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, SOUTHINGTON, CT 06489-0001
PO BOX 2, SOUTHINGTON, CT 06489-0002
PO BOX 3, SOUTHINGTON, CT 06489-0003
PO BOX 4, SOUTHINGTON, CT 06489-0004
PO BOX 5, SOUTHINGTON, CT 06489-0005
PO BOX 6, SOUTHINGTON, CT 06489-0006
PO BOX 7, SOUTHINGTON, CT 06489-0007
PO BOX 8, SOUTHINGTON, CT 06489-0008
PO BOX 9, SOUTHINGTON, CT 06489-0009
PO BOX 10, SOUTHINGTON, CT 06489-0010
PO BOX 11, SOUTHINGTON, CT 06489-0011
PO BOX 12, SOUTHINGTON, CT 06489-0012
PO BOX 13, SOUTHINGTON, CT 06489-0013
PO BOX 14, SOUTHINGTON, CT 06489-0014
PO BOX 15, SOUTHINGTON, CT 06489-0015
PO BOX 16, SOUTHINGTON, CT 06489-0016
PO BOX 17, SOUTHINGTON, CT 06489-0017
PO BOX 18, SOUTHINGTON, CT 06489-0018
PO BOX 19, SOUTHINGTON, CT 06489-0019
PO BOX 20, SOUTHINGTON, CT 06489-0020
PO BOX 21, SOUTHINGTON, CT 06489-0021
PO BOX 22, SOUTHINGTON, CT 06489-0022
PO BOX 23, SOUTHINGTON, CT 06489-0023
PO BOX 24, SOUTHINGTON, CT 06489-0024
PO BOX 25, SOUTHINGTON, CT 06489-0025
PO BOX 26, SOUTHINGTON, CT 06489-0026
PO BOX 27, SOUTHINGTON, CT 06489-0027
PO BOX 28, SOUTHINGTON, CT 06489-0028
PO BOX 29, SOUTHINGTON, CT 06489-0029
PO BOX 30, SOUTHINGTON, CT 06489-0030
PO BOX 31, SOUTHINGTON, CT 06489-0031
PO BOX 32, SOUTHINGTON, CT 06489-0032
PO BOX 33, SOUTHINGTON, CT 06489-0033
PO BOX 34, SOUTHINGTON, CT 06489-0034
PO BOX 35, SOUTHINGTON, CT 06489-0035
PO BOX 36, SOUTHINGTON, CT 06489-0036
PO BOX 37, SOUTHINGTON, CT 06489-0037
PO BOX 38, SOUTHINGTON, CT 06489-0038
PO BOX 39, SOUTHINGTON, CT 06489-0039
PO BOX 40, SOUTHINGTON, CT 06489-0040
PO BOX 41, SOUTHINGTON, CT 06489-0041
PO BOX 42, SOUTHINGTON, CT 06489-0042
PO BOX 43, SOUTHINGTON, CT 06489-0043
PO BOX 44, SOUTHINGTON, CT 06489-0044
PO BOX 45, SOUTHINGTON, CT 06489-0045
PO BOX 46, SOUTHINGTON, CT 06489-0046
PO BOX 47, SOUTHINGTON, CT 06489-0047
PO BOX 48, SOUTHINGTON, CT 06489-0048
PO BOX 49, SOUTHINGTON, CT 06489-0049
PO BOX 50, SOUTHINGTON, CT 06489-0050
PO BOX 51, SOUTHINGTON, CT 06489-0051
PO BOX 52, SOUTHINGTON, CT 06489-0052
PO BOX 53, SOUTHINGTON, CT 06489-0053
PO BOX 54, SOUTHINGTON, CT 06489-0054
PO BOX 55, SOUTHINGTON, CT 06489-0055
PO BOX 56, SOUTHINGTON, CT 06489-0056
PO BOX 57, SOUTHINGTON, CT 06489-0057
PO BOX 58, SOUTHINGTON, CT 06489-0058
PO BOX 59, SOUTHINGTON, CT 06489-0059
PO BOX 60, SOUTHINGTON, CT 06489-0060
PO BOX 61, SOUTHINGTON, CT 06489-0061
PO BOX 62, SOUTHINGTON, CT 06489-0062
PO BOX 63, SOUTHINGTON, CT 06489-0063
PO BOX 64, SOUTHINGTON, CT 06489-0064
PO BOX 65, SOUTHINGTON, CT 06489-0065
PO BOX 66, SOUTHINGTON, CT 06489-0066
PO BOX 67, SOUTHINGTON, CT 06489-0067
PO BOX 68, SOUTHINGTON, CT 06489-0068
PO BOX 69, SOUTHINGTON, CT 06489-0069
PO BOX 70, SOUTHINGTON, CT 06489-0070
PO BOX 71, SOUTHINGTON, CT 06489-0071
PO BOX 72, SOUTHINGTON, CT 06489-0072
PO BOX 73, SOUTHINGTON, CT 06489-0073
PO BOX 74, SOUTHINGTON, CT 06489-0074
PO BOX 75, SOUTHINGTON, CT 06489-0075
PO BOX 76, SOUTHINGTON, CT 06489-0076
PO BOX 77, SOUTHINGTON, CT 06489-0077
PO BOX 78, SOUTHINGTON, CT 06489-0078
PO BOX 79, SOUTHINGTON, CT 06489-0079
PO BOX 80, SOUTHINGTON, CT 06489-0080
PO BOX 81, SOUTHINGTON, CT 06489-0081
PO BOX 82, SOUTHINGTON, CT 06489-0082
PO BOX 83, SOUTHINGTON, CT 06489-0083
PO BOX 84, SOUTHINGTON, CT 06489-0084
PO BOX 85, SOUTHINGTON, CT 06489-0085
PO BOX 86, SOUTHINGTON, CT 06489-0086
PO BOX 87, SOUTHINGTON, CT 06489-0087
PO BOX 88, SOUTHINGTON, CT 06489-0088
PO BOX 89, SOUTHINGTON, CT 06489-0089
PO BOX 90, SOUTHINGTON, CT 06489-0090
PO BOX 91, SOUTHINGTON, CT 06489-0091
PO BOX 92, SOUTHINGTON, CT 06489-0092
PO BOX 93, SOUTHINGTON, CT 06489-0093
PO BOX 94, SOUTHINGTON, CT 06489-0094
PO BOX 95, SOUTHINGTON, CT 06489-0095
PO BOX 96, SOUTHINGTON, CT 06489-0096
PO BOX 97, SOUTHINGTON, CT 06489-0097
PO BOX 98, SOUTHINGTON, CT 06489-0098
PO BOX 99, SOUTHINGTON, CT 06489-0099
PO BOX 100, SOUTHINGTON, CT 06489-0100
PO BOX 101, SOUTHINGTON, CT 06489-0101
PO BOX 102, SOUTHINGTON, CT 06489-0102
PO BOX 103, SOUTHINGTON, CT 06489-0103
PO BOX 104, SOUTHINGTON, CT 06489-0104
PO BOX 105, SOUTHINGTON, CT 06489-0105
PO BOX 106, SOUTHINGTON, CT 06489-0106
PO BOX 107, SOUTHINGTON, CT 06489-0107
PO BOX 108, SOUTHINGTON, CT 06489-0108
PO BOX 109, SOUTHINGTON, CT 06489-0109
PO BOX 110, SOUTHINGTON, CT 06489-0110
PO BOX 111, SOUTHINGTON, CT 06489-0111
PO BOX 112, SOUTHINGTON, CT 06489-0112
PO BOX 113, SOUTHINGTON, CT 06489-0113
PO BOX 114, SOUTHINGTON, CT 06489-0114
PO BOX 115, SOUTHINGTON, CT 06489-0115
PO BOX 116, SOUTHINGTON, CT 06489-0116
PO BOX 117, SOUTHINGTON, CT 06489-0117
PO BOX 118, SOUTHINGTON, CT 06489-0118
PO BOX 119, SOUTHINGTON, CT 06489-0119
PO BOX 120, SOUTHINGTON, CT 06489-0120
PO BOX 121, SOUTHINGTON, CT 06489-0121
PO BOX 122, SOUTHINGTON, CT 06489-0122
PO BOX 123, SOUTHINGTON, CT 06489-0123
PO BOX 124, SOUTHINGTON, CT 06489-0124
PO BOX 125, SOUTHINGTON, CT 06489-0125
PO BOX 126, SOUTHINGTON, CT 06489-0126
PO BOX 127, SOUTHINGTON, CT 06489-0127
PO BOX 128, SOUTHINGTON, CT 06489-0128
PO BOX 129, SOUTHINGTON, CT 06489-0129
PO BOX 130, SOUTHINGTON, CT 06489-0130
PO BOX 131, SOUTHINGTON, CT 06489-0131
PO BOX 132, SOUTHINGTON, CT 06489-0132
PO BOX 133, SOUTHINGTON, CT 06489-0133
PO BOX 134, SOUTHINGTON, CT 06489-0134
PO BOX 135, SOUTHINGTON, CT 06489-0135
PO BOX 136, SOUTHINGTON, CT 06489-0136
PO BOX 137, SOUTHINGTON, CT 06489-0137
PO BOX 138, SOUTHINGTON, CT 06489-0138
PO BOX 139, SOUTHINGTON, CT 06489-0139
PO BOX 140, SOUTHINGTON, CT 06489-0140
PO BOX 141, SOUTHINGTON, CT 06489-0141
PO BOX 142, SOUTHINGTON, CT 06489-0142
PO BOX 143, SOUTHINGTON, CT 06489-0143
PO BOX 144, SOUTHINGTON, CT 06489-0144
PO BOX 145, SOUTHINGTON, CT 06489-0145
PO BOX 146, SOUTHINGTON, CT 06489-0146
PO BOX 147, SOUTHINGTON, CT 06489-0147
PO BOX 148, SOUTHINGTON, CT 06489-0148
PO BOX 149, SOUTHINGTON, CT 06489-0149
PO BOX 150, SOUTHINGTON, CT 06489-0150
PO BOX 151, SOUTHINGTON, CT 06489-0151
PO BOX 152, SOUTHINGTON, CT 06489-0152
PO BOX 153, SOUTHINGTON, CT 06489-0153
PO BOX 154, SOUTHINGTON, CT 06489-0154
PO BOX 155, SOUTHINGTON, CT 06489-0155
PO BOX 156, SOUTHINGTON, CT 06489-0156
PO BOX 157, SOUTHINGTON, CT 06489-0157
PO BOX 158, SOUTHINGTON, CT 06489-0158
PO BOX 159, SOUTHINGTON, CT 06489-0159
PO BOX 160, SOUTHINGTON, CT 06489-0160
PO BOX 161, SOUTHINGTON, CT 06489-0161
PO BOX 162, SOUTHINGTON, CT 06489-0162
PO BOX 163, SOUTHINGTON, CT 06489-0163
PO BOX 164, SOUTHINGTON, CT 06489-0164
PO BOX 165, SOUTHINGTON, CT 06489-0165
PO BOX 166, SOUTHINGTON, CT 06489-0166
PO BOX 167, SOUTHINGTON, CT 06489-0167
PO BOX 168, SOUTHINGTON, CT 06489-0168
PO BOX 169, SOUTHINGTON, CT 06489-0169
PO BOX 170, SOUTHINGTON, CT 06489-0170
PO BOX 171, SOUTHINGTON, CT 06489-0171
PO BOX 172, SOUTHINGTON, CT 06489-0172
PO BOX 173, SOUTHINGTON, CT 06489-0173
PO BOX 174, SOUTHINGTON, CT 06489-0174
PO BOX 175, SOUTHINGTON, CT 06489-0175
PO BOX 176, SOUTHINGTON, CT 06489-0176
PO BOX 177, SOUTHINGTON, CT 06489-0177
PO BOX 178, SOUTHINGTON, CT 06489-0178
PO BOX 179, SOUTHINGTON, CT 06489-0179
PO BOX 180, SOUTHINGTON, CT 06489-0180
PO BOX 181, SOUTHINGTON, CT 06489-0181
PO BOX 182, SOUTHINGTON, CT 06489-0182
PO BOX 183, SOUTHINGTON, CT 06489-0183
PO BOX 184, SOUTHINGTON, CT 06489-0184
PO BOX 185, SOUTHINGTON, CT 06489-0185
PO BOX 186, SOUTHINGTON, CT 06489-0186
PO BOX 187, SOUTHINGTON, CT 06489-0187
PO BOX 188, SOUTHINGTON, CT 06489-0188
PO BOX 189, SOUTHINGTON, CT 06489-0189
PO BOX 190, SOUTHINGTON, CT 06489-0190
PO BOX 191, SOUTHINGTON, CT 06489-0191
PO BOX 192, SOUTHINGTON, CT 06489-0192
PO BOX 193, SOUTHINGTON, CT 06489-0193
PO BOX 194, SOUTHINGTON, CT 06489-0194
PO BOX 195, SOUTHINGTON, CT 06489-0195
PO BOX 196, SOUTHINGTON, CT 06489-0196
PO BOX 197, SOUTHINGTON, CT 06489-0197
PO BOX 198, SOUTHINGTON, CT 06489-0198
PO BOX 199, SOUTHINGTON, CT 06489-0199
PO BOX 200, SOUTHINGTON, CT 06489-0200
PO BOX 201, SOUTHINGTON, CT 06489-0201
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