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, STANARDSVILLE, VA 22973-0001
PO BOX 2, STANARDSVILLE, VA 22973-0002
PO BOX 3, STANARDSVILLE, VA 22973-0003
PO BOX 4, STANARDSVILLE, VA 22973-0004
PO BOX 5, STANARDSVILLE, VA 22973-0005
PO BOX 6, STANARDSVILLE, VA 22973-0006
PO BOX 7, STANARDSVILLE, VA 22973-0007
PO BOX 8, STANARDSVILLE, VA 22973-0008
PO BOX 9, STANARDSVILLE, VA 22973-0009
PO BOX 10, STANARDSVILLE, VA 22973-0010
PO BOX 11, STANARDSVILLE, VA 22973-0011
PO BOX 12, STANARDSVILLE, VA 22973-0012
PO BOX 13, STANARDSVILLE, VA 22973-0013
PO BOX 14, STANARDSVILLE, VA 22973-0014
PO BOX 15, STANARDSVILLE, VA 22973-0015
PO BOX 16, STANARDSVILLE, VA 22973-0016
PO BOX 17, STANARDSVILLE, VA 22973-0017
PO BOX 18, STANARDSVILLE, VA 22973-0018
PO BOX 19, STANARDSVILLE, VA 22973-0019
PO BOX 20, STANARDSVILLE, VA 22973-0020
PO BOX 21, STANARDSVILLE, VA 22973-0021
PO BOX 22, STANARDSVILLE, VA 22973-0022
PO BOX 23, STANARDSVILLE, VA 22973-0023
PO BOX 24, STANARDSVILLE, VA 22973-0024
PO BOX 25, STANARDSVILLE, VA 22973-0025
PO BOX 26, STANARDSVILLE, VA 22973-0026
PO BOX 27, STANARDSVILLE, VA 22973-0027
PO BOX 28, STANARDSVILLE, VA 22973-0028
PO BOX 29, STANARDSVILLE, VA 22973-0029
PO BOX 30, STANARDSVILLE, VA 22973-0030
PO BOX 31, STANARDSVILLE, VA 22973-0031
PO BOX 32, STANARDSVILLE, VA 22973-0032
PO BOX 33, STANARDSVILLE, VA 22973-0033
PO BOX 34, STANARDSVILLE, VA 22973-0034
PO BOX 35, STANARDSVILLE, VA 22973-0035
PO BOX 36, STANARDSVILLE, VA 22973-0036
PO BOX 37, STANARDSVILLE, VA 22973-0037
PO BOX 38, STANARDSVILLE, VA 22973-0038
PO BOX 39, STANARDSVILLE, VA 22973-0039
PO BOX 40, STANARDSVILLE, VA 22973-0040
PO BOX 41, STANARDSVILLE, VA 22973-0041
PO BOX 42, STANARDSVILLE, VA 22973-0042
PO BOX 43, STANARDSVILLE, VA 22973-0043
PO BOX 44, STANARDSVILLE, VA 22973-0044
PO BOX 45, STANARDSVILLE, VA 22973-0045
PO BOX 46, STANARDSVILLE, VA 22973-0046
PO BOX 47, STANARDSVILLE, VA 22973-0047
PO BOX 48, STANARDSVILLE, VA 22973-0048
PO BOX 49, STANARDSVILLE, VA 22973-0049
PO BOX 50, STANARDSVILLE, VA 22973-0050
PO BOX 51, STANARDSVILLE, VA 22973-0051
PO BOX 52, STANARDSVILLE, VA 22973-0052
PO BOX 53, STANARDSVILLE, VA 22973-0053
PO BOX 54, STANARDSVILLE, VA 22973-0054
PO BOX 55, STANARDSVILLE, VA 22973-0055
PO BOX 56, STANARDSVILLE, VA 22973-0056
PO BOX 57, STANARDSVILLE, VA 22973-0057
PO BOX 58, STANARDSVILLE, VA 22973-0058
PO BOX 59, STANARDSVILLE, VA 22973-0059
PO BOX 60, STANARDSVILLE, VA 22973-0060
PO BOX 61, STANARDSVILLE, VA 22973-0061
PO BOX 62, STANARDSVILLE, VA 22973-0062
PO BOX 63, STANARDSVILLE, VA 22973-0063
PO BOX 64, STANARDSVILLE, VA 22973-0064
PO BOX 65, STANARDSVILLE, VA 22973-0065
PO BOX 66, STANARDSVILLE, VA 22973-0066
PO BOX 67, STANARDSVILLE, VA 22973-0067
PO BOX 68, STANARDSVILLE, VA 22973-0068
PO BOX 69, STANARDSVILLE, VA 22973-0069
PO BOX 70, STANARDSVILLE, VA 22973-0070
PO BOX 71, STANARDSVILLE, VA 22973-0071
PO BOX 72, STANARDSVILLE, VA 22973-0072
PO BOX 73, STANARDSVILLE, VA 22973-0073
PO BOX 74, STANARDSVILLE, VA 22973-0074
PO BOX 75, STANARDSVILLE, VA 22973-0075
PO BOX 76, STANARDSVILLE, VA 22973-0076
PO BOX 77, STANARDSVILLE, VA 22973-0077
PO BOX 78, STANARDSVILLE, VA 22973-0078
PO BOX 79, STANARDSVILLE, VA 22973-0079
PO BOX 80, STANARDSVILLE, VA 22973-0080
PO BOX 81, STANARDSVILLE, VA 22973-0081
PO BOX 82, STANARDSVILLE, VA 22973-0082
PO BOX 83, STANARDSVILLE, VA 22973-0083
PO BOX 84, STANARDSVILLE, VA 22973-0084
PO BOX 85, STANARDSVILLE, VA 22973-0085
PO BOX 86, STANARDSVILLE, VA 22973-0086
PO BOX 87, STANARDSVILLE, VA 22973-0087
PO BOX 88, STANARDSVILLE, VA 22973-0088
PO BOX 89, STANARDSVILLE, VA 22973-0089
PO BOX 90, STANARDSVILLE, VA 22973-0090
PO BOX 91, STANARDSVILLE, VA 22973-0091
PO BOX 92, STANARDSVILLE, VA 22973-0092
PO BOX 93, STANARDSVILLE, VA 22973-0093
PO BOX 94, STANARDSVILLE, VA 22973-0094
PO BOX 95, STANARDSVILLE, VA 22973-0095
PO BOX 96, STANARDSVILLE, VA 22973-0096
PO BOX 97, STANARDSVILLE, VA 22973-0097
PO BOX 98, STANARDSVILLE, VA 22973-0098
PO BOX 99, STANARDSVILLE, VA 22973-0099
PO BOX 100, STANARDSVILLE, VA 22973-0100
PO BOX 101, STANARDSVILLE, VA 22973-0101
PO BOX 102, STANARDSVILLE, VA 22973-0102
PO BOX 103, STANARDSVILLE, VA 22973-0103
PO BOX 104, STANARDSVILLE, VA 22973-0104
PO BOX 105, STANARDSVILLE, VA 22973-0105
PO BOX 106, STANARDSVILLE, VA 22973-0106
PO BOX 107, STANARDSVILLE, VA 22973-0107
PO BOX 108, STANARDSVILLE, VA 22973-0108
PO BOX 109, STANARDSVILLE, VA 22973-0109
PO BOX 110, STANARDSVILLE, VA 22973-0110
PO BOX 111, STANARDSVILLE, VA 22973-0111
PO BOX 112, STANARDSVILLE, VA 22973-0112
PO BOX 113, STANARDSVILLE, VA 22973-0113
PO BOX 114, STANARDSVILLE, VA 22973-0114
PO BOX 115, STANARDSVILLE, VA 22973-0115
PO BOX 116, STANARDSVILLE, VA 22973-0116
PO BOX 117, STANARDSVILLE, VA 22973-0117
PO BOX 118, STANARDSVILLE, VA 22973-0118
PO BOX 119, STANARDSVILLE, VA 22973-0119
PO BOX 120, STANARDSVILLE, VA 22973-0120
PO BOX 121, STANARDSVILLE, VA 22973-0121
PO BOX 122, STANARDSVILLE, VA 22973-0122
PO BOX 123, STANARDSVILLE, VA 22973-0123
PO BOX 124, STANARDSVILLE, VA 22973-0124
PO BOX 125, STANARDSVILLE, VA 22973-0125
PO BOX 126, STANARDSVILLE, VA 22973-0126
PO BOX 127, STANARDSVILLE, VA 22973-0127
PO BOX 128, STANARDSVILLE, VA 22973-0128
PO BOX 129, STANARDSVILLE, VA 22973-0129
PO BOX 130, STANARDSVILLE, VA 22973-0130
PO BOX 131, STANARDSVILLE, VA 22973-0131
PO BOX 132, STANARDSVILLE, VA 22973-0132
PO BOX 133, STANARDSVILLE, VA 22973-0133
PO BOX 134, STANARDSVILLE, VA 22973-0134
PO BOX 135, STANARDSVILLE, VA 22973-0135
PO BOX 136, STANARDSVILLE, VA 22973-0136
PO BOX 137, STANARDSVILLE, VA 22973-0137
PO BOX 138, STANARDSVILLE, VA 22973-0138
PO BOX 139, STANARDSVILLE, VA 22973-0139
PO BOX 140, STANARDSVILLE, VA 22973-0140
PO BOX 141, STANARDSVILLE, VA 22973-0141
PO BOX 142, STANARDSVILLE, VA 22973-0142
PO BOX 143, STANARDSVILLE, VA 22973-0143
PO BOX 144, STANARDSVILLE, VA 22973-0144
PO BOX 145, STANARDSVILLE, VA 22973-0145
PO BOX 146, STANARDSVILLE, VA 22973-0146
PO BOX 147, STANARDSVILLE, VA 22973-0147
PO BOX 148, STANARDSVILLE, VA 22973-0148
PO BOX 149, STANARDSVILLE, VA 22973-0149
PO BOX 150, STANARDSVILLE, VA 22973-0150
PO BOX 151, STANARDSVILLE, VA 22973-0151
PO BOX 152, STANARDSVILLE, VA 22973-0152
PO BOX 153, STANARDSVILLE, VA 22973-0153
PO BOX 154, STANARDSVILLE, VA 22973-0154
PO BOX 155, STANARDSVILLE, VA 22973-0155
PO BOX 156, STANARDSVILLE, VA 22973-0156
PO BOX 157, STANARDSVILLE, VA 22973-0157
PO BOX 158, STANARDSVILLE, VA 22973-0158
PO BOX 159, STANARDSVILLE, VA 22973-0159
PO BOX 160, STANARDSVILLE, VA 22973-0160
PO BOX 161, STANARDSVILLE, VA 22973-0161
PO BOX 162, STANARDSVILLE, VA 22973-0162
PO BOX 163, STANARDSVILLE, VA 22973-0163
PO BOX 164, STANARDSVILLE, VA 22973-0164
PO BOX 165, STANARDSVILLE, VA 22973-0165
PO BOX 166, STANARDSVILLE, VA 22973-0166
PO BOX 167, STANARDSVILLE, VA 22973-0167
PO BOX 168, STANARDSVILLE, VA 22973-0168
PO BOX 169, STANARDSVILLE, VA 22973-0169
PO BOX 170, STANARDSVILLE, VA 22973-0170
PO BOX 171, STANARDSVILLE, VA 22973-0171
PO BOX 172, STANARDSVILLE, VA 22973-0172
PO BOX 173, STANARDSVILLE, VA 22973-0173
PO BOX 174, STANARDSVILLE, VA 22973-0174
PO BOX 175, STANARDSVILLE, VA 22973-0175
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