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, NEW TOWN, MA 02456-0001
PO BOX 2, NEW TOWN, MA 02456-0002
PO BOX 3, NEW TOWN, MA 02456-0003
PO BOX 4, NEW TOWN, MA 02456-0004
PO BOX 5, NEW TOWN, MA 02456-0005
PO BOX 6, NEW TOWN, MA 02456-0006
PO BOX 7, NEW TOWN, MA 02456-0007
PO BOX 8, NEW TOWN, MA 02456-0008
PO BOX 9, NEW TOWN, MA 02456-0009
PO BOX 10, NEW TOWN, MA 02456-0010
PO BOX 11, NEW TOWN, MA 02456-0011
PO BOX 12, NEW TOWN, MA 02456-0012
PO BOX 13, NEW TOWN, MA 02456-0013
PO BOX 14, NEW TOWN, MA 02456-0014
PO BOX 15, NEW TOWN, MA 02456-0015
PO BOX 16, NEW TOWN, MA 02456-0016
PO BOX 17, NEW TOWN, MA 02456-0017
PO BOX 18, NEW TOWN, MA 02456-0018
PO BOX 19, NEW TOWN, MA 02456-0019
PO BOX 20, NEW TOWN, MA 02456-0020
PO BOX 21, NEW TOWN, MA 02456-0021
PO BOX 22, NEW TOWN, MA 02456-0022
PO BOX 23, NEW TOWN, MA 02456-0023
PO BOX 24, NEW TOWN, MA 02456-0024
PO BOX 25, NEW TOWN, MA 02456-0025
PO BOX 26, NEW TOWN, MA 02456-0026
PO BOX 27, NEW TOWN, MA 02456-0027
PO BOX 28, NEW TOWN, MA 02456-0028
PO BOX 29, NEW TOWN, MA 02456-0029
PO BOX 30, NEW TOWN, MA 02456-0030
PO BOX 31, NEW TOWN, MA 02456-0031
PO BOX 32, NEW TOWN, MA 02456-0032
PO BOX 33, NEW TOWN, MA 02456-0033
PO BOX 34, NEW TOWN, MA 02456-0034
PO BOX 35, NEW TOWN, MA 02456-0035
PO BOX 36, NEW TOWN, MA 02456-0036
PO BOX 37, NEW TOWN, MA 02456-0037
PO BOX 38, NEW TOWN, MA 02456-0038
PO BOX 39, NEW TOWN, MA 02456-0039
PO BOX 40, NEW TOWN, MA 02456-0040
PO BOX 41, NEW TOWN, MA 02456-0041
PO BOX 42, NEW TOWN, MA 02456-0042
PO BOX 43, NEW TOWN, MA 02456-0043
PO BOX 44, NEW TOWN, MA 02456-0044
PO BOX 45, NEW TOWN, MA 02456-0045
PO BOX 46, NEW TOWN, MA 02456-0046
PO BOX 47, NEW TOWN, MA 02456-0047
PO BOX 48, NEW TOWN, MA 02456-0048
PO BOX 49, NEW TOWN, MA 02456-0049
PO BOX 50, NEW TOWN, MA 02456-0050
PO BOX 51, NEW TOWN, MA 02456-0051
PO BOX 52, NEW TOWN, MA 02456-0052
PO BOX 53, NEW TOWN, MA 02456-0053
PO BOX 54, NEW TOWN, MA 02456-0054
PO BOX 55, NEW TOWN, MA 02456-0055
PO BOX 56, NEW TOWN, MA 02456-0056
PO BOX 57, NEW TOWN, MA 02456-0057
PO BOX 58, NEW TOWN, MA 02456-0058
PO BOX 59, NEW TOWN, MA 02456-0059
PO BOX 60, NEW TOWN, MA 02456-0060
PO BOX 61, NEW TOWN, MA 02456-0061
PO BOX 62, NEW TOWN, MA 02456-0062
PO BOX 63, NEW TOWN, MA 02456-0063
PO BOX 64, NEW TOWN, MA 02456-0064
PO BOX 65, NEW TOWN, MA 02456-0065
PO BOX 66, NEW TOWN, MA 02456-0066
PO BOX 67, NEW TOWN, MA 02456-0067
PO BOX 68, NEW TOWN, MA 02456-0068
PO BOX 69, NEW TOWN, MA 02456-0069
PO BOX 70, NEW TOWN, MA 02456-0070
PO BOX 71, NEW TOWN, MA 02456-0071
PO BOX 72, NEW TOWN, MA 02456-0072
PO BOX 73, NEW TOWN, MA 02456-0073
PO BOX 74, NEW TOWN, MA 02456-0074
PO BOX 75, NEW TOWN, MA 02456-0075
PO BOX 76, NEW TOWN, MA 02456-0076
PO BOX 77, NEW TOWN, MA 02456-0077
PO BOX 78, NEW TOWN, MA 02456-0078
PO BOX 79, NEW TOWN, MA 02456-0079
PO BOX 80, NEW TOWN, MA 02456-0080
PO BOX 81, NEW TOWN, MA 02456-0081
PO BOX 82, NEW TOWN, MA 02456-0082
PO BOX 83, NEW TOWN, MA 02456-0083
PO BOX 84, NEW TOWN, MA 02456-0084
PO BOX 85, NEW TOWN, MA 02456-0085
PO BOX 86, NEW TOWN, MA 02456-0086
PO BOX 87, NEW TOWN, MA 02456-0087
PO BOX 88, NEW TOWN, MA 02456-0088
PO BOX 89, NEW TOWN, MA 02456-0089
PO BOX 90, NEW TOWN, MA 02456-0090
PO BOX 91, NEW TOWN, MA 02456-0091
PO BOX 92, NEW TOWN, MA 02456-0092
PO BOX 93, NEW TOWN, MA 02456-0093
PO BOX 94, NEW TOWN, MA 02456-0094
PO BOX 95, NEW TOWN, MA 02456-0095
PO BOX 96, NEW TOWN, MA 02456-0096
PO BOX 97, NEW TOWN, MA 02456-0097
PO BOX 98, NEW TOWN, MA 02456-0098
PO BOX 99, NEW TOWN, MA 02456-0099
PO BOX 100, NEW TOWN, MA 02456-0100
PO BOX 101, NEW TOWN, MA 02456-0101
PO BOX 102, NEW TOWN, MA 02456-0102
PO BOX 103, NEW TOWN, MA 02456-0103
PO BOX 104, NEW TOWN, MA 02456-0104
PO BOX 105, NEW TOWN, MA 02456-0105
PO BOX 106, NEW TOWN, MA 02456-0106
PO BOX 107, NEW TOWN, MA 02456-0107
PO BOX 108, NEW TOWN, MA 02456-0108
PO BOX 109, NEW TOWN, MA 02456-0109
PO BOX 110, NEW TOWN, MA 02456-0110
PO BOX 111, NEW TOWN, MA 02456-0111
PO BOX 112, NEW TOWN, MA 02456-0112
PO BOX 113, NEW TOWN, MA 02456-0113
PO BOX 114, NEW TOWN, MA 02456-0114
PO BOX 115, NEW TOWN, MA 02456-0115
PO BOX 116, NEW TOWN, MA 02456-0116
PO BOX 117, NEW TOWN, MA 02456-0117
PO BOX 118, NEW TOWN, MA 02456-0118
PO BOX 119, NEW TOWN, MA 02456-0119
PO BOX 120, NEW TOWN, MA 02456-0120
PO BOX 121, NEW TOWN, MA 02456-0121
PO BOX 122, NEW TOWN, MA 02456-0122
PO BOX 123, NEW TOWN, MA 02456-0123
PO BOX 124, NEW TOWN, MA 02456-0124
PO BOX 125, NEW TOWN, MA 02456-0125
PO BOX 126, NEW TOWN, MA 02456-0126
PO BOX 127, NEW TOWN, MA 02456-0127
PO BOX 128, NEW TOWN, MA 02456-0128
PO BOX 129, NEW TOWN, MA 02456-0129
PO BOX 130, NEW TOWN, MA 02456-0130
PO BOX 131, NEW TOWN, MA 02456-0131
PO BOX 132, NEW TOWN, MA 02456-0132
PO BOX 133, NEW TOWN, MA 02456-0133
PO BOX 134, NEW TOWN, MA 02456-0134
PO BOX 135, NEW TOWN, MA 02456-0135
PO BOX 136, NEW TOWN, MA 02456-0136
PO BOX 137, NEW TOWN, MA 02456-0137
PO BOX 138, NEW TOWN, MA 02456-0138
PO BOX 139, NEW TOWN, MA 02456-0139
PO BOX 140, NEW TOWN, MA 02456-0140
PO BOX 141, NEW TOWN, MA 02456-0141
PO BOX 142, NEW TOWN, MA 02456-0142
PO BOX 143, NEW TOWN, MA 02456-0143
PO BOX 144, NEW TOWN, MA 02456-0144
PO BOX 145, NEW TOWN, MA 02456-0145
PO BOX 146, NEW TOWN, MA 02456-0146
PO BOX 147, NEW TOWN, MA 02456-0147
PO BOX 148, NEW TOWN, MA 02456-0148
PO BOX 149, NEW TOWN, MA 02456-0149
PO BOX 150, NEW TOWN, MA 02456-0150
PO BOX 151, NEW TOWN, MA 02456-0151
PO BOX 152, NEW TOWN, MA 02456-0152
PO BOX 153, NEW TOWN, MA 02456-0153
PO BOX 154, NEW TOWN, MA 02456-0154
PO BOX 155, NEW TOWN, MA 02456-0155
PO BOX 156, NEW TOWN, MA 02456-0156
PO BOX 157, NEW TOWN, MA 02456-0157
PO BOX 158, NEW TOWN, MA 02456-0158
PO BOX 159, NEW TOWN, MA 02456-0159
PO BOX 160, NEW TOWN, MA 02456-0160
PO BOX 161, NEW TOWN, MA 02456-0161
PO BOX 162, NEW TOWN, MA 02456-0162
PO BOX 163, NEW TOWN, MA 02456-0163
PO BOX 164, NEW TOWN, MA 02456-0164
PO BOX 165, NEW TOWN, MA 02456-0165
PO BOX 166, NEW TOWN, MA 02456-0166
PO BOX 167, NEW TOWN, MA 02456-0167
PO BOX 168, NEW TOWN, MA 02456-0168
PO BOX 169, NEW TOWN, MA 02456-0169
PO BOX 170, NEW TOWN, MA 02456-0170
PO BOX 171, NEW TOWN, MA 02456-0171
PO BOX 172, NEW TOWN, MA 02456-0172
PO BOX 173, NEW TOWN, MA 02456-0173
PO BOX 174, NEW TOWN, MA 02456-0174
PO BOX 175, NEW TOWN, MA 02456-0175
PO BOX 176, NEW TOWN, MA 02456-0176
PO BOX 177, NEW TOWN, MA 02456-0177
PO BOX 178, NEW TOWN, MA 02456-0178
PO BOX 179, NEW TOWN, MA 02456-0179
PO BOX 180, NEW TOWN, MA 02456-0180
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