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, HILLSDALE, NJ 07642-0001
PO BOX 2, HILLSDALE, NJ 07642-0002
PO BOX 3, HILLSDALE, NJ 07642-0003
PO BOX 4, HILLSDALE, NJ 07642-0004
PO BOX 5, HILLSDALE, NJ 07642-0005
PO BOX 6, HILLSDALE, NJ 07642-0006
PO BOX 7, HILLSDALE, NJ 07642-0007
PO BOX 8, HILLSDALE, NJ 07642-0008
PO BOX 9, HILLSDALE, NJ 07642-0009
PO BOX 10, HILLSDALE, NJ 07642-0010
PO BOX 11, HILLSDALE, NJ 07642-0011
PO BOX 12, HILLSDALE, NJ 07642-0012
PO BOX 13, HILLSDALE, NJ 07642-0013
PO BOX 14, HILLSDALE, NJ 07642-0014
PO BOX 15, HILLSDALE, NJ 07642-0015
PO BOX 16, HILLSDALE, NJ 07642-0016
PO BOX 17, HILLSDALE, NJ 07642-0017
PO BOX 18, HILLSDALE, NJ 07642-0018
PO BOX 19, HILLSDALE, NJ 07642-0019
PO BOX 20, HILLSDALE, NJ 07642-0020
PO BOX 21, HILLSDALE, NJ 07642-0021
PO BOX 22, HILLSDALE, NJ 07642-0022
PO BOX 23, HILLSDALE, NJ 07642-0023
PO BOX 24, HILLSDALE, NJ 07642-0024
PO BOX 25, HILLSDALE, NJ 07642-0025
PO BOX 26, HILLSDALE, NJ 07642-0026
PO BOX 27, HILLSDALE, NJ 07642-0027
PO BOX 28, HILLSDALE, NJ 07642-0028
PO BOX 29, HILLSDALE, NJ 07642-0029
PO BOX 30, HILLSDALE, NJ 07642-0030
PO BOX 31, HILLSDALE, NJ 07642-0031
PO BOX 32, HILLSDALE, NJ 07642-0032
PO BOX 33, HILLSDALE, NJ 07642-0033
PO BOX 34, HILLSDALE, NJ 07642-0034
PO BOX 35, HILLSDALE, NJ 07642-0035
PO BOX 36, HILLSDALE, NJ 07642-0036
PO BOX 37, HILLSDALE, NJ 07642-0037
PO BOX 38, HILLSDALE, NJ 07642-0038
PO BOX 39, HILLSDALE, NJ 07642-0039
PO BOX 40, HILLSDALE, NJ 07642-0040
PO BOX 41, HILLSDALE, NJ 07642-0041
PO BOX 42, HILLSDALE, NJ 07642-0042
PO BOX 43, HILLSDALE, NJ 07642-0043
PO BOX 44, HILLSDALE, NJ 07642-0044
PO BOX 45, HILLSDALE, NJ 07642-0045
PO BOX 46, HILLSDALE, NJ 07642-0046
PO BOX 47, HILLSDALE, NJ 07642-0047
PO BOX 48, HILLSDALE, NJ 07642-0048
PO BOX 49, HILLSDALE, NJ 07642-0049
PO BOX 50, HILLSDALE, NJ 07642-0050
PO BOX 51, HILLSDALE, NJ 07642-0051
PO BOX 52, HILLSDALE, NJ 07642-0052
PO BOX 53, HILLSDALE, NJ 07642-0053
PO BOX 54, HILLSDALE, NJ 07642-0054
PO BOX 55, HILLSDALE, NJ 07642-0055
PO BOX 56, HILLSDALE, NJ 07642-0056
PO BOX 57, HILLSDALE, NJ 07642-0057
PO BOX 58, HILLSDALE, NJ 07642-0058
PO BOX 59, HILLSDALE, NJ 07642-0059
PO BOX 60, HILLSDALE, NJ 07642-0060
PO BOX 61, HILLSDALE, NJ 07642-0061
PO BOX 62, HILLSDALE, NJ 07642-0062
PO BOX 63, HILLSDALE, NJ 07642-0063
PO BOX 64, HILLSDALE, NJ 07642-0064
PO BOX 65, HILLSDALE, NJ 07642-0065
PO BOX 66, HILLSDALE, NJ 07642-0066
PO BOX 67, HILLSDALE, NJ 07642-0067
PO BOX 68, HILLSDALE, NJ 07642-0068
PO BOX 69, HILLSDALE, NJ 07642-0069
PO BOX 70, HILLSDALE, NJ 07642-0070
PO BOX 71, HILLSDALE, NJ 07642-0071
PO BOX 72, HILLSDALE, NJ 07642-0072
PO BOX 73, HILLSDALE, NJ 07642-0073
PO BOX 74, HILLSDALE, NJ 07642-0074
PO BOX 75, HILLSDALE, NJ 07642-0075
PO BOX 76, HILLSDALE, NJ 07642-0076
PO BOX 77, HILLSDALE, NJ 07642-0077
PO BOX 78, HILLSDALE, NJ 07642-0078
PO BOX 79, HILLSDALE, NJ 07642-0079
PO BOX 80, HILLSDALE, NJ 07642-0080
PO BOX 81, HILLSDALE, NJ 07642-0081
PO BOX 82, HILLSDALE, NJ 07642-0082
PO BOX 83, HILLSDALE, NJ 07642-0083
PO BOX 84, HILLSDALE, NJ 07642-0084
PO BOX 85, HILLSDALE, NJ 07642-0085
PO BOX 86, HILLSDALE, NJ 07642-0086
PO BOX 87, HILLSDALE, NJ 07642-0087
PO BOX 88, HILLSDALE, NJ 07642-0088
PO BOX 89, HILLSDALE, NJ 07642-0089
PO BOX 90, HILLSDALE, NJ 07642-0090
PO BOX 91, HILLSDALE, NJ 07642-0091
PO BOX 92, HILLSDALE, NJ 07642-0092
PO BOX 93, HILLSDALE, NJ 07642-0093
PO BOX 94, HILLSDALE, NJ 07642-0094
PO BOX 95, HILLSDALE, NJ 07642-0095
PO BOX 96, HILLSDALE, NJ 07642-0096
PO BOX 97, HILLSDALE, NJ 07642-0097
PO BOX 98, HILLSDALE, NJ 07642-0098
PO BOX 99, HILLSDALE, NJ 07642-0099
PO BOX 100, HILLSDALE, NJ 07642-0100
PO BOX 101, HILLSDALE, NJ 07642-0101
PO BOX 102, HILLSDALE, NJ 07642-0102
PO BOX 103, HILLSDALE, NJ 07642-0103
PO BOX 104, HILLSDALE, NJ 07642-0104
PO BOX 105, HILLSDALE, NJ 07642-0105
PO BOX 106, HILLSDALE, NJ 07642-0106
PO BOX 107, HILLSDALE, NJ 07642-0107
PO BOX 108, HILLSDALE, NJ 07642-0108
PO BOX 109, HILLSDALE, NJ 07642-0109
PO BOX 110, HILLSDALE, NJ 07642-0110
PO BOX 111, HILLSDALE, NJ 07642-0111
PO BOX 112, HILLSDALE, NJ 07642-0112
PO BOX 113, HILLSDALE, NJ 07642-0113
PO BOX 114, HILLSDALE, NJ 07642-0114
PO BOX 115, HILLSDALE, NJ 07642-0115
PO BOX 116, HILLSDALE, NJ 07642-0116
PO BOX 117, HILLSDALE, NJ 07642-0117
PO BOX 118, HILLSDALE, NJ 07642-0118
PO BOX 119, HILLSDALE, NJ 07642-0119
PO BOX 120, HILLSDALE, NJ 07642-0120
PO BOX 121, HILLSDALE, NJ 07642-0121
PO BOX 122, HILLSDALE, NJ 07642-0122
PO BOX 123, HILLSDALE, NJ 07642-0123
PO BOX 124, HILLSDALE, NJ 07642-0124
PO BOX 125, HILLSDALE, NJ 07642-0125
PO BOX 126, HILLSDALE, NJ 07642-0126
PO BOX 127, HILLSDALE, NJ 07642-0127
PO BOX 128, HILLSDALE, NJ 07642-0128
PO BOX 129, HILLSDALE, NJ 07642-0129
PO BOX 130, HILLSDALE, NJ 07642-0130
PO BOX 131, HILLSDALE, NJ 07642-0131
PO BOX 132, HILLSDALE, NJ 07642-0132
PO BOX 133, HILLSDALE, NJ 07642-0133
PO BOX 134, HILLSDALE, NJ 07642-0134
PO BOX 135, HILLSDALE, NJ 07642-0135
PO BOX 136, HILLSDALE, NJ 07642-0136
PO BOX 137, HILLSDALE, NJ 07642-0137
PO BOX 138, HILLSDALE, NJ 07642-0138
PO BOX 139, HILLSDALE, NJ 07642-0139
PO BOX 140, HILLSDALE, NJ 07642-0140
PO BOX 141, HILLSDALE, NJ 07642-0141
PO BOX 142, HILLSDALE, NJ 07642-0142
PO BOX 143, HILLSDALE, NJ 07642-0143
PO BOX 144, HILLSDALE, NJ 07642-0144
PO BOX 145, HILLSDALE, NJ 07642-0145
PO BOX 146, HILLSDALE, NJ 07642-0146
PO BOX 147, HILLSDALE, NJ 07642-0147
PO BOX 148, HILLSDALE, NJ 07642-0148
PO BOX 149, HILLSDALE, NJ 07642-0149
PO BOX 150, HILLSDALE, NJ 07642-0150
PO BOX 151, HILLSDALE, NJ 07642-0151
PO BOX 152, HILLSDALE, NJ 07642-0152
PO BOX 153, HILLSDALE, NJ 07642-0153
PO BOX 154, HILLSDALE, NJ 07642-0154
PO BOX 155, HILLSDALE, NJ 07642-0155
PO BOX 156, HILLSDALE, NJ 07642-0156
PO BOX 157, HILLSDALE, NJ 07642-0157
PO BOX 158, HILLSDALE, NJ 07642-0158
PO BOX 159, HILLSDALE, NJ 07642-0159
PO BOX 160, HILLSDALE, NJ 07642-0160
PO BOX 161, HILLSDALE, NJ 07642-0161
PO BOX 162, HILLSDALE, NJ 07642-0162
PO BOX 163, HILLSDALE, NJ 07642-0163
PO BOX 164, HILLSDALE, NJ 07642-0164
PO BOX 165, HILLSDALE, NJ 07642-0165
PO BOX 166, HILLSDALE, NJ 07642-0166
PO BOX 167, HILLSDALE, NJ 07642-0167
PO BOX 168, HILLSDALE, NJ 07642-0168
PO BOX 169, HILLSDALE, NJ 07642-0169
PO BOX 170, HILLSDALE, NJ 07642-0170
PO BOX 171, HILLSDALE, NJ 07642-0171
PO BOX 172, HILLSDALE, NJ 07642-0172
PO BOX 173, HILLSDALE, NJ 07642-0173
PO BOX 174, HILLSDALE, NJ 07642-0174
PO BOX 175, HILLSDALE, NJ 07642-0175
PO BOX 176, HILLSDALE, NJ 07642-0176
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