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 11, BRISTOL, CT 06011-0011
PO BOX 12, BRISTOL, CT 06011-0012
PO BOX 13, BRISTOL, CT 06011-0013
PO BOX 14, BRISTOL, CT 06011-0014
PO BOX 15, BRISTOL, CT 06011-0015
PO BOX 16, BRISTOL, CT 06011-0016
PO BOX 17, BRISTOL, CT 06011-0017
PO BOX 18, BRISTOL, CT 06011-0018
PO BOX 19, BRISTOL, CT 06011-0019
PO BOX 20, BRISTOL, CT 06011-0020
PO BOX 21, BRISTOL, CT 06011-0021
PO BOX 22, BRISTOL, CT 06011-0022
PO BOX 23, BRISTOL, CT 06011-0023
PO BOX 24, BRISTOL, CT 06011-0024
PO BOX 25, BRISTOL, CT 06011-0025
PO BOX 26, BRISTOL, CT 06011-0026
PO BOX 27, BRISTOL, CT 06011-0027
PO BOX 28, BRISTOL, CT 06011-0028
PO BOX 29, BRISTOL, CT 06011-0029
PO BOX 30, BRISTOL, CT 06011-0030
PO BOX 31, BRISTOL, CT 06011-0031
PO BOX 32, BRISTOL, CT 06011-0032
PO BOX 33, BRISTOL, CT 06011-0033
PO BOX 34, BRISTOL, CT 06011-0034
PO BOX 35, BRISTOL, CT 06011-0035
PO BOX 36, BRISTOL, CT 06011-0036
PO BOX 37, BRISTOL, CT 06011-0037
PO BOX 38, BRISTOL, CT 06011-0038
PO BOX 39, BRISTOL, CT 06011-0039
PO BOX 40, BRISTOL, CT 06011-0040
PO BOX 41, BRISTOL, CT 06011-0041
PO BOX 42, BRISTOL, CT 06011-0042
PO BOX 43, BRISTOL, CT 06011-0043
PO BOX 44, BRISTOL, CT 06011-0044
PO BOX 45, BRISTOL, CT 06011-0045
PO BOX 46, BRISTOL, CT 06011-0046
PO BOX 47, BRISTOL, CT 06011-0047
PO BOX 48, BRISTOL, CT 06011-0048
PO BOX 49, BRISTOL, CT 06011-0049
PO BOX 50, BRISTOL, CT 06011-0050
PO BOX 51, BRISTOL, CT 06011-0051
PO BOX 52, BRISTOL, CT 06011-0052
PO BOX 53, BRISTOL, CT 06011-0053
PO BOX 54, BRISTOL, CT 06011-0054
PO BOX 55, BRISTOL, CT 06011-0055
PO BOX 56, BRISTOL, CT 06011-0056
PO BOX 57, BRISTOL, CT 06011-0057
PO BOX 58, BRISTOL, CT 06011-0058
PO BOX 59, BRISTOL, CT 06011-0059
PO BOX 60, BRISTOL, CT 06011-0060
PO BOX 61, BRISTOL, CT 06011-0061
PO BOX 62, BRISTOL, CT 06011-0062
PO BOX 63, BRISTOL, CT 06011-0063
PO BOX 64, BRISTOL, CT 06011-0064
PO BOX 65, BRISTOL, CT 06011-0065
PO BOX 66, BRISTOL, CT 06011-0066
PO BOX 67, BRISTOL, CT 06011-0067
PO BOX 68, BRISTOL, CT 06011-0068
PO BOX 69, BRISTOL, CT 06011-0069
PO BOX 70, BRISTOL, CT 06011-0070
PO BOX 71, BRISTOL, CT 06011-0071
PO BOX 72, BRISTOL, CT 06011-0072
PO BOX 73, BRISTOL, CT 06011-0073
PO BOX 74, BRISTOL, CT 06011-0074
PO BOX 75, BRISTOL, CT 06011-0075
PO BOX 76, BRISTOL, CT 06011-0076
PO BOX 77, BRISTOL, CT 06011-0077
PO BOX 78, BRISTOL, CT 06011-0078
PO BOX 79, BRISTOL, CT 06011-0079
PO BOX 80, BRISTOL, CT 06011-0080
PO BOX 81, BRISTOL, CT 06011-0081
PO BOX 82, BRISTOL, CT 06011-0082
PO BOX 83, BRISTOL, CT 06011-0083
PO BOX 84, BRISTOL, CT 06011-0084
PO BOX 85, BRISTOL, CT 06011-0085
PO BOX 86, BRISTOL, CT 06011-0086
PO BOX 87, BRISTOL, CT 06011-0087
PO BOX 88, BRISTOL, CT 06011-0088
PO BOX 89, BRISTOL, CT 06011-0089
PO BOX 90, BRISTOL, CT 06011-0090
PO BOX 91, BRISTOL, CT 06011-0091
PO BOX 92, BRISTOL, CT 06011-0092
PO BOX 93, BRISTOL, CT 06011-0093
PO BOX 94, BRISTOL, CT 06011-0094
PO BOX 95, BRISTOL, CT 06011-0095
PO BOX 96, BRISTOL, CT 06011-0096
PO BOX 97, BRISTOL, CT 06011-0097
PO BOX 98, BRISTOL, CT 06011-0098
PO BOX 99, BRISTOL, CT 06011-0099
PO BOX 100, BRISTOL, CT 06011-0100
PO BOX 101, BRISTOL, CT 06011-0101
PO BOX 102, BRISTOL, CT 06011-0102
PO BOX 103, BRISTOL, CT 06011-0103
PO BOX 104, BRISTOL, CT 06011-0104
PO BOX 105, BRISTOL, CT 06011-0105
PO BOX 106, BRISTOL, CT 06011-0106
PO BOX 107, BRISTOL, CT 06011-0107
PO BOX 108, BRISTOL, CT 06011-0108
PO BOX 109, BRISTOL, CT 06011-0109
PO BOX 110, BRISTOL, CT 06011-0110
PO BOX 111, BRISTOL, CT 06011-0111
PO BOX 112, BRISTOL, CT 06011-0112
PO BOX 113, BRISTOL, CT 06011-0113
PO BOX 114, BRISTOL, CT 06011-0114
PO BOX 115, BRISTOL, CT 06011-0115
PO BOX 116, BRISTOL, CT 06011-0116
PO BOX 117, BRISTOL, CT 06011-0117
PO BOX 118, BRISTOL, CT 06011-0118
PO BOX 119, BRISTOL, CT 06011-0119
PO BOX 120, BRISTOL, CT 06011-0120
PO BOX 121, BRISTOL, CT 06011-0121
PO BOX 122, BRISTOL, CT 06011-0122
PO BOX 123, BRISTOL, CT 06011-0123
PO BOX 124, BRISTOL, CT 06011-0124
PO BOX 125, BRISTOL, CT 06011-0125
PO BOX 126, BRISTOL, CT 06011-0126
PO BOX 127, BRISTOL, CT 06011-0127
PO BOX 128, BRISTOL, CT 06011-0128
PO BOX 129, BRISTOL, CT 06011-0129
PO BOX 130, BRISTOL, CT 06011-0130
PO BOX 131, BRISTOL, CT 06011-0131
PO BOX 132, BRISTOL, CT 06011-0132
PO BOX 133, BRISTOL, CT 06011-0133
PO BOX 134, BRISTOL, CT 06011-0134
PO BOX 135, BRISTOL, CT 06011-0135
PO BOX 136, BRISTOL, CT 06011-0136
PO BOX 137, BRISTOL, CT 06011-0137
PO BOX 138, BRISTOL, CT 06011-0138
PO BOX 139, BRISTOL, CT 06011-0139
PO BOX 140, BRISTOL, CT 06011-0140
PO BOX 141, BRISTOL, CT 06011-0141
PO BOX 142, BRISTOL, CT 06011-0142
PO BOX 143, BRISTOL, CT 06011-0143
PO BOX 144, BRISTOL, CT 06011-0144
PO BOX 145, BRISTOL, CT 06011-0145
PO BOX 146, BRISTOL, CT 06011-0146
PO BOX 147, BRISTOL, CT 06011-0147
PO BOX 148, BRISTOL, CT 06011-0148
PO BOX 149, BRISTOL, CT 06011-0149
PO BOX 150, BRISTOL, CT 06011-0150
PO BOX 151, BRISTOL, CT 06011-0151
PO BOX 152, BRISTOL, CT 06011-0152
PO BOX 153, BRISTOL, CT 06011-0153
PO BOX 154, BRISTOL, CT 06011-0154
PO BOX 155, BRISTOL, CT 06011-0155
PO BOX 156, BRISTOL, CT 06011-0156
PO BOX 157, BRISTOL, CT 06011-0157
PO BOX 158, BRISTOL, CT 06011-0158
PO BOX 159, BRISTOL, CT 06011-0159
PO BOX 160, BRISTOL, CT 06011-0160
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