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 11, BARNES CITY, IA 50027-0011
PO BOX 12, BARNES CITY, IA 50027-0012
PO BOX 13, BARNES CITY, IA 50027-0013
PO BOX 14, BARNES CITY, IA 50027-0014
PO BOX 15, BARNES CITY, IA 50027-0015
PO BOX 16, BARNES CITY, IA 50027-0016
PO BOX 17, BARNES CITY, IA 50027-0017
PO BOX 18, BARNES CITY, IA 50027-0018
PO BOX 19, BARNES CITY, IA 50027-0019
PO BOX 20, BARNES CITY, IA 50027-0020
PO BOX 21, BARNES CITY, IA 50027-0021
PO BOX 22, BARNES CITY, IA 50027-0022
PO BOX 23, BARNES CITY, IA 50027-0023
PO BOX 24, BARNES CITY, IA 50027-0024
PO BOX 25, BARNES CITY, IA 50027-0025
PO BOX 26, BARNES CITY, IA 50027-0026
PO BOX 27, BARNES CITY, IA 50027-0027
PO BOX 28, BARNES CITY, IA 50027-0028
PO BOX 29, BARNES CITY, IA 50027-0029
PO BOX 30, BARNES CITY, IA 50027-0030
PO BOX 31, BARNES CITY, IA 50027-0031
PO BOX 32, BARNES CITY, IA 50027-0032
PO BOX 33, BARNES CITY, IA 50027-0033
PO BOX 34, BARNES CITY, IA 50027-0034
PO BOX 35, BARNES CITY, IA 50027-0035
PO BOX 36, BARNES CITY, IA 50027-0036
PO BOX 37, BARNES CITY, IA 50027-0037
PO BOX 38, BARNES CITY, IA 50027-0038
PO BOX 39, BARNES CITY, IA 50027-0039
PO BOX 40, BARNES CITY, IA 50027-0040
PO BOX 41, BARNES CITY, IA 50027-0041
PO BOX 42, BARNES CITY, IA 50027-0042
PO BOX 43, BARNES CITY, IA 50027-0043
PO BOX 44, BARNES CITY, IA 50027-0044
PO BOX 45, BARNES CITY, IA 50027-0045
PO BOX 46, BARNES CITY, IA 50027-0046
PO BOX 47, BARNES CITY, IA 50027-0047
PO BOX 48, BARNES CITY, IA 50027-0048
PO BOX 49, BARNES CITY, IA 50027-0049
PO BOX 50, BARNES CITY, IA 50027-0050
PO BOX 51, BARNES CITY, IA 50027-0051
PO BOX 52, BARNES CITY, IA 50027-0052
PO BOX 53, BARNES CITY, IA 50027-0053
PO BOX 54, BARNES CITY, IA 50027-0054
PO BOX 55, BARNES CITY, IA 50027-0055
PO BOX 56, BARNES CITY, IA 50027-0056
PO BOX 57, BARNES CITY, IA 50027-0057
PO BOX 58, BARNES CITY, IA 50027-0058
PO BOX 59, BARNES CITY, IA 50027-0059
PO BOX 60, BARNES CITY, IA 50027-0060
PO BOX 61, BARNES CITY, IA 50027-0061
PO BOX 62, BARNES CITY, IA 50027-0062
PO BOX 63, BARNES CITY, IA 50027-0063
PO BOX 64, BARNES CITY, IA 50027-0064
PO BOX 65, BARNES CITY, IA 50027-0065
PO BOX 66, BARNES CITY, IA 50027-0066
PO BOX 67, BARNES CITY, IA 50027-0067
PO BOX 68, BARNES CITY, IA 50027-0068
PO BOX 69, BARNES CITY, IA 50027-0069
PO BOX 70, BARNES CITY, IA 50027-0070
PO BOX 71, BARNES CITY, IA 50027-0071
PO BOX 72, BARNES CITY, IA 50027-0072
PO BOX 73, BARNES CITY, IA 50027-0073
PO BOX 74, BARNES CITY, IA 50027-0074
PO BOX 75, BARNES CITY, IA 50027-0075
PO BOX 76, BARNES CITY, IA 50027-0076
PO BOX 77, BARNES CITY, IA 50027-0077
PO BOX 78, BARNES CITY, IA 50027-0078
PO BOX 79, BARNES CITY, IA 50027-0079
PO BOX 80, BARNES CITY, IA 50027-0080
PO BOX 81, BARNES CITY, IA 50027-0081
PO BOX 82, BARNES CITY, IA 50027-0082
PO BOX 83, BARNES CITY, IA 50027-0083
PO BOX 84, BARNES CITY, IA 50027-0084
PO BOX 85, BARNES CITY, IA 50027-0085
PO BOX 86, BARNES CITY, IA 50027-0086
PO BOX 87, BARNES CITY, IA 50027-0087
PO BOX 88, BARNES CITY, IA 50027-0088
PO BOX 89, BARNES CITY, IA 50027-0089
PO BOX 90, BARNES CITY, IA 50027-0090
PO BOX 91, BARNES CITY, IA 50027-0091
PO BOX 92, BARNES CITY, IA 50027-0092
PO BOX 93, BARNES CITY, IA 50027-0093
PO BOX 94, BARNES CITY, IA 50027-0094
PO BOX 95, BARNES CITY, IA 50027-0095
PO BOX 96, BARNES CITY, IA 50027-0096
PO BOX 97, BARNES CITY, IA 50027-0097
PO BOX 98, BARNES CITY, IA 50027-0098
PO BOX 99, BARNES CITY, IA 50027-0099
PO BOX 100, BARNES CITY, IA 50027-0100
PO BOX 101, BARNES CITY, IA 50027-0101
PO BOX 102, BARNES CITY, IA 50027-0102
PO BOX 103, BARNES CITY, IA 50027-0103
PO BOX 104, BARNES CITY, IA 50027-0104
PO BOX 105, BARNES CITY, IA 50027-0105
PO BOX 106, BARNES CITY, IA 50027-0106
PO BOX 107, BARNES CITY, IA 50027-0107
PO BOX 108, BARNES CITY, IA 50027-0108
PO BOX 109, BARNES CITY, IA 50027-0109
PO BOX 110, BARNES CITY, IA 50027-0110
PO BOX 111, BARNES CITY, IA 50027-0111
PO BOX 112, BARNES CITY, IA 50027-0112
PO BOX 113, BARNES CITY, IA 50027-0113
PO BOX 114, BARNES CITY, IA 50027-0114
PO BOX 115, BARNES CITY, IA 50027-0115
PO BOX 116, BARNES CITY, IA 50027-0116
PO BOX 117, BARNES CITY, IA 50027-0117
PO BOX 118, BARNES CITY, IA 50027-0118
PO BOX 119, BARNES CITY, IA 50027-0119
PO BOX 120, BARNES CITY, IA 50027-0120
PO BOX 121, BARNES CITY, IA 50027-0121
PO BOX 122, BARNES CITY, IA 50027-0122
PO BOX 123, BARNES CITY, IA 50027-0123
PO BOX 124, BARNES CITY, IA 50027-0124
PO BOX 125, BARNES CITY, IA 50027-0125
PO BOX 126, BARNES CITY, IA 50027-0126
PO BOX 127, BARNES CITY, IA 50027-0127
PO BOX 128, BARNES CITY, IA 50027-0128
PO BOX 129, BARNES CITY, IA 50027-0129
PO BOX 130, BARNES CITY, IA 50027-0130
PO BOX 131, BARNES CITY, IA 50027-0131
PO BOX 132, BARNES CITY, IA 50027-0132
PO BOX 133, BARNES CITY, IA 50027-0133
PO BOX 134, BARNES CITY, IA 50027-0134
PO BOX 135, BARNES CITY, IA 50027-0135
PO BOX 136, BARNES CITY, IA 50027-0136
PO BOX 137, BARNES CITY, IA 50027-0137
PO BOX 138, BARNES CITY, IA 50027-0138
PO BOX 139, BARNES CITY, IA 50027-0139
PO BOX 140, BARNES CITY, IA 50027-0140
PO BOX 141, BARNES CITY, IA 50027-0141
PO BOX 142, BARNES CITY, IA 50027-0142
PO BOX 143, BARNES CITY, IA 50027-0143
PO BOX 144, BARNES CITY, IA 50027-0144
PO BOX 145, BARNES CITY, IA 50027-0145
PO BOX 146, BARNES CITY, IA 50027-0146
PO BOX 147, BARNES CITY, IA 50027-0147
PO BOX 148, BARNES CITY, IA 50027-0148
PO BOX 149, BARNES CITY, IA 50027-0149
PO BOX 150, BARNES CITY, IA 50027-0150
PO BOX 151, BARNES CITY, IA 50027-0151
PO BOX 152, BARNES CITY, IA 50027-0152
PO BOX 153, BARNES CITY, IA 50027-0153
PO BOX 154, BARNES CITY, IA 50027-0154
PO BOX 155, BARNES CITY, IA 50027-0155
PO BOX 156, BARNES CITY, IA 50027-0156
PO BOX 157, BARNES CITY, IA 50027-0157
PO BOX 158, BARNES CITY, IA 50027-0158
PO BOX 159, BARNES CITY, IA 50027-0159
PO BOX 160, BARNES CITY, IA 50027-0160
PO BOX 161, BARNES CITY, IA 50027-0161
PO BOX 162, BARNES CITY, IA 50027-0162
PO BOX 163, BARNES CITY, IA 50027-0163
PO BOX 164, BARNES CITY, IA 50027-0164
PO BOX 165, BARNES CITY, IA 50027-0165
PO BOX 166, BARNES CITY, IA 50027-0166
PO BOX 167, BARNES CITY, IA 50027-0167
PO BOX 168, BARNES CITY, IA 50027-0168
PO BOX 169, BARNES CITY, IA 50027-0169
PO BOX 170, BARNES CITY, IA 50027-0170
PO BOX 171, BARNES CITY, IA 50027-0171
PO BOX 172, BARNES CITY, IA 50027-0172
PO BOX 173, BARNES CITY, IA 50027-0173
PO BOX 174, BARNES CITY, IA 50027-0174
PO BOX 175, BARNES CITY, IA 50027-0175
PO BOX 176, BARNES CITY, IA 50027-0176
PO BOX 177, BARNES CITY, IA 50027-0177
PO BOX 178, BARNES CITY, IA 50027-0178
PO BOX 179, BARNES CITY, IA 50027-0179
PO BOX 180, BARNES CITY, IA 50027-0180
PO BOX 181, BARNES CITY, IA 50027-0181
PO BOX 182, BARNES CITY, IA 50027-0182
PO BOX 183, BARNES CITY, IA 50027-0183
PO BOX 184, BARNES CITY, IA 50027-0184
PO BOX 185, BARNES CITY, IA 50027-0185
PO BOX 186, BARNES CITY, IA 50027-0186
PO BOX 187, BARNES CITY, IA 50027-0187
PO BOX 188, BARNES CITY, IA 50027-0188
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