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 20, CLARENCE, IA 52216-0020
PO BOX 21, CLARENCE, IA 52216-0021
PO BOX 22, CLARENCE, IA 52216-0022
PO BOX 23, CLARENCE, IA 52216-0023
PO BOX 24, CLARENCE, IA 52216-0024
PO BOX 25, CLARENCE, IA 52216-0025
PO BOX 26, CLARENCE, IA 52216-0026
PO BOX 27, CLARENCE, IA 52216-0027
PO BOX 28, CLARENCE, IA 52216-0028
PO BOX 29, CLARENCE, IA 52216-0029
PO BOX 30, CLARENCE, IA 52216-0030
PO BOX 31, CLARENCE, IA 52216-0031
PO BOX 32, CLARENCE, IA 52216-0032
PO BOX 33, CLARENCE, IA 52216-0033
PO BOX 34, CLARENCE, IA 52216-0034
PO BOX 35, CLARENCE, IA 52216-0035
PO BOX 36, CLARENCE, IA 52216-0036
PO BOX 37, CLARENCE, IA 52216-0037
PO BOX 38, CLARENCE, IA 52216-0038
PO BOX 39, CLARENCE, IA 52216-0039
PO BOX 40, CLARENCE, IA 52216-0040
PO BOX 41, CLARENCE, IA 52216-0041
PO BOX 42, CLARENCE, IA 52216-0042
PO BOX 43, CLARENCE, IA 52216-0043
PO BOX 44, CLARENCE, IA 52216-0044
PO BOX 45, CLARENCE, IA 52216-0045
PO BOX 46, CLARENCE, IA 52216-0046
PO BOX 47, CLARENCE, IA 52216-0047
PO BOX 48, CLARENCE, IA 52216-0048
PO BOX 49, CLARENCE, IA 52216-0049
PO BOX 50, CLARENCE, IA 52216-0050
PO BOX 51, CLARENCE, IA 52216-0051
PO BOX 52, CLARENCE, IA 52216-0052
PO BOX 53, CLARENCE, IA 52216-0053
PO BOX 54, CLARENCE, IA 52216-0054
PO BOX 55, CLARENCE, IA 52216-0055
PO BOX 56, CLARENCE, IA 52216-0056
PO BOX 57, CLARENCE, IA 52216-0057
PO BOX 58, CLARENCE, IA 52216-0058
PO BOX 59, CLARENCE, IA 52216-0059
PO BOX 60, CLARENCE, IA 52216-0060
PO BOX 61, CLARENCE, IA 52216-0061
PO BOX 62, CLARENCE, IA 52216-0062
PO BOX 63, CLARENCE, IA 52216-0063
PO BOX 64, CLARENCE, IA 52216-0064
PO BOX 65, CLARENCE, IA 52216-0065
PO BOX 66, CLARENCE, IA 52216-0066
PO BOX 67, CLARENCE, IA 52216-0067
PO BOX 68, CLARENCE, IA 52216-0068
PO BOX 69, CLARENCE, IA 52216-0069
PO BOX 70, CLARENCE, IA 52216-0070
PO BOX 71, CLARENCE, IA 52216-0071
PO BOX 72, CLARENCE, IA 52216-0072
PO BOX 73, CLARENCE, IA 52216-0073
PO BOX 74, CLARENCE, IA 52216-0074
PO BOX 75, CLARENCE, IA 52216-0075
PO BOX 76, CLARENCE, IA 52216-0076
PO BOX 77, CLARENCE, IA 52216-0077
PO BOX 78, CLARENCE, IA 52216-0078
PO BOX 79, CLARENCE, IA 52216-0079
PO BOX 80, CLARENCE, IA 52216-0080
PO BOX 81, CLARENCE, IA 52216-0081
PO BOX 82, CLARENCE, IA 52216-0082
PO BOX 83, CLARENCE, IA 52216-0083
PO BOX 84, CLARENCE, IA 52216-0084
PO BOX 85, CLARENCE, IA 52216-0085
PO BOX 86, CLARENCE, IA 52216-0086
PO BOX 87, CLARENCE, IA 52216-0087
PO BOX 88, CLARENCE, IA 52216-0088
PO BOX 89, CLARENCE, IA 52216-0089
PO BOX 90, CLARENCE, IA 52216-0090
PO BOX 91, CLARENCE, IA 52216-0091
PO BOX 92, CLARENCE, IA 52216-0092
PO BOX 93, CLARENCE, IA 52216-0093
PO BOX 94, CLARENCE, IA 52216-0094
PO BOX 95, CLARENCE, IA 52216-0095
PO BOX 96, CLARENCE, IA 52216-0096
PO BOX 97, CLARENCE, IA 52216-0097
PO BOX 98, CLARENCE, IA 52216-0098
PO BOX 99, CLARENCE, IA 52216-0099
PO BOX 100, CLARENCE, IA 52216-0100
PO BOX 101, CLARENCE, IA 52216-0101
PO BOX 102, CLARENCE, IA 52216-0102
PO BOX 103, CLARENCE, IA 52216-0103
PO BOX 104, CLARENCE, IA 52216-0104
PO BOX 105, CLARENCE, IA 52216-0105
PO BOX 106, CLARENCE, IA 52216-0106
PO BOX 107, CLARENCE, IA 52216-0107
PO BOX 108, CLARENCE, IA 52216-0108
PO BOX 109, CLARENCE, IA 52216-0109
PO BOX 110, CLARENCE, IA 52216-0110
PO BOX 111, CLARENCE, IA 52216-0111
PO BOX 112, CLARENCE, IA 52216-0112
PO BOX 113, CLARENCE, IA 52216-0113
PO BOX 114, CLARENCE, IA 52216-0114
PO BOX 115, CLARENCE, IA 52216-0115
PO BOX 116, CLARENCE, IA 52216-0116
PO BOX 117, CLARENCE, IA 52216-0117
PO BOX 118, CLARENCE, IA 52216-0118
PO BOX 119, CLARENCE, IA 52216-0119
PO BOX 120, CLARENCE, IA 52216-0120
PO BOX 121, CLARENCE, IA 52216-0121
PO BOX 122, CLARENCE, IA 52216-0122
PO BOX 123, CLARENCE, IA 52216-0123
PO BOX 124, CLARENCE, IA 52216-0124
PO BOX 125, CLARENCE, IA 52216-0125
PO BOX 126, CLARENCE, IA 52216-0126
PO BOX 127, CLARENCE, IA 52216-0127
PO BOX 128, CLARENCE, IA 52216-0128
PO BOX 129, CLARENCE, IA 52216-0129
PO BOX 130, CLARENCE, IA 52216-0130
PO BOX 131, CLARENCE, IA 52216-0131
PO BOX 132, CLARENCE, IA 52216-0132
PO BOX 133, CLARENCE, IA 52216-0133
PO BOX 134, CLARENCE, IA 52216-0134
PO BOX 135, CLARENCE, IA 52216-0135
PO BOX 136, CLARENCE, IA 52216-0136
PO BOX 137, CLARENCE, IA 52216-0137
PO BOX 138, CLARENCE, IA 52216-0138
PO BOX 139, CLARENCE, IA 52216-0139
PO BOX 140, CLARENCE, IA 52216-0140
PO BOX 141, CLARENCE, IA 52216-0141
PO BOX 142, CLARENCE, IA 52216-0142
PO BOX 143, CLARENCE, IA 52216-0143
PO BOX 144, CLARENCE, IA 52216-0144
PO BOX 145, CLARENCE, IA 52216-0145
PO BOX 146, CLARENCE, IA 52216-0146
PO BOX 147, CLARENCE, IA 52216-0147
PO BOX 148, CLARENCE, IA 52216-0148
PO BOX 149, CLARENCE, IA 52216-0149
PO BOX 150, CLARENCE, IA 52216-0150
PO BOX 151, CLARENCE, IA 52216-0151
PO BOX 152, CLARENCE, IA 52216-0152
PO BOX 153, CLARENCE, IA 52216-0153
PO BOX 154, CLARENCE, IA 52216-0154
PO BOX 155, CLARENCE, IA 52216-0155
PO BOX 156, CLARENCE, IA 52216-0156
PO BOX 157, CLARENCE, IA 52216-0157
PO BOX 158, CLARENCE, IA 52216-0158
PO BOX 159, CLARENCE, IA 52216-0159
PO BOX 160, CLARENCE, IA 52216-0160
PO BOX 161, CLARENCE, IA 52216-0161
PO BOX 162, CLARENCE, IA 52216-0162
PO BOX 163, CLARENCE, IA 52216-0163
PO BOX 164, CLARENCE, IA 52216-0164
PO BOX 165, CLARENCE, IA 52216-0165
PO BOX 166, CLARENCE, IA 52216-0166
PO BOX 167, CLARENCE, IA 52216-0167
PO BOX 168, CLARENCE, IA 52216-0168
PO BOX 169, CLARENCE, IA 52216-0169
PO BOX 170, CLARENCE, IA 52216-0170
PO BOX 171, CLARENCE, IA 52216-0171
PO BOX 172, CLARENCE, IA 52216-0172
PO BOX 173, CLARENCE, IA 52216-0173
PO BOX 174, CLARENCE, IA 52216-0174
PO BOX 175, CLARENCE, IA 52216-0175
PO BOX 176, CLARENCE, IA 52216-0176
PO BOX 177, CLARENCE, IA 52216-0177
PO BOX 178, CLARENCE, IA 52216-0178
PO BOX 179, CLARENCE, IA 52216-0179
PO BOX 180, CLARENCE, IA 52216-0180
PO BOX 181, CLARENCE, IA 52216-0181
PO BOX 182, CLARENCE, IA 52216-0182
PO BOX 183, CLARENCE, IA 52216-0183
PO BOX 184, CLARENCE, IA 52216-0184
PO BOX 185, CLARENCE, IA 52216-0185
PO BOX 186, CLARENCE, IA 52216-0186
PO BOX 187, CLARENCE, IA 52216-0187
PO BOX 188, CLARENCE, IA 52216-0188
PO BOX 189, CLARENCE, IA 52216-0189
PO BOX 190, CLARENCE, IA 52216-0190
PO BOX 191, CLARENCE, IA 52216-0191
PO BOX 192, CLARENCE, IA 52216-0192
PO BOX 193, CLARENCE, IA 52216-0193
PO BOX 194, CLARENCE, IA 52216-0194
PO BOX 195, CLARENCE, IA 52216-0195
PO BOX 196, CLARENCE, IA 52216-0196
PO BOX 197, CLARENCE, IA 52216-0197
PO BOX 198, CLARENCE, IA 52216-0198
PO BOX 199, CLARENCE, IA 52216-0199
PO BOX 200, CLARENCE, IA 52216-0200
PO BOX 201, CLARENCE, IA 52216-0201
PO BOX 202, CLARENCE, IA 52216-0202
PO BOX 203, CLARENCE, IA 52216-0203
PO BOX 204, CLARENCE, IA 52216-0204
PO BOX 205, CLARENCE, IA 52216-0205
PO BOX 206, CLARENCE, IA 52216-0206
PO BOX 207, CLARENCE, IA 52216-0207
PO BOX 208, CLARENCE, IA 52216-0208
PO BOX 209, CLARENCE, IA 52216-0209
PO BOX 210, CLARENCE, IA 52216-0210
PO BOX 211, CLARENCE, IA 52216-0211
PO BOX 212, CLARENCE, IA 52216-0212
PO BOX 213, CLARENCE, IA 52216-0213
PO BOX 214, CLARENCE, IA 52216-0214
PO BOX 215, CLARENCE, IA 52216-0215
PO BOX 216, CLARENCE, IA 52216-0216
PO BOX 217, CLARENCE, IA 52216-0217
PO BOX 218, CLARENCE, IA 52216-0218
PO BOX 219, CLARENCE, IA 52216-0219
PO BOX 220, CLARENCE, IA 52216-0220
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