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, MIDDLE AMANA, IA 52307-0001
PO BOX 2, MIDDLE AMANA, IA 52307-0002
PO BOX 3, MIDDLE AMANA, IA 52307-0003
PO BOX 4, MIDDLE AMANA, IA 52307-0004
PO BOX 5, MIDDLE AMANA, IA 52307-0005
PO BOX 6, MIDDLE AMANA, IA 52307-0006
PO BOX 7, MIDDLE AMANA, IA 52307-0007
PO BOX 8, MIDDLE AMANA, IA 52307-0008
PO BOX 9, MIDDLE AMANA, IA 52307-0009
PO BOX 10, MIDDLE AMANA, IA 52307-0010
PO BOX 11, MIDDLE AMANA, IA 52307-0011
PO BOX 12, MIDDLE AMANA, IA 52307-0012
PO BOX 13, MIDDLE AMANA, IA 52307-0013
PO BOX 14, MIDDLE AMANA, IA 52307-0014
PO BOX 15, MIDDLE AMANA, IA 52307-0015
PO BOX 16, MIDDLE AMANA, IA 52307-0016
PO BOX 17, MIDDLE AMANA, IA 52307-0017
PO BOX 18, MIDDLE AMANA, IA 52307-0018
PO BOX 19, MIDDLE AMANA, IA 52307-0019
PO BOX 20, MIDDLE AMANA, IA 52307-0020
PO BOX 21, MIDDLE AMANA, IA 52307-0021
PO BOX 22, MIDDLE AMANA, IA 52307-0022
PO BOX 23, MIDDLE AMANA, IA 52307-0023
PO BOX 24, MIDDLE AMANA, IA 52307-0024
PO BOX 25, MIDDLE AMANA, IA 52307-0025
PO BOX 26, MIDDLE AMANA, IA 52307-0026
PO BOX 27, MIDDLE AMANA, IA 52307-0027
PO BOX 28, MIDDLE AMANA, IA 52307-0028
PO BOX 29, MIDDLE AMANA, IA 52307-0029
PO BOX 30, MIDDLE AMANA, IA 52307-0030
PO BOX 31, MIDDLE AMANA, IA 52307-0031
PO BOX 32, MIDDLE AMANA, IA 52307-0032
PO BOX 33, MIDDLE AMANA, IA 52307-0033
PO BOX 34, MIDDLE AMANA, IA 52307-0034
PO BOX 35, MIDDLE AMANA, IA 52307-0035
PO BOX 36, MIDDLE AMANA, IA 52307-0036
PO BOX 37, MIDDLE AMANA, IA 52307-0037
PO BOX 38, MIDDLE AMANA, IA 52307-0038
PO BOX 39, MIDDLE AMANA, IA 52307-0039
PO BOX 40, MIDDLE AMANA, IA 52307-0040
PO BOX 41, MIDDLE AMANA, IA 52307-0041
PO BOX 42, MIDDLE AMANA, IA 52307-0042
PO BOX 43, MIDDLE AMANA, IA 52307-0043
PO BOX 44, MIDDLE AMANA, IA 52307-0044
PO BOX 45, MIDDLE AMANA, IA 52307-0045
PO BOX 46, MIDDLE AMANA, IA 52307-0046
PO BOX 47, MIDDLE AMANA, IA 52307-0047
PO BOX 48, MIDDLE AMANA, IA 52307-0048
PO BOX 49, MIDDLE AMANA, IA 52307-0049
PO BOX 50, MIDDLE AMANA, IA 52307-0050
PO BOX 51, MIDDLE AMANA, IA 52307-0051
PO BOX 52, MIDDLE AMANA, IA 52307-0052
PO BOX 53, MIDDLE AMANA, IA 52307-0053
PO BOX 54, MIDDLE AMANA, IA 52307-0054
PO BOX 55, MIDDLE AMANA, IA 52307-0055
PO BOX 56, MIDDLE AMANA, IA 52307-0056
PO BOX 57, MIDDLE AMANA, IA 52307-0057
PO BOX 58, MIDDLE AMANA, IA 52307-0058
PO BOX 59, MIDDLE AMANA, IA 52307-0059
PO BOX 60, MIDDLE AMANA, IA 52307-0060
PO BOX 61, MIDDLE AMANA, IA 52307-0061
PO BOX 62, MIDDLE AMANA, IA 52307-0062
PO BOX 63, MIDDLE AMANA, IA 52307-0063
PO BOX 64, MIDDLE AMANA, IA 52307-0064
PO BOX 65, MIDDLE AMANA, IA 52307-0065
PO BOX 66, MIDDLE AMANA, IA 52307-0066
PO BOX 67, MIDDLE AMANA, IA 52307-0067
PO BOX 68, MIDDLE AMANA, IA 52307-0068
PO BOX 69, MIDDLE AMANA, IA 52307-0069
PO BOX 70, MIDDLE AMANA, IA 52307-0070
PO BOX 71, MIDDLE AMANA, IA 52307-0071
PO BOX 72, MIDDLE AMANA, IA 52307-0072
PO BOX 73, MIDDLE AMANA, IA 52307-0073
PO BOX 74, MIDDLE AMANA, IA 52307-0074
PO BOX 75, MIDDLE AMANA, IA 52307-0075
PO BOX 76, MIDDLE AMANA, IA 52307-0076
PO BOX 77, MIDDLE AMANA, IA 52307-0077
PO BOX 78, MIDDLE AMANA, IA 52307-0078
PO BOX 79, MIDDLE AMANA, IA 52307-0079
PO BOX 80, MIDDLE AMANA, IA 52307-0080
PO BOX 81, MIDDLE AMANA, IA 52307-0081
PO BOX 82, MIDDLE AMANA, IA 52307-0082
PO BOX 83, MIDDLE AMANA, IA 52307-0083
PO BOX 84, MIDDLE AMANA, IA 52307-0084
PO BOX 85, MIDDLE AMANA, IA 52307-0085
PO BOX 86, MIDDLE AMANA, IA 52307-0086
PO BOX 87, MIDDLE AMANA, IA 52307-0087
PO BOX 88, MIDDLE AMANA, IA 52307-0088
PO BOX 89, MIDDLE AMANA, IA 52307-0089
PO BOX 90, MIDDLE AMANA, IA 52307-0090
PO BOX 91, MIDDLE AMANA, IA 52307-0091
PO BOX 92, MIDDLE AMANA, IA 52307-0092
PO BOX 93, MIDDLE AMANA, IA 52307-0093
PO BOX 94, MIDDLE AMANA, IA 52307-0094
PO BOX 95, MIDDLE AMANA, IA 52307-0095
PO BOX 96, MIDDLE AMANA, IA 52307-0096
PO BOX 97, MIDDLE AMANA, IA 52307-0097
PO BOX 98, MIDDLE AMANA, IA 52307-0098
PO BOX 99, MIDDLE AMANA, IA 52307-0099
PO BOX 100, MIDDLE AMANA, IA 52307-0100
PO BOX 101, MIDDLE AMANA, IA 52307-0101
PO BOX 102, MIDDLE AMANA, IA 52307-0102
PO BOX 103, MIDDLE AMANA, IA 52307-0103
PO BOX 104, MIDDLE AMANA, IA 52307-0104
PO BOX 105, MIDDLE AMANA, IA 52307-0105
PO BOX 106, MIDDLE AMANA, IA 52307-0106
PO BOX 107, MIDDLE AMANA, IA 52307-0107
PO BOX 108, MIDDLE AMANA, IA 52307-0108
PO BOX 109, MIDDLE AMANA, IA 52307-0109
PO BOX 110, MIDDLE AMANA, IA 52307-0110
PO BOX 111, MIDDLE AMANA, IA 52307-0111
PO BOX 112, MIDDLE AMANA, IA 52307-0112
PO BOX 113, MIDDLE AMANA, IA 52307-0113
PO BOX 114, MIDDLE AMANA, IA 52307-0114
PO BOX 115, MIDDLE AMANA, IA 52307-0115
PO BOX 116, MIDDLE AMANA, IA 52307-0116
PO BOX 117, MIDDLE AMANA, IA 52307-0117
PO BOX 118, MIDDLE AMANA, IA 52307-0118
PO BOX 119, MIDDLE AMANA, IA 52307-0119
PO BOX 120, MIDDLE AMANA, IA 52307-0120
PO BOX 121, MIDDLE AMANA, IA 52307-0121
PO BOX 122, MIDDLE AMANA, IA 52307-0122
PO BOX 123, MIDDLE AMANA, IA 52307-0123
PO BOX 124, MIDDLE AMANA, IA 52307-0124
PO BOX 125, MIDDLE AMANA, IA 52307-0125
PO BOX 126, MIDDLE AMANA, IA 52307-0126
PO BOX 127, MIDDLE AMANA, IA 52307-0127
PO BOX 128, MIDDLE AMANA, IA 52307-0128
PO BOX 129, MIDDLE AMANA, IA 52307-0129
PO BOX 130, MIDDLE AMANA, IA 52307-0130
PO BOX 131, MIDDLE AMANA, IA 52307-0131
PO BOX 132, MIDDLE AMANA, IA 52307-0132
PO BOX 133, MIDDLE AMANA, IA 52307-0133
PO BOX 134, MIDDLE AMANA, IA 52307-0134
PO BOX 135, MIDDLE AMANA, IA 52307-0135
PO BOX 136, MIDDLE AMANA, IA 52307-0136
PO BOX 137, MIDDLE AMANA, IA 52307-0137
PO BOX 138, MIDDLE AMANA, IA 52307-0138
PO BOX 139, MIDDLE AMANA, IA 52307-0139
PO BOX 140, MIDDLE AMANA, IA 52307-0140
PO BOX 141, MIDDLE AMANA, IA 52307-0141
PO BOX 142, MIDDLE AMANA, IA 52307-0142
PO BOX 143, MIDDLE AMANA, IA 52307-0143
PO BOX 144, MIDDLE AMANA, IA 52307-0144
PO BOX 145, MIDDLE AMANA, IA 52307-0145
PO BOX 146, MIDDLE AMANA, IA 52307-0146
PO BOX 147, MIDDLE AMANA, IA 52307-0147
PO BOX 148, MIDDLE AMANA, IA 52307-0148
PO BOX 149, MIDDLE AMANA, IA 52307-0149
PO BOX 150, MIDDLE AMANA, IA 52307-0150
PO BOX 151, MIDDLE AMANA, IA 52307-0151
PO BOX 152, MIDDLE AMANA, IA 52307-0152
PO BOX 153, MIDDLE AMANA, IA 52307-0153
PO BOX 154, MIDDLE AMANA, IA 52307-0154
PO BOX 155, MIDDLE AMANA, IA 52307-0155
PO BOX 156, MIDDLE AMANA, IA 52307-0156
PO BOX 157, MIDDLE AMANA, IA 52307-0157
PO BOX 158, MIDDLE AMANA, IA 52307-0158
PO BOX 159, MIDDLE AMANA, IA 52307-0159
PO BOX 160, MIDDLE AMANA, IA 52307-0160
PO BOX 161, MIDDLE AMANA, IA 52307-0161
PO BOX 162, MIDDLE AMANA, IA 52307-0162
PO BOX 163, MIDDLE AMANA, IA 52307-0163
PO BOX 164, MIDDLE AMANA, IA 52307-0164
PO BOX 165, MIDDLE AMANA, IA 52307-0165
PO BOX 166, MIDDLE AMANA, IA 52307-0166
PO BOX 167, MIDDLE AMANA, IA 52307-0167
PO BOX 168, MIDDLE AMANA, IA 52307-0168
PO BOX 169, MIDDLE AMANA, IA 52307-0169
PO BOX 170, MIDDLE AMANA, IA 52307-0170
PO BOX 171, MIDDLE AMANA, IA 52307-0171
PO BOX 172, MIDDLE AMANA, IA 52307-0172
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