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, CENTRAL CITY, IA 52214-0011
PO BOX 12, CENTRAL CITY, IA 52214-0012
PO BOX 13, CENTRAL CITY, IA 52214-0013
PO BOX 14, CENTRAL CITY, IA 52214-0014
PO BOX 15, CENTRAL CITY, IA 52214-0015
PO BOX 16, CENTRAL CITY, IA 52214-0016
PO BOX 17, CENTRAL CITY, IA 52214-0017
PO BOX 18, CENTRAL CITY, IA 52214-0018
PO BOX 19, CENTRAL CITY, IA 52214-0019
PO BOX 20, CENTRAL CITY, IA 52214-0020
PO BOX 21, CENTRAL CITY, IA 52214-0021
PO BOX 22, CENTRAL CITY, IA 52214-0022
PO BOX 23, CENTRAL CITY, IA 52214-0023
PO BOX 24, CENTRAL CITY, IA 52214-0024
PO BOX 25, CENTRAL CITY, IA 52214-0025
PO BOX 26, CENTRAL CITY, IA 52214-0026
PO BOX 27, CENTRAL CITY, IA 52214-0027
PO BOX 28, CENTRAL CITY, IA 52214-0028
PO BOX 29, CENTRAL CITY, IA 52214-0029
PO BOX 30, CENTRAL CITY, IA 52214-0030
PO BOX 31, CENTRAL CITY, IA 52214-0031
PO BOX 32, CENTRAL CITY, IA 52214-0032
PO BOX 33, CENTRAL CITY, IA 52214-0033
PO BOX 34, CENTRAL CITY, IA 52214-0034
PO BOX 35, CENTRAL CITY, IA 52214-0035
PO BOX 36, CENTRAL CITY, IA 52214-0036
PO BOX 37, CENTRAL CITY, IA 52214-0037
PO BOX 38, CENTRAL CITY, IA 52214-0038
PO BOX 39, CENTRAL CITY, IA 52214-0039
PO BOX 40, CENTRAL CITY, IA 52214-0040
PO BOX 41, CENTRAL CITY, IA 52214-0041
PO BOX 42, CENTRAL CITY, IA 52214-0042
PO BOX 43, CENTRAL CITY, IA 52214-0043
PO BOX 44, CENTRAL CITY, IA 52214-0044
PO BOX 45, CENTRAL CITY, IA 52214-0045
PO BOX 46, CENTRAL CITY, IA 52214-0046
PO BOX 47, CENTRAL CITY, IA 52214-0047
PO BOX 48, CENTRAL CITY, IA 52214-0048
PO BOX 49, CENTRAL CITY, IA 52214-0049
PO BOX 50, CENTRAL CITY, IA 52214-0050
PO BOX 51, CENTRAL CITY, IA 52214-0051
PO BOX 52, CENTRAL CITY, IA 52214-0052
PO BOX 53, CENTRAL CITY, IA 52214-0053
PO BOX 54, CENTRAL CITY, IA 52214-0054
PO BOX 55, CENTRAL CITY, IA 52214-0055
PO BOX 56, CENTRAL CITY, IA 52214-0056
PO BOX 57, CENTRAL CITY, IA 52214-0057
PO BOX 58, CENTRAL CITY, IA 52214-0058
PO BOX 59, CENTRAL CITY, IA 52214-0059
PO BOX 60, CENTRAL CITY, IA 52214-0060
PO BOX 61, CENTRAL CITY, IA 52214-0061
PO BOX 62, CENTRAL CITY, IA 52214-0062
PO BOX 63, CENTRAL CITY, IA 52214-0063
PO BOX 64, CENTRAL CITY, IA 52214-0064
PO BOX 65, CENTRAL CITY, IA 52214-0065
PO BOX 66, CENTRAL CITY, IA 52214-0066
PO BOX 67, CENTRAL CITY, IA 52214-0067
PO BOX 68, CENTRAL CITY, IA 52214-0068
PO BOX 69, CENTRAL CITY, IA 52214-0069
PO BOX 70, CENTRAL CITY, IA 52214-0070
PO BOX 71, CENTRAL CITY, IA 52214-0071
PO BOX 72, CENTRAL CITY, IA 52214-0072
PO BOX 73, CENTRAL CITY, IA 52214-0073
PO BOX 74, CENTRAL CITY, IA 52214-0074
PO BOX 75, CENTRAL CITY, IA 52214-0075
PO BOX 76, CENTRAL CITY, IA 52214-0076
PO BOX 77, CENTRAL CITY, IA 52214-0077
PO BOX 78, CENTRAL CITY, IA 52214-0078
PO BOX 79, CENTRAL CITY, IA 52214-0079
PO BOX 80, CENTRAL CITY, IA 52214-0080
PO BOX 81, CENTRAL CITY, IA 52214-0081
PO BOX 82, CENTRAL CITY, IA 52214-0082
PO BOX 83, CENTRAL CITY, IA 52214-0083
PO BOX 84, CENTRAL CITY, IA 52214-0084
PO BOX 85, CENTRAL CITY, IA 52214-0085
PO BOX 86, CENTRAL CITY, IA 52214-0086
PO BOX 87, CENTRAL CITY, IA 52214-0087
PO BOX 88, CENTRAL CITY, IA 52214-0088
PO BOX 89, CENTRAL CITY, IA 52214-0089
PO BOX 90, CENTRAL CITY, IA 52214-0090
PO BOX 91, CENTRAL CITY, IA 52214-0091
PO BOX 92, CENTRAL CITY, IA 52214-0092
PO BOX 93, CENTRAL CITY, IA 52214-0093
PO BOX 94, CENTRAL CITY, IA 52214-0094
PO BOX 95, CENTRAL CITY, IA 52214-0095
PO BOX 96, CENTRAL CITY, IA 52214-0096
PO BOX 97, CENTRAL CITY, IA 52214-0097
PO BOX 98, CENTRAL CITY, IA 52214-0098
PO BOX 99, CENTRAL CITY, IA 52214-0099
PO BOX 100, CENTRAL CITY, IA 52214-0100
PO BOX 101, CENTRAL CITY, IA 52214-0101
PO BOX 102, CENTRAL CITY, IA 52214-0102
PO BOX 103, CENTRAL CITY, IA 52214-0103
PO BOX 104, CENTRAL CITY, IA 52214-0104
PO BOX 105, CENTRAL CITY, IA 52214-0105
PO BOX 106, CENTRAL CITY, IA 52214-0106
PO BOX 107, CENTRAL CITY, IA 52214-0107
PO BOX 108, CENTRAL CITY, IA 52214-0108
PO BOX 109, CENTRAL CITY, IA 52214-0109
PO BOX 110, CENTRAL CITY, IA 52214-0110
PO BOX 111, CENTRAL CITY, IA 52214-0111
PO BOX 112, CENTRAL CITY, IA 52214-0112
PO BOX 113, CENTRAL CITY, IA 52214-0113
PO BOX 114, CENTRAL CITY, IA 52214-0114
PO BOX 115, CENTRAL CITY, IA 52214-0115
PO BOX 116, CENTRAL CITY, IA 52214-0116
PO BOX 117, CENTRAL CITY, IA 52214-0117
PO BOX 118, CENTRAL CITY, IA 52214-0118
PO BOX 119, CENTRAL CITY, IA 52214-0119
PO BOX 120, CENTRAL CITY, IA 52214-0120
PO BOX 121, CENTRAL CITY, IA 52214-0121
PO BOX 122, CENTRAL CITY, IA 52214-0122
PO BOX 123, CENTRAL CITY, IA 52214-0123
PO BOX 124, CENTRAL CITY, IA 52214-0124
PO BOX 125, CENTRAL CITY, IA 52214-0125
PO BOX 126, CENTRAL CITY, IA 52214-0126
PO BOX 127, CENTRAL CITY, IA 52214-0127
PO BOX 128, CENTRAL CITY, IA 52214-0128
PO BOX 129, CENTRAL CITY, IA 52214-0129
PO BOX 130, CENTRAL CITY, IA 52214-0130
PO BOX 131, CENTRAL CITY, IA 52214-0131
PO BOX 132, CENTRAL CITY, IA 52214-0132
PO BOX 133, CENTRAL CITY, IA 52214-0133
PO BOX 134, CENTRAL CITY, IA 52214-0134
PO BOX 135, CENTRAL CITY, IA 52214-0135
PO BOX 136, CENTRAL CITY, IA 52214-0136
PO BOX 137, CENTRAL CITY, IA 52214-0137
PO BOX 138, CENTRAL CITY, IA 52214-0138
PO BOX 139, CENTRAL CITY, IA 52214-0139
PO BOX 140, CENTRAL CITY, IA 52214-0140
PO BOX 141, CENTRAL CITY, IA 52214-0141
PO BOX 142, CENTRAL CITY, IA 52214-0142
PO BOX 143, CENTRAL CITY, IA 52214-0143
PO BOX 144, CENTRAL CITY, IA 52214-0144
PO BOX 145, CENTRAL CITY, IA 52214-0145
PO BOX 146, CENTRAL CITY, IA 52214-0146
PO BOX 147, CENTRAL CITY, IA 52214-0147
PO BOX 148, CENTRAL CITY, IA 52214-0148
PO BOX 149, CENTRAL CITY, IA 52214-0149
PO BOX 150, CENTRAL CITY, IA 52214-0150
PO BOX 151, CENTRAL CITY, IA 52214-0151
PO BOX 152, CENTRAL CITY, IA 52214-0152
PO BOX 153, CENTRAL CITY, IA 52214-0153
PO BOX 154, CENTRAL CITY, IA 52214-0154
PO BOX 155, CENTRAL CITY, IA 52214-0155
PO BOX 156, CENTRAL CITY, IA 52214-0156
PO BOX 157, CENTRAL CITY, IA 52214-0157
PO BOX 158, CENTRAL CITY, IA 52214-0158
PO BOX 159, CENTRAL CITY, IA 52214-0159
PO BOX 160, CENTRAL CITY, IA 52214-0160
PO BOX 161, CENTRAL CITY, IA 52214-0161
PO BOX 162, CENTRAL CITY, IA 52214-0162
PO BOX 163, CENTRAL CITY, IA 52214-0163
PO BOX 164, CENTRAL CITY, IA 52214-0164
PO BOX 165, CENTRAL CITY, IA 52214-0165
PO BOX 166, CENTRAL CITY, IA 52214-0166
PO BOX 167, CENTRAL CITY, IA 52214-0167
PO BOX 168, CENTRAL CITY, IA 52214-0168
PO BOX 169, CENTRAL CITY, IA 52214-0169
PO BOX 170, CENTRAL CITY, IA 52214-0170
PO BOX 171, CENTRAL CITY, IA 52214-0171
PO BOX 172, CENTRAL CITY, IA 52214-0172
PO BOX 173, CENTRAL CITY, IA 52214-0173
PO BOX 174, CENTRAL CITY, IA 52214-0174
PO BOX 175, CENTRAL CITY, IA 52214-0175
PO BOX 176, CENTRAL CITY, IA 52214-0176
PO BOX 177, CENTRAL CITY, IA 52214-0177
PO BOX 178, CENTRAL CITY, IA 52214-0178
PO BOX 179, CENTRAL CITY, IA 52214-0179
PO BOX 180, CENTRAL CITY, IA 52214-0180
PO BOX 181, CENTRAL CITY, IA 52214-0181
PO BOX 182, CENTRAL CITY, IA 52214-0182
PO BOX 183, CENTRAL CITY, IA 52214-0183
PO BOX 184, CENTRAL CITY, IA 52214-0184
PO BOX 185, CENTRAL CITY, IA 52214-0185
PO BOX 186, CENTRAL CITY, IA 52214-0186
PO BOX 187, CENTRAL CITY, IA 52214-0187
PO BOX 188, CENTRAL CITY, IA 52214-0188
PO BOX 189, CENTRAL CITY, IA 52214-0189
PO BOX 190, CENTRAL CITY, IA 52214-0190
PO BOX 191, CENTRAL CITY, IA 52214-0191
PO BOX 192, CENTRAL CITY, IA 52214-0192
PO BOX 193, CENTRAL CITY, IA 52214-0193
PO BOX 194, CENTRAL CITY, IA 52214-0194
PO BOX 195, CENTRAL CITY, IA 52214-0195
PO BOX 196, CENTRAL CITY, IA 52214-0196
PO BOX 197, CENTRAL CITY, IA 52214-0197
PO BOX 198, CENTRAL CITY, IA 52214-0198
PO BOX 199, CENTRAL CITY, IA 52214-0199
PO BOX 200, CENTRAL CITY, IA 52214-0200
PO BOX 201, CENTRAL CITY, IA 52214-0201
PO BOX 202, CENTRAL CITY, IA 52214-0202
PO BOX 203, CENTRAL CITY, IA 52214-0203
PO BOX 204, CENTRAL CITY, IA 52214-0204
PO BOX 205, CENTRAL CITY, IA 52214-0205
PO BOX 206, CENTRAL CITY, IA 52214-0206
PO BOX 207, CENTRAL CITY, IA 52214-0207
PO BOX 208, CENTRAL CITY, IA 52214-0208
PO BOX 209, CENTRAL CITY, IA 52214-0209
PO BOX 210, CENTRAL CITY, IA 52214-0210
PO BOX 211, CENTRAL CITY, IA 52214-0211
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