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, CASTLE HAYNE, NC 28429-0021
PO BOX 22, CASTLE HAYNE, NC 28429-0022
PO BOX 23, CASTLE HAYNE, NC 28429-0023
PO BOX 24, CASTLE HAYNE, NC 28429-0024
PO BOX 25, CASTLE HAYNE, NC 28429-0025
PO BOX 26, CASTLE HAYNE, NC 28429-0026
PO BOX 27, CASTLE HAYNE, NC 28429-0027
PO BOX 28, CASTLE HAYNE, NC 28429-0028
PO BOX 29, CASTLE HAYNE, NC 28429-0029
PO BOX 30, CASTLE HAYNE, NC 28429-0030
PO BOX 31, CASTLE HAYNE, NC 28429-0031
PO BOX 32, CASTLE HAYNE, NC 28429-0032
PO BOX 33, CASTLE HAYNE, NC 28429-0033
PO BOX 34, CASTLE HAYNE, NC 28429-0034
PO BOX 35, CASTLE HAYNE, NC 28429-0035
PO BOX 36, CASTLE HAYNE, NC 28429-0036
PO BOX 37, CASTLE HAYNE, NC 28429-0037
PO BOX 38, CASTLE HAYNE, NC 28429-0038
PO BOX 39, CASTLE HAYNE, NC 28429-0039
PO BOX 40, CASTLE HAYNE, NC 28429-0040
PO BOX 41, CASTLE HAYNE, NC 28429-0041
PO BOX 42, CASTLE HAYNE, NC 28429-0042
PO BOX 43, CASTLE HAYNE, NC 28429-0043
PO BOX 44, CASTLE HAYNE, NC 28429-0044
PO BOX 45, CASTLE HAYNE, NC 28429-0045
PO BOX 46, CASTLE HAYNE, NC 28429-0046
PO BOX 47, CASTLE HAYNE, NC 28429-0047
PO BOX 48, CASTLE HAYNE, NC 28429-0048
PO BOX 49, CASTLE HAYNE, NC 28429-0049
PO BOX 50, CASTLE HAYNE, NC 28429-0050
PO BOX 51, CASTLE HAYNE, NC 28429-0051
PO BOX 52, CASTLE HAYNE, NC 28429-0052
PO BOX 53, CASTLE HAYNE, NC 28429-0053
PO BOX 54, CASTLE HAYNE, NC 28429-0054
PO BOX 55, CASTLE HAYNE, NC 28429-0055
PO BOX 56, CASTLE HAYNE, NC 28429-0056
PO BOX 57, CASTLE HAYNE, NC 28429-0057
PO BOX 58, CASTLE HAYNE, NC 28429-0058
PO BOX 59, CASTLE HAYNE, NC 28429-0059
PO BOX 60, CASTLE HAYNE, NC 28429-0060
PO BOX 61, CASTLE HAYNE, NC 28429-0061
PO BOX 62, CASTLE HAYNE, NC 28429-0062
PO BOX 63, CASTLE HAYNE, NC 28429-0063
PO BOX 64, CASTLE HAYNE, NC 28429-0064
PO BOX 65, CASTLE HAYNE, NC 28429-0065
PO BOX 66, CASTLE HAYNE, NC 28429-0066
PO BOX 67, CASTLE HAYNE, NC 28429-0067
PO BOX 68, CASTLE HAYNE, NC 28429-0068
PO BOX 69, CASTLE HAYNE, NC 28429-0069
PO BOX 70, CASTLE HAYNE, NC 28429-0070
PO BOX 71, CASTLE HAYNE, NC 28429-0071
PO BOX 72, CASTLE HAYNE, NC 28429-0072
PO BOX 73, CASTLE HAYNE, NC 28429-0073
PO BOX 74, CASTLE HAYNE, NC 28429-0074
PO BOX 75, CASTLE HAYNE, NC 28429-0075
PO BOX 76, CASTLE HAYNE, NC 28429-0076
PO BOX 77, CASTLE HAYNE, NC 28429-0077
PO BOX 78, CASTLE HAYNE, NC 28429-0078
PO BOX 79, CASTLE HAYNE, NC 28429-0079
PO BOX 80, CASTLE HAYNE, NC 28429-0080
PO BOX 81, CASTLE HAYNE, NC 28429-0081
PO BOX 82, CASTLE HAYNE, NC 28429-0082
PO BOX 83, CASTLE HAYNE, NC 28429-0083
PO BOX 84, CASTLE HAYNE, NC 28429-0084
PO BOX 85, CASTLE HAYNE, NC 28429-0085
PO BOX 86, CASTLE HAYNE, NC 28429-0086
PO BOX 87, CASTLE HAYNE, NC 28429-0087
PO BOX 88, CASTLE HAYNE, NC 28429-0088
PO BOX 89, CASTLE HAYNE, NC 28429-0089
PO BOX 90, CASTLE HAYNE, NC 28429-0090
PO BOX 91, CASTLE HAYNE, NC 28429-0091
PO BOX 92, CASTLE HAYNE, NC 28429-0092
PO BOX 93, CASTLE HAYNE, NC 28429-0093
PO BOX 94, CASTLE HAYNE, NC 28429-0094
PO BOX 95, CASTLE HAYNE, NC 28429-0095
PO BOX 96, CASTLE HAYNE, NC 28429-0096
PO BOX 97, CASTLE HAYNE, NC 28429-0097
PO BOX 98, CASTLE HAYNE, NC 28429-0098
PO BOX 99, CASTLE HAYNE, NC 28429-0099
PO BOX 100, CASTLE HAYNE, NC 28429-0100
PO BOX 101, CASTLE HAYNE, NC 28429-0101
PO BOX 102, CASTLE HAYNE, NC 28429-0102
PO BOX 103, CASTLE HAYNE, NC 28429-0103
PO BOX 104, CASTLE HAYNE, NC 28429-0104
PO BOX 105, CASTLE HAYNE, NC 28429-0105
PO BOX 106, CASTLE HAYNE, NC 28429-0106
PO BOX 107, CASTLE HAYNE, NC 28429-0107
PO BOX 108, CASTLE HAYNE, NC 28429-0108
PO BOX 109, CASTLE HAYNE, NC 28429-0109
PO BOX 110, CASTLE HAYNE, NC 28429-0110
PO BOX 111, CASTLE HAYNE, NC 28429-0111
PO BOX 112, CASTLE HAYNE, NC 28429-0112
PO BOX 113, CASTLE HAYNE, NC 28429-0113
PO BOX 114, CASTLE HAYNE, NC 28429-0114
PO BOX 115, CASTLE HAYNE, NC 28429-0115
PO BOX 116, CASTLE HAYNE, NC 28429-0116
PO BOX 117, CASTLE HAYNE, NC 28429-0117
PO BOX 118, CASTLE HAYNE, NC 28429-0118
PO BOX 119, CASTLE HAYNE, NC 28429-0119
PO BOX 120, CASTLE HAYNE, NC 28429-0120
PO BOX 121, CASTLE HAYNE, NC 28429-0121
PO BOX 122, CASTLE HAYNE, NC 28429-0122
PO BOX 123, CASTLE HAYNE, NC 28429-0123
PO BOX 124, CASTLE HAYNE, NC 28429-0124
PO BOX 125, CASTLE HAYNE, NC 28429-0125
PO BOX 126, CASTLE HAYNE, NC 28429-0126
PO BOX 127, CASTLE HAYNE, NC 28429-0127
PO BOX 128, CASTLE HAYNE, NC 28429-0128
PO BOX 129, CASTLE HAYNE, NC 28429-0129
PO BOX 130, CASTLE HAYNE, NC 28429-0130
PO BOX 131, CASTLE HAYNE, NC 28429-0131
PO BOX 132, CASTLE HAYNE, NC 28429-0132
PO BOX 133, CASTLE HAYNE, NC 28429-0133
PO BOX 134, CASTLE HAYNE, NC 28429-0134
PO BOX 135, CASTLE HAYNE, NC 28429-0135
PO BOX 136, CASTLE HAYNE, NC 28429-0136
PO BOX 137, CASTLE HAYNE, NC 28429-0137
PO BOX 138, CASTLE HAYNE, NC 28429-0138
PO BOX 139, CASTLE HAYNE, NC 28429-0139
PO BOX 140, CASTLE HAYNE, NC 28429-0140
PO BOX 141, CASTLE HAYNE, NC 28429-0141
PO BOX 142, CASTLE HAYNE, NC 28429-0142
PO BOX 143, CASTLE HAYNE, NC 28429-0143
PO BOX 144, CASTLE HAYNE, NC 28429-0144
PO BOX 145, CASTLE HAYNE, NC 28429-0145
PO BOX 146, CASTLE HAYNE, NC 28429-0146
PO BOX 147, CASTLE HAYNE, NC 28429-0147
PO BOX 148, CASTLE HAYNE, NC 28429-0148
PO BOX 149, CASTLE HAYNE, NC 28429-0149
PO BOX 150, CASTLE HAYNE, NC 28429-0150
PO BOX 151, CASTLE HAYNE, NC 28429-0151
PO BOX 152, CASTLE HAYNE, NC 28429-0152
PO BOX 153, CASTLE HAYNE, NC 28429-0153
PO BOX 154, CASTLE HAYNE, NC 28429-0154
PO BOX 155, CASTLE HAYNE, NC 28429-0155
PO BOX 156, CASTLE HAYNE, NC 28429-0156
PO BOX 157, CASTLE HAYNE, NC 28429-0157
PO BOX 158, CASTLE HAYNE, NC 28429-0158
PO BOX 159, CASTLE HAYNE, NC 28429-0159
PO BOX 160, CASTLE HAYNE, NC 28429-0160
PO BOX 161, CASTLE HAYNE, NC 28429-0161
PO BOX 162, CASTLE HAYNE, NC 28429-0162
PO BOX 163, CASTLE HAYNE, NC 28429-0163
PO BOX 164, CASTLE HAYNE, NC 28429-0164
PO BOX 165, CASTLE HAYNE, NC 28429-0165
PO BOX 166, CASTLE HAYNE, NC 28429-0166
PO BOX 167, CASTLE HAYNE, NC 28429-0167
PO BOX 168, CASTLE HAYNE, NC 28429-0168
PO BOX 169, CASTLE HAYNE, NC 28429-0169
PO BOX 170, CASTLE HAYNE, NC 28429-0170
PO BOX 171, CASTLE HAYNE, NC 28429-0171
PO BOX 172, CASTLE HAYNE, NC 28429-0172
PO BOX 173, CASTLE HAYNE, NC 28429-0173
PO BOX 174, CASTLE HAYNE, NC 28429-0174
PO BOX 175, CASTLE HAYNE, NC 28429-0175
PO BOX 176, CASTLE HAYNE, NC 28429-0176