Số PO BOX có thể nhỏ hơn hoặc nhiều hơn bốn chữ số. Đối với các hộp bưu điện, quy tắc chung là mỗi hộp có mã ZIP + 4 riêng.
Bốn chữ số cuối cùng thường là một trong những chữ số sau:
1. Số 0 cộng với ba chữ số cuối của số hộp (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. Bốn chữ số cuối cùng của số hộp (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. Nếu số hộp có ít hơn bốn chữ số, thì đủ số 0 được thêm vào trước số hộp để tạo ra một số có bốn chữ số(eg. PO BOX 1, Shreveport LA 71161-0001).
Tuy nhiên, không có quy tắc thống nhất, mã zip cộng với bốn chỉ mang tính chất tham khảo, mã ZIP + 4 phải được tra cứu riêng cho từng ô trong trang web chính thức của USPS.
PO BOX 1, ORRS ISLAND, ME 04066-0001
PO BOX 2, ORRS ISLAND, ME 04066-0002
PO BOX 3, ORRS ISLAND, ME 04066-0003
PO BOX 4, ORRS ISLAND, ME 04066-0004
PO BOX 5, ORRS ISLAND, ME 04066-0005
PO BOX 6, ORRS ISLAND, ME 04066-0006
PO BOX 7, ORRS ISLAND, ME 04066-0007
PO BOX 8, ORRS ISLAND, ME 04066-0008
PO BOX 9, ORRS ISLAND, ME 04066-0009
PO BOX 10, ORRS ISLAND, ME 04066-0010
PO BOX 11, ORRS ISLAND, ME 04066-0011
PO BOX 12, ORRS ISLAND, ME 04066-0012
PO BOX 13, ORRS ISLAND, ME 04066-0013
PO BOX 14, ORRS ISLAND, ME 04066-0014
PO BOX 15, ORRS ISLAND, ME 04066-0015
PO BOX 16, ORRS ISLAND, ME 04066-0016
PO BOX 17, ORRS ISLAND, ME 04066-0017
PO BOX 18, ORRS ISLAND, ME 04066-0018
PO BOX 19, ORRS ISLAND, ME 04066-0019
PO BOX 20, ORRS ISLAND, ME 04066-0020
PO BOX 21, ORRS ISLAND, ME 04066-0021
PO BOX 22, ORRS ISLAND, ME 04066-0022
PO BOX 23, ORRS ISLAND, ME 04066-0023
PO BOX 24, ORRS ISLAND, ME 04066-0024
PO BOX 25, ORRS ISLAND, ME 04066-0025
PO BOX 26, ORRS ISLAND, ME 04066-0026
PO BOX 27, ORRS ISLAND, ME 04066-0027
PO BOX 28, ORRS ISLAND, ME 04066-0028
PO BOX 29, ORRS ISLAND, ME 04066-0029
PO BOX 30, ORRS ISLAND, ME 04066-0030
PO BOX 31, ORRS ISLAND, ME 04066-0031
PO BOX 32, ORRS ISLAND, ME 04066-0032
PO BOX 33, ORRS ISLAND, ME 04066-0033
PO BOX 34, ORRS ISLAND, ME 04066-0034
PO BOX 35, ORRS ISLAND, ME 04066-0035
PO BOX 36, ORRS ISLAND, ME 04066-0036
PO BOX 37, ORRS ISLAND, ME 04066-0037
PO BOX 38, ORRS ISLAND, ME 04066-0038
PO BOX 39, ORRS ISLAND, ME 04066-0039
PO BOX 40, ORRS ISLAND, ME 04066-0040
PO BOX 41, ORRS ISLAND, ME 04066-0041
PO BOX 42, ORRS ISLAND, ME 04066-0042
PO BOX 43, ORRS ISLAND, ME 04066-0043
PO BOX 44, ORRS ISLAND, ME 04066-0044
PO BOX 45, ORRS ISLAND, ME 04066-0045
PO BOX 46, ORRS ISLAND, ME 04066-0046
PO BOX 47, ORRS ISLAND, ME 04066-0047
PO BOX 48, ORRS ISLAND, ME 04066-0048
PO BOX 49, ORRS ISLAND, ME 04066-0049
PO BOX 50, ORRS ISLAND, ME 04066-0050
PO BOX 51, ORRS ISLAND, ME 04066-0051
PO BOX 52, ORRS ISLAND, ME 04066-0052
PO BOX 53, ORRS ISLAND, ME 04066-0053
PO BOX 54, ORRS ISLAND, ME 04066-0054
PO BOX 55, ORRS ISLAND, ME 04066-0055
PO BOX 56, ORRS ISLAND, ME 04066-0056
PO BOX 57, ORRS ISLAND, ME 04066-0057
PO BOX 58, ORRS ISLAND, ME 04066-0058
PO BOX 59, ORRS ISLAND, ME 04066-0059
PO BOX 60, ORRS ISLAND, ME 04066-0060
PO BOX 61, ORRS ISLAND, ME 04066-0061
PO BOX 62, ORRS ISLAND, ME 04066-0062
PO BOX 63, ORRS ISLAND, ME 04066-0063
PO BOX 64, ORRS ISLAND, ME 04066-0064
PO BOX 65, ORRS ISLAND, ME 04066-0065
PO BOX 66, ORRS ISLAND, ME 04066-0066
PO BOX 67, ORRS ISLAND, ME 04066-0067
PO BOX 68, ORRS ISLAND, ME 04066-0068
PO BOX 69, ORRS ISLAND, ME 04066-0069
PO BOX 70, ORRS ISLAND, ME 04066-0070
PO BOX 71, ORRS ISLAND, ME 04066-0071
PO BOX 72, ORRS ISLAND, ME 04066-0072
PO BOX 73, ORRS ISLAND, ME 04066-0073
PO BOX 74, ORRS ISLAND, ME 04066-0074
PO BOX 75, ORRS ISLAND, ME 04066-0075
PO BOX 76, ORRS ISLAND, ME 04066-0076
PO BOX 77, ORRS ISLAND, ME 04066-0077
PO BOX 78, ORRS ISLAND, ME 04066-0078
PO BOX 79, ORRS ISLAND, ME 04066-0079
PO BOX 80, ORRS ISLAND, ME 04066-0080
PO BOX 81, ORRS ISLAND, ME 04066-0081
PO BOX 82, ORRS ISLAND, ME 04066-0082
PO BOX 83, ORRS ISLAND, ME 04066-0083
PO BOX 84, ORRS ISLAND, ME 04066-0084
PO BOX 85, ORRS ISLAND, ME 04066-0085
PO BOX 86, ORRS ISLAND, ME 04066-0086
PO BOX 87, ORRS ISLAND, ME 04066-0087
PO BOX 88, ORRS ISLAND, ME 04066-0088
PO BOX 89, ORRS ISLAND, ME 04066-0089
PO BOX 90, ORRS ISLAND, ME 04066-0090
PO BOX 91, ORRS ISLAND, ME 04066-0091
PO BOX 92, ORRS ISLAND, ME 04066-0092
PO BOX 93, ORRS ISLAND, ME 04066-0093
PO BOX 94, ORRS ISLAND, ME 04066-0094
PO BOX 95, ORRS ISLAND, ME 04066-0095
PO BOX 96, ORRS ISLAND, ME 04066-0096
PO BOX 97, ORRS ISLAND, ME 04066-0097
PO BOX 98, ORRS ISLAND, ME 04066-0098
PO BOX 99, ORRS ISLAND, ME 04066-0099
PO BOX 100, ORRS ISLAND, ME 04066-0100
PO BOX 101, ORRS ISLAND, ME 04066-0101
PO BOX 102, ORRS ISLAND, ME 04066-0102
PO BOX 103, ORRS ISLAND, ME 04066-0103
PO BOX 104, ORRS ISLAND, ME 04066-0104
PO BOX 105, ORRS ISLAND, ME 04066-0105
PO BOX 106, ORRS ISLAND, ME 04066-0106
PO BOX 107, ORRS ISLAND, ME 04066-0107
PO BOX 108, ORRS ISLAND, ME 04066-0108
PO BOX 109, ORRS ISLAND, ME 04066-0109
PO BOX 110, ORRS ISLAND, ME 04066-0110
PO BOX 111, ORRS ISLAND, ME 04066-0111
PO BOX 112, ORRS ISLAND, ME 04066-0112
PO BOX 113, ORRS ISLAND, ME 04066-0113
PO BOX 114, ORRS ISLAND, ME 04066-0114
PO BOX 115, ORRS ISLAND, ME 04066-0115
PO BOX 116, ORRS ISLAND, ME 04066-0116
PO BOX 117, ORRS ISLAND, ME 04066-0117
PO BOX 118, ORRS ISLAND, ME 04066-0118
PO BOX 119, ORRS ISLAND, ME 04066-0119
PO BOX 120, ORRS ISLAND, ME 04066-0120
PO BOX 121, ORRS ISLAND, ME 04066-0121
PO BOX 122, ORRS ISLAND, ME 04066-0122
PO BOX 123, ORRS ISLAND, ME 04066-0123
PO BOX 124, ORRS ISLAND, ME 04066-0124
PO BOX 125, ORRS ISLAND, ME 04066-0125
PO BOX 126, ORRS ISLAND, ME 04066-0126
PO BOX 127, ORRS ISLAND, ME 04066-0127
PO BOX 128, ORRS ISLAND, ME 04066-0128
PO BOX 129, ORRS ISLAND, ME 04066-0129
PO BOX 130, ORRS ISLAND, ME 04066-0130
PO BOX 131, ORRS ISLAND, ME 04066-0131
PO BOX 132, ORRS ISLAND, ME 04066-0132
PO BOX 133, ORRS ISLAND, ME 04066-0133
PO BOX 134, ORRS ISLAND, ME 04066-0134
PO BOX 135, ORRS ISLAND, ME 04066-0135
PO BOX 136, ORRS ISLAND, ME 04066-0136
PO BOX 137, ORRS ISLAND, ME 04066-0137
PO BOX 138, ORRS ISLAND, ME 04066-0138
PO BOX 139, ORRS ISLAND, ME 04066-0139
PO BOX 140, ORRS ISLAND, ME 04066-0140
PO BOX 141, ORRS ISLAND, ME 04066-0141
PO BOX 142, ORRS ISLAND, ME 04066-0142
PO BOX 143, ORRS ISLAND, ME 04066-0143
PO BOX 144, ORRS ISLAND, ME 04066-0144
PO BOX 145, ORRS ISLAND, ME 04066-0145
PO BOX 146, ORRS ISLAND, ME 04066-0146
PO BOX 147, ORRS ISLAND, ME 04066-0147
PO BOX 148, ORRS ISLAND, ME 04066-0148
PO BOX 149, ORRS ISLAND, ME 04066-0149
PO BOX 150, ORRS ISLAND, ME 04066-0150
PO BOX 151, ORRS ISLAND, ME 04066-0151
PO BOX 152, ORRS ISLAND, ME 04066-0152
PO BOX 153, ORRS ISLAND, ME 04066-0153
PO BOX 154, ORRS ISLAND, ME 04066-0154
PO BOX 155, ORRS ISLAND, ME 04066-0155
PO BOX 156, ORRS ISLAND, ME 04066-0156
PO BOX 157, ORRS ISLAND, ME 04066-0157
PO BOX 158, ORRS ISLAND, ME 04066-0158
PO BOX 159, ORRS ISLAND, ME 04066-0159
PO BOX 160, ORRS ISLAND, ME 04066-0160
PO BOX 161, ORRS ISLAND, ME 04066-0161
PO BOX 162, ORRS ISLAND, ME 04066-0162
PO BOX 163, ORRS ISLAND, ME 04066-0163
PO BOX 164, ORRS ISLAND, ME 04066-0164
PO BOX 165, ORRS ISLAND, ME 04066-0165
PO BOX 166, ORRS ISLAND, ME 04066-0166
PO BOX 167, ORRS ISLAND, ME 04066-0167
PO BOX 168, ORRS ISLAND, ME 04066-0168
PO BOX 169, ORRS ISLAND, ME 04066-0169
PO BOX 170, ORRS ISLAND, ME 04066-0170
PO BOX 171, ORRS ISLAND, ME 04066-0171
PO BOX 172, ORRS ISLAND, ME 04066-0172
PO BOX 173, ORRS ISLAND, ME 04066-0173
PO BOX 174, ORRS ISLAND, ME 04066-0174
PO BOX 175, ORRS ISLAND, ME 04066-0175
PO BOX 176, ORRS ISLAND, ME 04066-0176
PO BOX 177, ORRS ISLAND, ME 04066-0177
PO BOX 178, ORRS ISLAND, ME 04066-0178
PO BOX 179, ORRS ISLAND, ME 04066-0179
PO BOX 180, ORRS ISLAND, ME 04066-0180
PO BOX 181, ORRS ISLAND, ME 04066-0181
PO BOX 182, ORRS ISLAND, ME 04066-0182
PO BOX 183, ORRS ISLAND, ME 04066-0183
PO BOX 184, ORRS ISLAND, ME 04066-0184
PO BOX 185, ORRS ISLAND, ME 04066-0185
PO BOX 186, ORRS ISLAND, ME 04066-0186
PO BOX 187, ORRS ISLAND, ME 04066-0187
PO BOX 188, ORRS ISLAND, ME 04066-0188
PO BOX 189, ORRS ISLAND, ME 04066-0189
PO BOX 190, ORRS ISLAND, ME 04066-0190
PO BOX 191, ORRS ISLAND, ME 04066-0191
PO BOX 192, ORRS ISLAND, ME 04066-0192
PO BOX 193, ORRS ISLAND, ME 04066-0193
PO BOX 194, ORRS ISLAND, ME 04066-0194
PO BOX 195, ORRS ISLAND, ME 04066-0195
PO BOX 196, ORRS ISLAND, ME 04066-0196
PO BOX 197, ORRS ISLAND, ME 04066-0197
PO BOX 198, ORRS ISLAND, ME 04066-0198
PO BOX 199, ORRS ISLAND, ME 04066-0199
PO BOX 200, ORRS ISLAND, ME 04066-0200
PO BOX 201, ORRS ISLAND, ME 04066-0201
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