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 11, POLK CITY, IA 50226-0011
PO BOX 12, POLK CITY, IA 50226-0012
PO BOX 13, POLK CITY, IA 50226-0013
PO BOX 14, POLK CITY, IA 50226-0014
PO BOX 15, POLK CITY, IA 50226-0015
PO BOX 16, POLK CITY, IA 50226-0016
PO BOX 17, POLK CITY, IA 50226-0017
PO BOX 18, POLK CITY, IA 50226-0018
PO BOX 19, POLK CITY, IA 50226-0019
PO BOX 20, POLK CITY, IA 50226-0020
PO BOX 21, POLK CITY, IA 50226-0021
PO BOX 22, POLK CITY, IA 50226-0022
PO BOX 23, POLK CITY, IA 50226-0023
PO BOX 24, POLK CITY, IA 50226-0024
PO BOX 25, POLK CITY, IA 50226-0025
PO BOX 26, POLK CITY, IA 50226-0026
PO BOX 27, POLK CITY, IA 50226-0027
PO BOX 28, POLK CITY, IA 50226-0028
PO BOX 29, POLK CITY, IA 50226-0029
PO BOX 30, POLK CITY, IA 50226-0030
PO BOX 31, POLK CITY, IA 50226-0031
PO BOX 32, POLK CITY, IA 50226-0032
PO BOX 33, POLK CITY, IA 50226-0033
PO BOX 34, POLK CITY, IA 50226-0034
PO BOX 35, POLK CITY, IA 50226-0035
PO BOX 36, POLK CITY, IA 50226-0036
PO BOX 37, POLK CITY, IA 50226-0037
PO BOX 38, POLK CITY, IA 50226-0038
PO BOX 39, POLK CITY, IA 50226-0039
PO BOX 40, POLK CITY, IA 50226-0040
PO BOX 41, POLK CITY, IA 50226-0041
PO BOX 42, POLK CITY, IA 50226-0042
PO BOX 43, POLK CITY, IA 50226-0043
PO BOX 44, POLK CITY, IA 50226-0044
PO BOX 45, POLK CITY, IA 50226-0045
PO BOX 46, POLK CITY, IA 50226-0046
PO BOX 47, POLK CITY, IA 50226-0047
PO BOX 48, POLK CITY, IA 50226-0048
PO BOX 49, POLK CITY, IA 50226-0049
PO BOX 50, POLK CITY, IA 50226-0050
PO BOX 51, POLK CITY, IA 50226-0051
PO BOX 52, POLK CITY, IA 50226-0052
PO BOX 53, POLK CITY, IA 50226-0053
PO BOX 54, POLK CITY, IA 50226-0054
PO BOX 55, POLK CITY, IA 50226-0055
PO BOX 56, POLK CITY, IA 50226-0056
PO BOX 57, POLK CITY, IA 50226-0057
PO BOX 58, POLK CITY, IA 50226-0058
PO BOX 59, POLK CITY, IA 50226-0059
PO BOX 60, POLK CITY, IA 50226-0060
PO BOX 61, POLK CITY, IA 50226-0061
PO BOX 62, POLK CITY, IA 50226-0062
PO BOX 63, POLK CITY, IA 50226-0063
PO BOX 64, POLK CITY, IA 50226-0064
PO BOX 65, POLK CITY, IA 50226-0065
PO BOX 66, POLK CITY, IA 50226-0066
PO BOX 67, POLK CITY, IA 50226-0067
PO BOX 68, POLK CITY, IA 50226-0068
PO BOX 69, POLK CITY, IA 50226-0069
PO BOX 70, POLK CITY, IA 50226-0070
PO BOX 71, POLK CITY, IA 50226-0071
PO BOX 72, POLK CITY, IA 50226-0072
PO BOX 73, POLK CITY, IA 50226-0073
PO BOX 74, POLK CITY, IA 50226-0074
PO BOX 75, POLK CITY, IA 50226-0075
PO BOX 76, POLK CITY, IA 50226-0076
PO BOX 77, POLK CITY, IA 50226-0077
PO BOX 78, POLK CITY, IA 50226-0078
PO BOX 79, POLK CITY, IA 50226-0079
PO BOX 80, POLK CITY, IA 50226-0080
PO BOX 81, POLK CITY, IA 50226-0081
PO BOX 82, POLK CITY, IA 50226-0082
PO BOX 83, POLK CITY, IA 50226-0083
PO BOX 84, POLK CITY, IA 50226-0084
PO BOX 85, POLK CITY, IA 50226-0085
PO BOX 86, POLK CITY, IA 50226-0086
PO BOX 87, POLK CITY, IA 50226-0087
PO BOX 88, POLK CITY, IA 50226-0088
PO BOX 89, POLK CITY, IA 50226-0089
PO BOX 90, POLK CITY, IA 50226-0090
PO BOX 91, POLK CITY, IA 50226-0091
PO BOX 92, POLK CITY, IA 50226-0092
PO BOX 93, POLK CITY, IA 50226-0093
PO BOX 94, POLK CITY, IA 50226-0094
PO BOX 95, POLK CITY, IA 50226-0095
PO BOX 96, POLK CITY, IA 50226-0096
PO BOX 97, POLK CITY, IA 50226-0097
PO BOX 98, POLK CITY, IA 50226-0098
PO BOX 99, POLK CITY, IA 50226-0099
PO BOX 100, POLK CITY, IA 50226-0100
PO BOX 101, POLK CITY, IA 50226-0101
PO BOX 102, POLK CITY, IA 50226-0102
PO BOX 103, POLK CITY, IA 50226-0103
PO BOX 104, POLK CITY, IA 50226-0104
PO BOX 105, POLK CITY, IA 50226-0105
PO BOX 106, POLK CITY, IA 50226-0106
PO BOX 107, POLK CITY, IA 50226-0107
PO BOX 108, POLK CITY, IA 50226-0108
PO BOX 109, POLK CITY, IA 50226-0109
PO BOX 110, POLK CITY, IA 50226-0110
PO BOX 111, POLK CITY, IA 50226-0111
PO BOX 112, POLK CITY, IA 50226-0112
PO BOX 113, POLK CITY, IA 50226-0113
PO BOX 114, POLK CITY, IA 50226-0114
PO BOX 115, POLK CITY, IA 50226-0115
PO BOX 116, POLK CITY, IA 50226-0116
PO BOX 117, POLK CITY, IA 50226-0117
PO BOX 118, POLK CITY, IA 50226-0118
PO BOX 119, POLK CITY, IA 50226-0119
PO BOX 120, POLK CITY, IA 50226-0120
PO BOX 121, POLK CITY, IA 50226-0121
PO BOX 122, POLK CITY, IA 50226-0122
PO BOX 123, POLK CITY, IA 50226-0123
PO BOX 124, POLK CITY, IA 50226-0124
PO BOX 125, POLK CITY, IA 50226-0125
PO BOX 126, POLK CITY, IA 50226-0126
PO BOX 127, POLK CITY, IA 50226-0127
PO BOX 128, POLK CITY, IA 50226-0128
PO BOX 129, POLK CITY, IA 50226-0129
PO BOX 130, POLK CITY, IA 50226-0130
PO BOX 131, POLK CITY, IA 50226-0131
PO BOX 132, POLK CITY, IA 50226-0132
PO BOX 133, POLK CITY, IA 50226-0133
PO BOX 134, POLK CITY, IA 50226-0134
PO BOX 135, POLK CITY, IA 50226-0135
PO BOX 136, POLK CITY, IA 50226-0136
PO BOX 137, POLK CITY, IA 50226-0137
PO BOX 138, POLK CITY, IA 50226-0138
PO BOX 139, POLK CITY, IA 50226-0139
PO BOX 140, POLK CITY, IA 50226-0140
PO BOX 141, POLK CITY, IA 50226-0141
PO BOX 142, POLK CITY, IA 50226-0142
PO BOX 143, POLK CITY, IA 50226-0143
PO BOX 144, POLK CITY, IA 50226-0144
PO BOX 145, POLK CITY, IA 50226-0145
PO BOX 146, POLK CITY, IA 50226-0146
PO BOX 147, POLK CITY, IA 50226-0147
PO BOX 148, POLK CITY, IA 50226-0148
PO BOX 149, POLK CITY, IA 50226-0149
PO BOX 150, POLK CITY, IA 50226-0150
PO BOX 151, POLK CITY, IA 50226-0151
PO BOX 152, POLK CITY, IA 50226-0152
PO BOX 153, POLK CITY, IA 50226-0153
PO BOX 154, POLK CITY, IA 50226-0154
PO BOX 155, POLK CITY, IA 50226-0155
PO BOX 156, POLK CITY, IA 50226-0156
PO BOX 157, POLK CITY, IA 50226-0157
PO BOX 158, POLK CITY, IA 50226-0158
PO BOX 159, POLK CITY, IA 50226-0159
PO BOX 160, POLK CITY, IA 50226-0160
PO BOX 161, POLK CITY, IA 50226-0161
PO BOX 162, POLK CITY, IA 50226-0162
PO BOX 163, POLK CITY, IA 50226-0163
PO BOX 164, POLK CITY, IA 50226-0164
PO BOX 165, POLK CITY, IA 50226-0165
PO BOX 166, POLK CITY, IA 50226-0166
PO BOX 167, POLK CITY, IA 50226-0167
PO BOX 168, POLK CITY, IA 50226-0168
PO BOX 169, POLK CITY, IA 50226-0169
PO BOX 170, POLK CITY, IA 50226-0170
PO BOX 171, POLK CITY, IA 50226-0171
PO BOX 172, POLK CITY, IA 50226-0172
PO BOX 173, POLK CITY, IA 50226-0173
PO BOX 174, POLK CITY, IA 50226-0174
PO BOX 175, POLK CITY, IA 50226-0175
PO BOX 176, POLK CITY, IA 50226-0176
PO BOX 177, POLK CITY, IA 50226-0177
PO BOX 178, POLK CITY, IA 50226-0178
PO BOX 179, POLK CITY, IA 50226-0179
PO BOX 180, POLK CITY, IA 50226-0180
PO BOX 181, POLK CITY, IA 50226-0181
PO BOX 182, POLK CITY, IA 50226-0182
PO BOX 183, POLK CITY, IA 50226-0183
PO BOX 184, POLK CITY, IA 50226-0184
PO BOX 185, POLK CITY, IA 50226-0185
PO BOX 186, POLK CITY, IA 50226-0186
PO BOX 187, POLK CITY, IA 50226-0187
PO BOX 188, POLK CITY, IA 50226-0188
PO BOX 189, POLK CITY, IA 50226-0189
PO BOX 190, POLK CITY, IA 50226-0190
PO BOX 191, POLK CITY, IA 50226-0191
PO BOX 192, POLK CITY, IA 50226-0192
PO BOX 193, POLK CITY, IA 50226-0193
PO BOX 194, POLK CITY, IA 50226-0194
PO BOX 195, POLK CITY, IA 50226-0195
PO BOX 196, POLK CITY, IA 50226-0196
PO BOX 197, POLK CITY, IA 50226-0197
PO BOX 198, POLK CITY, IA 50226-0198
PO BOX 199, POLK CITY, IA 50226-0199
PO BOX 200, POLK CITY, IA 50226-0200
PO BOX 201, POLK CITY, IA 50226-0201
PO BOX 202, POLK CITY, IA 50226-0202
PO BOX 203, POLK CITY, IA 50226-0203
PO BOX 204, POLK CITY, IA 50226-0204
PO BOX 205, POLK CITY, IA 50226-0205
PO BOX 206, POLK CITY, IA 50226-0206
PO BOX 207, POLK CITY, IA 50226-0207
PO BOX 208, POLK CITY, IA 50226-0208
PO BOX 209, POLK CITY, IA 50226-0209
PO BOX 210, POLK CITY, IA 50226-0210
PO BOX 211, POLK CITY, IA 50226-0211
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