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, WESTFIELD, NJ 07091-0001
PO BOX 2, WESTFIELD, NJ 07091-0002
PO BOX 3, WESTFIELD, NJ 07091-0003
PO BOX 4, WESTFIELD, NJ 07091-0004
PO BOX 5, WESTFIELD, NJ 07091-0005
PO BOX 6, WESTFIELD, NJ 07091-0006
PO BOX 7, WESTFIELD, NJ 07091-0007
PO BOX 8, WESTFIELD, NJ 07091-0008
PO BOX 9, WESTFIELD, NJ 07091-0009
PO BOX 10, WESTFIELD, NJ 07091-0010
PO BOX 11, WESTFIELD, NJ 07091-0011
PO BOX 12, WESTFIELD, NJ 07091-0012
PO BOX 13, WESTFIELD, NJ 07091-0013
PO BOX 14, WESTFIELD, NJ 07091-0014
PO BOX 15, WESTFIELD, NJ 07091-0015
PO BOX 16, WESTFIELD, NJ 07091-0016
PO BOX 17, WESTFIELD, NJ 07091-0017
PO BOX 18, WESTFIELD, NJ 07091-0018
PO BOX 19, WESTFIELD, NJ 07091-0019
PO BOX 20, WESTFIELD, NJ 07091-0020
PO BOX 21, WESTFIELD, NJ 07091-0021
PO BOX 22, WESTFIELD, NJ 07091-0022
PO BOX 23, WESTFIELD, NJ 07091-0023
PO BOX 24, WESTFIELD, NJ 07091-0024
PO BOX 25, WESTFIELD, NJ 07091-0025
PO BOX 26, WESTFIELD, NJ 07091-0026
PO BOX 27, WESTFIELD, NJ 07091-0027
PO BOX 28, WESTFIELD, NJ 07091-0028
PO BOX 29, WESTFIELD, NJ 07091-0029
PO BOX 30, WESTFIELD, NJ 07091-0030
PO BOX 31, WESTFIELD, NJ 07091-0031
PO BOX 32, WESTFIELD, NJ 07091-0032
PO BOX 33, WESTFIELD, NJ 07091-0033
PO BOX 34, WESTFIELD, NJ 07091-0034
PO BOX 35, WESTFIELD, NJ 07091-0035
PO BOX 36, WESTFIELD, NJ 07091-0036
PO BOX 37, WESTFIELD, NJ 07091-0037
PO BOX 38, WESTFIELD, NJ 07091-0038
PO BOX 39, WESTFIELD, NJ 07091-0039
PO BOX 40, WESTFIELD, NJ 07091-0040
PO BOX 41, WESTFIELD, NJ 07091-0041
PO BOX 42, WESTFIELD, NJ 07091-0042
PO BOX 43, WESTFIELD, NJ 07091-0043
PO BOX 44, WESTFIELD, NJ 07091-0044
PO BOX 45, WESTFIELD, NJ 07091-0045
PO BOX 46, WESTFIELD, NJ 07091-0046
PO BOX 47, WESTFIELD, NJ 07091-0047
PO BOX 48, WESTFIELD, NJ 07091-0048
PO BOX 49, WESTFIELD, NJ 07091-0049
PO BOX 50, WESTFIELD, NJ 07091-0050
PO BOX 51, WESTFIELD, NJ 07091-0051
PO BOX 52, WESTFIELD, NJ 07091-0052
PO BOX 53, WESTFIELD, NJ 07091-0053
PO BOX 54, WESTFIELD, NJ 07091-0054
PO BOX 55, WESTFIELD, NJ 07091-0055
PO BOX 56, WESTFIELD, NJ 07091-0056
PO BOX 57, WESTFIELD, NJ 07091-0057
PO BOX 58, WESTFIELD, NJ 07091-0058
PO BOX 59, WESTFIELD, NJ 07091-0059
PO BOX 60, WESTFIELD, NJ 07091-0060
PO BOX 61, WESTFIELD, NJ 07091-0061
PO BOX 62, WESTFIELD, NJ 07091-0062
PO BOX 63, WESTFIELD, NJ 07091-0063
PO BOX 64, WESTFIELD, NJ 07091-0064
PO BOX 65, WESTFIELD, NJ 07091-0065
PO BOX 66, WESTFIELD, NJ 07091-0066
PO BOX 67, WESTFIELD, NJ 07091-0067
PO BOX 68, WESTFIELD, NJ 07091-0068
PO BOX 69, WESTFIELD, NJ 07091-0069
PO BOX 70, WESTFIELD, NJ 07091-0070
PO BOX 71, WESTFIELD, NJ 07091-0071
PO BOX 72, WESTFIELD, NJ 07091-0072
PO BOX 73, WESTFIELD, NJ 07091-0073
PO BOX 74, WESTFIELD, NJ 07091-0074
PO BOX 75, WESTFIELD, NJ 07091-0075
PO BOX 76, WESTFIELD, NJ 07091-0076
PO BOX 77, WESTFIELD, NJ 07091-0077
PO BOX 78, WESTFIELD, NJ 07091-0078
PO BOX 79, WESTFIELD, NJ 07091-0079
PO BOX 80, WESTFIELD, NJ 07091-0080
PO BOX 81, WESTFIELD, NJ 07091-0081
PO BOX 82, WESTFIELD, NJ 07091-0082
PO BOX 83, WESTFIELD, NJ 07091-0083
PO BOX 84, WESTFIELD, NJ 07091-0084
PO BOX 85, WESTFIELD, NJ 07091-0085
PO BOX 86, WESTFIELD, NJ 07091-0086
PO BOX 87, WESTFIELD, NJ 07091-0087
PO BOX 88, WESTFIELD, NJ 07091-0088
PO BOX 89, WESTFIELD, NJ 07091-0089
PO BOX 90, WESTFIELD, NJ 07091-0090
PO BOX 91, WESTFIELD, NJ 07091-0091
PO BOX 92, WESTFIELD, NJ 07091-0092
PO BOX 93, WESTFIELD, NJ 07091-0093
PO BOX 94, WESTFIELD, NJ 07091-0094
PO BOX 95, WESTFIELD, NJ 07091-0095
PO BOX 96, WESTFIELD, NJ 07091-0096
PO BOX 97, WESTFIELD, NJ 07091-0097
PO BOX 98, WESTFIELD, NJ 07091-0098
PO BOX 99, WESTFIELD, NJ 07091-0099
PO BOX 100, WESTFIELD, NJ 07091-0100
PO BOX 101, WESTFIELD, NJ 07091-0101
PO BOX 102, WESTFIELD, NJ 07091-0102
PO BOX 103, WESTFIELD, NJ 07091-0103
PO BOX 104, WESTFIELD, NJ 07091-0104
PO BOX 105, WESTFIELD, NJ 07091-0105
PO BOX 106, WESTFIELD, NJ 07091-0106
PO BOX 107, WESTFIELD, NJ 07091-0107
PO BOX 108, WESTFIELD, NJ 07091-0108
PO BOX 109, WESTFIELD, NJ 07091-0109
PO BOX 110, WESTFIELD, NJ 07091-0110
PO BOX 111, WESTFIELD, NJ 07091-0111
PO BOX 112, WESTFIELD, NJ 07091-0112
PO BOX 113, WESTFIELD, NJ 07091-0113
PO BOX 114, WESTFIELD, NJ 07091-0114
PO BOX 115, WESTFIELD, NJ 07091-0115
PO BOX 116, WESTFIELD, NJ 07091-0116
PO BOX 117, WESTFIELD, NJ 07091-0117
PO BOX 118, WESTFIELD, NJ 07091-0118
PO BOX 119, WESTFIELD, NJ 07091-0119
PO BOX 120, WESTFIELD, NJ 07091-0120
PO BOX 121, WESTFIELD, NJ 07091-0121
PO BOX 122, WESTFIELD, NJ 07091-0122
PO BOX 123, WESTFIELD, NJ 07091-0123
PO BOX 124, WESTFIELD, NJ 07091-0124
PO BOX 125, WESTFIELD, NJ 07091-0125
PO BOX 126, WESTFIELD, NJ 07091-0126
PO BOX 127, WESTFIELD, NJ 07091-0127
PO BOX 128, WESTFIELD, NJ 07091-0128
PO BOX 129, WESTFIELD, NJ 07091-0129
PO BOX 130, WESTFIELD, NJ 07091-0130
PO BOX 131, WESTFIELD, NJ 07091-0131
PO BOX 132, WESTFIELD, NJ 07091-0132
PO BOX 133, WESTFIELD, NJ 07091-0133
PO BOX 134, WESTFIELD, NJ 07091-0134
PO BOX 135, WESTFIELD, NJ 07091-0135
PO BOX 136, WESTFIELD, NJ 07091-0136
PO BOX 137, WESTFIELD, NJ 07091-0137
PO BOX 138, WESTFIELD, NJ 07091-0138
PO BOX 139, WESTFIELD, NJ 07091-0139
PO BOX 140, WESTFIELD, NJ 07091-0140
PO BOX 141, WESTFIELD, NJ 07091-0141
PO BOX 142, WESTFIELD, NJ 07091-0142
PO BOX 143, WESTFIELD, NJ 07091-0143
PO BOX 144, WESTFIELD, NJ 07091-0144
PO BOX 145, WESTFIELD, NJ 07091-0145
PO BOX 146, WESTFIELD, NJ 07091-0146
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