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, GARNER, IA 50438-0001
PO BOX 2, GARNER, IA 50438-0002
PO BOX 3, GARNER, IA 50438-0003
PO BOX 4, GARNER, IA 50438-0004
PO BOX 5, GARNER, IA 50438-0005
PO BOX 6, GARNER, IA 50438-0006
PO BOX 7, GARNER, IA 50438-0007
PO BOX 8, GARNER, IA 50438-0008
PO BOX 9, GARNER, IA 50438-0009
PO BOX 10, GARNER, IA 50438-0010
PO BOX 11, GARNER, IA 50438-0011
PO BOX 12, GARNER, IA 50438-0012
PO BOX 13, GARNER, IA 50438-0013
PO BOX 14, GARNER, IA 50438-0014
PO BOX 15, GARNER, IA 50438-0015
PO BOX 16, GARNER, IA 50438-0016
PO BOX 17, GARNER, IA 50438-0017
PO BOX 18, GARNER, IA 50438-0018
PO BOX 19, GARNER, IA 50438-0019
PO BOX 20, GARNER, IA 50438-0020
PO BOX 21, GARNER, IA 50438-0021
PO BOX 22, GARNER, IA 50438-0022
PO BOX 23, GARNER, IA 50438-0023
PO BOX 24, GARNER, IA 50438-0024
PO BOX 25, GARNER, IA 50438-0025
PO BOX 26, GARNER, IA 50438-0026
PO BOX 27, GARNER, IA 50438-0027
PO BOX 28, GARNER, IA 50438-0028
PO BOX 29, GARNER, IA 50438-0029
PO BOX 30, GARNER, IA 50438-0030
PO BOX 31, GARNER, IA 50438-0031
PO BOX 32, GARNER, IA 50438-0032
PO BOX 33, GARNER, IA 50438-0033
PO BOX 34, GARNER, IA 50438-0034
PO BOX 35, GARNER, IA 50438-0035
PO BOX 36, GARNER, IA 50438-0036
PO BOX 37, GARNER, IA 50438-0037
PO BOX 38, GARNER, IA 50438-0038
PO BOX 39, GARNER, IA 50438-0039
PO BOX 40, GARNER, IA 50438-0040
PO BOX 41, GARNER, IA 50438-0041
PO BOX 42, GARNER, IA 50438-0042
PO BOX 43, GARNER, IA 50438-0043
PO BOX 44, GARNER, IA 50438-0044
PO BOX 45, GARNER, IA 50438-0045
PO BOX 46, GARNER, IA 50438-0046
PO BOX 47, GARNER, IA 50438-0047
PO BOX 48, GARNER, IA 50438-0048
PO BOX 49, GARNER, IA 50438-0049
PO BOX 50, GARNER, IA 50438-0050
PO BOX 51, GARNER, IA 50438-0051
PO BOX 52, GARNER, IA 50438-0052
PO BOX 53, GARNER, IA 50438-0053
PO BOX 54, GARNER, IA 50438-0054
PO BOX 55, GARNER, IA 50438-0055
PO BOX 56, GARNER, IA 50438-0056
PO BOX 57, GARNER, IA 50438-0057
PO BOX 58, GARNER, IA 50438-0058
PO BOX 59, GARNER, IA 50438-0059
PO BOX 60, GARNER, IA 50438-0060
PO BOX 61, GARNER, IA 50438-0061
PO BOX 62, GARNER, IA 50438-0062
PO BOX 63, GARNER, IA 50438-0063
PO BOX 64, GARNER, IA 50438-0064
PO BOX 65, GARNER, IA 50438-0065
PO BOX 66, GARNER, IA 50438-0066
PO BOX 67, GARNER, IA 50438-0067
PO BOX 68, GARNER, IA 50438-0068
PO BOX 69, GARNER, IA 50438-0069
PO BOX 70, GARNER, IA 50438-0070
PO BOX 71, GARNER, IA 50438-0071
PO BOX 72, GARNER, IA 50438-0072
PO BOX 73, GARNER, IA 50438-0073
PO BOX 74, GARNER, IA 50438-0074
PO BOX 75, GARNER, IA 50438-0075
PO BOX 76, GARNER, IA 50438-0076
PO BOX 77, GARNER, IA 50438-0077
PO BOX 78, GARNER, IA 50438-0078
PO BOX 79, GARNER, IA 50438-0079
PO BOX 80, GARNER, IA 50438-0080
PO BOX 81, GARNER, IA 50438-0081
PO BOX 82, GARNER, IA 50438-0082
PO BOX 83, GARNER, IA 50438-0083
PO BOX 84, GARNER, IA 50438-0084
PO BOX 85, GARNER, IA 50438-0085
PO BOX 86, GARNER, IA 50438-0086
PO BOX 87, GARNER, IA 50438-0087
PO BOX 88, GARNER, IA 50438-0088
PO BOX 89, GARNER, IA 50438-0089
PO BOX 90, GARNER, IA 50438-0090
PO BOX 91, GARNER, IA 50438-0091
PO BOX 92, GARNER, IA 50438-0092
PO BOX 93, GARNER, IA 50438-0093
PO BOX 94, GARNER, IA 50438-0094
PO BOX 95, GARNER, IA 50438-0095
PO BOX 96, GARNER, IA 50438-0096
PO BOX 97, GARNER, IA 50438-0097
PO BOX 98, GARNER, IA 50438-0098
PO BOX 99, GARNER, IA 50438-0099
PO BOX 100, GARNER, IA 50438-0100
PO BOX 101, GARNER, IA 50438-0101
PO BOX 102, GARNER, IA 50438-0102
PO BOX 103, GARNER, IA 50438-0103
PO BOX 104, GARNER, IA 50438-0104
PO BOX 105, GARNER, IA 50438-0105
PO BOX 106, GARNER, IA 50438-0106
PO BOX 107, GARNER, IA 50438-0107
PO BOX 108, GARNER, IA 50438-0108
PO BOX 109, GARNER, IA 50438-0109
PO BOX 110, GARNER, IA 50438-0110
PO BOX 111, GARNER, IA 50438-0111
PO BOX 112, GARNER, IA 50438-0112
PO BOX 113, GARNER, IA 50438-0113
PO BOX 114, GARNER, IA 50438-0114
PO BOX 115, GARNER, IA 50438-0115
PO BOX 116, GARNER, IA 50438-0116
PO BOX 117, GARNER, IA 50438-0117
PO BOX 118, GARNER, IA 50438-0118
PO BOX 119, GARNER, IA 50438-0119
PO BOX 120, GARNER, IA 50438-0120
PO BOX 121, GARNER, IA 50438-0121
PO BOX 122, GARNER, IA 50438-0122
PO BOX 123, GARNER, IA 50438-0123
PO BOX 124, GARNER, IA 50438-0124
PO BOX 125, GARNER, IA 50438-0125
PO BOX 126, GARNER, IA 50438-0126
PO BOX 127, GARNER, IA 50438-0127
PO BOX 128, GARNER, IA 50438-0128
PO BOX 129, GARNER, IA 50438-0129
PO BOX 130, GARNER, IA 50438-0130
PO BOX 131, GARNER, IA 50438-0131
PO BOX 132, GARNER, IA 50438-0132
PO BOX 133, GARNER, IA 50438-0133
PO BOX 134, GARNER, IA 50438-0134
PO BOX 135, GARNER, IA 50438-0135
PO BOX 136, GARNER, IA 50438-0136
PO BOX 137, GARNER, IA 50438-0137
PO BOX 138, GARNER, IA 50438-0138
PO BOX 139, GARNER, IA 50438-0139
PO BOX 140, GARNER, IA 50438-0140
PO BOX 141, GARNER, IA 50438-0141
PO BOX 142, GARNER, IA 50438-0142
PO BOX 143, GARNER, IA 50438-0143
PO BOX 144, GARNER, IA 50438-0144
PO BOX 145, GARNER, IA 50438-0145
PO BOX 146, GARNER, IA 50438-0146
PO BOX 147, GARNER, IA 50438-0147
PO BOX 148, GARNER, IA 50438-0148
PO BOX 149, GARNER, IA 50438-0149
PO BOX 150, GARNER, IA 50438-0150
PO BOX 151, GARNER, IA 50438-0151
PO BOX 152, GARNER, IA 50438-0152
PO BOX 153, GARNER, IA 50438-0153
PO BOX 154, GARNER, IA 50438-0154
PO BOX 155, GARNER, IA 50438-0155
PO BOX 156, GARNER, IA 50438-0156
PO BOX 157, GARNER, IA 50438-0157
PO BOX 158, GARNER, IA 50438-0158
PO BOX 159, GARNER, IA 50438-0159
PO BOX 160, GARNER, IA 50438-0160
PO BOX 161, GARNER, IA 50438-0161
PO BOX 162, GARNER, IA 50438-0162
PO BOX 163, GARNER, IA 50438-0163
PO BOX 164, GARNER, IA 50438-0164
PO BOX 165, GARNER, IA 50438-0165
PO BOX 166, GARNER, IA 50438-0166
PO BOX 167, GARNER, IA 50438-0167
PO BOX 168, GARNER, IA 50438-0168
PO BOX 169, GARNER, IA 50438-0169
PO BOX 170, GARNER, IA 50438-0170
PO BOX 171, GARNER, IA 50438-0171
PO BOX 172, GARNER, IA 50438-0172
PO BOX 173, GARNER, IA 50438-0173
PO BOX 174, GARNER, IA 50438-0174
PO BOX 175, GARNER, IA 50438-0175
PO BOX 176, GARNER, IA 50438-0176
PO BOX 177, GARNER, IA 50438-0177
PO BOX 178, GARNER, IA 50438-0178
PO BOX 179, GARNER, IA 50438-0179
PO BOX 180, GARNER, IA 50438-0180
PO BOX 181, GARNER, IA 50438-0181
PO BOX 182, GARNER, IA 50438-0182
PO BOX 183, GARNER, IA 50438-0183
PO BOX 184, GARNER, IA 50438-0184
PO BOX 185, GARNER, IA 50438-0185
PO BOX 186, GARNER, IA 50438-0186
PO BOX 187, GARNER, IA 50438-0187
PO BOX 188, GARNER, IA 50438-0188
PO BOX 189, GARNER, IA 50438-0189
PO BOX 190, GARNER, IA 50438-0190
PO BOX 191, GARNER, IA 50438-0191
PO BOX 192, GARNER, IA 50438-0192
PO BOX 193, GARNER, IA 50438-0193
PO BOX 194, GARNER, IA 50438-0194
PO BOX 195, GARNER, IA 50438-0195
PO BOX 196, GARNER, IA 50438-0196
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