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, CARBONDALE, KS 66414-0001
PO BOX 2, CARBONDALE, KS 66414-0002
PO BOX 3, CARBONDALE, KS 66414-0003
PO BOX 4, CARBONDALE, KS 66414-0004
PO BOX 5, CARBONDALE, KS 66414-0005
PO BOX 6, CARBONDALE, KS 66414-0006
PO BOX 7, CARBONDALE, KS 66414-0007
PO BOX 8, CARBONDALE, KS 66414-0008
PO BOX 9, CARBONDALE, KS 66414-0009
PO BOX 10, CARBONDALE, KS 66414-0010
PO BOX 11, CARBONDALE, KS 66414-0011
PO BOX 12, CARBONDALE, KS 66414-0012
PO BOX 13, CARBONDALE, KS 66414-0013
PO BOX 14, CARBONDALE, KS 66414-0014
PO BOX 15, CARBONDALE, KS 66414-0015
PO BOX 16, CARBONDALE, KS 66414-0016
PO BOX 17, CARBONDALE, KS 66414-0017
PO BOX 18, CARBONDALE, KS 66414-0018
PO BOX 19, CARBONDALE, KS 66414-0019
PO BOX 20, CARBONDALE, KS 66414-0020
PO BOX 21, CARBONDALE, KS 66414-0021
PO BOX 22, CARBONDALE, KS 66414-0022
PO BOX 23, CARBONDALE, KS 66414-0023
PO BOX 24, CARBONDALE, KS 66414-0024
PO BOX 25, CARBONDALE, KS 66414-0025
PO BOX 26, CARBONDALE, KS 66414-0026
PO BOX 27, CARBONDALE, KS 66414-0027
PO BOX 28, CARBONDALE, KS 66414-0028
PO BOX 29, CARBONDALE, KS 66414-0029
PO BOX 30, CARBONDALE, KS 66414-0030
PO BOX 31, CARBONDALE, KS 66414-0031
PO BOX 32, CARBONDALE, KS 66414-0032
PO BOX 33, CARBONDALE, KS 66414-0033
PO BOX 34, CARBONDALE, KS 66414-0034
PO BOX 35, CARBONDALE, KS 66414-0035
PO BOX 36, CARBONDALE, KS 66414-0036
PO BOX 37, CARBONDALE, KS 66414-0037
PO BOX 38, CARBONDALE, KS 66414-0038
PO BOX 39, CARBONDALE, KS 66414-0039
PO BOX 40, CARBONDALE, KS 66414-0040
PO BOX 41, CARBONDALE, KS 66414-0041
PO BOX 42, CARBONDALE, KS 66414-0042
PO BOX 43, CARBONDALE, KS 66414-0043
PO BOX 44, CARBONDALE, KS 66414-0044
PO BOX 45, CARBONDALE, KS 66414-0045
PO BOX 46, CARBONDALE, KS 66414-0046
PO BOX 47, CARBONDALE, KS 66414-0047
PO BOX 48, CARBONDALE, KS 66414-0048
PO BOX 49, CARBONDALE, KS 66414-0049
PO BOX 50, CARBONDALE, KS 66414-0050
PO BOX 51, CARBONDALE, KS 66414-0051
PO BOX 52, CARBONDALE, KS 66414-0052
PO BOX 53, CARBONDALE, KS 66414-0053
PO BOX 54, CARBONDALE, KS 66414-0054
PO BOX 55, CARBONDALE, KS 66414-0055
PO BOX 56, CARBONDALE, KS 66414-0056
PO BOX 57, CARBONDALE, KS 66414-0057
PO BOX 58, CARBONDALE, KS 66414-0058
PO BOX 59, CARBONDALE, KS 66414-0059
PO BOX 60, CARBONDALE, KS 66414-0060
PO BOX 61, CARBONDALE, KS 66414-0061
PO BOX 62, CARBONDALE, KS 66414-0062
PO BOX 63, CARBONDALE, KS 66414-0063
PO BOX 64, CARBONDALE, KS 66414-0064
PO BOX 65, CARBONDALE, KS 66414-0065
PO BOX 66, CARBONDALE, KS 66414-0066
PO BOX 67, CARBONDALE, KS 66414-0067
PO BOX 68, CARBONDALE, KS 66414-0068
PO BOX 69, CARBONDALE, KS 66414-0069
PO BOX 70, CARBONDALE, KS 66414-0070
PO BOX 71, CARBONDALE, KS 66414-0071
PO BOX 72, CARBONDALE, KS 66414-0072
PO BOX 73, CARBONDALE, KS 66414-0073
PO BOX 74, CARBONDALE, KS 66414-0074
PO BOX 75, CARBONDALE, KS 66414-0075
PO BOX 76, CARBONDALE, KS 66414-0076
PO BOX 77, CARBONDALE, KS 66414-0077
PO BOX 78, CARBONDALE, KS 66414-0078
PO BOX 79, CARBONDALE, KS 66414-0079
PO BOX 80, CARBONDALE, KS 66414-0080
PO BOX 81, CARBONDALE, KS 66414-0081
PO BOX 82, CARBONDALE, KS 66414-0082
PO BOX 83, CARBONDALE, KS 66414-0083
PO BOX 84, CARBONDALE, KS 66414-0084
PO BOX 85, CARBONDALE, KS 66414-0085
PO BOX 86, CARBONDALE, KS 66414-0086
PO BOX 87, CARBONDALE, KS 66414-0087
PO BOX 88, CARBONDALE, KS 66414-0088
PO BOX 89, CARBONDALE, KS 66414-0089
PO BOX 90, CARBONDALE, KS 66414-0090
PO BOX 91, CARBONDALE, KS 66414-0091
PO BOX 92, CARBONDALE, KS 66414-0092
PO BOX 93, CARBONDALE, KS 66414-0093
PO BOX 94, CARBONDALE, KS 66414-0094
PO BOX 95, CARBONDALE, KS 66414-0095
PO BOX 96, CARBONDALE, KS 66414-0096
PO BOX 97, CARBONDALE, KS 66414-0097
PO BOX 98, CARBONDALE, KS 66414-0098
PO BOX 99, CARBONDALE, KS 66414-0099
PO BOX 100, CARBONDALE, KS 66414-0100
PO BOX 101, CARBONDALE, KS 66414-0101
PO BOX 102, CARBONDALE, KS 66414-0102
PO BOX 103, CARBONDALE, KS 66414-0103
PO BOX 104, CARBONDALE, KS 66414-0104
PO BOX 105, CARBONDALE, KS 66414-0105
PO BOX 106, CARBONDALE, KS 66414-0106
PO BOX 107, CARBONDALE, KS 66414-0107
PO BOX 108, CARBONDALE, KS 66414-0108
PO BOX 109, CARBONDALE, KS 66414-0109
PO BOX 110, CARBONDALE, KS 66414-0110
PO BOX 111, CARBONDALE, KS 66414-0111
PO BOX 112, CARBONDALE, KS 66414-0112
PO BOX 113, CARBONDALE, KS 66414-0113
PO BOX 114, CARBONDALE, KS 66414-0114
PO BOX 115, CARBONDALE, KS 66414-0115
PO BOX 116, CARBONDALE, KS 66414-0116
PO BOX 117, CARBONDALE, KS 66414-0117
PO BOX 118, CARBONDALE, KS 66414-0118
PO BOX 119, CARBONDALE, KS 66414-0119
PO BOX 120, CARBONDALE, KS 66414-0120
PO BOX 121, CARBONDALE, KS 66414-0121
PO BOX 122, CARBONDALE, KS 66414-0122
PO BOX 123, CARBONDALE, KS 66414-0123
PO BOX 124, CARBONDALE, KS 66414-0124
PO BOX 125, CARBONDALE, KS 66414-0125
PO BOX 126, CARBONDALE, KS 66414-0126
PO BOX 127, CARBONDALE, KS 66414-0127
PO BOX 128, CARBONDALE, KS 66414-0128
PO BOX 129, CARBONDALE, KS 66414-0129
PO BOX 130, CARBONDALE, KS 66414-0130
PO BOX 131, CARBONDALE, KS 66414-0131
PO BOX 132, CARBONDALE, KS 66414-0132
PO BOX 133, CARBONDALE, KS 66414-0133
PO BOX 134, CARBONDALE, KS 66414-0134
PO BOX 135, CARBONDALE, KS 66414-0135
PO BOX 136, CARBONDALE, KS 66414-0136
PO BOX 137, CARBONDALE, KS 66414-0137
PO BOX 138, CARBONDALE, KS 66414-0138
PO BOX 139, CARBONDALE, KS 66414-0139
PO BOX 140, CARBONDALE, KS 66414-0140
PO BOX 141, CARBONDALE, KS 66414-0141
PO BOX 142, CARBONDALE, KS 66414-0142
PO BOX 143, CARBONDALE, KS 66414-0143
PO BOX 144, CARBONDALE, KS 66414-0144
PO BOX 145, CARBONDALE, KS 66414-0145
PO BOX 146, CARBONDALE, KS 66414-0146
PO BOX 147, CARBONDALE, KS 66414-0147
PO BOX 148, CARBONDALE, KS 66414-0148
PO BOX 149, CARBONDALE, KS 66414-0149
PO BOX 150, CARBONDALE, KS 66414-0150
PO BOX 151, CARBONDALE, KS 66414-0151
PO BOX 152, CARBONDALE, KS 66414-0152
PO BOX 153, CARBONDALE, KS 66414-0153
PO BOX 154, CARBONDALE, KS 66414-0154
PO BOX 155, CARBONDALE, KS 66414-0155
PO BOX 156, CARBONDALE, KS 66414-0156
PO BOX 157, CARBONDALE, KS 66414-0157
PO BOX 158, CARBONDALE, KS 66414-0158
PO BOX 159, CARBONDALE, KS 66414-0159
PO BOX 160, CARBONDALE, KS 66414-0160
PO BOX 161, CARBONDALE, KS 66414-0161
PO BOX 162, CARBONDALE, KS 66414-0162
PO BOX 163, CARBONDALE, KS 66414-0163
PO BOX 164, CARBONDALE, KS 66414-0164
PO BOX 165, CARBONDALE, KS 66414-0165
PO BOX 166, CARBONDALE, KS 66414-0166
PO BOX 167, CARBONDALE, KS 66414-0167
PO BOX 168, CARBONDALE, KS 66414-0168
PO BOX 169, CARBONDALE, KS 66414-0169
PO BOX 170, CARBONDALE, KS 66414-0170
PO BOX 171, CARBONDALE, KS 66414-0171
PO BOX 172, CARBONDALE, KS 66414-0172
PO BOX 173, CARBONDALE, KS 66414-0173
PO BOX 174, CARBONDALE, KS 66414-0174
PO BOX 175, CARBONDALE, KS 66414-0175
PO BOX 176, CARBONDALE, KS 66414-0176
PO BOX 177, CARBONDALE, KS 66414-0177
PO BOX 178, CARBONDALE, KS 66414-0178
PO BOX 179, CARBONDALE, KS 66414-0179
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