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, RINGSTED, IA 50578-0001
PO BOX 2, RINGSTED, IA 50578-0002
PO BOX 3, RINGSTED, IA 50578-0003
PO BOX 4, RINGSTED, IA 50578-0004
PO BOX 5, RINGSTED, IA 50578-0005
PO BOX 6, RINGSTED, IA 50578-0006
PO BOX 7, RINGSTED, IA 50578-0007
PO BOX 8, RINGSTED, IA 50578-0008
PO BOX 9, RINGSTED, IA 50578-0009
PO BOX 10, RINGSTED, IA 50578-0010
PO BOX 11, RINGSTED, IA 50578-0011
PO BOX 12, RINGSTED, IA 50578-0012
PO BOX 13, RINGSTED, IA 50578-0013
PO BOX 14, RINGSTED, IA 50578-0014
PO BOX 15, RINGSTED, IA 50578-0015
PO BOX 16, RINGSTED, IA 50578-0016
PO BOX 17, RINGSTED, IA 50578-0017
PO BOX 18, RINGSTED, IA 50578-0018
PO BOX 19, RINGSTED, IA 50578-0019
PO BOX 20, RINGSTED, IA 50578-0020
PO BOX 21, RINGSTED, IA 50578-0021
PO BOX 22, RINGSTED, IA 50578-0022
PO BOX 23, RINGSTED, IA 50578-0023
PO BOX 24, RINGSTED, IA 50578-0024
PO BOX 25, RINGSTED, IA 50578-0025
PO BOX 26, RINGSTED, IA 50578-0026
PO BOX 27, RINGSTED, IA 50578-0027
PO BOX 28, RINGSTED, IA 50578-0028
PO BOX 29, RINGSTED, IA 50578-0029
PO BOX 30, RINGSTED, IA 50578-0030
PO BOX 31, RINGSTED, IA 50578-0031
PO BOX 32, RINGSTED, IA 50578-0032
PO BOX 33, RINGSTED, IA 50578-0033
PO BOX 34, RINGSTED, IA 50578-0034
PO BOX 35, RINGSTED, IA 50578-0035
PO BOX 36, RINGSTED, IA 50578-0036
PO BOX 37, RINGSTED, IA 50578-0037
PO BOX 38, RINGSTED, IA 50578-0038
PO BOX 39, RINGSTED, IA 50578-0039
PO BOX 40, RINGSTED, IA 50578-0040
PO BOX 41, RINGSTED, IA 50578-0041
PO BOX 42, RINGSTED, IA 50578-0042
PO BOX 43, RINGSTED, IA 50578-0043
PO BOX 44, RINGSTED, IA 50578-0044
PO BOX 45, RINGSTED, IA 50578-0045
PO BOX 46, RINGSTED, IA 50578-0046
PO BOX 47, RINGSTED, IA 50578-0047
PO BOX 48, RINGSTED, IA 50578-0048
PO BOX 49, RINGSTED, IA 50578-0049
PO BOX 50, RINGSTED, IA 50578-0050
PO BOX 51, RINGSTED, IA 50578-0051
PO BOX 52, RINGSTED, IA 50578-0052
PO BOX 53, RINGSTED, IA 50578-0053
PO BOX 54, RINGSTED, IA 50578-0054
PO BOX 55, RINGSTED, IA 50578-0055
PO BOX 56, RINGSTED, IA 50578-0056
PO BOX 57, RINGSTED, IA 50578-0057
PO BOX 58, RINGSTED, IA 50578-0058
PO BOX 59, RINGSTED, IA 50578-0059
PO BOX 60, RINGSTED, IA 50578-0060
PO BOX 61, RINGSTED, IA 50578-0061
PO BOX 62, RINGSTED, IA 50578-0062
PO BOX 63, RINGSTED, IA 50578-0063
PO BOX 64, RINGSTED, IA 50578-0064
PO BOX 65, RINGSTED, IA 50578-0065
PO BOX 66, RINGSTED, IA 50578-0066
PO BOX 67, RINGSTED, IA 50578-0067
PO BOX 68, RINGSTED, IA 50578-0068
PO BOX 69, RINGSTED, IA 50578-0069
PO BOX 70, RINGSTED, IA 50578-0070
PO BOX 71, RINGSTED, IA 50578-0071
PO BOX 72, RINGSTED, IA 50578-0072
PO BOX 73, RINGSTED, IA 50578-0073
PO BOX 74, RINGSTED, IA 50578-0074
PO BOX 75, RINGSTED, IA 50578-0075
PO BOX 76, RINGSTED, IA 50578-0076
PO BOX 77, RINGSTED, IA 50578-0077
PO BOX 78, RINGSTED, IA 50578-0078
PO BOX 79, RINGSTED, IA 50578-0079
PO BOX 80, RINGSTED, IA 50578-0080
PO BOX 81, RINGSTED, IA 50578-0081
PO BOX 82, RINGSTED, IA 50578-0082
PO BOX 83, RINGSTED, IA 50578-0083
PO BOX 84, RINGSTED, IA 50578-0084
PO BOX 85, RINGSTED, IA 50578-0085
PO BOX 86, RINGSTED, IA 50578-0086
PO BOX 87, RINGSTED, IA 50578-0087
PO BOX 88, RINGSTED, IA 50578-0088
PO BOX 89, RINGSTED, IA 50578-0089
PO BOX 90, RINGSTED, IA 50578-0090
PO BOX 91, RINGSTED, IA 50578-0091
PO BOX 92, RINGSTED, IA 50578-0092
PO BOX 93, RINGSTED, IA 50578-0093
PO BOX 94, RINGSTED, IA 50578-0094
PO BOX 95, RINGSTED, IA 50578-0095
PO BOX 96, RINGSTED, IA 50578-0096
PO BOX 97, RINGSTED, IA 50578-0097
PO BOX 98, RINGSTED, IA 50578-0098
PO BOX 99, RINGSTED, IA 50578-0099
PO BOX 100, RINGSTED, IA 50578-0100
PO BOX 101, RINGSTED, IA 50578-0101
PO BOX 102, RINGSTED, IA 50578-0102
PO BOX 103, RINGSTED, IA 50578-0103
PO BOX 104, RINGSTED, IA 50578-0104
PO BOX 105, RINGSTED, IA 50578-0105
PO BOX 106, RINGSTED, IA 50578-0106
PO BOX 107, RINGSTED, IA 50578-0107
PO BOX 108, RINGSTED, IA 50578-0108
PO BOX 109, RINGSTED, IA 50578-0109
PO BOX 110, RINGSTED, IA 50578-0110
PO BOX 111, RINGSTED, IA 50578-0111
PO BOX 112, RINGSTED, IA 50578-0112
PO BOX 113, RINGSTED, IA 50578-0113
PO BOX 114, RINGSTED, IA 50578-0114
PO BOX 115, RINGSTED, IA 50578-0115
PO BOX 116, RINGSTED, IA 50578-0116
PO BOX 117, RINGSTED, IA 50578-0117
PO BOX 118, RINGSTED, IA 50578-0118
PO BOX 119, RINGSTED, IA 50578-0119
PO BOX 120, RINGSTED, IA 50578-0120
PO BOX 121, RINGSTED, IA 50578-0121
PO BOX 122, RINGSTED, IA 50578-0122
PO BOX 123, RINGSTED, IA 50578-0123
PO BOX 124, RINGSTED, IA 50578-0124
PO BOX 125, RINGSTED, IA 50578-0125
PO BOX 126, RINGSTED, IA 50578-0126
PO BOX 127, RINGSTED, IA 50578-0127
PO BOX 128, RINGSTED, IA 50578-0128
PO BOX 129, RINGSTED, IA 50578-0129
PO BOX 130, RINGSTED, IA 50578-0130
PO BOX 131, RINGSTED, IA 50578-0131
PO BOX 132, RINGSTED, IA 50578-0132
PO BOX 133, RINGSTED, IA 50578-0133
PO BOX 134, RINGSTED, IA 50578-0134
PO BOX 135, RINGSTED, IA 50578-0135
PO BOX 136, RINGSTED, IA 50578-0136
PO BOX 137, RINGSTED, IA 50578-0137
PO BOX 138, RINGSTED, IA 50578-0138
PO BOX 139, RINGSTED, IA 50578-0139
PO BOX 140, RINGSTED, IA 50578-0140
PO BOX 141, RINGSTED, IA 50578-0141
PO BOX 142, RINGSTED, IA 50578-0142
PO BOX 143, RINGSTED, IA 50578-0143
PO BOX 144, RINGSTED, IA 50578-0144
PO BOX 145, RINGSTED, IA 50578-0145
PO BOX 146, RINGSTED, IA 50578-0146
PO BOX 147, RINGSTED, IA 50578-0147
PO BOX 148, RINGSTED, IA 50578-0148
PO BOX 149, RINGSTED, IA 50578-0149
PO BOX 150, RINGSTED, IA 50578-0150
PO BOX 151, RINGSTED, IA 50578-0151
PO BOX 152, RINGSTED, IA 50578-0152
PO BOX 153, RINGSTED, IA 50578-0153
PO BOX 154, RINGSTED, IA 50578-0154
PO BOX 155, RINGSTED, IA 50578-0155
PO BOX 156, RINGSTED, IA 50578-0156
PO BOX 157, RINGSTED, IA 50578-0157
PO BOX 158, RINGSTED, IA 50578-0158
PO BOX 159, RINGSTED, IA 50578-0159
PO BOX 160, RINGSTED, IA 50578-0160
PO BOX 161, RINGSTED, IA 50578-0161
PO BOX 162, RINGSTED, IA 50578-0162
PO BOX 163, RINGSTED, IA 50578-0163
PO BOX 164, RINGSTED, IA 50578-0164
PO BOX 165, RINGSTED, IA 50578-0165
PO BOX 166, RINGSTED, IA 50578-0166
PO BOX 167, RINGSTED, IA 50578-0167
PO BOX 168, RINGSTED, IA 50578-0168
PO BOX 169, RINGSTED, IA 50578-0169
PO BOX 170, RINGSTED, IA 50578-0170
PO BOX 171, RINGSTED, IA 50578-0171
PO BOX 172, RINGSTED, IA 50578-0172
PO BOX 173, RINGSTED, IA 50578-0173
PO BOX 174, RINGSTED, IA 50578-0174
PO BOX 175, RINGSTED, IA 50578-0175
PO BOX 176, RINGSTED, IA 50578-0176
PO BOX 177, RINGSTED, IA 50578-0177
PO BOX 178, RINGSTED, IA 50578-0178
PO BOX 179, RINGSTED, IA 50578-0179
PO BOX 180, RINGSTED, IA 50578-0180
PO BOX 181, RINGSTED, IA 50578-0181
PO BOX 182, RINGSTED, IA 50578-0182
PO BOX 183, RINGSTED, IA 50578-0183
PO BOX 184, RINGSTED, IA 50578-0184
PO BOX 185, RINGSTED, IA 50578-0185
PO BOX 186, RINGSTED, IA 50578-0186
PO BOX 187, RINGSTED, IA 50578-0187
PO BOX 188, RINGSTED, IA 50578-0188
PO BOX 189, RINGSTED, IA 50578-0189
PO BOX 190, RINGSTED, IA 50578-0190
PO BOX 191, RINGSTED, IA 50578-0191
PO BOX 192, RINGSTED, IA 50578-0192
PO BOX 193, RINGSTED, IA 50578-0193
PO BOX 194, RINGSTED, IA 50578-0194
PO BOX 195, RINGSTED, IA 50578-0195
PO BOX 196, RINGSTED, IA 50578-0196
PO BOX 197, RINGSTED, IA 50578-0197
PO BOX 198, RINGSTED, IA 50578-0198
PO BOX 199, RINGSTED, IA 50578-0199
PO BOX 200, RINGSTED, IA 50578-0200
PO BOX 201, RINGSTED, IA 50578-0201
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