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, CRYSTAL RIVER, FL 34423-0001
PO BOX 2, CRYSTAL RIVER, FL 34423-0002
PO BOX 3, CRYSTAL RIVER, FL 34423-0003
PO BOX 4, CRYSTAL RIVER, FL 34423-0004
PO BOX 5, CRYSTAL RIVER, FL 34423-0005
PO BOX 6, CRYSTAL RIVER, FL 34423-0006
PO BOX 7, CRYSTAL RIVER, FL 34423-0007
PO BOX 8, CRYSTAL RIVER, FL 34423-0008
PO BOX 9, CRYSTAL RIVER, FL 34423-0009
PO BOX 10, CRYSTAL RIVER, FL 34423-0010
PO BOX 11, CRYSTAL RIVER, FL 34423-0011
PO BOX 12, CRYSTAL RIVER, FL 34423-0012
PO BOX 13, CRYSTAL RIVER, FL 34423-0013
PO BOX 14, CRYSTAL RIVER, FL 34423-0014
PO BOX 15, CRYSTAL RIVER, FL 34423-0015
PO BOX 16, CRYSTAL RIVER, FL 34423-0016
PO BOX 17, CRYSTAL RIVER, FL 34423-0017
PO BOX 18, CRYSTAL RIVER, FL 34423-0018
PO BOX 19, CRYSTAL RIVER, FL 34423-0019
PO BOX 20, CRYSTAL RIVER, FL 34423-0020
PO BOX 21, CRYSTAL RIVER, FL 34423-0021
PO BOX 22, CRYSTAL RIVER, FL 34423-0022
PO BOX 23, CRYSTAL RIVER, FL 34423-0023
PO BOX 24, CRYSTAL RIVER, FL 34423-0024
PO BOX 25, CRYSTAL RIVER, FL 34423-0025
PO BOX 26, CRYSTAL RIVER, FL 34423-0026
PO BOX 27, CRYSTAL RIVER, FL 34423-0027
PO BOX 28, CRYSTAL RIVER, FL 34423-0028
PO BOX 29, CRYSTAL RIVER, FL 34423-0029
PO BOX 30, CRYSTAL RIVER, FL 34423-0030
PO BOX 31, CRYSTAL RIVER, FL 34423-0031
PO BOX 32, CRYSTAL RIVER, FL 34423-0032
PO BOX 33, CRYSTAL RIVER, FL 34423-0033
PO BOX 34, CRYSTAL RIVER, FL 34423-0034
PO BOX 35, CRYSTAL RIVER, FL 34423-0035
PO BOX 36, CRYSTAL RIVER, FL 34423-0036
PO BOX 37, CRYSTAL RIVER, FL 34423-0037
PO BOX 38, CRYSTAL RIVER, FL 34423-0038
PO BOX 39, CRYSTAL RIVER, FL 34423-0039
PO BOX 40, CRYSTAL RIVER, FL 34423-0040
PO BOX 41, CRYSTAL RIVER, FL 34423-0041
PO BOX 42, CRYSTAL RIVER, FL 34423-0042
PO BOX 43, CRYSTAL RIVER, FL 34423-0043
PO BOX 44, CRYSTAL RIVER, FL 34423-0044
PO BOX 45, CRYSTAL RIVER, FL 34423-0045
PO BOX 46, CRYSTAL RIVER, FL 34423-0046
PO BOX 47, CRYSTAL RIVER, FL 34423-0047
PO BOX 48, CRYSTAL RIVER, FL 34423-0048
PO BOX 49, CRYSTAL RIVER, FL 34423-0049
PO BOX 50, CRYSTAL RIVER, FL 34423-0050
PO BOX 51, CRYSTAL RIVER, FL 34423-0051
PO BOX 52, CRYSTAL RIVER, FL 34423-0052
PO BOX 53, CRYSTAL RIVER, FL 34423-0053
PO BOX 54, CRYSTAL RIVER, FL 34423-0054
PO BOX 55, CRYSTAL RIVER, FL 34423-0055
PO BOX 56, CRYSTAL RIVER, FL 34423-0056
PO BOX 57, CRYSTAL RIVER, FL 34423-0057
PO BOX 58, CRYSTAL RIVER, FL 34423-0058
PO BOX 59, CRYSTAL RIVER, FL 34423-0059
PO BOX 60, CRYSTAL RIVER, FL 34423-0060
PO BOX 61, CRYSTAL RIVER, FL 34423-0061
PO BOX 62, CRYSTAL RIVER, FL 34423-0062
PO BOX 63, CRYSTAL RIVER, FL 34423-0063
PO BOX 64, CRYSTAL RIVER, FL 34423-0064
PO BOX 65, CRYSTAL RIVER, FL 34423-0065
PO BOX 66, CRYSTAL RIVER, FL 34423-0066
PO BOX 67, CRYSTAL RIVER, FL 34423-0067
PO BOX 68, CRYSTAL RIVER, FL 34423-0068
PO BOX 69, CRYSTAL RIVER, FL 34423-0069
PO BOX 70, CRYSTAL RIVER, FL 34423-0070
PO BOX 71, CRYSTAL RIVER, FL 34423-0071
PO BOX 72, CRYSTAL RIVER, FL 34423-0072
PO BOX 73, CRYSTAL RIVER, FL 34423-0073
PO BOX 74, CRYSTAL RIVER, FL 34423-0074
PO BOX 75, CRYSTAL RIVER, FL 34423-0075
PO BOX 76, CRYSTAL RIVER, FL 34423-0076
PO BOX 77, CRYSTAL RIVER, FL 34423-0077
PO BOX 78, CRYSTAL RIVER, FL 34423-0078
PO BOX 79, CRYSTAL RIVER, FL 34423-0079
PO BOX 80, CRYSTAL RIVER, FL 34423-0080
PO BOX 81, CRYSTAL RIVER, FL 34423-0081
PO BOX 82, CRYSTAL RIVER, FL 34423-0082
PO BOX 83, CRYSTAL RIVER, FL 34423-0083
PO BOX 84, CRYSTAL RIVER, FL 34423-0084
PO BOX 85, CRYSTAL RIVER, FL 34423-0085
PO BOX 86, CRYSTAL RIVER, FL 34423-0086
PO BOX 87, CRYSTAL RIVER, FL 34423-0087
PO BOX 88, CRYSTAL RIVER, FL 34423-0088
PO BOX 89, CRYSTAL RIVER, FL 34423-0089
PO BOX 90, CRYSTAL RIVER, FL 34423-0090
PO BOX 91, CRYSTAL RIVER, FL 34423-0091
PO BOX 92, CRYSTAL RIVER, FL 34423-0092
PO BOX 93, CRYSTAL RIVER, FL 34423-0093
PO BOX 94, CRYSTAL RIVER, FL 34423-0094
PO BOX 95, CRYSTAL RIVER, FL 34423-0095
PO BOX 96, CRYSTAL RIVER, FL 34423-0096
PO BOX 97, CRYSTAL RIVER, FL 34423-0097
PO BOX 98, CRYSTAL RIVER, FL 34423-0098
PO BOX 99, CRYSTAL RIVER, FL 34423-0099
PO BOX 100, CRYSTAL RIVER, FL 34423-0100
PO BOX 101, CRYSTAL RIVER, FL 34423-0101
PO BOX 102, CRYSTAL RIVER, FL 34423-0102
PO BOX 103, CRYSTAL RIVER, FL 34423-0103
PO BOX 104, CRYSTAL RIVER, FL 34423-0104
PO BOX 105, CRYSTAL RIVER, FL 34423-0105
PO BOX 106, CRYSTAL RIVER, FL 34423-0106
PO BOX 107, CRYSTAL RIVER, FL 34423-0107
PO BOX 108, CRYSTAL RIVER, FL 34423-0108
PO BOX 109, CRYSTAL RIVER, FL 34423-0109
PO BOX 110, CRYSTAL RIVER, FL 34423-0110
PO BOX 111, CRYSTAL RIVER, FL 34423-0111
PO BOX 112, CRYSTAL RIVER, FL 34423-0112
PO BOX 113, CRYSTAL RIVER, FL 34423-0113
PO BOX 114, CRYSTAL RIVER, FL 34423-0114
PO BOX 115, CRYSTAL RIVER, FL 34423-0115
PO BOX 116, CRYSTAL RIVER, FL 34423-0116
PO BOX 117, CRYSTAL RIVER, FL 34423-0117
PO BOX 118, CRYSTAL RIVER, FL 34423-0118
PO BOX 119, CRYSTAL RIVER, FL 34423-0119
PO BOX 120, CRYSTAL RIVER, FL 34423-0120
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