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, PORT JEFFERSON, NY 11777-0001
PO BOX 2, PORT JEFFERSON, NY 11777-0002
PO BOX 3, PORT JEFFERSON, NY 11777-0003
PO BOX 4, PORT JEFFERSON, NY 11777-0004
PO BOX 5, PORT JEFFERSON, NY 11777-0005
PO BOX 6, PORT JEFFERSON, NY 11777-0006
PO BOX 7, PORT JEFFERSON, NY 11777-0007
PO BOX 8, PORT JEFFERSON, NY 11777-0008
PO BOX 9, PORT JEFFERSON, NY 11777-0009
PO BOX 10, PORT JEFFERSON, NY 11777-0010
PO BOX 11, PORT JEFFERSON, NY 11777-0011
PO BOX 12, PORT JEFFERSON, NY 11777-0012
PO BOX 13, PORT JEFFERSON, NY 11777-0013
PO BOX 14, PORT JEFFERSON, NY 11777-0014
PO BOX 15, PORT JEFFERSON, NY 11777-0015
PO BOX 16, PORT JEFFERSON, NY 11777-0016
PO BOX 17, PORT JEFFERSON, NY 11777-0017
PO BOX 18, PORT JEFFERSON, NY 11777-0018
PO BOX 19, PORT JEFFERSON, NY 11777-0019
PO BOX 20, PORT JEFFERSON, NY 11777-0020
PO BOX 21, PORT JEFFERSON, NY 11777-0021
PO BOX 22, PORT JEFFERSON, NY 11777-0022
PO BOX 23, PORT JEFFERSON, NY 11777-0023
PO BOX 24, PORT JEFFERSON, NY 11777-0024
PO BOX 25, PORT JEFFERSON, NY 11777-0025
PO BOX 26, PORT JEFFERSON, NY 11777-0026
PO BOX 27, PORT JEFFERSON, NY 11777-0027
PO BOX 28, PORT JEFFERSON, NY 11777-0028
PO BOX 29, PORT JEFFERSON, NY 11777-0029
PO BOX 30, PORT JEFFERSON, NY 11777-0030
PO BOX 31, PORT JEFFERSON, NY 11777-0031
PO BOX 32, PORT JEFFERSON, NY 11777-0032
PO BOX 33, PORT JEFFERSON, NY 11777-0033
PO BOX 34, PORT JEFFERSON, NY 11777-0034
PO BOX 35, PORT JEFFERSON, NY 11777-0035
PO BOX 36, PORT JEFFERSON, NY 11777-0036
PO BOX 37, PORT JEFFERSON, NY 11777-0037
PO BOX 38, PORT JEFFERSON, NY 11777-0038
PO BOX 39, PORT JEFFERSON, NY 11777-0039
PO BOX 40, PORT JEFFERSON, NY 11777-0040
PO BOX 41, PORT JEFFERSON, NY 11777-0041
PO BOX 42, PORT JEFFERSON, NY 11777-0042
PO BOX 43, PORT JEFFERSON, NY 11777-0043
PO BOX 44, PORT JEFFERSON, NY 11777-0044
PO BOX 45, PORT JEFFERSON, NY 11777-0045
PO BOX 46, PORT JEFFERSON, NY 11777-0046
PO BOX 47, PORT JEFFERSON, NY 11777-0047
PO BOX 48, PORT JEFFERSON, NY 11777-0048
PO BOX 49, PORT JEFFERSON, NY 11777-0049
PO BOX 50, PORT JEFFERSON, NY 11777-0050
PO BOX 51, PORT JEFFERSON, NY 11777-0051
PO BOX 52, PORT JEFFERSON, NY 11777-0052
PO BOX 53, PORT JEFFERSON, NY 11777-0053
PO BOX 54, PORT JEFFERSON, NY 11777-0054
PO BOX 55, PORT JEFFERSON, NY 11777-0055
PO BOX 56, PORT JEFFERSON, NY 11777-0056
PO BOX 57, PORT JEFFERSON, NY 11777-0057
PO BOX 58, PORT JEFFERSON, NY 11777-0058
PO BOX 59, PORT JEFFERSON, NY 11777-0059
PO BOX 60, PORT JEFFERSON, NY 11777-0060
PO BOX 61, PORT JEFFERSON, NY 11777-0061
PO BOX 62, PORT JEFFERSON, NY 11777-0062
PO BOX 63, PORT JEFFERSON, NY 11777-0063
PO BOX 64, PORT JEFFERSON, NY 11777-0064
PO BOX 65, PORT JEFFERSON, NY 11777-0065
PO BOX 66, PORT JEFFERSON, NY 11777-0066
PO BOX 67, PORT JEFFERSON, NY 11777-0067
PO BOX 68, PORT JEFFERSON, NY 11777-0068
PO BOX 69, PORT JEFFERSON, NY 11777-0069
PO BOX 70, PORT JEFFERSON, NY 11777-0070
PO BOX 71, PORT JEFFERSON, NY 11777-0071
PO BOX 72, PORT JEFFERSON, NY 11777-0072
PO BOX 73, PORT JEFFERSON, NY 11777-0073
PO BOX 74, PORT JEFFERSON, NY 11777-0074
PO BOX 75, PORT JEFFERSON, NY 11777-0075
PO BOX 76, PORT JEFFERSON, NY 11777-0076
PO BOX 77, PORT JEFFERSON, NY 11777-0077
PO BOX 78, PORT JEFFERSON, NY 11777-0078
PO BOX 79, PORT JEFFERSON, NY 11777-0079
PO BOX 80, PORT JEFFERSON, NY 11777-0080
PO BOX 81, PORT JEFFERSON, NY 11777-0081
PO BOX 82, PORT JEFFERSON, NY 11777-0082
PO BOX 83, PORT JEFFERSON, NY 11777-0083
PO BOX 84, PORT JEFFERSON, NY 11777-0084
PO BOX 85, PORT JEFFERSON, NY 11777-0085
PO BOX 86, PORT JEFFERSON, NY 11777-0086
PO BOX 87, PORT JEFFERSON, NY 11777-0087
PO BOX 88, PORT JEFFERSON, NY 11777-0088
PO BOX 89, PORT JEFFERSON, NY 11777-0089
PO BOX 90, PORT JEFFERSON, NY 11777-0090
PO BOX 91, PORT JEFFERSON, NY 11777-0091
PO BOX 92, PORT JEFFERSON, NY 11777-0092
PO BOX 93, PORT JEFFERSON, NY 11777-0093
PO BOX 94, PORT JEFFERSON, NY 11777-0094
PO BOX 95, PORT JEFFERSON, NY 11777-0095
PO BOX 96, PORT JEFFERSON, NY 11777-0096
PO BOX 97, PORT JEFFERSON, NY 11777-0097
PO BOX 98, PORT JEFFERSON, NY 11777-0098
PO BOX 99, PORT JEFFERSON, NY 11777-0099
PO BOX 100, PORT JEFFERSON, NY 11777-0100
PO BOX 101, PORT JEFFERSON, NY 11777-0101
PO BOX 102, PORT JEFFERSON, NY 11777-0102
PO BOX 103, PORT JEFFERSON, NY 11777-0103
PO BOX 104, PORT JEFFERSON, NY 11777-0104
PO BOX 105, PORT JEFFERSON, NY 11777-0105
PO BOX 106, PORT JEFFERSON, NY 11777-0106
PO BOX 107, PORT JEFFERSON, NY 11777-0107
PO BOX 108, PORT JEFFERSON, NY 11777-0108
PO BOX 109, PORT JEFFERSON, NY 11777-0109
PO BOX 110, PORT JEFFERSON, NY 11777-0110
PO BOX 111, PORT JEFFERSON, NY 11777-0111
PO BOX 112, PORT JEFFERSON, NY 11777-0112
PO BOX 113, PORT JEFFERSON, NY 11777-0113
PO BOX 114, PORT JEFFERSON, NY 11777-0114
PO BOX 115, PORT JEFFERSON, NY 11777-0115
PO BOX 116, PORT JEFFERSON, NY 11777-0116
PO BOX 117, PORT JEFFERSON, NY 11777-0117
PO BOX 118, PORT JEFFERSON, NY 11777-0118
PO BOX 119, PORT JEFFERSON, NY 11777-0119
PO BOX 120, PORT JEFFERSON, NY 11777-0120
PO BOX 121, PORT JEFFERSON, NY 11777-0121
PO BOX 122, PORT JEFFERSON, NY 11777-0122
PO BOX 123, PORT JEFFERSON, NY 11777-0123
PO BOX 124, PORT JEFFERSON, NY 11777-0124
PO BOX 125, PORT JEFFERSON, NY 11777-0125
PO BOX 126, PORT JEFFERSON, NY 11777-0126
PO BOX 127, PORT JEFFERSON, NY 11777-0127
PO BOX 128, PORT JEFFERSON, NY 11777-0128
PO BOX 129, PORT JEFFERSON, NY 11777-0129
PO BOX 130, PORT JEFFERSON, NY 11777-0130
PO BOX 131, PORT JEFFERSON, NY 11777-0131
PO BOX 132, PORT JEFFERSON, NY 11777-0132
PO BOX 133, PORT JEFFERSON, NY 11777-0133
PO BOX 134, PORT JEFFERSON, NY 11777-0134
PO BOX 135, PORT JEFFERSON, NY 11777-0135
PO BOX 136, PORT JEFFERSON, NY 11777-0136
PO BOX 137, PORT JEFFERSON, NY 11777-0137
PO BOX 138, PORT JEFFERSON, NY 11777-0138
PO BOX 139, PORT JEFFERSON, NY 11777-0139
PO BOX 140, PORT JEFFERSON, NY 11777-0140
PO BOX 141, PORT JEFFERSON, NY 11777-0141
PO BOX 142, PORT JEFFERSON, NY 11777-0142
PO BOX 143, PORT JEFFERSON, NY 11777-0143
PO BOX 144, PORT JEFFERSON, NY 11777-0144
PO BOX 145, PORT JEFFERSON, NY 11777-0145
PO BOX 146, PORT JEFFERSON, NY 11777-0146
PO BOX 147, PORT JEFFERSON, NY 11777-0147
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