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, ANTHON, IA 51004-0001
PO BOX 2, ANTHON, IA 51004-0002
PO BOX 3, ANTHON, IA 51004-0003
PO BOX 4, ANTHON, IA 51004-0004
PO BOX 5, ANTHON, IA 51004-0005
PO BOX 6, ANTHON, IA 51004-0006
PO BOX 7, ANTHON, IA 51004-0007
PO BOX 8, ANTHON, IA 51004-0008
PO BOX 9, ANTHON, IA 51004-0009
PO BOX 10, ANTHON, IA 51004-0010
PO BOX 11, ANTHON, IA 51004-0011
PO BOX 12, ANTHON, IA 51004-0012
PO BOX 13, ANTHON, IA 51004-0013
PO BOX 14, ANTHON, IA 51004-0014
PO BOX 15, ANTHON, IA 51004-0015
PO BOX 16, ANTHON, IA 51004-0016
PO BOX 17, ANTHON, IA 51004-0017
PO BOX 18, ANTHON, IA 51004-0018
PO BOX 19, ANTHON, IA 51004-0019
PO BOX 20, ANTHON, IA 51004-0020
PO BOX 21, ANTHON, IA 51004-0021
PO BOX 22, ANTHON, IA 51004-0022
PO BOX 23, ANTHON, IA 51004-0023
PO BOX 24, ANTHON, IA 51004-0024
PO BOX 25, ANTHON, IA 51004-0025
PO BOX 26, ANTHON, IA 51004-0026
PO BOX 27, ANTHON, IA 51004-0027
PO BOX 28, ANTHON, IA 51004-0028
PO BOX 29, ANTHON, IA 51004-0029
PO BOX 30, ANTHON, IA 51004-0030
PO BOX 31, ANTHON, IA 51004-0031
PO BOX 32, ANTHON, IA 51004-0032
PO BOX 33, ANTHON, IA 51004-0033
PO BOX 34, ANTHON, IA 51004-0034
PO BOX 35, ANTHON, IA 51004-0035
PO BOX 36, ANTHON, IA 51004-0036
PO BOX 37, ANTHON, IA 51004-0037
PO BOX 38, ANTHON, IA 51004-0038
PO BOX 39, ANTHON, IA 51004-0039
PO BOX 40, ANTHON, IA 51004-0040
PO BOX 41, ANTHON, IA 51004-0041
PO BOX 42, ANTHON, IA 51004-0042
PO BOX 43, ANTHON, IA 51004-0043
PO BOX 44, ANTHON, IA 51004-0044
PO BOX 45, ANTHON, IA 51004-0045
PO BOX 46, ANTHON, IA 51004-0046
PO BOX 47, ANTHON, IA 51004-0047
PO BOX 48, ANTHON, IA 51004-0048
PO BOX 49, ANTHON, IA 51004-0049
PO BOX 50, ANTHON, IA 51004-0050
PO BOX 51, ANTHON, IA 51004-0051
PO BOX 52, ANTHON, IA 51004-0052
PO BOX 53, ANTHON, IA 51004-0053
PO BOX 54, ANTHON, IA 51004-0054
PO BOX 55, ANTHON, IA 51004-0055
PO BOX 56, ANTHON, IA 51004-0056
PO BOX 57, ANTHON, IA 51004-0057
PO BOX 58, ANTHON, IA 51004-0058
PO BOX 59, ANTHON, IA 51004-0059
PO BOX 60, ANTHON, IA 51004-0060
PO BOX 61, ANTHON, IA 51004-0061
PO BOX 62, ANTHON, IA 51004-0062
PO BOX 63, ANTHON, IA 51004-0063
PO BOX 64, ANTHON, IA 51004-0064
PO BOX 65, ANTHON, IA 51004-0065
PO BOX 66, ANTHON, IA 51004-0066
PO BOX 67, ANTHON, IA 51004-0067
PO BOX 68, ANTHON, IA 51004-0068
PO BOX 69, ANTHON, IA 51004-0069
PO BOX 70, ANTHON, IA 51004-0070
PO BOX 71, ANTHON, IA 51004-0071
PO BOX 72, ANTHON, IA 51004-0072
PO BOX 73, ANTHON, IA 51004-0073
PO BOX 74, ANTHON, IA 51004-0074
PO BOX 75, ANTHON, IA 51004-0075
PO BOX 76, ANTHON, IA 51004-0076
PO BOX 77, ANTHON, IA 51004-0077
PO BOX 78, ANTHON, IA 51004-0078
PO BOX 79, ANTHON, IA 51004-0079
PO BOX 80, ANTHON, IA 51004-0080
PO BOX 81, ANTHON, IA 51004-0081
PO BOX 82, ANTHON, IA 51004-0082
PO BOX 83, ANTHON, IA 51004-0083
PO BOX 84, ANTHON, IA 51004-0084
PO BOX 85, ANTHON, IA 51004-0085
PO BOX 86, ANTHON, IA 51004-0086
PO BOX 87, ANTHON, IA 51004-0087
PO BOX 88, ANTHON, IA 51004-0088
PO BOX 89, ANTHON, IA 51004-0089
PO BOX 90, ANTHON, IA 51004-0090
PO BOX 91, ANTHON, IA 51004-0091
PO BOX 92, ANTHON, IA 51004-0092
PO BOX 93, ANTHON, IA 51004-0093
PO BOX 94, ANTHON, IA 51004-0094
PO BOX 95, ANTHON, IA 51004-0095
PO BOX 96, ANTHON, IA 51004-0096
PO BOX 97, ANTHON, IA 51004-0097
PO BOX 98, ANTHON, IA 51004-0098
PO BOX 99, ANTHON, IA 51004-0099
PO BOX 100, ANTHON, IA 51004-0100
PO BOX 101, ANTHON, IA 51004-0101
PO BOX 102, ANTHON, IA 51004-0102
PO BOX 103, ANTHON, IA 51004-0103
PO BOX 104, ANTHON, IA 51004-0104
PO BOX 105, ANTHON, IA 51004-0105
PO BOX 106, ANTHON, IA 51004-0106
PO BOX 107, ANTHON, IA 51004-0107
PO BOX 108, ANTHON, IA 51004-0108
PO BOX 109, ANTHON, IA 51004-0109
PO BOX 110, ANTHON, IA 51004-0110
PO BOX 111, ANTHON, IA 51004-0111
PO BOX 112, ANTHON, IA 51004-0112
PO BOX 113, ANTHON, IA 51004-0113
PO BOX 114, ANTHON, IA 51004-0114
PO BOX 115, ANTHON, IA 51004-0115
PO BOX 116, ANTHON, IA 51004-0116
PO BOX 117, ANTHON, IA 51004-0117
PO BOX 118, ANTHON, IA 51004-0118
PO BOX 119, ANTHON, IA 51004-0119
PO BOX 120, ANTHON, IA 51004-0120
PO BOX 121, ANTHON, IA 51004-0121
PO BOX 122, ANTHON, IA 51004-0122
PO BOX 123, ANTHON, IA 51004-0123
PO BOX 124, ANTHON, IA 51004-0124
PO BOX 125, ANTHON, IA 51004-0125
PO BOX 126, ANTHON, IA 51004-0126
PO BOX 127, ANTHON, IA 51004-0127
PO BOX 128, ANTHON, IA 51004-0128
PO BOX 129, ANTHON, IA 51004-0129
PO BOX 130, ANTHON, IA 51004-0130
PO BOX 131, ANTHON, IA 51004-0131
PO BOX 132, ANTHON, IA 51004-0132
PO BOX 133, ANTHON, IA 51004-0133
PO BOX 134, ANTHON, IA 51004-0134
PO BOX 135, ANTHON, IA 51004-0135
PO BOX 136, ANTHON, IA 51004-0136
PO BOX 137, ANTHON, IA 51004-0137
PO BOX 138, ANTHON, IA 51004-0138
PO BOX 139, ANTHON, IA 51004-0139
PO BOX 140, ANTHON, IA 51004-0140
PO BOX 141, ANTHON, IA 51004-0141
PO BOX 142, ANTHON, IA 51004-0142
PO BOX 143, ANTHON, IA 51004-0143
PO BOX 144, ANTHON, IA 51004-0144
PO BOX 145, ANTHON, IA 51004-0145
PO BOX 146, ANTHON, IA 51004-0146
PO BOX 147, ANTHON, IA 51004-0147
PO BOX 148, ANTHON, IA 51004-0148
PO BOX 149, ANTHON, IA 51004-0149
PO BOX 150, ANTHON, IA 51004-0150
PO BOX 151, ANTHON, IA 51004-0151
PO BOX 152, ANTHON, IA 51004-0152
PO BOX 153, ANTHON, IA 51004-0153
PO BOX 154, ANTHON, IA 51004-0154
PO BOX 155, ANTHON, IA 51004-0155
PO BOX 156, ANTHON, IA 51004-0156
PO BOX 157, ANTHON, IA 51004-0157
PO BOX 158, ANTHON, IA 51004-0158
PO BOX 159, ANTHON, IA 51004-0159
PO BOX 160, ANTHON, IA 51004-0160
PO BOX 161, ANTHON, IA 51004-0161
PO BOX 162, ANTHON, IA 51004-0162
PO BOX 163, ANTHON, IA 51004-0163
PO BOX 164, ANTHON, IA 51004-0164
PO BOX 165, ANTHON, IA 51004-0165
PO BOX 166, ANTHON, IA 51004-0166
PO BOX 167, ANTHON, IA 51004-0167
PO BOX 168, ANTHON, IA 51004-0168
PO BOX 169, ANTHON, IA 51004-0169
PO BOX 170, ANTHON, IA 51004-0170
PO BOX 171, ANTHON, IA 51004-0171
PO BOX 172, ANTHON, IA 51004-0172
PO BOX 173, ANTHON, IA 51004-0173
PO BOX 174, ANTHON, IA 51004-0174
PO BOX 175, ANTHON, IA 51004-0175
PO BOX 176, ANTHON, IA 51004-0176
PO BOX 177, ANTHON, IA 51004-0177
PO BOX 178, ANTHON, IA 51004-0178
PO BOX 179, ANTHON, IA 51004-0179
PO BOX 180, ANTHON, IA 51004-0180
PO BOX 181, ANTHON, IA 51004-0181
PO BOX 182, ANTHON, IA 51004-0182
PO BOX 183, ANTHON, IA 51004-0183
PO BOX 184, ANTHON, IA 51004-0184
PO BOX 185, ANTHON, IA 51004-0185
PO BOX 186, ANTHON, IA 51004-0186
PO BOX 187, ANTHON, IA 51004-0187
PO BOX 188, ANTHON, IA 51004-0188
PO BOX 189, ANTHON, IA 51004-0189
PO BOX 190, ANTHON, IA 51004-0190
PO BOX 191, ANTHON, IA 51004-0191
PO BOX 192, ANTHON, IA 51004-0192
PO BOX 193, ANTHON, IA 51004-0193
PO BOX 194, ANTHON, IA 51004-0194
PO BOX 195, ANTHON, IA 51004-0195
PO BOX 196, ANTHON, IA 51004-0196
PO BOX 197, ANTHON, IA 51004-0197
PO BOX 198, ANTHON, IA 51004-0198
PO BOX 199, ANTHON, IA 51004-0199
PO BOX 200, ANTHON, IA 51004-0200
PO BOX 201, ANTHON, IA 51004-0201
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