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, ANDOVER, NJ 07821-0001
PO BOX 2, ANDOVER, NJ 07821-0002
PO BOX 3, ANDOVER, NJ 07821-0003
PO BOX 4, ANDOVER, NJ 07821-0004
PO BOX 5, ANDOVER, NJ 07821-0005
PO BOX 6, ANDOVER, NJ 07821-0006
PO BOX 7, ANDOVER, NJ 07821-0007
PO BOX 8, ANDOVER, NJ 07821-0008
PO BOX 9, ANDOVER, NJ 07821-0009
PO BOX 10, ANDOVER, NJ 07821-0010
PO BOX 11, ANDOVER, NJ 07821-0011
PO BOX 12, ANDOVER, NJ 07821-0012
PO BOX 13, ANDOVER, NJ 07821-0013
PO BOX 14, ANDOVER, NJ 07821-0014
PO BOX 15, ANDOVER, NJ 07821-0015
PO BOX 16, ANDOVER, NJ 07821-0016
PO BOX 17, ANDOVER, NJ 07821-0017
PO BOX 18, ANDOVER, NJ 07821-0018
PO BOX 19, ANDOVER, NJ 07821-0019
PO BOX 20, ANDOVER, NJ 07821-0020
PO BOX 21, ANDOVER, NJ 07821-0021
PO BOX 22, ANDOVER, NJ 07821-0022
PO BOX 23, ANDOVER, NJ 07821-0023
PO BOX 24, ANDOVER, NJ 07821-0024
PO BOX 25, ANDOVER, NJ 07821-0025
PO BOX 26, ANDOVER, NJ 07821-0026
PO BOX 27, ANDOVER, NJ 07821-0027
PO BOX 28, ANDOVER, NJ 07821-0028
PO BOX 29, ANDOVER, NJ 07821-0029
PO BOX 30, ANDOVER, NJ 07821-0030
PO BOX 31, ANDOVER, NJ 07821-0031
PO BOX 32, ANDOVER, NJ 07821-0032
PO BOX 33, ANDOVER, NJ 07821-0033
PO BOX 34, ANDOVER, NJ 07821-0034
PO BOX 35, ANDOVER, NJ 07821-0035
PO BOX 36, ANDOVER, NJ 07821-0036
PO BOX 37, ANDOVER, NJ 07821-0037
PO BOX 38, ANDOVER, NJ 07821-0038
PO BOX 39, ANDOVER, NJ 07821-0039
PO BOX 40, ANDOVER, NJ 07821-0040
PO BOX 41, ANDOVER, NJ 07821-0041
PO BOX 42, ANDOVER, NJ 07821-0042
PO BOX 43, ANDOVER, NJ 07821-0043
PO BOX 44, ANDOVER, NJ 07821-0044
PO BOX 45, ANDOVER, NJ 07821-0045
PO BOX 46, ANDOVER, NJ 07821-0046
PO BOX 47, ANDOVER, NJ 07821-0047
PO BOX 48, ANDOVER, NJ 07821-0048
PO BOX 49, ANDOVER, NJ 07821-0049
PO BOX 50, ANDOVER, NJ 07821-0050
PO BOX 51, ANDOVER, NJ 07821-0051
PO BOX 52, ANDOVER, NJ 07821-0052
PO BOX 53, ANDOVER, NJ 07821-0053
PO BOX 54, ANDOVER, NJ 07821-0054
PO BOX 55, ANDOVER, NJ 07821-0055
PO BOX 56, ANDOVER, NJ 07821-0056
PO BOX 57, ANDOVER, NJ 07821-0057
PO BOX 58, ANDOVER, NJ 07821-0058
PO BOX 59, ANDOVER, NJ 07821-0059
PO BOX 60, ANDOVER, NJ 07821-0060
PO BOX 61, ANDOVER, NJ 07821-0061
PO BOX 62, ANDOVER, NJ 07821-0062
PO BOX 63, ANDOVER, NJ 07821-0063
PO BOX 64, ANDOVER, NJ 07821-0064
PO BOX 65, ANDOVER, NJ 07821-0065
PO BOX 66, ANDOVER, NJ 07821-0066
PO BOX 67, ANDOVER, NJ 07821-0067
PO BOX 68, ANDOVER, NJ 07821-0068
PO BOX 69, ANDOVER, NJ 07821-0069
PO BOX 70, ANDOVER, NJ 07821-0070
PO BOX 71, ANDOVER, NJ 07821-0071
PO BOX 72, ANDOVER, NJ 07821-0072
PO BOX 73, ANDOVER, NJ 07821-0073
PO BOX 74, ANDOVER, NJ 07821-0074
PO BOX 75, ANDOVER, NJ 07821-0075
PO BOX 76, ANDOVER, NJ 07821-0076
PO BOX 77, ANDOVER, NJ 07821-0077
PO BOX 78, ANDOVER, NJ 07821-0078
PO BOX 79, ANDOVER, NJ 07821-0079
PO BOX 80, ANDOVER, NJ 07821-0080
PO BOX 81, ANDOVER, NJ 07821-0081
PO BOX 82, ANDOVER, NJ 07821-0082
PO BOX 83, ANDOVER, NJ 07821-0083
PO BOX 84, ANDOVER, NJ 07821-0084
PO BOX 85, ANDOVER, NJ 07821-0085
PO BOX 86, ANDOVER, NJ 07821-0086
PO BOX 87, ANDOVER, NJ 07821-0087
PO BOX 88, ANDOVER, NJ 07821-0088
PO BOX 89, ANDOVER, NJ 07821-0089
PO BOX 90, ANDOVER, NJ 07821-0090
PO BOX 91, ANDOVER, NJ 07821-0091
PO BOX 92, ANDOVER, NJ 07821-0092
PO BOX 93, ANDOVER, NJ 07821-0093
PO BOX 94, ANDOVER, NJ 07821-0094
PO BOX 95, ANDOVER, NJ 07821-0095
PO BOX 96, ANDOVER, NJ 07821-0096
PO BOX 97, ANDOVER, NJ 07821-0097
PO BOX 98, ANDOVER, NJ 07821-0098
PO BOX 99, ANDOVER, NJ 07821-0099
PO BOX 100, ANDOVER, NJ 07821-0100
PO BOX 101, ANDOVER, NJ 07821-0101
PO BOX 102, ANDOVER, NJ 07821-0102
PO BOX 103, ANDOVER, NJ 07821-0103
PO BOX 104, ANDOVER, NJ 07821-0104
PO BOX 105, ANDOVER, NJ 07821-0105
PO BOX 106, ANDOVER, NJ 07821-0106
PO BOX 107, ANDOVER, NJ 07821-0107
PO BOX 108, ANDOVER, NJ 07821-0108
PO BOX 109, ANDOVER, NJ 07821-0109
PO BOX 110, ANDOVER, NJ 07821-0110
PO BOX 111, ANDOVER, NJ 07821-0111
PO BOX 112, ANDOVER, NJ 07821-0112
PO BOX 113, ANDOVER, NJ 07821-0113
PO BOX 114, ANDOVER, NJ 07821-0114
PO BOX 115, ANDOVER, NJ 07821-0115
PO BOX 116, ANDOVER, NJ 07821-0116
PO BOX 117, ANDOVER, NJ 07821-0117
PO BOX 118, ANDOVER, NJ 07821-0118
PO BOX 119, ANDOVER, NJ 07821-0119
PO BOX 120, ANDOVER, NJ 07821-0120
PO BOX 121, ANDOVER, NJ 07821-0121
PO BOX 122, ANDOVER, NJ 07821-0122
PO BOX 123, ANDOVER, NJ 07821-0123
PO BOX 124, ANDOVER, NJ 07821-0124
PO BOX 125, ANDOVER, NJ 07821-0125
PO BOX 126, ANDOVER, NJ 07821-0126
PO BOX 127, ANDOVER, NJ 07821-0127
PO BOX 128, ANDOVER, NJ 07821-0128
PO BOX 129, ANDOVER, NJ 07821-0129
PO BOX 130, ANDOVER, NJ 07821-0130
PO BOX 131, ANDOVER, NJ 07821-0131
PO BOX 132, ANDOVER, NJ 07821-0132
PO BOX 133, ANDOVER, NJ 07821-0133
PO BOX 134, ANDOVER, NJ 07821-0134
PO BOX 135, ANDOVER, NJ 07821-0135
PO BOX 136, ANDOVER, NJ 07821-0136
PO BOX 137, ANDOVER, NJ 07821-0137
PO BOX 138, ANDOVER, NJ 07821-0138
PO BOX 139, ANDOVER, NJ 07821-0139
PO BOX 140, ANDOVER, NJ 07821-0140
PO BOX 141, ANDOVER, NJ 07821-0141
PO BOX 142, ANDOVER, NJ 07821-0142
PO BOX 143, ANDOVER, NJ 07821-0143
PO BOX 144, ANDOVER, NJ 07821-0144
PO BOX 145, ANDOVER, NJ 07821-0145
PO BOX 146, ANDOVER, NJ 07821-0146
PO BOX 147, ANDOVER, NJ 07821-0147
PO BOX 148, ANDOVER, NJ 07821-0148
PO BOX 149, ANDOVER, NJ 07821-0149
PO BOX 150, ANDOVER, NJ 07821-0150
PO BOX 151, ANDOVER, NJ 07821-0151
PO BOX 152, ANDOVER, NJ 07821-0152
PO BOX 153, ANDOVER, NJ 07821-0153
PO BOX 154, ANDOVER, NJ 07821-0154
PO BOX 155, ANDOVER, NJ 07821-0155
PO BOX 156, ANDOVER, NJ 07821-0156
PO BOX 157, ANDOVER, NJ 07821-0157
PO BOX 158, ANDOVER, NJ 07821-0158
PO BOX 159, ANDOVER, NJ 07821-0159
PO BOX 160, ANDOVER, NJ 07821-0160
PO BOX 161, ANDOVER, NJ 07821-0161
PO BOX 162, ANDOVER, NJ 07821-0162
PO BOX 163, ANDOVER, NJ 07821-0163
PO BOX 164, ANDOVER, NJ 07821-0164
PO BOX 165, ANDOVER, NJ 07821-0165
PO BOX 166, ANDOVER, NJ 07821-0166
PO BOX 167, ANDOVER, NJ 07821-0167
PO BOX 168, ANDOVER, NJ 07821-0168
PO BOX 169, ANDOVER, NJ 07821-0169
PO BOX 170, ANDOVER, NJ 07821-0170
PO BOX 171, ANDOVER, NJ 07821-0171
PO BOX 172, ANDOVER, NJ 07821-0172
PO BOX 173, ANDOVER, NJ 07821-0173
PO BOX 174, ANDOVER, NJ 07821-0174
PO BOX 175, ANDOVER, NJ 07821-0175
PO BOX 176, ANDOVER, NJ 07821-0176
PO BOX 177, ANDOVER, NJ 07821-0177
PO BOX 178, ANDOVER, NJ 07821-0178
PO BOX 179, ANDOVER, NJ 07821-0179
PO BOX 180, ANDOVER, NJ 07821-0180
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