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 21, WHITE RIVER JUNCTION, VT 05001-0021
PO BOX 22, WHITE RIVER JUNCTION, VT 05001-0022
PO BOX 23, WHITE RIVER JUNCTION, VT 05001-0023
PO BOX 24, WHITE RIVER JUNCTION, VT 05001-0024
PO BOX 25, WHITE RIVER JUNCTION, VT 05001-0025
PO BOX 26, WHITE RIVER JUNCTION, VT 05001-0026
PO BOX 27, WHITE RIVER JUNCTION, VT 05001-0027
PO BOX 28, WHITE RIVER JUNCTION, VT 05001-0028
PO BOX 29, WHITE RIVER JUNCTION, VT 05001-0029
PO BOX 30, WHITE RIVER JUNCTION, VT 05001-0030
PO BOX 31, WHITE RIVER JUNCTION, VT 05001-0031
PO BOX 32, WHITE RIVER JUNCTION, VT 05001-0032
PO BOX 33, WHITE RIVER JUNCTION, VT 05001-0033
PO BOX 34, WHITE RIVER JUNCTION, VT 05001-0034
PO BOX 35, WHITE RIVER JUNCTION, VT 05001-0035
PO BOX 36, WHITE RIVER JUNCTION, VT 05001-0036
PO BOX 37, WHITE RIVER JUNCTION, VT 05001-0037
PO BOX 38, WHITE RIVER JUNCTION, VT 05001-0038
PO BOX 39, WHITE RIVER JUNCTION, VT 05001-0039
PO BOX 40, WHITE RIVER JUNCTION, VT 05001-0040
PO BOX 41, WHITE RIVER JUNCTION, VT 05001-0041
PO BOX 42, WHITE RIVER JUNCTION, VT 05001-0042
PO BOX 43, WHITE RIVER JUNCTION, VT 05001-0043
PO BOX 44, WHITE RIVER JUNCTION, VT 05001-0044
PO BOX 45, WHITE RIVER JUNCTION, VT 05001-0045
PO BOX 46, WHITE RIVER JUNCTION, VT 05001-0046
PO BOX 47, WHITE RIVER JUNCTION, VT 05001-0047
PO BOX 48, WHITE RIVER JUNCTION, VT 05001-0048
PO BOX 49, WHITE RIVER JUNCTION, VT 05001-0049
PO BOX 50, WHITE RIVER JUNCTION, VT 05001-0050
PO BOX 51, WHITE RIVER JUNCTION, VT 05001-0051
PO BOX 52, WHITE RIVER JUNCTION, VT 05001-0052
PO BOX 53, WHITE RIVER JUNCTION, VT 05001-0053
PO BOX 54, WHITE RIVER JUNCTION, VT 05001-0054
PO BOX 55, WHITE RIVER JUNCTION, VT 05001-0055
PO BOX 56, WHITE RIVER JUNCTION, VT 05001-0056
PO BOX 57, WHITE RIVER JUNCTION, VT 05001-0057
PO BOX 58, WHITE RIVER JUNCTION, VT 05001-0058
PO BOX 59, WHITE RIVER JUNCTION, VT 05001-0059
PO BOX 60, WHITE RIVER JUNCTION, VT 05001-0060
PO BOX 61, WHITE RIVER JUNCTION, VT 05001-0061
PO BOX 62, WHITE RIVER JUNCTION, VT 05001-0062
PO BOX 63, WHITE RIVER JUNCTION, VT 05001-0063
PO BOX 64, WHITE RIVER JUNCTION, VT 05001-0064
PO BOX 65, WHITE RIVER JUNCTION, VT 05001-0065
PO BOX 66, WHITE RIVER JUNCTION, VT 05001-0066
PO BOX 67, WHITE RIVER JUNCTION, VT 05001-0067
PO BOX 68, WHITE RIVER JUNCTION, VT 05001-0068
PO BOX 69, WHITE RIVER JUNCTION, VT 05001-0069
PO BOX 70, WHITE RIVER JUNCTION, VT 05001-0070
PO BOX 71, WHITE RIVER JUNCTION, VT 05001-0071
PO BOX 72, WHITE RIVER JUNCTION, VT 05001-0072
PO BOX 73, WHITE RIVER JUNCTION, VT 05001-0073
PO BOX 74, WHITE RIVER JUNCTION, VT 05001-0074
PO BOX 75, WHITE RIVER JUNCTION, VT 05001-0075
PO BOX 76, WHITE RIVER JUNCTION, VT 05001-0076
PO BOX 77, WHITE RIVER JUNCTION, VT 05001-0077
PO BOX 78, WHITE RIVER JUNCTION, VT 05001-0078
PO BOX 79, WHITE RIVER JUNCTION, VT 05001-0079
PO BOX 80, WHITE RIVER JUNCTION, VT 05001-0080
PO BOX 81, WHITE RIVER JUNCTION, VT 05001-0081
PO BOX 82, WHITE RIVER JUNCTION, VT 05001-0082
PO BOX 83, WHITE RIVER JUNCTION, VT 05001-0083
PO BOX 84, WHITE RIVER JUNCTION, VT 05001-0084
PO BOX 85, WHITE RIVER JUNCTION, VT 05001-0085
PO BOX 86, WHITE RIVER JUNCTION, VT 05001-0086
PO BOX 87, WHITE RIVER JUNCTION, VT 05001-0087
PO BOX 88, WHITE RIVER JUNCTION, VT 05001-0088
PO BOX 89, WHITE RIVER JUNCTION, VT 05001-0089
PO BOX 90, WHITE RIVER JUNCTION, VT 05001-0090
PO BOX 91, WHITE RIVER JUNCTION, VT 05001-0091
PO BOX 92, WHITE RIVER JUNCTION, VT 05001-0092
PO BOX 93, WHITE RIVER JUNCTION, VT 05001-0093
PO BOX 94, WHITE RIVER JUNCTION, VT 05001-0094
PO BOX 95, WHITE RIVER JUNCTION, VT 05001-0095
PO BOX 96, WHITE RIVER JUNCTION, VT 05001-0096
PO BOX 97, WHITE RIVER JUNCTION, VT 05001-0097
PO BOX 98, WHITE RIVER JUNCTION, VT 05001-0098
PO BOX 99, WHITE RIVER JUNCTION, VT 05001-0099
PO BOX 100, WHITE RIVER JUNCTION, VT 05001-0100
PO BOX 101, WHITE RIVER JUNCTION, VT 05001-0101
PO BOX 102, WHITE RIVER JUNCTION, VT 05001-0102
PO BOX 103, WHITE RIVER JUNCTION, VT 05001-0103
PO BOX 104, WHITE RIVER JUNCTION, VT 05001-0104
PO BOX 105, WHITE RIVER JUNCTION, VT 05001-0105
PO BOX 106, WHITE RIVER JUNCTION, VT 05001-0106
PO BOX 107, WHITE RIVER JUNCTION, VT 05001-0107
PO BOX 108, WHITE RIVER JUNCTION, VT 05001-0108
PO BOX 109, WHITE RIVER JUNCTION, VT 05001-0109
PO BOX 110, WHITE RIVER JUNCTION, VT 05001-0110
PO BOX 111, WHITE RIVER JUNCTION, VT 05001-0111
PO BOX 112, WHITE RIVER JUNCTION, VT 05001-0112
PO BOX 113, WHITE RIVER JUNCTION, VT 05001-0113
PO BOX 114, WHITE RIVER JUNCTION, VT 05001-0114
PO BOX 115, WHITE RIVER JUNCTION, VT 05001-0115
PO BOX 116, WHITE RIVER JUNCTION, VT 05001-0116
PO BOX 117, WHITE RIVER JUNCTION, VT 05001-0117
PO BOX 118, WHITE RIVER JUNCTION, VT 05001-0118
PO BOX 119, WHITE RIVER JUNCTION, VT 05001-0119
PO BOX 120, WHITE RIVER JUNCTION, VT 05001-0120
PO BOX 121, WHITE RIVER JUNCTION, VT 05001-0121
PO BOX 122, WHITE RIVER JUNCTION, VT 05001-0122
PO BOX 123, WHITE RIVER JUNCTION, VT 05001-0123
PO BOX 124, WHITE RIVER JUNCTION, VT 05001-0124
PO BOX 125, WHITE RIVER JUNCTION, VT 05001-0125
PO BOX 126, WHITE RIVER JUNCTION, VT 05001-0126
PO BOX 127, WHITE RIVER JUNCTION, VT 05001-0127
PO BOX 128, WHITE RIVER JUNCTION, VT 05001-0128
PO BOX 129, WHITE RIVER JUNCTION, VT 05001-0129
PO BOX 130, WHITE RIVER JUNCTION, VT 05001-0130
PO BOX 131, WHITE RIVER JUNCTION, VT 05001-0131
PO BOX 132, WHITE RIVER JUNCTION, VT 05001-0132
PO BOX 133, WHITE RIVER JUNCTION, VT 05001-0133
PO BOX 134, WHITE RIVER JUNCTION, VT 05001-0134
PO BOX 135, WHITE RIVER JUNCTION, VT 05001-0135
PO BOX 136, WHITE RIVER JUNCTION, VT 05001-0136
PO BOX 137, WHITE RIVER JUNCTION, VT 05001-0137
PO BOX 138, WHITE RIVER JUNCTION, VT 05001-0138
PO BOX 139, WHITE RIVER JUNCTION, VT 05001-0139
PO BOX 140, WHITE RIVER JUNCTION, VT 05001-0140
PO BOX 141, WHITE RIVER JUNCTION, VT 05001-0141
PO BOX 142, WHITE RIVER JUNCTION, VT 05001-0142
PO BOX 143, WHITE RIVER JUNCTION, VT 05001-0143
PO BOX 144, WHITE RIVER JUNCTION, VT 05001-0144
PO BOX 145, WHITE RIVER JUNCTION, VT 05001-0145
PO BOX 146, WHITE RIVER JUNCTION, VT 05001-0146
PO BOX 147, WHITE RIVER JUNCTION, VT 05001-0147
PO BOX 148, WHITE RIVER JUNCTION, VT 05001-0148
PO BOX 149, WHITE RIVER JUNCTION, VT 05001-0149
PO BOX 150, WHITE RIVER JUNCTION, VT 05001-0150
PO BOX 151, WHITE RIVER JUNCTION, VT 05001-0151
PO BOX 152, WHITE RIVER JUNCTION, VT 05001-0152
PO BOX 153, WHITE RIVER JUNCTION, VT 05001-0153
PO BOX 154, WHITE RIVER JUNCTION, VT 05001-0154
PO BOX 155, WHITE RIVER JUNCTION, VT 05001-0155
PO BOX 156, WHITE RIVER JUNCTION, VT 05001-0156
PO BOX 157, WHITE RIVER JUNCTION, VT 05001-0157
PO BOX 158, WHITE RIVER JUNCTION, VT 05001-0158
PO BOX 159, WHITE RIVER JUNCTION, VT 05001-0159
PO BOX 160, WHITE RIVER JUNCTION, VT 05001-0160
PO BOX 161, WHITE RIVER JUNCTION, VT 05001-0161
PO BOX 162, WHITE RIVER JUNCTION, VT 05001-0162
PO BOX 163, WHITE RIVER JUNCTION, VT 05001-0163
PO BOX 164, WHITE RIVER JUNCTION, VT 05001-0164
PO BOX 165, WHITE RIVER JUNCTION, VT 05001-0165
PO BOX 166, WHITE RIVER JUNCTION, VT 05001-0166
PO BOX 167, WHITE RIVER JUNCTION, VT 05001-0167
PO BOX 168, WHITE RIVER JUNCTION, VT 05001-0168
PO BOX 169, WHITE RIVER JUNCTION, VT 05001-0169
PO BOX 170, WHITE RIVER JUNCTION, VT 05001-0170
PO BOX 171, WHITE RIVER JUNCTION, VT 05001-0171
PO BOX 172, WHITE RIVER JUNCTION, VT 05001-0172
PO BOX 173, WHITE RIVER JUNCTION, VT 05001-0173
PO BOX 174, WHITE RIVER JUNCTION, VT 05001-0174
PO BOX 175, WHITE RIVER JUNCTION, VT 05001-0175
PO BOX 176, WHITE RIVER JUNCTION, VT 05001-0176
PO BOX 177, WHITE RIVER JUNCTION, VT 05001-0177
PO BOX 178, WHITE RIVER JUNCTION, VT 05001-0178
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