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, ROCKINGHAM, NC 28380-0001
PO BOX 2, ROCKINGHAM, NC 28380-0002
PO BOX 3, ROCKINGHAM, NC 28380-0003
PO BOX 4, ROCKINGHAM, NC 28380-0004
PO BOX 5, ROCKINGHAM, NC 28380-0005
PO BOX 6, ROCKINGHAM, NC 28380-0006
PO BOX 7, ROCKINGHAM, NC 28380-0007
PO BOX 8, ROCKINGHAM, NC 28380-0008
PO BOX 9, ROCKINGHAM, NC 28380-0009
PO BOX 10, ROCKINGHAM, NC 28380-0010
PO BOX 11, ROCKINGHAM, NC 28380-0011
PO BOX 12, ROCKINGHAM, NC 28380-0012
PO BOX 13, ROCKINGHAM, NC 28380-0013
PO BOX 14, ROCKINGHAM, NC 28380-0014
PO BOX 15, ROCKINGHAM, NC 28380-0015
PO BOX 16, ROCKINGHAM, NC 28380-0016
PO BOX 17, ROCKINGHAM, NC 28380-0017
PO BOX 18, ROCKINGHAM, NC 28380-0018
PO BOX 19, ROCKINGHAM, NC 28380-0019
PO BOX 20, ROCKINGHAM, NC 28380-0020
PO BOX 21, ROCKINGHAM, NC 28380-0021
PO BOX 22, ROCKINGHAM, NC 28380-0022
PO BOX 23, ROCKINGHAM, NC 28380-0023
PO BOX 24, ROCKINGHAM, NC 28380-0024
PO BOX 25, ROCKINGHAM, NC 28380-0025
PO BOX 26, ROCKINGHAM, NC 28380-0026
PO BOX 27, ROCKINGHAM, NC 28380-0027
PO BOX 28, ROCKINGHAM, NC 28380-0028
PO BOX 29, ROCKINGHAM, NC 28380-0029
PO BOX 30, ROCKINGHAM, NC 28380-0030
PO BOX 31, ROCKINGHAM, NC 28380-0031
PO BOX 32, ROCKINGHAM, NC 28380-0032
PO BOX 33, ROCKINGHAM, NC 28380-0033
PO BOX 34, ROCKINGHAM, NC 28380-0034
PO BOX 35, ROCKINGHAM, NC 28380-0035
PO BOX 36, ROCKINGHAM, NC 28380-0036
PO BOX 37, ROCKINGHAM, NC 28380-0037
PO BOX 38, ROCKINGHAM, NC 28380-0038
PO BOX 39, ROCKINGHAM, NC 28380-0039
PO BOX 40, ROCKINGHAM, NC 28380-0040
PO BOX 41, ROCKINGHAM, NC 28380-0041
PO BOX 42, ROCKINGHAM, NC 28380-0042
PO BOX 43, ROCKINGHAM, NC 28380-0043
PO BOX 44, ROCKINGHAM, NC 28380-0044
PO BOX 45, ROCKINGHAM, NC 28380-0045
PO BOX 46, ROCKINGHAM, NC 28380-0046
PO BOX 47, ROCKINGHAM, NC 28380-0047
PO BOX 48, ROCKINGHAM, NC 28380-0048
PO BOX 49, ROCKINGHAM, NC 28380-0049
PO BOX 50, ROCKINGHAM, NC 28380-0050
PO BOX 51, ROCKINGHAM, NC 28380-0051
PO BOX 52, ROCKINGHAM, NC 28380-0052
PO BOX 53, ROCKINGHAM, NC 28380-0053
PO BOX 54, ROCKINGHAM, NC 28380-0054
PO BOX 55, ROCKINGHAM, NC 28380-0055
PO BOX 56, ROCKINGHAM, NC 28380-0056
PO BOX 57, ROCKINGHAM, NC 28380-0057
PO BOX 58, ROCKINGHAM, NC 28380-0058
PO BOX 59, ROCKINGHAM, NC 28380-0059
PO BOX 60, ROCKINGHAM, NC 28380-0060
PO BOX 61, ROCKINGHAM, NC 28380-0061
PO BOX 62, ROCKINGHAM, NC 28380-0062
PO BOX 63, ROCKINGHAM, NC 28380-0063
PO BOX 64, ROCKINGHAM, NC 28380-0064
PO BOX 65, ROCKINGHAM, NC 28380-0065
PO BOX 66, ROCKINGHAM, NC 28380-0066
PO BOX 67, ROCKINGHAM, NC 28380-0067
PO BOX 68, ROCKINGHAM, NC 28380-0068
PO BOX 69, ROCKINGHAM, NC 28380-0069
PO BOX 70, ROCKINGHAM, NC 28380-0070
PO BOX 71, ROCKINGHAM, NC 28380-0071
PO BOX 72, ROCKINGHAM, NC 28380-0072
PO BOX 73, ROCKINGHAM, NC 28380-0073
PO BOX 74, ROCKINGHAM, NC 28380-0074
PO BOX 75, ROCKINGHAM, NC 28380-0075
PO BOX 76, ROCKINGHAM, NC 28380-0076
PO BOX 77, ROCKINGHAM, NC 28380-0077
PO BOX 78, ROCKINGHAM, NC 28380-0078
PO BOX 79, ROCKINGHAM, NC 28380-0079
PO BOX 80, ROCKINGHAM, NC 28380-0080
PO BOX 81, ROCKINGHAM, NC 28380-0081
PO BOX 82, ROCKINGHAM, NC 28380-0082
PO BOX 83, ROCKINGHAM, NC 28380-0083
PO BOX 84, ROCKINGHAM, NC 28380-0084
PO BOX 85, ROCKINGHAM, NC 28380-0085
PO BOX 86, ROCKINGHAM, NC 28380-0086
PO BOX 87, ROCKINGHAM, NC 28380-0087
PO BOX 88, ROCKINGHAM, NC 28380-0088
PO BOX 89, ROCKINGHAM, NC 28380-0089
PO BOX 90, ROCKINGHAM, NC 28380-0090
PO BOX 91, ROCKINGHAM, NC 28380-0091
PO BOX 92, ROCKINGHAM, NC 28380-0092
PO BOX 93, ROCKINGHAM, NC 28380-0093
PO BOX 94, ROCKINGHAM, NC 28380-0094
PO BOX 95, ROCKINGHAM, NC 28380-0095
PO BOX 96, ROCKINGHAM, NC 28380-0096
PO BOX 97, ROCKINGHAM, NC 28380-0097
PO BOX 98, ROCKINGHAM, NC 28380-0098
PO BOX 99, ROCKINGHAM, NC 28380-0099
PO BOX 100, ROCKINGHAM, NC 28380-0100
PO BOX 101, ROCKINGHAM, NC 28380-0101
PO BOX 102, ROCKINGHAM, NC 28380-0102
PO BOX 103, ROCKINGHAM, NC 28380-0103
PO BOX 104, ROCKINGHAM, NC 28380-0104
PO BOX 105, ROCKINGHAM, NC 28380-0105
PO BOX 106, ROCKINGHAM, NC 28380-0106
PO BOX 107, ROCKINGHAM, NC 28380-0107
PO BOX 108, ROCKINGHAM, NC 28380-0108
PO BOX 109, ROCKINGHAM, NC 28380-0109
PO BOX 110, ROCKINGHAM, NC 28380-0110
PO BOX 111, ROCKINGHAM, NC 28380-0111
PO BOX 112, ROCKINGHAM, NC 28380-0112
PO BOX 113, ROCKINGHAM, NC 28380-0113
PO BOX 114, ROCKINGHAM, NC 28380-0114
PO BOX 115, ROCKINGHAM, NC 28380-0115
PO BOX 116, ROCKINGHAM, NC 28380-0116
PO BOX 117, ROCKINGHAM, NC 28380-0117
PO BOX 118, ROCKINGHAM, NC 28380-0118
PO BOX 119, ROCKINGHAM, NC 28380-0119
PO BOX 120, ROCKINGHAM, NC 28380-0120
PO BOX 121, ROCKINGHAM, NC 28380-0121
PO BOX 122, ROCKINGHAM, NC 28380-0122
PO BOX 123, ROCKINGHAM, NC 28380-0123
PO BOX 124, ROCKINGHAM, NC 28380-0124
PO BOX 125, ROCKINGHAM, NC 28380-0125
PO BOX 126, ROCKINGHAM, NC 28380-0126
PO BOX 127, ROCKINGHAM, NC 28380-0127
PO BOX 128, ROCKINGHAM, NC 28380-0128
PO BOX 129, ROCKINGHAM, NC 28380-0129
PO BOX 130, ROCKINGHAM, NC 28380-0130
PO BOX 131, ROCKINGHAM, NC 28380-0131
PO BOX 132, ROCKINGHAM, NC 28380-0132
PO BOX 133, ROCKINGHAM, NC 28380-0133
PO BOX 134, ROCKINGHAM, NC 28380-0134
PO BOX 135, ROCKINGHAM, NC 28380-0135
PO BOX 136, ROCKINGHAM, NC 28380-0136
PO BOX 137, ROCKINGHAM, NC 28380-0137
PO BOX 138, ROCKINGHAM, NC 28380-0138
PO BOX 139, ROCKINGHAM, NC 28380-0139
PO BOX 140, ROCKINGHAM, NC 28380-0140
PO BOX 141, ROCKINGHAM, NC 28380-0141
PO BOX 142, ROCKINGHAM, NC 28380-0142
PO BOX 143, ROCKINGHAM, NC 28380-0143
PO BOX 144, ROCKINGHAM, NC 28380-0144
PO BOX 145, ROCKINGHAM, NC 28380-0145
PO BOX 146, ROCKINGHAM, NC 28380-0146
PO BOX 147, ROCKINGHAM, NC 28380-0147
PO BOX 148, ROCKINGHAM, NC 28380-0148
PO BOX 149, ROCKINGHAM, NC 28380-0149
PO BOX 150, ROCKINGHAM, NC 28380-0150
PO BOX 151, ROCKINGHAM, NC 28380-0151
PO BOX 152, ROCKINGHAM, NC 28380-0152
PO BOX 153, ROCKINGHAM, NC 28380-0153
PO BOX 154, ROCKINGHAM, NC 28380-0154
PO BOX 155, ROCKINGHAM, NC 28380-0155
PO BOX 156, ROCKINGHAM, NC 28380-0156
PO BOX 157, ROCKINGHAM, NC 28380-0157
PO BOX 158, ROCKINGHAM, NC 28380-0158
PO BOX 159, ROCKINGHAM, NC 28380-0159
PO BOX 160, ROCKINGHAM, NC 28380-0160
PO BOX 161, ROCKINGHAM, NC 28380-0161
PO BOX 162, ROCKINGHAM, NC 28380-0162
PO BOX 163, ROCKINGHAM, NC 28380-0163
PO BOX 164, ROCKINGHAM, NC 28380-0164
PO BOX 165, ROCKINGHAM, NC 28380-0165
PO BOX 166, ROCKINGHAM, NC 28380-0166
PO BOX 167, ROCKINGHAM, NC 28380-0167
PO BOX 168, ROCKINGHAM, NC 28380-0168
PO BOX 169, ROCKINGHAM, NC 28380-0169
PO BOX 170, ROCKINGHAM, NC 28380-0170
PO BOX 171, ROCKINGHAM, NC 28380-0171
PO BOX 172, ROCKINGHAM, NC 28380-0172
PO BOX 173, ROCKINGHAM, NC 28380-0173
PO BOX 174, ROCKINGHAM, NC 28380-0174
PO BOX 175, ROCKINGHAM, NC 28380-0175
PO BOX 176, ROCKINGHAM, NC 28380-0176
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