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 SAINT JOE, FL 32457-0001
PO BOX 2, PORT SAINT JOE, FL 32457-0002
PO BOX 3, PORT SAINT JOE, FL 32457-0003
PO BOX 4, PORT SAINT JOE, FL 32457-0004
PO BOX 5, PORT SAINT JOE, FL 32457-0005
PO BOX 6, PORT SAINT JOE, FL 32457-0006
PO BOX 7, PORT SAINT JOE, FL 32457-0007
PO BOX 8, PORT SAINT JOE, FL 32457-0008
PO BOX 9, PORT SAINT JOE, FL 32457-0009
PO BOX 10, PORT SAINT JOE, FL 32457-0010
PO BOX 11, PORT SAINT JOE, FL 32457-0011
PO BOX 12, PORT SAINT JOE, FL 32457-0012
PO BOX 13, PORT SAINT JOE, FL 32457-0013
PO BOX 14, PORT SAINT JOE, FL 32457-0014
PO BOX 15, PORT SAINT JOE, FL 32457-0015
PO BOX 16, PORT SAINT JOE, FL 32457-0016
PO BOX 17, PORT SAINT JOE, FL 32457-0017
PO BOX 18, PORT SAINT JOE, FL 32457-0018
PO BOX 19, PORT SAINT JOE, FL 32457-0019
PO BOX 20, PORT SAINT JOE, FL 32457-0020
PO BOX 21, PORT SAINT JOE, FL 32457-0021
PO BOX 22, PORT SAINT JOE, FL 32457-0022
PO BOX 23, PORT SAINT JOE, FL 32457-0023
PO BOX 24, PORT SAINT JOE, FL 32457-0024
PO BOX 25, PORT SAINT JOE, FL 32457-0025
PO BOX 26, PORT SAINT JOE, FL 32457-0026
PO BOX 27, PORT SAINT JOE, FL 32457-0027
PO BOX 28, PORT SAINT JOE, FL 32457-0028
PO BOX 29, PORT SAINT JOE, FL 32457-0029
PO BOX 30, PORT SAINT JOE, FL 32457-0030
PO BOX 31, PORT SAINT JOE, FL 32457-0031
PO BOX 32, PORT SAINT JOE, FL 32457-0032
PO BOX 33, PORT SAINT JOE, FL 32457-0033
PO BOX 34, PORT SAINT JOE, FL 32457-0034
PO BOX 35, PORT SAINT JOE, FL 32457-0035
PO BOX 36, PORT SAINT JOE, FL 32457-0036
PO BOX 37, PORT SAINT JOE, FL 32457-0037
PO BOX 38, PORT SAINT JOE, FL 32457-0038
PO BOX 39, PORT SAINT JOE, FL 32457-0039
PO BOX 40, PORT SAINT JOE, FL 32457-0040
PO BOX 41, PORT SAINT JOE, FL 32457-0041
PO BOX 42, PORT SAINT JOE, FL 32457-0042
PO BOX 43, PORT SAINT JOE, FL 32457-0043
PO BOX 44, PORT SAINT JOE, FL 32457-0044
PO BOX 45, PORT SAINT JOE, FL 32457-0045
PO BOX 46, PORT SAINT JOE, FL 32457-0046
PO BOX 47, PORT SAINT JOE, FL 32457-0047
PO BOX 48, PORT SAINT JOE, FL 32457-0048
PO BOX 49, PORT SAINT JOE, FL 32457-0049
PO BOX 50, PORT SAINT JOE, FL 32457-0050
PO BOX 51, PORT SAINT JOE, FL 32457-0051
PO BOX 52, PORT SAINT JOE, FL 32457-0052
PO BOX 53, PORT SAINT JOE, FL 32457-0053
PO BOX 54, PORT SAINT JOE, FL 32457-0054
PO BOX 55, PORT SAINT JOE, FL 32457-0055
PO BOX 56, PORT SAINT JOE, FL 32457-0056
PO BOX 57, PORT SAINT JOE, FL 32457-0057
PO BOX 58, PORT SAINT JOE, FL 32457-0058
PO BOX 59, PORT SAINT JOE, FL 32457-0059
PO BOX 60, PORT SAINT JOE, FL 32457-0060
PO BOX 61, PORT SAINT JOE, FL 32457-0061
PO BOX 62, PORT SAINT JOE, FL 32457-0062
PO BOX 63, PORT SAINT JOE, FL 32457-0063
PO BOX 64, PORT SAINT JOE, FL 32457-0064
PO BOX 65, PORT SAINT JOE, FL 32457-0065
PO BOX 66, PORT SAINT JOE, FL 32457-0066
PO BOX 67, PORT SAINT JOE, FL 32457-0067
PO BOX 68, PORT SAINT JOE, FL 32457-0068
PO BOX 69, PORT SAINT JOE, FL 32457-0069
PO BOX 70, PORT SAINT JOE, FL 32457-0070
PO BOX 71, PORT SAINT JOE, FL 32457-0071
PO BOX 72, PORT SAINT JOE, FL 32457-0072
PO BOX 73, PORT SAINT JOE, FL 32457-0073
PO BOX 74, PORT SAINT JOE, FL 32457-0074
PO BOX 75, PORT SAINT JOE, FL 32457-0075
PO BOX 76, PORT SAINT JOE, FL 32457-0076
PO BOX 77, PORT SAINT JOE, FL 32457-0077
PO BOX 78, PORT SAINT JOE, FL 32457-0078
PO BOX 79, PORT SAINT JOE, FL 32457-0079
PO BOX 80, PORT SAINT JOE, FL 32457-0080
PO BOX 81, PORT SAINT JOE, FL 32457-0081
PO BOX 82, PORT SAINT JOE, FL 32457-0082
PO BOX 83, PORT SAINT JOE, FL 32457-0083
PO BOX 84, PORT SAINT JOE, FL 32457-0084
PO BOX 85, PORT SAINT JOE, FL 32457-0085
PO BOX 86, PORT SAINT JOE, FL 32457-0086
PO BOX 87, PORT SAINT JOE, FL 32457-0087
PO BOX 88, PORT SAINT JOE, FL 32457-0088
PO BOX 89, PORT SAINT JOE, FL 32457-0089
PO BOX 90, PORT SAINT JOE, FL 32457-0090
PO BOX 91, PORT SAINT JOE, FL 32457-0091
PO BOX 92, PORT SAINT JOE, FL 32457-0092
PO BOX 93, PORT SAINT JOE, FL 32457-0093
PO BOX 94, PORT SAINT JOE, FL 32457-0094
PO BOX 95, PORT SAINT JOE, FL 32457-0095
PO BOX 96, PORT SAINT JOE, FL 32457-0096
PO BOX 97, PORT SAINT JOE, FL 32457-0097
PO BOX 98, PORT SAINT JOE, FL 32457-0098
PO BOX 99, PORT SAINT JOE, FL 32457-0099
PO BOX 100, PORT SAINT JOE, FL 32457-0100
PO BOX 101, PORT SAINT JOE, FL 32457-0101
PO BOX 102, PORT SAINT JOE, FL 32457-0102
PO BOX 103, PORT SAINT JOE, FL 32457-0103
PO BOX 104, PORT SAINT JOE, FL 32457-0104
PO BOX 105, PORT SAINT JOE, FL 32457-0105
PO BOX 106, PORT SAINT JOE, FL 32457-0106
PO BOX 107, PORT SAINT JOE, FL 32457-0107
PO BOX 108, PORT SAINT JOE, FL 32457-0108
PO BOX 109, PORT SAINT JOE, FL 32457-0109
PO BOX 110, PORT SAINT JOE, FL 32457-0110
PO BOX 111, PORT SAINT JOE, FL 32457-0111
PO BOX 112, PORT SAINT JOE, FL 32457-0112
PO BOX 113, PORT SAINT JOE, FL 32457-0113
PO BOX 114, PORT SAINT JOE, FL 32457-0114
PO BOX 115, PORT SAINT JOE, FL 32457-0115
PO BOX 116, PORT SAINT JOE, FL 32457-0116
PO BOX 117, PORT SAINT JOE, FL 32457-0117
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