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 21, JACKSONVILLE, NC 28541-0021
PO BOX 22, JACKSONVILLE, NC 28541-0022
PO BOX 23, JACKSONVILLE, NC 28541-0023
PO BOX 24, JACKSONVILLE, NC 28541-0024
PO BOX 25, JACKSONVILLE, NC 28541-0025
PO BOX 26, JACKSONVILLE, NC 28541-0026
PO BOX 27, JACKSONVILLE, NC 28541-0027
PO BOX 28, JACKSONVILLE, NC 28541-0028
PO BOX 29, JACKSONVILLE, NC 28541-0029
PO BOX 30, JACKSONVILLE, NC 28541-0030
PO BOX 31, JACKSONVILLE, NC 28541-0031
PO BOX 32, JACKSONVILLE, NC 28541-0032
PO BOX 33, JACKSONVILLE, NC 28541-0033
PO BOX 34, JACKSONVILLE, NC 28541-0034
PO BOX 35, JACKSONVILLE, NC 28541-0035
PO BOX 36, JACKSONVILLE, NC 28541-0036
PO BOX 37, JACKSONVILLE, NC 28541-0037
PO BOX 38, JACKSONVILLE, NC 28541-0038
PO BOX 39, JACKSONVILLE, NC 28541-0039
PO BOX 40, JACKSONVILLE, NC 28541-0040
PO BOX 41, JACKSONVILLE, NC 28541-0041
PO BOX 42, JACKSONVILLE, NC 28541-0042
PO BOX 43, JACKSONVILLE, NC 28541-0043
PO BOX 44, JACKSONVILLE, NC 28541-0044
PO BOX 45, JACKSONVILLE, NC 28541-0045
PO BOX 46, JACKSONVILLE, NC 28541-0046
PO BOX 47, JACKSONVILLE, NC 28541-0047
PO BOX 48, JACKSONVILLE, NC 28541-0048
PO BOX 49, JACKSONVILLE, NC 28541-0049
PO BOX 50, JACKSONVILLE, NC 28541-0050
PO BOX 51, JACKSONVILLE, NC 28541-0051
PO BOX 52, JACKSONVILLE, NC 28541-0052
PO BOX 53, JACKSONVILLE, NC 28541-0053
PO BOX 54, JACKSONVILLE, NC 28541-0054
PO BOX 55, JACKSONVILLE, NC 28541-0055
PO BOX 56, JACKSONVILLE, NC 28541-0056
PO BOX 57, JACKSONVILLE, NC 28541-0057
PO BOX 58, JACKSONVILLE, NC 28541-0058
PO BOX 59, JACKSONVILLE, NC 28541-0059
PO BOX 60, JACKSONVILLE, NC 28541-0060
PO BOX 61, JACKSONVILLE, NC 28541-0061
PO BOX 62, JACKSONVILLE, NC 28541-0062
PO BOX 63, JACKSONVILLE, NC 28541-0063
PO BOX 64, JACKSONVILLE, NC 28541-0064
PO BOX 65, JACKSONVILLE, NC 28541-0065
PO BOX 66, JACKSONVILLE, NC 28541-0066
PO BOX 67, JACKSONVILLE, NC 28541-0067
PO BOX 68, JACKSONVILLE, NC 28541-0068
PO BOX 69, JACKSONVILLE, NC 28541-0069
PO BOX 70, JACKSONVILLE, NC 28541-0070
PO BOX 71, JACKSONVILLE, NC 28541-0071
PO BOX 72, JACKSONVILLE, NC 28541-0072
PO BOX 73, JACKSONVILLE, NC 28541-0073
PO BOX 74, JACKSONVILLE, NC 28541-0074
PO BOX 75, JACKSONVILLE, NC 28541-0075
PO BOX 76, JACKSONVILLE, NC 28541-0076
PO BOX 77, JACKSONVILLE, NC 28541-0077
PO BOX 78, JACKSONVILLE, NC 28541-0078
PO BOX 79, JACKSONVILLE, NC 28541-0079
PO BOX 80, JACKSONVILLE, NC 28541-0080
PO BOX 81, JACKSONVILLE, NC 28541-0081
PO BOX 82, JACKSONVILLE, NC 28541-0082
PO BOX 83, JACKSONVILLE, NC 28541-0083
PO BOX 84, JACKSONVILLE, NC 28541-0084
PO BOX 85, JACKSONVILLE, NC 28541-0085
PO BOX 86, JACKSONVILLE, NC 28541-0086
PO BOX 87, JACKSONVILLE, NC 28541-0087
PO BOX 88, JACKSONVILLE, NC 28541-0088
PO BOX 89, JACKSONVILLE, NC 28541-0089
PO BOX 90, JACKSONVILLE, NC 28541-0090
PO BOX 91, JACKSONVILLE, NC 28541-0091
PO BOX 92, JACKSONVILLE, NC 28541-0092
PO BOX 93, JACKSONVILLE, NC 28541-0093
PO BOX 94, JACKSONVILLE, NC 28541-0094
PO BOX 95, JACKSONVILLE, NC 28541-0095
PO BOX 96, JACKSONVILLE, NC 28541-0096
PO BOX 97, JACKSONVILLE, NC 28541-0097
PO BOX 98, JACKSONVILLE, NC 28541-0098
PO BOX 99, JACKSONVILLE, NC 28541-0099
PO BOX 100, JACKSONVILLE, NC 28541-0100
PO BOX 101, JACKSONVILLE, NC 28541-0101
PO BOX 102, JACKSONVILLE, NC 28541-0102
PO BOX 103, JACKSONVILLE, NC 28541-0103
PO BOX 104, JACKSONVILLE, NC 28541-0104
PO BOX 105, JACKSONVILLE, NC 28541-0105
PO BOX 106, JACKSONVILLE, NC 28541-0106
PO BOX 107, JACKSONVILLE, NC 28541-0107
PO BOX 108, JACKSONVILLE, NC 28541-0108
PO BOX 109, JACKSONVILLE, NC 28541-0109
PO BOX 110, JACKSONVILLE, NC 28541-0110
PO BOX 111, JACKSONVILLE, NC 28541-0111
PO BOX 112, JACKSONVILLE, NC 28541-0112
PO BOX 113, JACKSONVILLE, NC 28541-0113
PO BOX 114, JACKSONVILLE, NC 28541-0114
PO BOX 115, JACKSONVILLE, NC 28541-0115
PO BOX 116, JACKSONVILLE, NC 28541-0116
PO BOX 117, JACKSONVILLE, NC 28541-0117
PO BOX 118, JACKSONVILLE, NC 28541-0118
PO BOX 119, JACKSONVILLE, NC 28541-0119
PO BOX 120, JACKSONVILLE, NC 28541-0120
PO BOX 121, JACKSONVILLE, NC 28541-0121
PO BOX 122, JACKSONVILLE, NC 28541-0122
PO BOX 123, JACKSONVILLE, NC 28541-0123
PO BOX 124, JACKSONVILLE, NC 28541-0124
PO BOX 125, JACKSONVILLE, NC 28541-0125
PO BOX 126, JACKSONVILLE, NC 28541-0126
PO BOX 127, JACKSONVILLE, NC 28541-0127
PO BOX 128, JACKSONVILLE, NC 28541-0128
PO BOX 129, JACKSONVILLE, NC 28541-0129
PO BOX 130, JACKSONVILLE, NC 28541-0130
PO BOX 131, JACKSONVILLE, NC 28541-0131
PO BOX 132, JACKSONVILLE, NC 28541-0132
PO BOX 133, JACKSONVILLE, NC 28541-0133
PO BOX 134, JACKSONVILLE, NC 28541-0134
PO BOX 135, JACKSONVILLE, NC 28541-0135
PO BOX 136, JACKSONVILLE, NC 28541-0136
PO BOX 137, JACKSONVILLE, NC 28541-0137
PO BOX 138, JACKSONVILLE, NC 28541-0138
PO BOX 139, JACKSONVILLE, NC 28541-0139
PO BOX 140, JACKSONVILLE, NC 28541-0140
PO BOX 141, JACKSONVILLE, NC 28541-0141
PO BOX 142, JACKSONVILLE, NC 28541-0142
PO BOX 143, JACKSONVILLE, NC 28541-0143
PO BOX 144, JACKSONVILLE, NC 28541-0144
PO BOX 145, JACKSONVILLE, NC 28541-0145
PO BOX 146, JACKSONVILLE, NC 28541-0146
PO BOX 147, JACKSONVILLE, NC 28541-0147
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