Um número de caixa postal pode ter menos ou mais de quatro dígitos. Para as caixas postais, a regra geral é que cada caixa tenha seu próprio CEP + 4.
Os últimos quatro dígitos costumam ser um dos seguintes:
1. Zero mais os três últimos dígitos do número da caixa (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. Os últimos quatro dígitos do número da caixa (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. Se o número da caixa tiver menos de quatro dígitos, zeros suficientes prefixados na frente do número da caixa para produzir um número de quatro dígitos(eg. PO BOX 1, Shreveport LA 71161-0001).
No entanto, não existe uma regra uniforme, o CEP mais quatro são apenas para referência, o CEP + 4 deve ser consultado individualmente para cada caixa no site oficial do USPS.
PO BOX 1, BLOCK ISLAND, RI 02807-0001
PO BOX 2, BLOCK ISLAND, RI 02807-0002
PO BOX 3, BLOCK ISLAND, RI 02807-0003
PO BOX 4, BLOCK ISLAND, RI 02807-0004
PO BOX 5, BLOCK ISLAND, RI 02807-0005
PO BOX 6, BLOCK ISLAND, RI 02807-0006
PO BOX 7, BLOCK ISLAND, RI 02807-0007
PO BOX 8, BLOCK ISLAND, RI 02807-0008
PO BOX 9, BLOCK ISLAND, RI 02807-0009
PO BOX 10, BLOCK ISLAND, RI 02807-0010
PO BOX 11, BLOCK ISLAND, RI 02807-0011
PO BOX 12, BLOCK ISLAND, RI 02807-0012
PO BOX 13, BLOCK ISLAND, RI 02807-0013
PO BOX 14, BLOCK ISLAND, RI 02807-0014
PO BOX 15, BLOCK ISLAND, RI 02807-0015
PO BOX 16, BLOCK ISLAND, RI 02807-0016
PO BOX 17, BLOCK ISLAND, RI 02807-0017
PO BOX 18, BLOCK ISLAND, RI 02807-0018
PO BOX 19, BLOCK ISLAND, RI 02807-0019
PO BOX 20, BLOCK ISLAND, RI 02807-0020
PO BOX 21, BLOCK ISLAND, RI 02807-0021
PO BOX 22, BLOCK ISLAND, RI 02807-0022
PO BOX 23, BLOCK ISLAND, RI 02807-0023
PO BOX 24, BLOCK ISLAND, RI 02807-0024
PO BOX 25, BLOCK ISLAND, RI 02807-0025
PO BOX 26, BLOCK ISLAND, RI 02807-0026
PO BOX 27, BLOCK ISLAND, RI 02807-0027
PO BOX 28, BLOCK ISLAND, RI 02807-0028
PO BOX 29, BLOCK ISLAND, RI 02807-0029
PO BOX 30, BLOCK ISLAND, RI 02807-0030
PO BOX 31, BLOCK ISLAND, RI 02807-0031
PO BOX 32, BLOCK ISLAND, RI 02807-0032
PO BOX 33, BLOCK ISLAND, RI 02807-0033
PO BOX 34, BLOCK ISLAND, RI 02807-0034
PO BOX 35, BLOCK ISLAND, RI 02807-0035
PO BOX 36, BLOCK ISLAND, RI 02807-0036
PO BOX 37, BLOCK ISLAND, RI 02807-0037
PO BOX 38, BLOCK ISLAND, RI 02807-0038
PO BOX 39, BLOCK ISLAND, RI 02807-0039
PO BOX 40, BLOCK ISLAND, RI 02807-0040
PO BOX 41, BLOCK ISLAND, RI 02807-0041
PO BOX 42, BLOCK ISLAND, RI 02807-0042
PO BOX 43, BLOCK ISLAND, RI 02807-0043
PO BOX 44, BLOCK ISLAND, RI 02807-0044
PO BOX 45, BLOCK ISLAND, RI 02807-0045
PO BOX 46, BLOCK ISLAND, RI 02807-0046
PO BOX 47, BLOCK ISLAND, RI 02807-0047
PO BOX 48, BLOCK ISLAND, RI 02807-0048
PO BOX 49, BLOCK ISLAND, RI 02807-0049
PO BOX 50, BLOCK ISLAND, RI 02807-0050
PO BOX 51, BLOCK ISLAND, RI 02807-0051
PO BOX 52, BLOCK ISLAND, RI 02807-0052
PO BOX 53, BLOCK ISLAND, RI 02807-0053
PO BOX 54, BLOCK ISLAND, RI 02807-0054
PO BOX 55, BLOCK ISLAND, RI 02807-0055
PO BOX 56, BLOCK ISLAND, RI 02807-0056
PO BOX 57, BLOCK ISLAND, RI 02807-0057
PO BOX 58, BLOCK ISLAND, RI 02807-0058
PO BOX 59, BLOCK ISLAND, RI 02807-0059
PO BOX 60, BLOCK ISLAND, RI 02807-0060
PO BOX 61, BLOCK ISLAND, RI 02807-0061
PO BOX 62, BLOCK ISLAND, RI 02807-0062
PO BOX 63, BLOCK ISLAND, RI 02807-0063
PO BOX 64, BLOCK ISLAND, RI 02807-0064
PO BOX 65, BLOCK ISLAND, RI 02807-0065
PO BOX 66, BLOCK ISLAND, RI 02807-0066
PO BOX 67, BLOCK ISLAND, RI 02807-0067
PO BOX 68, BLOCK ISLAND, RI 02807-0068
PO BOX 69, BLOCK ISLAND, RI 02807-0069
PO BOX 70, BLOCK ISLAND, RI 02807-0070
PO BOX 71, BLOCK ISLAND, RI 02807-0071
PO BOX 72, BLOCK ISLAND, RI 02807-0072
PO BOX 73, BLOCK ISLAND, RI 02807-0073
PO BOX 74, BLOCK ISLAND, RI 02807-0074
PO BOX 75, BLOCK ISLAND, RI 02807-0075
PO BOX 76, BLOCK ISLAND, RI 02807-0076
PO BOX 77, BLOCK ISLAND, RI 02807-0077
PO BOX 78, BLOCK ISLAND, RI 02807-0078
PO BOX 79, BLOCK ISLAND, RI 02807-0079
PO BOX 80, BLOCK ISLAND, RI 02807-0080
PO BOX 81, BLOCK ISLAND, RI 02807-0081
PO BOX 82, BLOCK ISLAND, RI 02807-0082
PO BOX 83, BLOCK ISLAND, RI 02807-0083
PO BOX 84, BLOCK ISLAND, RI 02807-0084
PO BOX 85, BLOCK ISLAND, RI 02807-0085
PO BOX 86, BLOCK ISLAND, RI 02807-0086
PO BOX 87, BLOCK ISLAND, RI 02807-0087
PO BOX 88, BLOCK ISLAND, RI 02807-0088
PO BOX 89, BLOCK ISLAND, RI 02807-0089
PO BOX 90, BLOCK ISLAND, RI 02807-0090
PO BOX 91, BLOCK ISLAND, RI 02807-0091
PO BOX 92, BLOCK ISLAND, RI 02807-0092
PO BOX 93, BLOCK ISLAND, RI 02807-0093
PO BOX 94, BLOCK ISLAND, RI 02807-0094
PO BOX 95, BLOCK ISLAND, RI 02807-0095
PO BOX 96, BLOCK ISLAND, RI 02807-0096
PO BOX 97, BLOCK ISLAND, RI 02807-0097
PO BOX 98, BLOCK ISLAND, RI 02807-0098
PO BOX 99, BLOCK ISLAND, RI 02807-0099
PO BOX 100, BLOCK ISLAND, RI 02807-0100
PO BOX 101, BLOCK ISLAND, RI 02807-0101
PO BOX 102, BLOCK ISLAND, RI 02807-0102
PO BOX 103, BLOCK ISLAND, RI 02807-0103
PO BOX 104, BLOCK ISLAND, RI 02807-0104
PO BOX 105, BLOCK ISLAND, RI 02807-0105
PO BOX 106, BLOCK ISLAND, RI 02807-0106
PO BOX 107, BLOCK ISLAND, RI 02807-0107
PO BOX 108, BLOCK ISLAND, RI 02807-0108
PO BOX 109, BLOCK ISLAND, RI 02807-0109
PO BOX 110, BLOCK ISLAND, RI 02807-0110
PO BOX 111, BLOCK ISLAND, RI 02807-0111
PO BOX 112, BLOCK ISLAND, RI 02807-0112
PO BOX 113, BLOCK ISLAND, RI 02807-0113
PO BOX 114, BLOCK ISLAND, RI 02807-0114
PO BOX 115, BLOCK ISLAND, RI 02807-0115
PO BOX 116, BLOCK ISLAND, RI 02807-0116
PO BOX 117, BLOCK ISLAND, RI 02807-0117
PO BOX 118, BLOCK ISLAND, RI 02807-0118
PO BOX 119, BLOCK ISLAND, RI 02807-0119
PO BOX 120, BLOCK ISLAND, RI 02807-0120
PO BOX 121, BLOCK ISLAND, RI 02807-0121
PO BOX 122, BLOCK ISLAND, RI 02807-0122
PO BOX 123, BLOCK ISLAND, RI 02807-0123
PO BOX 124, BLOCK ISLAND, RI 02807-0124
PO BOX 125, BLOCK ISLAND, RI 02807-0125
PO BOX 126, BLOCK ISLAND, RI 02807-0126
PO BOX 127, BLOCK ISLAND, RI 02807-0127
PO BOX 128, BLOCK ISLAND, RI 02807-0128
PO BOX 129, BLOCK ISLAND, RI 02807-0129
PO BOX 130, BLOCK ISLAND, RI 02807-0130
PO BOX 131, BLOCK ISLAND, RI 02807-0131
PO BOX 132, BLOCK ISLAND, RI 02807-0132
PO BOX 133, BLOCK ISLAND, RI 02807-0133
PO BOX 134, BLOCK ISLAND, RI 02807-0134
PO BOX 135, BLOCK ISLAND, RI 02807-0135
PO BOX 136, BLOCK ISLAND, RI 02807-0136
PO BOX 137, BLOCK ISLAND, RI 02807-0137
PO BOX 138, BLOCK ISLAND, RI 02807-0138
PO BOX 139, BLOCK ISLAND, RI 02807-0139
PO BOX 140, BLOCK ISLAND, RI 02807-0140
PO BOX 141, BLOCK ISLAND, RI 02807-0141
PO BOX 142, BLOCK ISLAND, RI 02807-0142
PO BOX 143, BLOCK ISLAND, RI 02807-0143
PO BOX 144, BLOCK ISLAND, RI 02807-0144
PO BOX 145, BLOCK ISLAND, RI 02807-0145
PO BOX 146, BLOCK ISLAND, RI 02807-0146
PO BOX 147, BLOCK ISLAND, RI 02807-0147
PO BOX 148, BLOCK ISLAND, RI 02807-0148
PO BOX 149, BLOCK ISLAND, RI 02807-0149
PO BOX 150, BLOCK ISLAND, RI 02807-0150
PO BOX 151, BLOCK ISLAND, RI 02807-0151
PO BOX 152, BLOCK ISLAND, RI 02807-0152
PO BOX 153, BLOCK ISLAND, RI 02807-0153
PO BOX 154, BLOCK ISLAND, RI 02807-0154
PO BOX 155, BLOCK ISLAND, RI 02807-0155
PO BOX 156, BLOCK ISLAND, RI 02807-0156
PO BOX 157, BLOCK ISLAND, RI 02807-0157
PO BOX 158, BLOCK ISLAND, RI 02807-0158
PO BOX 159, BLOCK ISLAND, RI 02807-0159
PO BOX 160, BLOCK ISLAND, RI 02807-0160
PO BOX 161, BLOCK ISLAND, RI 02807-0161
PO BOX 162, BLOCK ISLAND, RI 02807-0162
PO BOX 163, BLOCK ISLAND, RI 02807-0163
PO BOX 164, BLOCK ISLAND, RI 02807-0164
PO BOX 165, BLOCK ISLAND, RI 02807-0165
PO BOX 166, BLOCK ISLAND, RI 02807-0166
PO BOX 167, BLOCK ISLAND, RI 02807-0167
PO BOX 168, BLOCK ISLAND, RI 02807-0168
PO BOX 169, BLOCK ISLAND, RI 02807-0169
PO BOX 170, BLOCK ISLAND, RI 02807-0170
PO BOX 171, BLOCK ISLAND, RI 02807-0171
PO BOX 172, BLOCK ISLAND, RI 02807-0172
PO BOX 173, BLOCK ISLAND, RI 02807-0173
PO BOX 174, BLOCK ISLAND, RI 02807-0174
PO BOX 175, BLOCK ISLAND, RI 02807-0175
PO BOX 176, BLOCK ISLAND, RI 02807-0176
PO BOX 177, BLOCK ISLAND, RI 02807-0177
PO BOX 178, BLOCK ISLAND, RI 02807-0178
PO BOX 179, BLOCK ISLAND, RI 02807-0179
PO BOX 180, BLOCK ISLAND, RI 02807-0180
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