO BOX 99, CHRISTIANSBURG, VA 24068-0099
PO BOX 100, CHRISTIANSBURG, VA 24068-0100
PO BOX 101, CHRISTIANSBURG, VA 24068-0101
PO BOX 102, CHRISTIANSBURG, VA 24068-0102
PO BOX 103, CHRISTIANSBURG, VA 24068-0103
PO BOX 104, CHRISTIANSBURG, VA 24068-0104
PO BOX 105, CHRISTIANSBURG, VA 24068-0105
PO BOX 106, CHRISTIANSBURG, VA 24068-0106
PO BOX 107, CHRISTIANSBURG, VA 24068-0107
PO BOX 108, CHRISTIANSBURG, VA 24068-0108
PO BOX 109, CHRISTIANSBURG, VA 24068-0109
PO BOX 110, CHRISTIANSBURG, VA 24068-0110
PO BOX 111, CHRISTIANSBURG, VA 24068-0111
PO BOX 112, CHRISTIANSBURG, VA 24068-0112
PO BOX 113, CHRISTIANSBURG, VA 24068-0113
PO BOX 114, CHRISTIANSBURG, VA 24068-0114
PO BOX 115, CHRISTIANSBURG, VA 24068-0115
PO BOX 116, CHRISTIANSBURG, VA 24068-0116
PO BOX 117, CHRISTIANSBURG, VA 24068-0117
PO BOX 118, CHRISTIANSBURG, VA 24068-0118
PO BOX 119, CHRISTIANSBURG, VA 24068-0119
PO BOX 120, CHRISTIANSBURG, VA 24068-0120
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