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, MADISON, FL 32341-0001
PO BOX 2, MADISON, FL 32341-0002
PO BOX 3, MADISON, FL 32341-0003
PO BOX 4, MADISON, FL 32341-0004
PO BOX 5, MADISON, FL 32341-0005
PO BOX 6, MADISON, FL 32341-0006
PO BOX 7, MADISON, FL 32341-0007
PO BOX 8, MADISON, FL 32341-0008
PO BOX 9, MADISON, FL 32341-0009
PO BOX 10, MADISON, FL 32341-0010
PO BOX 11, MADISON, FL 32341-0011
PO BOX 12, MADISON, FL 32341-0012
PO BOX 13, MADISON, FL 32341-0013
PO BOX 14, MADISON, FL 32341-0014
PO BOX 15, MADISON, FL 32341-0015
PO BOX 16, MADISON, FL 32341-0016
PO BOX 17, MADISON, FL 32341-0017
PO BOX 18, MADISON, FL 32341-0018
PO BOX 19, MADISON, FL 32341-0019
PO BOX 20, MADISON, FL 32341-0020
PO BOX 21, MADISON, FL 32341-0021
PO BOX 22, MADISON, FL 32341-0022
PO BOX 23, MADISON, FL 32341-0023
PO BOX 24, MADISON, FL 32341-0024
PO BOX 25, MADISON, FL 32341-0025
PO BOX 26, MADISON, FL 32341-0026
PO BOX 27, MADISON, FL 32341-0027
PO BOX 28, MADISON, FL 32341-0028
PO BOX 29, MADISON, FL 32341-0029
PO BOX 30, MADISON, FL 32341-0030
PO BOX 31, MADISON, FL 32341-0031
PO BOX 32, MADISON, FL 32341-0032
PO BOX 33, MADISON, FL 32341-0033
PO BOX 34, MADISON, FL 32341-0034
PO BOX 35, MADISON, FL 32341-0035
PO BOX 36, MADISON, FL 32341-0036
PO BOX 37, MADISON, FL 32341-0037
PO BOX 38, MADISON, FL 32341-0038
PO BOX 39, MADISON, FL 32341-0039
PO BOX 40, MADISON, FL 32341-0040
PO BOX 41, MADISON, FL 32341-0041
PO BOX 42, MADISON, FL 32341-0042
PO BOX 43, MADISON, FL 32341-0043
PO BOX 44, MADISON, FL 32341-0044
PO BOX 45, MADISON, FL 32341-0045
PO BOX 46, MADISON, FL 32341-0046
PO BOX 47, MADISON, FL 32341-0047
PO BOX 48, MADISON, FL 32341-0048
PO BOX 49, MADISON, FL 32341-0049
PO BOX 50, MADISON, FL 32341-0050
PO BOX 51, MADISON, FL 32341-0051
PO BOX 52, MADISON, FL 32341-0052
PO BOX 53, MADISON, FL 32341-0053
PO BOX 54, MADISON, FL 32341-0054
PO BOX 55, MADISON, FL 32341-0055
PO BOX 56, MADISON, FL 32341-0056
PO BOX 57, MADISON, FL 32341-0057
PO BOX 58, MADISON, FL 32341-0058
PO BOX 59, MADISON, FL 32341-0059
PO BOX 60, MADISON, FL 32341-0060
PO BOX 61, MADISON, FL 32341-0061
PO BOX 62, MADISON, FL 32341-0062
PO BOX 63, MADISON, FL 32341-0063
PO BOX 64, MADISON, FL 32341-0064
PO BOX 65, MADISON, FL 32341-0065
PO BOX 66, MADISON, FL 32341-0066
PO BOX 67, MADISON, FL 32341-0067
PO BOX 68, MADISON, FL 32341-0068
PO BOX 69, MADISON, FL 32341-0069
PO BOX 70, MADISON, FL 32341-0070
PO BOX 71, MADISON, FL 32341-0071
PO BOX 72, MADISON, FL 32341-0072
PO BOX 73, MADISON, FL 32341-0073
PO BOX 74, MADISON, FL 32341-0074
PO BOX 75, MADISON, FL 32341-0075
PO BOX 76, MADISON, FL 32341-0076
PO BOX 77, MADISON, FL 32341-0077
PO BOX 78, MADISON, FL 32341-0078
PO BOX 79, MADISON, FL 32341-0079
PO BOX 80, MADISON, FL 32341-0080
PO BOX 81, MADISON, FL 32341-0081
PO BOX 82, MADISON, FL 32341-0082
PO BOX 83, MADISON, FL 32341-0083
PO BOX 84, MADISON, FL 32341-0084
PO BOX 85, MADISON, FL 32341-0085
PO BOX 86, MADISON, FL 32341-0086
PO BOX 87, MADISON, FL 32341-0087
PO BOX 88, MADISON, FL 32341-0088
PO BOX 89, MADISON, FL 32341-0089
PO BOX 90, MADISON, FL 32341-0090
PO BOX 91, MADISON, FL 32341-0091
PO BOX 92, MADISON, FL 32341-0092
PO BOX 93, MADISON, FL 32341-0093
PO BOX 94, MADISON, FL 32341-0094
PO BOX 95, MADISON, FL 32341-0095
PO BOX 96, MADISON, FL 32341-0096
PO BOX 97, MADISON, FL 32341-0097
PO BOX 98, MADISON, FL 32341-0098
PO BOX 99, MADISON, FL 32341-0099
PO BOX 100, MADISON, FL 32341-0100
PO BOX 101, MADISON, FL 32341-0101
PO BOX 102, MADISON, FL 32341-0102
PO BOX 103, MADISON, FL 32341-0103
PO BOX 104, MADISON, FL 32341-0104
PO BOX 105, MADISON, FL 32341-0105
PO BOX 106, MADISON, FL 32341-0106
PO BOX 107, MADISON, FL 32341-0107
PO BOX 108, MADISON, FL 32341-0108
PO BOX 109, MADISON, FL 32341-0109
PO BOX 110, MADISON, FL 32341-0110
PO BOX 111, MADISON, FL 32341-0111
PO BOX 112, MADISON, FL 32341-0112
PO BOX 113, MADISON, FL 32341-0113
PO BOX 114, MADISON, FL 32341-0114
PO BOX 115, MADISON, FL 32341-0115
PO BOX 116, MADISON, FL 32341-0116
PO BOX 117, MADISON, FL 32341-0117
PO BOX 118, MADISON, FL 32341-0118
PO BOX 119, MADISON, FL 32341-0119
PO BOX 120, MADISON, FL 32341-0120
PO BOX 121, MADISON, FL 32341-0121
PO BOX 122, MADISON, FL 32341-0122
PO BOX 123, MADISON, FL 32341-0123
PO BOX 124, MADISON, FL 32341-0124
PO BOX 125, MADISON, FL 32341-0125
PO BOX 126, MADISON, FL 32341-0126
PO BOX 127, MADISON, FL 32341-0127
PO BOX 128, MADISON, FL 32341-0128
PO BOX 129, MADISON, FL 32341-0129
PO BOX 130, MADISON, FL 32341-0130
PO BOX 131, MADISON, FL 32341-0131
PO BOX 132, MADISON, FL 32341-0132
PO BOX 133, MADISON, FL 32341-0133
PO BOX 134, MADISON, FL 32341-0134
PO BOX 135, MADISON, FL 32341-0135
PO BOX 136, MADISON, FL 32341-0136
PO BOX 137, MADISON, FL 32341-0137
PO BOX 138, MADISON, FL 32341-0138
PO BOX 139, MADISON, FL 32341-0139
PO BOX 140, MADISON, FL 32341-0140
PO BOX 141, MADISON, FL 32341-0141
PO BOX 142, MADISON, FL 32341-0142
PO BOX 143, MADISON, FL 32341-0143
PO BOX 144, MADISON, FL 32341-0144
PO BOX 145, MADISON, FL 32341-0145
PO BOX 146, MADISON, FL 32341-0146
PO BOX 147, MADISON, FL 32341-0147
PO BOX 148, MADISON, FL 32341-0148
PO BOX 149, MADISON, FL 32341-0149
PO BOX 150, MADISON, FL 32341-0150
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