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, SPARTANBURG, SC 29304-0001
PO BOX 2, SPARTANBURG, SC 29304-0002
PO BOX 3, SPARTANBURG, SC 29304-0003
PO BOX 4, SPARTANBURG, SC 29304-0004
PO BOX 5, SPARTANBURG, SC 29304-0005
PO BOX 6, SPARTANBURG, SC 29304-0006
PO BOX 7, SPARTANBURG, SC 29304-0007
PO BOX 8, SPARTANBURG, SC 29304-0008
PO BOX 9, SPARTANBURG, SC 29304-0009
PO BOX 10, SPARTANBURG, SC 29304-0010
PO BOX 11, SPARTANBURG, SC 29304-0011
PO BOX 12, SPARTANBURG, SC 29304-0012
PO BOX 13, SPARTANBURG, SC 29304-0013
PO BOX 14, SPARTANBURG, SC 29304-0014
PO BOX 15, SPARTANBURG, SC 29304-0015
PO BOX 16, SPARTANBURG, SC 29304-0016
PO BOX 17, SPARTANBURG, SC 29304-0017
PO BOX 18, SPARTANBURG, SC 29304-0018
PO BOX 19, SPARTANBURG, SC 29304-0019
PO BOX 20, SPARTANBURG, SC 29304-0020
PO BOX 21, SPARTANBURG, SC 29304-0021
PO BOX 22, SPARTANBURG, SC 29304-0022
PO BOX 23, SPARTANBURG, SC 29304-0023
PO BOX 24, SPARTANBURG, SC 29304-0024
PO BOX 25, SPARTANBURG, SC 29304-0025
PO BOX 26, SPARTANBURG, SC 29304-0026
PO BOX 27, SPARTANBURG, SC 29304-0027
PO BOX 28, SPARTANBURG, SC 29304-0028
PO BOX 29, SPARTANBURG, SC 29304-0029
PO BOX 30, SPARTANBURG, SC 29304-0030
PO BOX 31, SPARTANBURG, SC 29304-0031
PO BOX 32, SPARTANBURG, SC 29304-0032
PO BOX 33, SPARTANBURG, SC 29304-0033
PO BOX 34, SPARTANBURG, SC 29304-0034
PO BOX 35, SPARTANBURG, SC 29304-0035
PO BOX 36, SPARTANBURG, SC 29304-0036
PO BOX 37, SPARTANBURG, SC 29304-0037
PO BOX 38, SPARTANBURG, SC 29304-0038
PO BOX 39, SPARTANBURG, SC 29304-0039
PO BOX 40, SPARTANBURG, SC 29304-0040
PO BOX 41, SPARTANBURG, SC 29304-0041
PO BOX 42, SPARTANBURG, SC 29304-0042
PO BOX 43, SPARTANBURG, SC 29304-0043
PO BOX 44, SPARTANBURG, SC 29304-0044
PO BOX 45, SPARTANBURG, SC 29304-0045
PO BOX 46, SPARTANBURG, SC 29304-0046
PO BOX 47, SPARTANBURG, SC 29304-0047
PO BOX 48, SPARTANBURG, SC 29304-0048
PO BOX 49, SPARTANBURG, SC 29304-0049
PO BOX 50, SPARTANBURG, SC 29304-0050
PO BOX 51, SPARTANBURG, SC 29304-0051
PO BOX 52, SPARTANBURG, SC 29304-0052
PO BOX 53, SPARTANBURG, SC 29304-0053
PO BOX 54, SPARTANBURG, SC 29304-0054
PO BOX 55, SPARTANBURG, SC 29304-0055
PO BOX 56, SPARTANBURG, SC 29304-0056
PO BOX 57, SPARTANBURG, SC 29304-0057
PO BOX 58, SPARTANBURG, SC 29304-0058
PO BOX 59, SPARTANBURG, SC 29304-0059
PO BOX 60, SPARTANBURG, SC 29304-0060
PO BOX 61, SPARTANBURG, SC 29304-0061
PO BOX 62, SPARTANBURG, SC 29304-0062
PO BOX 63, SPARTANBURG, SC 29304-0063
PO BOX 64, SPARTANBURG, SC 29304-0064
PO BOX 65, SPARTANBURG, SC 29304-0065
PO BOX 66, SPARTANBURG, SC 29304-0066
PO BOX 67, SPARTANBURG, SC 29304-0067
PO BOX 68, SPARTANBURG, SC 29304-0068
PO BOX 69, SPARTANBURG, SC 29304-0069
PO BOX 70, SPARTANBURG, SC 29304-0070
PO BOX 71, SPARTANBURG, SC 29304-0071
PO BOX 72, SPARTANBURG, SC 29304-0072
PO BOX 73, SPARTANBURG, SC 29304-0073
PO BOX 74, SPARTANBURG, SC 29304-0074
PO BOX 75, SPARTANBURG, SC 29304-0075
PO BOX 76, SPARTANBURG, SC 29304-0076
PO BOX 77, SPARTANBURG, SC 29304-0077
PO BOX 78, SPARTANBURG, SC 29304-0078
PO BOX 79, SPARTANBURG, SC 29304-0079
PO BOX 80, SPARTANBURG, SC 29304-0080
PO BOX 81, SPARTANBURG, SC 29304-0081
PO BOX 82, SPARTANBURG, SC 29304-0082
PO BOX 83, SPARTANBURG, SC 29304-0083
PO BOX 84, SPARTANBURG, SC 29304-0084
PO BOX 85, SPARTANBURG, SC 29304-0085
PO BOX 86, SPARTANBURG, SC 29304-0086
PO BOX 87, SPARTANBURG, SC 29304-0087
PO BOX 88, SPARTANBURG, SC 29304-0088
PO BOX 89, SPARTANBURG, SC 29304-0089
PO BOX 90, SPARTANBURG, SC 29304-0090
PO BOX 91, SPARTANBURG, SC 29304-0091
PO BOX 92, SPARTANBURG, SC 29304-0092
PO BOX 93, SPARTANBURG, SC 29304-0093
PO BOX 94, SPARTANBURG, SC 29304-0094
PO BOX 95, SPARTANBURG, SC 29304-0095
PO BOX 96, SPARTANBURG, SC 29304-0096
PO BOX 97, SPARTANBURG, SC 29304-0097
PO BOX 98, SPARTANBURG, SC 29304-0098
PO BOX 99, SPARTANBURG, SC 29304-0099
PO BOX 100, SPARTANBURG, SC 29304-0100
PO BOX 101, SPARTANBURG, SC 29304-0101
PO BOX 102, SPARTANBURG, SC 29304-0102
PO BOX 103, SPARTANBURG, SC 29304-0103
PO BOX 104, SPARTANBURG, SC 29304-0104
PO BOX 105, SPARTANBURG, SC 29304-0105
PO BOX 106, SPARTANBURG, SC 29304-0106
PO BOX 107, SPARTANBURG, SC 29304-0107
PO BOX 108, SPARTANBURG, SC 29304-0108
PO BOX 109, SPARTANBURG, SC 29304-0109
PO BOX 110, SPARTANBURG, SC 29304-0110
PO BOX 111, SPARTANBURG, SC 29304-0111
PO BOX 112, SPARTANBURG, SC 29304-0112
PO BOX 113, SPARTANBURG, SC 29304-0113
PO BOX 114, SPARTANBURG, SC 29304-0114
PO BOX 115, SPARTANBURG, SC 29304-0115
PO BOX 116, SPARTANBURG, SC 29304-0116
PO BOX 117, SPARTANBURG, SC 29304-0117
PO BOX 118, SPARTANBURG, SC 29304-0118
PO BOX 119, SPARTANBURG, SC 29304-0119
PO BOX 120, SPARTANBURG, SC 29304-0120
PO BOX 121, SPARTANBURG, SC 29304-0121
PO BOX 122, SPARTANBURG, SC 29304-0122
PO BOX 123, SPARTANBURG, SC 29304-0123
PO BOX 124, SPARTANBURG, SC 29304-0124
PO BOX 125, SPARTANBURG, SC 29304-0125
PO BOX 126, SPARTANBURG, SC 29304-0126
PO BOX 127, SPARTANBURG, SC 29304-0127
PO BOX 128, SPARTANBURG, SC 29304-0128
PO BOX 129, SPARTANBURG, SC 29304-0129
PO BOX 130, SPARTANBURG, SC 29304-0130
PO BOX 131, SPARTANBURG, SC 29304-0131
PO BOX 132, SPARTANBURG, SC 29304-0132
PO BOX 133, SPARTANBURG, SC 29304-0133
PO BOX 134, SPARTANBURG, SC 29304-0134
PO BOX 135, SPARTANBURG, SC 29304-0135
PO BOX 136, SPARTANBURG, SC 29304-0136
PO BOX 137, SPARTANBURG, SC 29304-0137
PO BOX 138, SPARTANBURG, SC 29304-0138
PO BOX 139, SPARTANBURG, SC 29304-0139
PO BOX 140, SPARTANBURG, SC 29304-0140
PO BOX 141, SPARTANBURG, SC 29304-0141
PO BOX 142, SPARTANBURG, SC 29304-0142
PO BOX 143, SPARTANBURG, SC 29304-0143
PO BOX 144, SPARTANBURG, SC 29304-0144
PO BOX 145, SPARTANBURG, SC 29304-0145
PO BOX 146, SPARTANBURG, SC 29304-0146
PO BOX 147, SPARTANBURG, SC 29304-0147
PO BOX 148, SPARTANBURG, SC 29304-0148
PO BOX 149, SPARTANBURG, SC 29304-0149
PO BOX 150, SPARTANBURG, SC 29304-0150
PO BOX 151, SPARTANBURG, SC 29304-0151
PO BOX 152, SPARTANBURG, SC 29304-0152
PO BOX 153, SPARTANBURG, SC 29304-0153
PO BOX 154, SPARTANBURG, SC 29304-0154
PO BOX 155, SPARTANBURG, SC 29304-0155
PO BOX 156, SPARTANBURG, SC 29304-0156
PO BOX 157, SPARTANBURG, SC 29304-0157
PO BOX 158, SPARTANBURG, SC 29304-0158
PO BOX 159, SPARTANBURG, SC 29304-0159
PO BOX 160, SPARTANBURG, SC 29304-0160
PO BOX 161, SPARTANBURG, SC 29304-0161
PO BOX 162, SPARTANBURG, SC 29304-0162
PO BOX 163, SPARTANBURG, SC 29304-0163
PO BOX 164, SPARTANBURG, SC 29304-0164
PO BOX 165, SPARTANBURG, SC 29304-0165
PO BOX 166, SPARTANBURG, SC 29304-0166
PO BOX 167, SPARTANBURG, SC 29304-0167
PO BOX 168, SPARTANBURG, SC 29304-0168
PO BOX 169, SPARTANBURG, SC 29304-0169
PO BOX 170, SPARTANBURG, SC 29304-0170
PO BOX 171, SPARTANBURG, SC 29304-0171
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