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, CLARION, IA 50525-0001
PO BOX 2, CLARION, IA 50525-0002
PO BOX 3, CLARION, IA 50525-0003
PO BOX 4, CLARION, IA 50525-0004
PO BOX 5, CLARION, IA 50525-0005
PO BOX 6, CLARION, IA 50525-0006
PO BOX 7, CLARION, IA 50525-0007
PO BOX 8, CLARION, IA 50525-0008
PO BOX 9, CLARION, IA 50525-0009
PO BOX 10, CLARION, IA 50525-0010
PO BOX 11, CLARION, IA 50525-0011
PO BOX 12, CLARION, IA 50525-0012
PO BOX 13, CLARION, IA 50525-0013
PO BOX 14, CLARION, IA 50525-0014
PO BOX 15, CLARION, IA 50525-0015
PO BOX 16, CLARION, IA 50525-0016
PO BOX 17, CLARION, IA 50525-0017
PO BOX 18, CLARION, IA 50525-0018
PO BOX 19, CLARION, IA 50525-0019
PO BOX 20, CLARION, IA 50525-0020
PO BOX 21, CLARION, IA 50525-0021
PO BOX 22, CLARION, IA 50525-0022
PO BOX 23, CLARION, IA 50525-0023
PO BOX 24, CLARION, IA 50525-0024
PO BOX 25, CLARION, IA 50525-0025
PO BOX 26, CLARION, IA 50525-0026
PO BOX 27, CLARION, IA 50525-0027
PO BOX 28, CLARION, IA 50525-0028
PO BOX 29, CLARION, IA 50525-0029
PO BOX 30, CLARION, IA 50525-0030
PO BOX 31, CLARION, IA 50525-0031
PO BOX 32, CLARION, IA 50525-0032
PO BOX 33, CLARION, IA 50525-0033
PO BOX 34, CLARION, IA 50525-0034
PO BOX 35, CLARION, IA 50525-0035
PO BOX 36, CLARION, IA 50525-0036
PO BOX 37, CLARION, IA 50525-0037
PO BOX 38, CLARION, IA 50525-0038
PO BOX 39, CLARION, IA 50525-0039
PO BOX 40, CLARION, IA 50525-0040
PO BOX 41, CLARION, IA 50525-0041
PO BOX 42, CLARION, IA 50525-0042
PO BOX 43, CLARION, IA 50525-0043
PO BOX 44, CLARION, IA 50525-0044
PO BOX 45, CLARION, IA 50525-0045
PO BOX 46, CLARION, IA 50525-0046
PO BOX 47, CLARION, IA 50525-0047
PO BOX 48, CLARION, IA 50525-0048
PO BOX 49, CLARION, IA 50525-0049
PO BOX 50, CLARION, IA 50525-0050
PO BOX 51, CLARION, IA 50525-0051
PO BOX 52, CLARION, IA 50525-0052
PO BOX 53, CLARION, IA 50525-0053
PO BOX 54, CLARION, IA 50525-0054
PO BOX 55, CLARION, IA 50525-0055
PO BOX 56, CLARION, IA 50525-0056
PO BOX 57, CLARION, IA 50525-0057
PO BOX 58, CLARION, IA 50525-0058
PO BOX 59, CLARION, IA 50525-0059
PO BOX 60, CLARION, IA 50525-0060
PO BOX 61, CLARION, IA 50525-0061
PO BOX 62, CLARION, IA 50525-0062
PO BOX 63, CLARION, IA 50525-0063
PO BOX 64, CLARION, IA 50525-0064
PO BOX 65, CLARION, IA 50525-0065
PO BOX 66, CLARION, IA 50525-0066
PO BOX 67, CLARION, IA 50525-0067
PO BOX 68, CLARION, IA 50525-0068
PO BOX 69, CLARION, IA 50525-0069
PO BOX 70, CLARION, IA 50525-0070
PO BOX 71, CLARION, IA 50525-0071
PO BOX 72, CLARION, IA 50525-0072
PO BOX 73, CLARION, IA 50525-0073
PO BOX 74, CLARION, IA 50525-0074
PO BOX 75, CLARION, IA 50525-0075
PO BOX 76, CLARION, IA 50525-0076
PO BOX 77, CLARION, IA 50525-0077
PO BOX 78, CLARION, IA 50525-0078
PO BOX 79, CLARION, IA 50525-0079
PO BOX 80, CLARION, IA 50525-0080
PO BOX 81, CLARION, IA 50525-0081
PO BOX 82, CLARION, IA 50525-0082
PO BOX 83, CLARION, IA 50525-0083
PO BOX 84, CLARION, IA 50525-0084
PO BOX 85, CLARION, IA 50525-0085
PO BOX 86, CLARION, IA 50525-0086
PO BOX 87, CLARION, IA 50525-0087
PO BOX 88, CLARION, IA 50525-0088
PO BOX 89, CLARION, IA 50525-0089
PO BOX 90, CLARION, IA 50525-0090
PO BOX 91, CLARION, IA 50525-0091
PO BOX 92, CLARION, IA 50525-0092
PO BOX 93, CLARION, IA 50525-0093
PO BOX 94, CLARION, IA 50525-0094
PO BOX 95, CLARION, IA 50525-0095
PO BOX 96, CLARION, IA 50525-0096
PO BOX 97, CLARION, IA 50525-0097
PO BOX 98, CLARION, IA 50525-0098
PO BOX 99, CLARION, IA 50525-0099
PO BOX 100, CLARION, IA 50525-0100
PO BOX 101, CLARION, IA 50525-0101
PO BOX 102, CLARION, IA 50525-0102
PO BOX 103, CLARION, IA 50525-0103
PO BOX 104, CLARION, IA 50525-0104
PO BOX 105, CLARION, IA 50525-0105
PO BOX 106, CLARION, IA 50525-0106
PO BOX 107, CLARION, IA 50525-0107
PO BOX 108, CLARION, IA 50525-0108
PO BOX 109, CLARION, IA 50525-0109
PO BOX 110, CLARION, IA 50525-0110
PO BOX 111, CLARION, IA 50525-0111
PO BOX 112, CLARION, IA 50525-0112
PO BOX 113, CLARION, IA 50525-0113
PO BOX 114, CLARION, IA 50525-0114
PO BOX 115, CLARION, IA 50525-0115
PO BOX 116, CLARION, IA 50525-0116
PO BOX 117, CLARION, IA 50525-0117
PO BOX 118, CLARION, IA 50525-0118
PO BOX 119, CLARION, IA 50525-0119
PO BOX 120, CLARION, IA 50525-0120
PO BOX 121, CLARION, IA 50525-0121
PO BOX 122, CLARION, IA 50525-0122
PO BOX 123, CLARION, IA 50525-0123
PO BOX 124, CLARION, IA 50525-0124
PO BOX 125, CLARION, IA 50525-0125
PO BOX 126, CLARION, IA 50525-0126
PO BOX 127, CLARION, IA 50525-0127
PO BOX 128, CLARION, IA 50525-0128
PO BOX 129, CLARION, IA 50525-0129
PO BOX 130, CLARION, IA 50525-0130
PO BOX 131, CLARION, IA 50525-0131
PO BOX 132, CLARION, IA 50525-0132
PO BOX 133, CLARION, IA 50525-0133
PO BOX 134, CLARION, IA 50525-0134
PO BOX 135, CLARION, IA 50525-0135
PO BOX 136, CLARION, IA 50525-0136
PO BOX 137, CLARION, IA 50525-0137
PO BOX 138, CLARION, IA 50525-0138
PO BOX 139, CLARION, IA 50525-0139
PO BOX 140, CLARION, IA 50525-0140
PO BOX 141, CLARION, IA 50525-0141
PO BOX 142, CLARION, IA 50525-0142
PO BOX 143, CLARION, IA 50525-0143
PO BOX 144, CLARION, IA 50525-0144
PO BOX 145, CLARION, IA 50525-0145
PO BOX 146, CLARION, IA 50525-0146
PO BOX 147, CLARION, IA 50525-0147
PO BOX 148, CLARION, IA 50525-0148
PO BOX 149, CLARION, IA 50525-0149
PO BOX 150, CLARION, IA 50525-0150
PO BOX 151, CLARION, IA 50525-0151
PO BOX 152, CLARION, IA 50525-0152
PO BOX 153, CLARION, IA 50525-0153
PO BOX 154, CLARION, IA 50525-0154
PO BOX 155, CLARION, IA 50525-0155
PO BOX 156, CLARION, IA 50525-0156
PO BOX 157, CLARION, IA 50525-0157
PO BOX 158, CLARION, IA 50525-0158
PO BOX 159, CLARION, IA 50525-0159
PO BOX 160, CLARION, IA 50525-0160
PO BOX 161, CLARION, IA 50525-0161
PO BOX 162, CLARION, IA 50525-0162
PO BOX 163, CLARION, IA 50525-0163
PO BOX 164, CLARION, IA 50525-0164
PO BOX 165, CLARION, IA 50525-0165
PO BOX 166, CLARION, IA 50525-0166
PO BOX 167, CLARION, IA 50525-0167
PO BOX 168, CLARION, IA 50525-0168
PO BOX 169, CLARION, IA 50525-0169
PO BOX 170, CLARION, IA 50525-0170
PO BOX 171, CLARION, IA 50525-0171
PO BOX 172, CLARION, IA 50525-0172
PO BOX 173, CLARION, IA 50525-0173
PO BOX 174, CLARION, IA 50525-0174
PO BOX 175, CLARION, IA 50525-0175
PO BOX 176, CLARION, IA 50525-0176
PO BOX 177, CLARION, IA 50525-0177
PO BOX 178, CLARION, IA 50525-0178
PO BOX 179, CLARION, IA 50525-0179
PO BOX 180, CLARION, IA 50525-0180
PO BOX 181, CLARION, IA 50525-0181
PO BOX 182, CLARION, IA 50525-0182
PO BOX 183, CLARION, IA 50525-0183
PO BOX 184, CLARION, IA 50525-0184
PO BOX 185, CLARION, IA 50525-0185
PO BOX 186, CLARION, IA 50525-0186
PO BOX 187, CLARION, IA 50525-0187
PO BOX 188, CLARION, IA 50525-0188
PO BOX 189, CLARION, IA 50525-0189
PO BOX 190, CLARION, IA 50525-0190
PO BOX 191, CLARION, IA 50525-0191
PO BOX 192, CLARION, IA 50525-0192
PO BOX 193, CLARION, IA 50525-0193
PO BOX 194, CLARION, IA 50525-0194
PO BOX 195, CLARION, IA 50525-0195
PO BOX 196, CLARION, IA 50525-0196
PO BOX 197, CLARION, IA 50525-0197
PO BOX 198, CLARION, IA 50525-0198
PO BOX 199, CLARION, IA 50525-0199
PO BOX 200, CLARION, IA 50525-0200
PO BOX 201, CLARION, IA 50525-0201
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