Номер на PO BOX може да бъде по-малък или по-голям от четири цифри. За пощенските кутии общото правило е, че всяка кутия има свой собствен ZIP + 4 код.
Последната четирицифрена често е една от следните:
1. Нула плюс последните три цифри от номера на кутията (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. Последните четири цифри от номера на кутията (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. Ако номерът на кутията е по-малък от четири цифри, достатъчно нули, добавени към предната част на номера на кутията, за да се получи четирицифрено число(eg. PO BOX 1, Shreveport LA 71161-0001).
Няма обаче единно правило, пощенският код плюс четири е само за справка, ZIP + 4 кодът трябва да се търси индивидуално за всяко поле в официалния уебсайт на USPS.
PO BOX 1, HARRISON, NJ 07029-0001
PO BOX 2, HARRISON, NJ 07029-0002
PO BOX 3, HARRISON, NJ 07029-0003
PO BOX 4, HARRISON, NJ 07029-0004
PO BOX 5, HARRISON, NJ 07029-0005
PO BOX 6, HARRISON, NJ 07029-0006
PO BOX 7, HARRISON, NJ 07029-0007
PO BOX 8, HARRISON, NJ 07029-0008
PO BOX 9, HARRISON, NJ 07029-0009
PO BOX 10, HARRISON, NJ 07029-0010
PO BOX 11, HARRISON, NJ 07029-0011
PO BOX 12, HARRISON, NJ 07029-0012
PO BOX 13, HARRISON, NJ 07029-0013
PO BOX 14, HARRISON, NJ 07029-0014
PO BOX 15, HARRISON, NJ 07029-0015
PO BOX 16, HARRISON, NJ 07029-0016
PO BOX 17, HARRISON, NJ 07029-0017
PO BOX 18, HARRISON, NJ 07029-0018
PO BOX 19, HARRISON, NJ 07029-0019
PO BOX 20, HARRISON, NJ 07029-0020
PO BOX 21, HARRISON, NJ 07029-0021
PO BOX 22, HARRISON, NJ 07029-0022
PO BOX 23, HARRISON, NJ 07029-0023
PO BOX 24, HARRISON, NJ 07029-0024
PO BOX 25, HARRISON, NJ 07029-0025
PO BOX 26, HARRISON, NJ 07029-0026
PO BOX 27, HARRISON, NJ 07029-0027
PO BOX 28, HARRISON, NJ 07029-0028
PO BOX 29, HARRISON, NJ 07029-0029
PO BOX 30, HARRISON, NJ 07029-0030
PO BOX 31, HARRISON, NJ 07029-0031
PO BOX 32, HARRISON, NJ 07029-0032
PO BOX 33, HARRISON, NJ 07029-0033
PO BOX 34, HARRISON, NJ 07029-0034
PO BOX 35, HARRISON, NJ 07029-0035
PO BOX 36, HARRISON, NJ 07029-0036
PO BOX 37, HARRISON, NJ 07029-0037
PO BOX 38, HARRISON, NJ 07029-0038
PO BOX 39, HARRISON, NJ 07029-0039
PO BOX 40, HARRISON, NJ 07029-0040
PO BOX 41, HARRISON, NJ 07029-0041
PO BOX 42, HARRISON, NJ 07029-0042
PO BOX 43, HARRISON, NJ 07029-0043
PO BOX 44, HARRISON, NJ 07029-0044
PO BOX 45, HARRISON, NJ 07029-0045
PO BOX 46, HARRISON, NJ 07029-0046
PO BOX 47, HARRISON, NJ 07029-0047
PO BOX 48, HARRISON, NJ 07029-0048
PO BOX 49, HARRISON, NJ 07029-0049
PO BOX 50, HARRISON, NJ 07029-0050
PO BOX 51, HARRISON, NJ 07029-0051
PO BOX 52, HARRISON, NJ 07029-0052
PO BOX 53, HARRISON, NJ 07029-0053
PO BOX 54, HARRISON, NJ 07029-0054
PO BOX 55, HARRISON, NJ 07029-0055
PO BOX 56, HARRISON, NJ 07029-0056
PO BOX 57, HARRISON, NJ 07029-0057
PO BOX 58, HARRISON, NJ 07029-0058
PO BOX 59, HARRISON, NJ 07029-0059
PO BOX 60, HARRISON, NJ 07029-0060
PO BOX 61, HARRISON, NJ 07029-0061
PO BOX 62, HARRISON, NJ 07029-0062
PO BOX 63, HARRISON, NJ 07029-0063
PO BOX 64, HARRISON, NJ 07029-0064
PO BOX 65, HARRISON, NJ 07029-0065
PO BOX 66, HARRISON, NJ 07029-0066
PO BOX 67, HARRISON, NJ 07029-0067
PO BOX 68, HARRISON, NJ 07029-0068
PO BOX 69, HARRISON, NJ 07029-0069
PO BOX 70, HARRISON, NJ 07029-0070
PO BOX 71, HARRISON, NJ 07029-0071
PO BOX 72, HARRISON, NJ 07029-0072
PO BOX 73, HARRISON, NJ 07029-0073
PO BOX 74, HARRISON, NJ 07029-0074
PO BOX 75, HARRISON, NJ 07029-0075
PO BOX 76, HARRISON, NJ 07029-0076
PO BOX 77, HARRISON, NJ 07029-0077
PO BOX 78, HARRISON, NJ 07029-0078
PO BOX 79, HARRISON, NJ 07029-0079
PO BOX 80, HARRISON, NJ 07029-0080
PO BOX 81, HARRISON, NJ 07029-0081
PO BOX 82, HARRISON, NJ 07029-0082
PO BOX 83, HARRISON, NJ 07029-0083
PO BOX 84, HARRISON, NJ 07029-0084
PO BOX 85, HARRISON, NJ 07029-0085
PO BOX 86, HARRISON, NJ 07029-0086
PO BOX 87, HARRISON, NJ 07029-0087
PO BOX 88, HARRISON, NJ 07029-0088
PO BOX 89, HARRISON, NJ 07029-0089
PO BOX 90, HARRISON, NJ 07029-0090
PO BOX 91, HARRISON, NJ 07029-0091
PO BOX 92, HARRISON, NJ 07029-0092
PO BOX 93, HARRISON, NJ 07029-0093
PO BOX 94, HARRISON, NJ 07029-0094
PO BOX 95, HARRISON, NJ 07029-0095
PO BOX 96, HARRISON, NJ 07029-0096
PO BOX 97, HARRISON, NJ 07029-0097
PO BOX 98, HARRISON, NJ 07029-0098
PO BOX 99, HARRISON, NJ 07029-0099
PO BOX 100, HARRISON, NJ 07029-0100
PO BOX 101, HARRISON, NJ 07029-0101
PO BOX 102, HARRISON, NJ 07029-0102
PO BOX 103, HARRISON, NJ 07029-0103
PO BOX 104, HARRISON, NJ 07029-0104
PO BOX 105, HARRISON, NJ 07029-0105
PO BOX 106, HARRISON, NJ 07029-0106
PO BOX 107, HARRISON, NJ 07029-0107
PO BOX 108, HARRISON, NJ 07029-0108
PO BOX 109, HARRISON, NJ 07029-0109
PO BOX 110, HARRISON, NJ 07029-0110
PO BOX 111, HARRISON, NJ 07029-0111
PO BOX 112, HARRISON, NJ 07029-0112
PO BOX 113, HARRISON, NJ 07029-0113
PO BOX 114, HARRISON, NJ 07029-0114
PO BOX 115, HARRISON, NJ 07029-0115
PO BOX 116, HARRISON, NJ 07029-0116
PO BOX 117, HARRISON, NJ 07029-0117
PO BOX 118, HARRISON, NJ 07029-0118
PO BOX 119, HARRISON, NJ 07029-0119
PO BOX 120, HARRISON, NJ 07029-0120
PO BOX 121, HARRISON, NJ 07029-0121
PO BOX 122, HARRISON, NJ 07029-0122
PO BOX 123, HARRISON, NJ 07029-0123
PO BOX 124, HARRISON, NJ 07029-0124
PO BOX 125, HARRISON, NJ 07029-0125
PO BOX 126, HARRISON, NJ 07029-0126
PO BOX 127, HARRISON, NJ 07029-0127
PO BOX 128, HARRISON, NJ 07029-0128
PO BOX 129, HARRISON, NJ 07029-0129
PO BOX 130, HARRISON, NJ 07029-0130
PO BOX 131, HARRISON, NJ 07029-0131
PO BOX 132, HARRISON, NJ 07029-0132
PO BOX 133, HARRISON, NJ 07029-0133
PO BOX 134, HARRISON, NJ 07029-0134
PO BOX 135, HARRISON, NJ 07029-0135
PO BOX 136, HARRISON, NJ 07029-0136
PO BOX 137, HARRISON, NJ 07029-0137
PO BOX 138, HARRISON, NJ 07029-0138
PO BOX 139, HARRISON, NJ 07029-0139
PO BOX 140, HARRISON, NJ 07029-0140
PO BOX 141, HARRISON, NJ 07029-0141
PO BOX 142, HARRISON, NJ 07029-0142
PO BOX 143, HARRISON, NJ 07029-0143
PO BOX 144, HARRISON, NJ 07029-0144
PO BOX 145, HARRISON, NJ 07029-0145
PO BOX 146, HARRISON, NJ 07029-0146
PO BOX 147, HARRISON, NJ 07029-0147
PO BOX 148, HARRISON, NJ 07029-0148
PO BOX 149, HARRISON, NJ 07029-0149
PO BOX 150, HARRISON, NJ 07029-0150
PO BOX 151, HARRISON, NJ 07029-0151
PO BOX 152, HARRISON, NJ 07029-0152
PO BOX 153, HARRISON, NJ 07029-0153
PO BOX 154, HARRISON, NJ 07029-0154
PO BOX 155, HARRISON, NJ 07029-0155
PO BOX 156, HARRISON, NJ 07029-0156
PO BOX 157, HARRISON, NJ 07029-0157
PO BOX 158, HARRISON, NJ 07029-0158
PO BOX 159, HARRISON, NJ 07029-0159
PO BOX 160, HARRISON, NJ 07029-0160
PO BOX 161, HARRISON, NJ 07029-0161
PO BOX 162, HARRISON, NJ 07029-0162
PO BOX 163, HARRISON, NJ 07029-0163
PO BOX 164, HARRISON, NJ 07029-0164
PO BOX 165, HARRISON, NJ 07029-0165
PO BOX 166, HARRISON, NJ 07029-0166
PO BOX 167, HARRISON, NJ 07029-0167
PO BOX 168, HARRISON, NJ 07029-0168
PO BOX 169, HARRISON, NJ 07029-0169
PO BOX 170, HARRISON, NJ 07029-0170
PO BOX 171, HARRISON, NJ 07029-0171
PO BOX 172, HARRISON, NJ 07029-0172
PO BOX 173, HARRISON, NJ 07029-0173
PO BOX 174, HARRISON, NJ 07029-0174
PO BOX 175, HARRISON, NJ 07029-0175
PO BOX 176, HARRISON, NJ 07029-0176
PO BOX 177, HARRISON, NJ 07029-0177
PO BOX 178, HARRISON, NJ 07029-0178
PO BOX 179, HARRISON, NJ 07029-0179
PO BOX 180, HARRISON, NJ 07029-0180
PO BOX 181, HARRISON, NJ 07029-0181
PO BOX 182, HARRISON, NJ 07029-0182
PO BOX 183, HARRISON, NJ 07029-0183
PO BOX 184, HARRISON, NJ 07029-0184
PO BOX 185, HARRISON, NJ 07029-0185
PO BOX 186, HARRISON, NJ 07029-0186
PO BOX 187, HARRISON, NJ 07029-0187
PO BOX 188, HARRISON, NJ 07029-0188
PO BOX 189, HARRISON, NJ 07029-0189
PO BOX 190, HARRISON, NJ 07029-0190
PO BOX 191, HARRISON, NJ 07029-0191
PO BOX 192, HARRISON, NJ 07029-0192
PO BOX 193, HARRISON, NJ 07029-0193
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