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, SWARTSWOOD, NJ 07877-0001
PO BOX 2, SWARTSWOOD, NJ 07877-0002
PO BOX 3, SWARTSWOOD, NJ 07877-0003
PO BOX 4, SWARTSWOOD, NJ 07877-0004
PO BOX 5, SWARTSWOOD, NJ 07877-0005
PO BOX 6, SWARTSWOOD, NJ 07877-0006
PO BOX 7, SWARTSWOOD, NJ 07877-0007
PO BOX 8, SWARTSWOOD, NJ 07877-0008
PO BOX 9, SWARTSWOOD, NJ 07877-0009
PO BOX 10, SWARTSWOOD, NJ 07877-0010
PO BOX 11, SWARTSWOOD, NJ 07877-0011
PO BOX 12, SWARTSWOOD, NJ 07877-0012
PO BOX 13, SWARTSWOOD, NJ 07877-0013
PO BOX 14, SWARTSWOOD, NJ 07877-0014
PO BOX 15, SWARTSWOOD, NJ 07877-0015
PO BOX 16, SWARTSWOOD, NJ 07877-0016
PO BOX 17, SWARTSWOOD, NJ 07877-0017
PO BOX 18, SWARTSWOOD, NJ 07877-0018
PO BOX 19, SWARTSWOOD, NJ 07877-0019
PO BOX 20, SWARTSWOOD, NJ 07877-0020
PO BOX 21, SWARTSWOOD, NJ 07877-0021
PO BOX 22, SWARTSWOOD, NJ 07877-0022
PO BOX 23, SWARTSWOOD, NJ 07877-0023
PO BOX 24, SWARTSWOOD, NJ 07877-0024
PO BOX 25, SWARTSWOOD, NJ 07877-0025
PO BOX 26, SWARTSWOOD, NJ 07877-0026
PO BOX 27, SWARTSWOOD, NJ 07877-0027
PO BOX 28, SWARTSWOOD, NJ 07877-0028
PO BOX 29, SWARTSWOOD, NJ 07877-0029
PO BOX 30, SWARTSWOOD, NJ 07877-0030
PO BOX 31, SWARTSWOOD, NJ 07877-0031
PO BOX 32, SWARTSWOOD, NJ 07877-0032
PO BOX 33, SWARTSWOOD, NJ 07877-0033
PO BOX 34, SWARTSWOOD, NJ 07877-0034
PO BOX 35, SWARTSWOOD, NJ 07877-0035
PO BOX 36, SWARTSWOOD, NJ 07877-0036
PO BOX 37, SWARTSWOOD, NJ 07877-0037
PO BOX 38, SWARTSWOOD, NJ 07877-0038
PO BOX 39, SWARTSWOOD, NJ 07877-0039
PO BOX 40, SWARTSWOOD, NJ 07877-0040
PO BOX 41, SWARTSWOOD, NJ 07877-0041
PO BOX 42, SWARTSWOOD, NJ 07877-0042
PO BOX 43, SWARTSWOOD, NJ 07877-0043
PO BOX 44, SWARTSWOOD, NJ 07877-0044
PO BOX 45, SWARTSWOOD, NJ 07877-0045
PO BOX 46, SWARTSWOOD, NJ 07877-0046
PO BOX 47, SWARTSWOOD, NJ 07877-0047
PO BOX 48, SWARTSWOOD, NJ 07877-0048
PO BOX 49, SWARTSWOOD, NJ 07877-0049
PO BOX 50, SWARTSWOOD, NJ 07877-0050
PO BOX 51, SWARTSWOOD, NJ 07877-0051
PO BOX 52, SWARTSWOOD, NJ 07877-0052
PO BOX 53, SWARTSWOOD, NJ 07877-0053
PO BOX 54, SWARTSWOOD, NJ 07877-0054
PO BOX 55, SWARTSWOOD, NJ 07877-0055
PO BOX 56, SWARTSWOOD, NJ 07877-0056
PO BOX 57, SWARTSWOOD, NJ 07877-0057
PO BOX 58, SWARTSWOOD, NJ 07877-0058
PO BOX 59, SWARTSWOOD, NJ 07877-0059
PO BOX 60, SWARTSWOOD, NJ 07877-0060
PO BOX 61, SWARTSWOOD, NJ 07877-0061
PO BOX 62, SWARTSWOOD, NJ 07877-0062
PO BOX 63, SWARTSWOOD, NJ 07877-0063
PO BOX 64, SWARTSWOOD, NJ 07877-0064
PO BOX 65, SWARTSWOOD, NJ 07877-0065
PO BOX 66, SWARTSWOOD, NJ 07877-0066
PO BOX 67, SWARTSWOOD, NJ 07877-0067
PO BOX 68, SWARTSWOOD, NJ 07877-0068
PO BOX 69, SWARTSWOOD, NJ 07877-0069
PO BOX 70, SWARTSWOOD, NJ 07877-0070
PO BOX 71, SWARTSWOOD, NJ 07877-0071
PO BOX 72, SWARTSWOOD, NJ 07877-0072
PO BOX 73, SWARTSWOOD, NJ 07877-0073
PO BOX 74, SWARTSWOOD, NJ 07877-0074
PO BOX 75, SWARTSWOOD, NJ 07877-0075
PO BOX 76, SWARTSWOOD, NJ 07877-0076
PO BOX 77, SWARTSWOOD, NJ 07877-0077
PO BOX 78, SWARTSWOOD, NJ 07877-0078
PO BOX 79, SWARTSWOOD, NJ 07877-0079
PO BOX 80, SWARTSWOOD, NJ 07877-0080
PO BOX 81, SWARTSWOOD, NJ 07877-0081
PO BOX 82, SWARTSWOOD, NJ 07877-0082
PO BOX 83, SWARTSWOOD, NJ 07877-0083
PO BOX 84, SWARTSWOOD, NJ 07877-0084
PO BOX 85, SWARTSWOOD, NJ 07877-0085
PO BOX 86, SWARTSWOOD, NJ 07877-0086
PO BOX 87, SWARTSWOOD, NJ 07877-0087
PO BOX 88, SWARTSWOOD, NJ 07877-0088
PO BOX 89, SWARTSWOOD, NJ 07877-0089
PO BOX 90, SWARTSWOOD, NJ 07877-0090
PO BOX 91, SWARTSWOOD, NJ 07877-0091
PO BOX 92, SWARTSWOOD, NJ 07877-0092
PO BOX 93, SWARTSWOOD, NJ 07877-0093
PO BOX 94, SWARTSWOOD, NJ 07877-0094
PO BOX 95, SWARTSWOOD, NJ 07877-0095
PO BOX 96, SWARTSWOOD, NJ 07877-0096
PO BOX 97, SWARTSWOOD, NJ 07877-0097
PO BOX 98, SWARTSWOOD, NJ 07877-0098
PO BOX 99, SWARTSWOOD, NJ 07877-0099
PO BOX 100, SWARTSWOOD, NJ 07877-0100
PO BOX 101, SWARTSWOOD, NJ 07877-0101
PO BOX 102, SWARTSWOOD, NJ 07877-0102
PO BOX 103, SWARTSWOOD, NJ 07877-0103
PO BOX 104, SWARTSWOOD, NJ 07877-0104
PO BOX 105, SWARTSWOOD, NJ 07877-0105
PO BOX 106, SWARTSWOOD, NJ 07877-0106
PO BOX 107, SWARTSWOOD, NJ 07877-0107
PO BOX 108, SWARTSWOOD, NJ 07877-0108
PO BOX 109, SWARTSWOOD, NJ 07877-0109
PO BOX 110, SWARTSWOOD, NJ 07877-0110
PO BOX 111, SWARTSWOOD, NJ 07877-0111
PO BOX 112, SWARTSWOOD, NJ 07877-0112
PO BOX 113, SWARTSWOOD, NJ 07877-0113
PO BOX 114, SWARTSWOOD, NJ 07877-0114
PO BOX 115, SWARTSWOOD, NJ 07877-0115
PO BOX 116, SWARTSWOOD, NJ 07877-0116
PO BOX 117, SWARTSWOOD, NJ 07877-0117
PO BOX 118, SWARTSWOOD, NJ 07877-0118
PO BOX 119, SWARTSWOOD, NJ 07877-0119
PO BOX 120, SWARTSWOOD, NJ 07877-0120
PO BOX 121, SWARTSWOOD, NJ 07877-0121
PO BOX 122, SWARTSWOOD, NJ 07877-0122
PO BOX 123, SWARTSWOOD, NJ 07877-0123
PO BOX 124, SWARTSWOOD, NJ 07877-0124
PO BOX 125, SWARTSWOOD, NJ 07877-0125
PO BOX 126, SWARTSWOOD, NJ 07877-0126
PO BOX 127, SWARTSWOOD, NJ 07877-0127
PO BOX 128, SWARTSWOOD, NJ 07877-0128
PO BOX 129, SWARTSWOOD, NJ 07877-0129
PO BOX 130, SWARTSWOOD, NJ 07877-0130
PO BOX 131, SWARTSWOOD, NJ 07877-0131
PO BOX 132, SWARTSWOOD, NJ 07877-0132
PO BOX 133, SWARTSWOOD, NJ 07877-0133
PO BOX 134, SWARTSWOOD, NJ 07877-0134
PO BOX 135, SWARTSWOOD, NJ 07877-0135
PO BOX 136, SWARTSWOOD, NJ 07877-0136
PO BOX 137, SWARTSWOOD, NJ 07877-0137
PO BOX 138, SWARTSWOOD, NJ 07877-0138
PO BOX 139, SWARTSWOOD, NJ 07877-0139
PO BOX 140, SWARTSWOOD, NJ 07877-0140
PO BOX 141, SWARTSWOOD, NJ 07877-0141
PO BOX 142, SWARTSWOOD, NJ 07877-0142
PO BOX 143, SWARTSWOOD, NJ 07877-0143
PO BOX 144, SWARTSWOOD, NJ 07877-0144
PO BOX 145, SWARTSWOOD, NJ 07877-0145
PO BOX 146, SWARTSWOOD, NJ 07877-0146
PO BOX 147, SWARTSWOOD, NJ 07877-0147
PO BOX 148, SWARTSWOOD, NJ 07877-0148
PO BOX 149, SWARTSWOOD, NJ 07877-0149
PO BOX 150, SWARTSWOOD, NJ 07877-0150
PO BOX 151, SWARTSWOOD, NJ 07877-0151
PO BOX 152, SWARTSWOOD, NJ 07877-0152
PO BOX 153, SWARTSWOOD, NJ 07877-0153
PO BOX 154, SWARTSWOOD, NJ 07877-0154
PO BOX 155, SWARTSWOOD, NJ 07877-0155
PO BOX 156, SWARTSWOOD, NJ 07877-0156
PO BOX 157, SWARTSWOOD, NJ 07877-0157
PO BOX 158, SWARTSWOOD, NJ 07877-0158
PO BOX 159, SWARTSWOOD, NJ 07877-0159
PO BOX 160, SWARTSWOOD, NJ 07877-0160
PO BOX 161, SWARTSWOOD, NJ 07877-0161
PO BOX 162, SWARTSWOOD, NJ 07877-0162
PO BOX 163, SWARTSWOOD, NJ 07877-0163
PO BOX 164, SWARTSWOOD, NJ 07877-0164
PO BOX 165, SWARTSWOOD, NJ 07877-0165
PO BOX 166, SWARTSWOOD, NJ 07877-0166
PO BOX 167, SWARTSWOOD, NJ 07877-0167
PO BOX 168, SWARTSWOOD, NJ 07877-0168
PO BOX 169, SWARTSWOOD, NJ 07877-0169
PO BOX 170, SWARTSWOOD, NJ 07877-0170
PO BOX 171, SWARTSWOOD, NJ 07877-0171
PO BOX 172, SWARTSWOOD, NJ 07877-0172
PO BOX 173, SWARTSWOOD, NJ 07877-0173
PO BOX 174, SWARTSWOOD, NJ 07877-0174
PO BOX 175, SWARTSWOOD, NJ 07877-0175
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