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, CASEY, IA 50048-0011
PO BOX 12, CASEY, IA 50048-0012
PO BOX 13, CASEY, IA 50048-0013
PO BOX 14, CASEY, IA 50048-0014
PO BOX 15, CASEY, IA 50048-0015
PO BOX 16, CASEY, IA 50048-0016
PO BOX 17, CASEY, IA 50048-0017
PO BOX 18, CASEY, IA 50048-0018
PO BOX 19, CASEY, IA 50048-0019
PO BOX 20, CASEY, IA 50048-0020
PO BOX 21, CASEY, IA 50048-0021
PO BOX 22, CASEY, IA 50048-0022
PO BOX 23, CASEY, IA 50048-0023
PO BOX 24, CASEY, IA 50048-0024
PO BOX 25, CASEY, IA 50048-0025
PO BOX 26, CASEY, IA 50048-0026
PO BOX 27, CASEY, IA 50048-0027
PO BOX 28, CASEY, IA 50048-0028
PO BOX 29, CASEY, IA 50048-0029
PO BOX 30, CASEY, IA 50048-0030
PO BOX 31, CASEY, IA 50048-0031
PO BOX 32, CASEY, IA 50048-0032
PO BOX 33, CASEY, IA 50048-0033
PO BOX 34, CASEY, IA 50048-0034
PO BOX 35, CASEY, IA 50048-0035
PO BOX 36, CASEY, IA 50048-0036
PO BOX 37, CASEY, IA 50048-0037
PO BOX 38, CASEY, IA 50048-0038
PO BOX 39, CASEY, IA 50048-0039
PO BOX 40, CASEY, IA 50048-0040
PO BOX 41, CASEY, IA 50048-0041
PO BOX 42, CASEY, IA 50048-0042
PO BOX 43, CASEY, IA 50048-0043
PO BOX 44, CASEY, IA 50048-0044
PO BOX 45, CASEY, IA 50048-0045
PO BOX 46, CASEY, IA 50048-0046
PO BOX 47, CASEY, IA 50048-0047
PO BOX 48, CASEY, IA 50048-0048
PO BOX 49, CASEY, IA 50048-0049
PO BOX 50, CASEY, IA 50048-0050
PO BOX 51, CASEY, IA 50048-0051
PO BOX 52, CASEY, IA 50048-0052
PO BOX 53, CASEY, IA 50048-0053
PO BOX 54, CASEY, IA 50048-0054
PO BOX 55, CASEY, IA 50048-0055
PO BOX 56, CASEY, IA 50048-0056
PO BOX 57, CASEY, IA 50048-0057
PO BOX 58, CASEY, IA 50048-0058
PO BOX 59, CASEY, IA 50048-0059
PO BOX 60, CASEY, IA 50048-0060
PO BOX 61, CASEY, IA 50048-0061
PO BOX 62, CASEY, IA 50048-0062
PO BOX 63, CASEY, IA 50048-0063
PO BOX 64, CASEY, IA 50048-0064
PO BOX 65, CASEY, IA 50048-0065
PO BOX 66, CASEY, IA 50048-0066
PO BOX 67, CASEY, IA 50048-0067
PO BOX 68, CASEY, IA 50048-0068
PO BOX 69, CASEY, IA 50048-0069
PO BOX 70, CASEY, IA 50048-0070
PO BOX 71, CASEY, IA 50048-0071
PO BOX 72, CASEY, IA 50048-0072
PO BOX 73, CASEY, IA 50048-0073
PO BOX 74, CASEY, IA 50048-0074
PO BOX 75, CASEY, IA 50048-0075
PO BOX 76, CASEY, IA 50048-0076
PO BOX 77, CASEY, IA 50048-0077
PO BOX 78, CASEY, IA 50048-0078
PO BOX 79, CASEY, IA 50048-0079
PO BOX 80, CASEY, IA 50048-0080
PO BOX 81, CASEY, IA 50048-0081
PO BOX 82, CASEY, IA 50048-0082
PO BOX 83, CASEY, IA 50048-0083
PO BOX 84, CASEY, IA 50048-0084
PO BOX 85, CASEY, IA 50048-0085
PO BOX 86, CASEY, IA 50048-0086
PO BOX 87, CASEY, IA 50048-0087
PO BOX 88, CASEY, IA 50048-0088
PO BOX 89, CASEY, IA 50048-0089
PO BOX 90, CASEY, IA 50048-0090
PO BOX 91, CASEY, IA 50048-0091
PO BOX 92, CASEY, IA 50048-0092
PO BOX 93, CASEY, IA 50048-0093
PO BOX 94, CASEY, IA 50048-0094
PO BOX 95, CASEY, IA 50048-0095
PO BOX 96, CASEY, IA 50048-0096
PO BOX 97, CASEY, IA 50048-0097
PO BOX 98, CASEY, IA 50048-0098
PO BOX 99, CASEY, IA 50048-0099
PO BOX 100, CASEY, IA 50048-0100
PO BOX 101, CASEY, IA 50048-0101
PO BOX 102, CASEY, IA 50048-0102
PO BOX 103, CASEY, IA 50048-0103
PO BOX 104, CASEY, IA 50048-0104
PO BOX 105, CASEY, IA 50048-0105
PO BOX 106, CASEY, IA 50048-0106
PO BOX 107, CASEY, IA 50048-0107
PO BOX 108, CASEY, IA 50048-0108
PO BOX 109, CASEY, IA 50048-0109
PO BOX 110, CASEY, IA 50048-0110
PO BOX 111, CASEY, IA 50048-0111
PO BOX 112, CASEY, IA 50048-0112
PO BOX 113, CASEY, IA 50048-0113
PO BOX 114, CASEY, IA 50048-0114
PO BOX 115, CASEY, IA 50048-0115
PO BOX 116, CASEY, IA 50048-0116
PO BOX 117, CASEY, IA 50048-0117
PO BOX 118, CASEY, IA 50048-0118
PO BOX 119, CASEY, IA 50048-0119
PO BOX 120, CASEY, IA 50048-0120
PO BOX 121, CASEY, IA 50048-0121
PO BOX 122, CASEY, IA 50048-0122
PO BOX 123, CASEY, IA 50048-0123
PO BOX 124, CASEY, IA 50048-0124
PO BOX 125, CASEY, IA 50048-0125
PO BOX 126, CASEY, IA 50048-0126
PO BOX 127, CASEY, IA 50048-0127
PO BOX 128, CASEY, IA 50048-0128
PO BOX 129, CASEY, IA 50048-0129
PO BOX 130, CASEY, IA 50048-0130
PO BOX 131, CASEY, IA 50048-0131
PO BOX 132, CASEY, IA 50048-0132
PO BOX 133, CASEY, IA 50048-0133
PO BOX 134, CASEY, IA 50048-0134
PO BOX 135, CASEY, IA 50048-0135
PO BOX 136, CASEY, IA 50048-0136
PO BOX 137, CASEY, IA 50048-0137
PO BOX 138, CASEY, IA 50048-0138
PO BOX 139, CASEY, IA 50048-0139
PO BOX 140, CASEY, IA 50048-0140
PO BOX 141, CASEY, IA 50048-0141
PO BOX 142, CASEY, IA 50048-0142
PO BOX 143, CASEY, IA 50048-0143
PO BOX 144, CASEY, IA 50048-0144
PO BOX 145, CASEY, IA 50048-0145
PO BOX 146, CASEY, IA 50048-0146
PO BOX 147, CASEY, IA 50048-0147
PO BOX 148, CASEY, IA 50048-0148
PO BOX 149, CASEY, IA 50048-0149
PO BOX 150, CASEY, IA 50048-0150
PO BOX 151, CASEY, IA 50048-0151
PO BOX 152, CASEY, IA 50048-0152
PO BOX 153, CASEY, IA 50048-0153
PO BOX 154, CASEY, IA 50048-0154
PO BOX 155, CASEY, IA 50048-0155
PO BOX 156, CASEY, IA 50048-0156
PO BOX 157, CASEY, IA 50048-0157
PO BOX 158, CASEY, IA 50048-0158
PO BOX 159, CASEY, IA 50048-0159
PO BOX 160, CASEY, IA 50048-0160
PO BOX 161, CASEY, IA 50048-0161
PO BOX 162, CASEY, IA 50048-0162
PO BOX 163, CASEY, IA 50048-0163
PO BOX 164, CASEY, IA 50048-0164
PO BOX 165, CASEY, IA 50048-0165
PO BOX 166, CASEY, IA 50048-0166
PO BOX 167, CASEY, IA 50048-0167
PO BOX 168, CASEY, IA 50048-0168
PO BOX 169, CASEY, IA 50048-0169
PO BOX 170, CASEY, IA 50048-0170
PO BOX 171, CASEY, IA 50048-0171
PO BOX 172, CASEY, IA 50048-0172
PO BOX 173, CASEY, IA 50048-0173
PO BOX 174, CASEY, IA 50048-0174
PO BOX 175, CASEY, IA 50048-0175
PO BOX 176, CASEY, IA 50048-0176
PO BOX 177, CASEY, IA 50048-0177
PO BOX 178, CASEY, IA 50048-0178
PO BOX 179, CASEY, IA 50048-0179
PO BOX 180, CASEY, IA 50048-0180
PO BOX 181, CASEY, IA 50048-0181
PO BOX 182, CASEY, IA 50048-0182
PO BOX 183, CASEY, IA 50048-0183
PO BOX 184, CASEY, IA 50048-0184
PO BOX 185, CASEY, IA 50048-0185
PO BOX 186, CASEY, IA 50048-0186
PO BOX 187, CASEY, IA 50048-0187
PO BOX 188, CASEY, IA 50048-0188
PO BOX 189, CASEY, IA 50048-0189
PO BOX 190, CASEY, IA 50048-0190
PO BOX 191, CASEY, IA 50048-0191
PO BOX 192, CASEY, IA 50048-0192
PO BOX 193, CASEY, IA 50048-0193
PO BOX 194, CASEY, IA 50048-0194
PO BOX 195, CASEY, IA 50048-0195
PO BOX 196, CASEY, IA 50048-0196
PO BOX 197, CASEY, IA 50048-0197
PO BOX 198, CASEY, IA 50048-0198
PO BOX 199, CASEY, IA 50048-0199
PO BOX 200, CASEY, IA 50048-0200
PO BOX 201, CASEY, IA 50048-0201
PO BOX 202, CASEY, IA 50048-0202
PO BOX 203, CASEY, IA 50048-0203
PO BOX 204, CASEY, IA 50048-0204
PO BOX 205, CASEY, IA 50048-0205
PO BOX 206, CASEY, IA 50048-0206
PO BOX 207, CASEY, IA 50048-0207
PO BOX 208, CASEY, IA 50048-0208
PO BOX 209, CASEY, IA 50048-0209
PO BOX 210, CASEY, IA 50048-0210
PO BOX 211, CASEY, IA 50048-0211
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