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, AMANA, IA 52203-0001
PO BOX 2, AMANA, IA 52203-0002
PO BOX 3, AMANA, IA 52203-0003
PO BOX 4, AMANA, IA 52203-0004
PO BOX 5, AMANA, IA 52203-0005
PO BOX 6, AMANA, IA 52203-0006
PO BOX 7, AMANA, IA 52203-0007
PO BOX 8, AMANA, IA 52203-0008
PO BOX 9, AMANA, IA 52203-0009
PO BOX 10, AMANA, IA 52203-0010
PO BOX 11, AMANA, IA 52203-0011
PO BOX 12, AMANA, IA 52203-0012
PO BOX 13, AMANA, IA 52203-0013
PO BOX 14, AMANA, IA 52203-0014
PO BOX 15, AMANA, IA 52203-0015
PO BOX 16, AMANA, IA 52203-0016
PO BOX 17, AMANA, IA 52203-0017
PO BOX 18, AMANA, IA 52203-0018
PO BOX 19, AMANA, IA 52203-0019
PO BOX 20, AMANA, IA 52203-0020
PO BOX 21, AMANA, IA 52203-0021
PO BOX 22, AMANA, IA 52203-0022
PO BOX 23, AMANA, IA 52203-0023
PO BOX 24, AMANA, IA 52203-0024
PO BOX 25, AMANA, IA 52203-0025
PO BOX 26, AMANA, IA 52203-0026
PO BOX 27, AMANA, IA 52203-0027
PO BOX 28, AMANA, IA 52203-0028
PO BOX 29, AMANA, IA 52203-0029
PO BOX 30, AMANA, IA 52203-0030
PO BOX 31, AMANA, IA 52203-0031
PO BOX 32, AMANA, IA 52203-0032
PO BOX 33, AMANA, IA 52203-0033
PO BOX 34, AMANA, IA 52203-0034
PO BOX 35, AMANA, IA 52203-0035
PO BOX 36, AMANA, IA 52203-0036
PO BOX 37, AMANA, IA 52203-0037
PO BOX 38, AMANA, IA 52203-0038
PO BOX 39, AMANA, IA 52203-0039
PO BOX 40, AMANA, IA 52203-0040
PO BOX 41, AMANA, IA 52203-0041
PO BOX 42, AMANA, IA 52203-0042
PO BOX 43, AMANA, IA 52203-0043
PO BOX 44, AMANA, IA 52203-0044
PO BOX 45, AMANA, IA 52203-0045
PO BOX 46, AMANA, IA 52203-0046
PO BOX 47, AMANA, IA 52203-0047
PO BOX 48, AMANA, IA 52203-0048
PO BOX 49, AMANA, IA 52203-0049
PO BOX 50, AMANA, IA 52203-0050
PO BOX 51, AMANA, IA 52203-0051
PO BOX 52, AMANA, IA 52203-0052
PO BOX 53, AMANA, IA 52203-0053
PO BOX 54, AMANA, IA 52203-0054
PO BOX 55, AMANA, IA 52203-0055
PO BOX 56, AMANA, IA 52203-0056
PO BOX 57, AMANA, IA 52203-0057
PO BOX 58, AMANA, IA 52203-0058
PO BOX 59, AMANA, IA 52203-0059
PO BOX 60, AMANA, IA 52203-0060
PO BOX 61, AMANA, IA 52203-0061
PO BOX 62, AMANA, IA 52203-0062
PO BOX 63, AMANA, IA 52203-0063
PO BOX 64, AMANA, IA 52203-0064
PO BOX 65, AMANA, IA 52203-0065
PO BOX 66, AMANA, IA 52203-0066
PO BOX 67, AMANA, IA 52203-0067
PO BOX 68, AMANA, IA 52203-0068
PO BOX 69, AMANA, IA 52203-0069
PO BOX 70, AMANA, IA 52203-0070
PO BOX 71, AMANA, IA 52203-0071
PO BOX 72, AMANA, IA 52203-0072
PO BOX 73, AMANA, IA 52203-0073
PO BOX 74, AMANA, IA 52203-0074
PO BOX 75, AMANA, IA 52203-0075
PO BOX 76, AMANA, IA 52203-0076
PO BOX 77, AMANA, IA 52203-0077
PO BOX 78, AMANA, IA 52203-0078
PO BOX 79, AMANA, IA 52203-0079
PO BOX 80, AMANA, IA 52203-0080
PO BOX 81, AMANA, IA 52203-0081
PO BOX 82, AMANA, IA 52203-0082
PO BOX 83, AMANA, IA 52203-0083
PO BOX 84, AMANA, IA 52203-0084
PO BOX 85, AMANA, IA 52203-0085
PO BOX 86, AMANA, IA 52203-0086
PO BOX 87, AMANA, IA 52203-0087
PO BOX 88, AMANA, IA 52203-0088
PO BOX 89, AMANA, IA 52203-0089
PO BOX 90, AMANA, IA 52203-0090
PO BOX 91, AMANA, IA 52203-0091
PO BOX 92, AMANA, IA 52203-0092
PO BOX 93, AMANA, IA 52203-0093
PO BOX 94, AMANA, IA 52203-0094
PO BOX 95, AMANA, IA 52203-0095
PO BOX 96, AMANA, IA 52203-0096
PO BOX 97, AMANA, IA 52203-0097
PO BOX 98, AMANA, IA 52203-0098
PO BOX 99, AMANA, IA 52203-0099
PO BOX 100, AMANA, IA 52203-0100
PO BOX 101, AMANA, IA 52203-0101
PO BOX 102, AMANA, IA 52203-0102
PO BOX 103, AMANA, IA 52203-0103
PO BOX 104, AMANA, IA 52203-0104
PO BOX 105, AMANA, IA 52203-0105
PO BOX 106, AMANA, IA 52203-0106
PO BOX 107, AMANA, IA 52203-0107
PO BOX 108, AMANA, IA 52203-0108
PO BOX 109, AMANA, IA 52203-0109
PO BOX 110, AMANA, IA 52203-0110
PO BOX 111, AMANA, IA 52203-0111
PO BOX 112, AMANA, IA 52203-0112
PO BOX 113, AMANA, IA 52203-0113
PO BOX 114, AMANA, IA 52203-0114
PO BOX 115, AMANA, IA 52203-0115
PO BOX 116, AMANA, IA 52203-0116
PO BOX 117, AMANA, IA 52203-0117
PO BOX 118, AMANA, IA 52203-0118
PO BOX 119, AMANA, IA 52203-0119
PO BOX 120, AMANA, IA 52203-0120
PO BOX 121, AMANA, IA 52203-0121
PO BOX 122, AMANA, IA 52203-0122
PO BOX 123, AMANA, IA 52203-0123
PO BOX 124, AMANA, IA 52203-0124
PO BOX 125, AMANA, IA 52203-0125
PO BOX 126, AMANA, IA 52203-0126
PO BOX 127, AMANA, IA 52203-0127
PO BOX 128, AMANA, IA 52203-0128
PO BOX 129, AMANA, IA 52203-0129
PO BOX 130, AMANA, IA 52203-0130
PO BOX 131, AMANA, IA 52203-0131
PO BOX 132, AMANA, IA 52203-0132
PO BOX 133, AMANA, IA 52203-0133
PO BOX 134, AMANA, IA 52203-0134
PO BOX 135, AMANA, IA 52203-0135
PO BOX 136, AMANA, IA 52203-0136
PO BOX 137, AMANA, IA 52203-0137
PO BOX 138, AMANA, IA 52203-0138
PO BOX 139, AMANA, IA 52203-0139
PO BOX 140, AMANA, IA 52203-0140
PO BOX 141, AMANA, IA 52203-0141
PO BOX 142, AMANA, IA 52203-0142
PO BOX 143, AMANA, IA 52203-0143
PO BOX 144, AMANA, IA 52203-0144
PO BOX 145, AMANA, IA 52203-0145
PO BOX 146, AMANA, IA 52203-0146
PO BOX 147, AMANA, IA 52203-0147
PO BOX 148, AMANA, IA 52203-0148
PO BOX 149, AMANA, IA 52203-0149
PO BOX 150, AMANA, IA 52203-0150
PO BOX 151, AMANA, IA 52203-0151
PO BOX 152, AMANA, IA 52203-0152
PO BOX 153, AMANA, IA 52203-0153
PO BOX 154, AMANA, IA 52203-0154
PO BOX 155, AMANA, IA 52203-0155
PO BOX 156, AMANA, IA 52203-0156
PO BOX 157, AMANA, IA 52203-0157
PO BOX 158, AMANA, IA 52203-0158
PO BOX 159, AMANA, IA 52203-0159
PO BOX 160, AMANA, IA 52203-0160
PO BOX 161, AMANA, IA 52203-0161
PO BOX 162, AMANA, IA 52203-0162
PO BOX 163, AMANA, IA 52203-0163
PO BOX 164, AMANA, IA 52203-0164
PO BOX 165, AMANA, IA 52203-0165
PO BOX 166, AMANA, IA 52203-0166
PO BOX 167, AMANA, IA 52203-0167
PO BOX 168, AMANA, IA 52203-0168
PO BOX 169, AMANA, IA 52203-0169
PO BOX 170, AMANA, IA 52203-0170
PO BOX 171, AMANA, IA 52203-0171
PO BOX 172, AMANA, IA 52203-0172
PO BOX 173, AMANA, IA 52203-0173
PO BOX 174, AMANA, IA 52203-0174
PO BOX 175, AMANA, IA 52203-0175
PO BOX 176, AMANA, IA 52203-0176
PO BOX 177, AMANA, IA 52203-0177
PO BOX 178, AMANA, IA 52203-0178
PO BOX 179, AMANA, IA 52203-0179
PO BOX 180, AMANA, IA 52203-0180
PO BOX 181, AMANA, IA 52203-0181
PO BOX 182, AMANA, IA 52203-0182
PO BOX 183, AMANA, IA 52203-0183
PO BOX 184, AMANA, IA 52203-0184
PO BOX 185, AMANA, IA 52203-0185
PO BOX 186, AMANA, IA 52203-0186
PO BOX 187, AMANA, IA 52203-0187
PO BOX 188, AMANA, IA 52203-0188
PO BOX 189, AMANA, IA 52203-0189
PO BOX 190, AMANA, IA 52203-0190
PO BOX 191, AMANA, IA 52203-0191
PO BOX 192, AMANA, IA 52203-0192
PO BOX 193, AMANA, IA 52203-0193
PO BOX 194, AMANA, IA 52203-0194
PO BOX 195, AMANA, IA 52203-0195
PO BOX 196, AMANA, IA 52203-0196
PO BOX 197, AMANA, IA 52203-0197
PO BOX 198, AMANA, IA 52203-0198
PO BOX 199, AMANA, IA 52203-0199
PO BOX 200, AMANA, IA 52203-0200
PO BOX 201, AMANA, IA 52203-0201
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