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, OAKVILLE, CT 06779-0001
PO BOX 2, OAKVILLE, CT 06779-0002
PO BOX 3, OAKVILLE, CT 06779-0003
PO BOX 4, OAKVILLE, CT 06779-0004
PO BOX 5, OAKVILLE, CT 06779-0005
PO BOX 6, OAKVILLE, CT 06779-0006
PO BOX 7, OAKVILLE, CT 06779-0007
PO BOX 8, OAKVILLE, CT 06779-0008
PO BOX 9, OAKVILLE, CT 06779-0009
PO BOX 10, OAKVILLE, CT 06779-0010
PO BOX 11, OAKVILLE, CT 06779-0011
PO BOX 12, OAKVILLE, CT 06779-0012
PO BOX 13, OAKVILLE, CT 06779-0013
PO BOX 14, OAKVILLE, CT 06779-0014
PO BOX 15, OAKVILLE, CT 06779-0015
PO BOX 16, OAKVILLE, CT 06779-0016
PO BOX 17, OAKVILLE, CT 06779-0017
PO BOX 18, OAKVILLE, CT 06779-0018
PO BOX 19, OAKVILLE, CT 06779-0019
PO BOX 20, OAKVILLE, CT 06779-0020
PO BOX 21, OAKVILLE, CT 06779-0021
PO BOX 22, OAKVILLE, CT 06779-0022
PO BOX 23, OAKVILLE, CT 06779-0023
PO BOX 24, OAKVILLE, CT 06779-0024
PO BOX 25, OAKVILLE, CT 06779-0025
PO BOX 26, OAKVILLE, CT 06779-0026
PO BOX 27, OAKVILLE, CT 06779-0027
PO BOX 28, OAKVILLE, CT 06779-0028
PO BOX 29, OAKVILLE, CT 06779-0029
PO BOX 30, OAKVILLE, CT 06779-0030
PO BOX 31, OAKVILLE, CT 06779-0031
PO BOX 32, OAKVILLE, CT 06779-0032
PO BOX 33, OAKVILLE, CT 06779-0033
PO BOX 34, OAKVILLE, CT 06779-0034
PO BOX 35, OAKVILLE, CT 06779-0035
PO BOX 36, OAKVILLE, CT 06779-0036
PO BOX 37, OAKVILLE, CT 06779-0037
PO BOX 38, OAKVILLE, CT 06779-0038
PO BOX 39, OAKVILLE, CT 06779-0039
PO BOX 40, OAKVILLE, CT 06779-0040
PO BOX 41, OAKVILLE, CT 06779-0041
PO BOX 42, OAKVILLE, CT 06779-0042
PO BOX 43, OAKVILLE, CT 06779-0043
PO BOX 44, OAKVILLE, CT 06779-0044
PO BOX 45, OAKVILLE, CT 06779-0045
PO BOX 46, OAKVILLE, CT 06779-0046
PO BOX 47, OAKVILLE, CT 06779-0047
PO BOX 48, OAKVILLE, CT 06779-0048
PO BOX 49, OAKVILLE, CT 06779-0049
PO BOX 50, OAKVILLE, CT 06779-0050
PO BOX 51, OAKVILLE, CT 06779-0051
PO BOX 52, OAKVILLE, CT 06779-0052
PO BOX 53, OAKVILLE, CT 06779-0053
PO BOX 54, OAKVILLE, CT 06779-0054
PO BOX 55, OAKVILLE, CT 06779-0055
PO BOX 56, OAKVILLE, CT 06779-0056
PO BOX 57, OAKVILLE, CT 06779-0057
PO BOX 58, OAKVILLE, CT 06779-0058
PO BOX 59, OAKVILLE, CT 06779-0059
PO BOX 60, OAKVILLE, CT 06779-0060
PO BOX 61, OAKVILLE, CT 06779-0061
PO BOX 62, OAKVILLE, CT 06779-0062
PO BOX 63, OAKVILLE, CT 06779-0063
PO BOX 64, OAKVILLE, CT 06779-0064
PO BOX 65, OAKVILLE, CT 06779-0065
PO BOX 66, OAKVILLE, CT 06779-0066
PO BOX 67, OAKVILLE, CT 06779-0067
PO BOX 68, OAKVILLE, CT 06779-0068
PO BOX 69, OAKVILLE, CT 06779-0069
PO BOX 70, OAKVILLE, CT 06779-0070
PO BOX 71, OAKVILLE, CT 06779-0071
PO BOX 72, OAKVILLE, CT 06779-0072
PO BOX 73, OAKVILLE, CT 06779-0073
PO BOX 74, OAKVILLE, CT 06779-0074
PO BOX 75, OAKVILLE, CT 06779-0075
PO BOX 76, OAKVILLE, CT 06779-0076
PO BOX 77, OAKVILLE, CT 06779-0077
PO BOX 78, OAKVILLE, CT 06779-0078
PO BOX 79, OAKVILLE, CT 06779-0079
PO BOX 80, OAKVILLE, CT 06779-0080
PO BOX 81, OAKVILLE, CT 06779-0081
PO BOX 82, OAKVILLE, CT 06779-0082
PO BOX 83, OAKVILLE, CT 06779-0083
PO BOX 84, OAKVILLE, CT 06779-0084
PO BOX 85, OAKVILLE, CT 06779-0085
PO BOX 86, OAKVILLE, CT 06779-0086
PO BOX 87, OAKVILLE, CT 06779-0087
PO BOX 88, OAKVILLE, CT 06779-0088
PO BOX 89, OAKVILLE, CT 06779-0089
PO BOX 90, OAKVILLE, CT 06779-0090
PO BOX 91, OAKVILLE, CT 06779-0091
PO BOX 92, OAKVILLE, CT 06779-0092
PO BOX 93, OAKVILLE, CT 06779-0093
PO BOX 94, OAKVILLE, CT 06779-0094
PO BOX 95, OAKVILLE, CT 06779-0095
PO BOX 96, OAKVILLE, CT 06779-0096
PO BOX 97, OAKVILLE, CT 06779-0097
PO BOX 98, OAKVILLE, CT 06779-0098
PO BOX 99, OAKVILLE, CT 06779-0099
PO BOX 100, OAKVILLE, CT 06779-0100
PO BOX 101, OAKVILLE, CT 06779-0101
PO BOX 102, OAKVILLE, CT 06779-0102
PO BOX 103, OAKVILLE, CT 06779-0103
PO BOX 104, OAKVILLE, CT 06779-0104
PO BOX 105, OAKVILLE, CT 06779-0105
PO BOX 106, OAKVILLE, CT 06779-0106
PO BOX 107, OAKVILLE, CT 06779-0107
PO BOX 108, OAKVILLE, CT 06779-0108
PO BOX 109, OAKVILLE, CT 06779-0109
PO BOX 110, OAKVILLE, CT 06779-0110
PO BOX 111, OAKVILLE, CT 06779-0111
PO BOX 112, OAKVILLE, CT 06779-0112
PO BOX 113, OAKVILLE, CT 06779-0113
PO BOX 114, OAKVILLE, CT 06779-0114
PO BOX 115, OAKVILLE, CT 06779-0115
PO BOX 116, OAKVILLE, CT 06779-0116
PO BOX 117, OAKVILLE, CT 06779-0117
PO BOX 118, OAKVILLE, CT 06779-0118
PO BOX 119, OAKVILLE, CT 06779-0119
PO BOX 120, OAKVILLE, CT 06779-0120
PO BOX 121, OAKVILLE, CT 06779-0121
PO BOX 122, OAKVILLE, CT 06779-0122
PO BOX 123, OAKVILLE, CT 06779-0123
PO BOX 124, OAKVILLE, CT 06779-0124
PO BOX 125, OAKVILLE, CT 06779-0125
PO BOX 126, OAKVILLE, CT 06779-0126
PO BOX 127, OAKVILLE, CT 06779-0127
PO BOX 128, OAKVILLE, CT 06779-0128
PO BOX 129, OAKVILLE, CT 06779-0129
PO BOX 130, OAKVILLE, CT 06779-0130
PO BOX 131, OAKVILLE, CT 06779-0131
PO BOX 132, OAKVILLE, CT 06779-0132
PO BOX 133, OAKVILLE, CT 06779-0133
PO BOX 134, OAKVILLE, CT 06779-0134
PO BOX 135, OAKVILLE, CT 06779-0135
PO BOX 136, OAKVILLE, CT 06779-0136
PO BOX 137, OAKVILLE, CT 06779-0137
PO BOX 138, OAKVILLE, CT 06779-0138
PO BOX 139, OAKVILLE, CT 06779-0139
PO BOX 140, OAKVILLE, CT 06779-0140
PO BOX 141, OAKVILLE, CT 06779-0141
PO BOX 142, OAKVILLE, CT 06779-0142
PO BOX 143, OAKVILLE, CT 06779-0143
PO BOX 144, OAKVILLE, CT 06779-0144
PO BOX 145, OAKVILLE, CT 06779-0145
PO BOX 146, OAKVILLE, CT 06779-0146
PO BOX 147, OAKVILLE, CT 06779-0147
PO BOX 148, OAKVILLE, CT 06779-0148
PO BOX 149, OAKVILLE, CT 06779-0149
PO BOX 150, OAKVILLE, CT 06779-0150
PO BOX 151, OAKVILLE, CT 06779-0151
PO BOX 152, OAKVILLE, CT 06779-0152
PO BOX 153, OAKVILLE, CT 06779-0153
PO BOX 154, OAKVILLE, CT 06779-0154
PO BOX 155, OAKVILLE, CT 06779-0155
PO BOX 156, OAKVILLE, CT 06779-0156
PO BOX 157, OAKVILLE, CT 06779-0157
PO BOX 158, OAKVILLE, CT 06779-0158
PO BOX 159, OAKVILLE, CT 06779-0159
PO BOX 160, OAKVILLE, CT 06779-0160
PO BOX 161, OAKVILLE, CT 06779-0161
PO BOX 162, OAKVILLE, CT 06779-0162
PO BOX 163, OAKVILLE, CT 06779-0163
PO BOX 164, OAKVILLE, CT 06779-0164
PO BOX 165, OAKVILLE, CT 06779-0165
PO BOX 166, OAKVILLE, CT 06779-0166
PO BOX 167, OAKVILLE, CT 06779-0167
PO BOX 168, OAKVILLE, CT 06779-0168
PO BOX 169, OAKVILLE, CT 06779-0169
PO BOX 170, OAKVILLE, CT 06779-0170
PO BOX 171, OAKVILLE, CT 06779-0171
PO BOX 172, OAKVILLE, CT 06779-0172
PO BOX 173, OAKVILLE, CT 06779-0173
PO BOX 174, OAKVILLE, CT 06779-0174
PO BOX 175, OAKVILLE, CT 06779-0175
PO BOX 176, OAKVILLE, CT 06779-0176
PO BOX 177, OAKVILLE, CT 06779-0177
PO BOX 178, OAKVILLE, CT 06779-0178
PO BOX 179, OAKVILLE, CT 06779-0179
PO BOX 180, OAKVILLE, CT 06779-0180
PO BOX 181, OAKVILLE, CT 06779-0181
PO BOX 182, OAKVILLE, CT 06779-0182
PO BOX 183, OAKVILLE, CT 06779-0183
PO BOX 184, OAKVILLE, CT 06779-0184
PO BOX 185, OAKVILLE, CT 06779-0185
PO BOX 186, OAKVILLE, CT 06779-0186
PO BOX 187, OAKVILLE, CT 06779-0187
PO BOX 188, OAKVILLE, CT 06779-0188
PO BOX 189, OAKVILLE, CT 06779-0189
PO BOX 190, OAKVILLE, CT 06779-0190
PO BOX 191, OAKVILLE, CT 06779-0191
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