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, AUBURN, IA 51433-0001
PO BOX 2, AUBURN, IA 51433-0002
PO BOX 3, AUBURN, IA 51433-0003
PO BOX 4, AUBURN, IA 51433-0004
PO BOX 5, AUBURN, IA 51433-0005
PO BOX 6, AUBURN, IA 51433-0006
PO BOX 7, AUBURN, IA 51433-0007
PO BOX 8, AUBURN, IA 51433-0008
PO BOX 9, AUBURN, IA 51433-0009
PO BOX 10, AUBURN, IA 51433-0010
PO BOX 11, AUBURN, IA 51433-0011
PO BOX 12, AUBURN, IA 51433-0012
PO BOX 13, AUBURN, IA 51433-0013
PO BOX 14, AUBURN, IA 51433-0014
PO BOX 15, AUBURN, IA 51433-0015
PO BOX 16, AUBURN, IA 51433-0016
PO BOX 17, AUBURN, IA 51433-0017
PO BOX 18, AUBURN, IA 51433-0018
PO BOX 19, AUBURN, IA 51433-0019
PO BOX 20, AUBURN, IA 51433-0020
PO BOX 21, AUBURN, IA 51433-0021
PO BOX 22, AUBURN, IA 51433-0022
PO BOX 23, AUBURN, IA 51433-0023
PO BOX 24, AUBURN, IA 51433-0024
PO BOX 25, AUBURN, IA 51433-0025
PO BOX 26, AUBURN, IA 51433-0026
PO BOX 27, AUBURN, IA 51433-0027
PO BOX 28, AUBURN, IA 51433-0028
PO BOX 29, AUBURN, IA 51433-0029
PO BOX 30, AUBURN, IA 51433-0030
PO BOX 31, AUBURN, IA 51433-0031
PO BOX 32, AUBURN, IA 51433-0032
PO BOX 33, AUBURN, IA 51433-0033
PO BOX 34, AUBURN, IA 51433-0034
PO BOX 35, AUBURN, IA 51433-0035
PO BOX 36, AUBURN, IA 51433-0036
PO BOX 37, AUBURN, IA 51433-0037
PO BOX 38, AUBURN, IA 51433-0038
PO BOX 39, AUBURN, IA 51433-0039
PO BOX 40, AUBURN, IA 51433-0040
PO BOX 41, AUBURN, IA 51433-0041
PO BOX 42, AUBURN, IA 51433-0042
PO BOX 43, AUBURN, IA 51433-0043
PO BOX 44, AUBURN, IA 51433-0044
PO BOX 45, AUBURN, IA 51433-0045
PO BOX 46, AUBURN, IA 51433-0046
PO BOX 47, AUBURN, IA 51433-0047
PO BOX 48, AUBURN, IA 51433-0048
PO BOX 49, AUBURN, IA 51433-0049
PO BOX 50, AUBURN, IA 51433-0050
PO BOX 51, AUBURN, IA 51433-0051
PO BOX 52, AUBURN, IA 51433-0052
PO BOX 53, AUBURN, IA 51433-0053
PO BOX 54, AUBURN, IA 51433-0054
PO BOX 55, AUBURN, IA 51433-0055
PO BOX 56, AUBURN, IA 51433-0056
PO BOX 57, AUBURN, IA 51433-0057
PO BOX 58, AUBURN, IA 51433-0058
PO BOX 59, AUBURN, IA 51433-0059
PO BOX 60, AUBURN, IA 51433-0060
PO BOX 61, AUBURN, IA 51433-0061
PO BOX 62, AUBURN, IA 51433-0062
PO BOX 63, AUBURN, IA 51433-0063
PO BOX 64, AUBURN, IA 51433-0064
PO BOX 65, AUBURN, IA 51433-0065
PO BOX 66, AUBURN, IA 51433-0066
PO BOX 67, AUBURN, IA 51433-0067
PO BOX 68, AUBURN, IA 51433-0068
PO BOX 69, AUBURN, IA 51433-0069
PO BOX 70, AUBURN, IA 51433-0070
PO BOX 71, AUBURN, IA 51433-0071
PO BOX 72, AUBURN, IA 51433-0072
PO BOX 73, AUBURN, IA 51433-0073
PO BOX 74, AUBURN, IA 51433-0074
PO BOX 75, AUBURN, IA 51433-0075
PO BOX 76, AUBURN, IA 51433-0076
PO BOX 77, AUBURN, IA 51433-0077
PO BOX 78, AUBURN, IA 51433-0078
PO BOX 79, AUBURN, IA 51433-0079
PO BOX 80, AUBURN, IA 51433-0080
PO BOX 81, AUBURN, IA 51433-0081
PO BOX 82, AUBURN, IA 51433-0082
PO BOX 83, AUBURN, IA 51433-0083
PO BOX 84, AUBURN, IA 51433-0084
PO BOX 85, AUBURN, IA 51433-0085
PO BOX 86, AUBURN, IA 51433-0086
PO BOX 87, AUBURN, IA 51433-0087
PO BOX 88, AUBURN, IA 51433-0088
PO BOX 89, AUBURN, IA 51433-0089
PO BOX 90, AUBURN, IA 51433-0090
PO BOX 91, AUBURN, IA 51433-0091
PO BOX 92, AUBURN, IA 51433-0092
PO BOX 93, AUBURN, IA 51433-0093
PO BOX 94, AUBURN, IA 51433-0094
PO BOX 95, AUBURN, IA 51433-0095
PO BOX 96, AUBURN, IA 51433-0096
PO BOX 97, AUBURN, IA 51433-0097
PO BOX 98, AUBURN, IA 51433-0098
PO BOX 99, AUBURN, IA 51433-0099
PO BOX 100, AUBURN, IA 51433-0100
PO BOX 101, AUBURN, IA 51433-0101
PO BOX 102, AUBURN, IA 51433-0102
PO BOX 103, AUBURN, IA 51433-0103
PO BOX 104, AUBURN, IA 51433-0104
PO BOX 105, AUBURN, IA 51433-0105
PO BOX 106, AUBURN, IA 51433-0106
PO BOX 107, AUBURN, IA 51433-0107
PO BOX 108, AUBURN, IA 51433-0108
PO BOX 109, AUBURN, IA 51433-0109
PO BOX 110, AUBURN, IA 51433-0110
PO BOX 111, AUBURN, IA 51433-0111
PO BOX 112, AUBURN, IA 51433-0112
PO BOX 113, AUBURN, IA 51433-0113
PO BOX 114, AUBURN, IA 51433-0114
PO BOX 115, AUBURN, IA 51433-0115
PO BOX 116, AUBURN, IA 51433-0116
PO BOX 117, AUBURN, IA 51433-0117
PO BOX 118, AUBURN, IA 51433-0118
PO BOX 119, AUBURN, IA 51433-0119
PO BOX 120, AUBURN, IA 51433-0120
PO BOX 121, AUBURN, IA 51433-0121
PO BOX 122, AUBURN, IA 51433-0122
PO BOX 123, AUBURN, IA 51433-0123
PO BOX 124, AUBURN, IA 51433-0124
PO BOX 125, AUBURN, IA 51433-0125
PO BOX 126, AUBURN, IA 51433-0126
PO BOX 127, AUBURN, IA 51433-0127
PO BOX 128, AUBURN, IA 51433-0128
PO BOX 129, AUBURN, IA 51433-0129
PO BOX 130, AUBURN, IA 51433-0130
PO BOX 131, AUBURN, IA 51433-0131
PO BOX 132, AUBURN, IA 51433-0132
PO BOX 133, AUBURN, IA 51433-0133
PO BOX 134, AUBURN, IA 51433-0134
PO BOX 135, AUBURN, IA 51433-0135
PO BOX 136, AUBURN, IA 51433-0136
PO BOX 137, AUBURN, IA 51433-0137
PO BOX 138, AUBURN, IA 51433-0138
PO BOX 139, AUBURN, IA 51433-0139
PO BOX 140, AUBURN, IA 51433-0140
PO BOX 141, AUBURN, IA 51433-0141
PO BOX 142, AUBURN, IA 51433-0142
PO BOX 143, AUBURN, IA 51433-0143
PO BOX 144, AUBURN, IA 51433-0144
PO BOX 145, AUBURN, IA 51433-0145
PO BOX 146, AUBURN, IA 51433-0146
PO BOX 147, AUBURN, IA 51433-0147
PO BOX 148, AUBURN, IA 51433-0148
PO BOX 149, AUBURN, IA 51433-0149
PO BOX 150, AUBURN, IA 51433-0150
PO BOX 151, AUBURN, IA 51433-0151
PO BOX 152, AUBURN, IA 51433-0152
PO BOX 153, AUBURN, IA 51433-0153
PO BOX 154, AUBURN, IA 51433-0154
PO BOX 155, AUBURN, IA 51433-0155
PO BOX 156, AUBURN, IA 51433-0156
PO BOX 157, AUBURN, IA 51433-0157
PO BOX 158, AUBURN, IA 51433-0158
PO BOX 159, AUBURN, IA 51433-0159
PO BOX 160, AUBURN, IA 51433-0160
PO BOX 161, AUBURN, IA 51433-0161
PO BOX 162, AUBURN, IA 51433-0162
PO BOX 163, AUBURN, IA 51433-0163
PO BOX 164, AUBURN, IA 51433-0164
PO BOX 165, AUBURN, IA 51433-0165
PO BOX 166, AUBURN, IA 51433-0166
PO BOX 167, AUBURN, IA 51433-0167
PO BOX 168, AUBURN, IA 51433-0168
PO BOX 169, AUBURN, IA 51433-0169
PO BOX 170, AUBURN, IA 51433-0170
PO BOX 171, AUBURN, IA 51433-0171
PO BOX 172, AUBURN, IA 51433-0172
PO BOX 173, AUBURN, IA 51433-0173
PO BOX 174, AUBURN, IA 51433-0174
PO BOX 175, AUBURN, IA 51433-0175
PO BOX 176, AUBURN, IA 51433-0176
PO BOX 177, AUBURN, IA 51433-0177
PO BOX 178, AUBURN, IA 51433-0178
PO BOX 179, AUBURN, IA 51433-0179
PO BOX 180, AUBURN, IA 51433-0180
PO BOX 181, AUBURN, IA 51433-0181
PO BOX 182, AUBURN, IA 51433-0182
PO BOX 183, AUBURN, IA 51433-0183
PO BOX 184, AUBURN, IA 51433-0184
PO BOX 185, AUBURN, IA 51433-0185
PO BOX 186, AUBURN, IA 51433-0186
PO BOX 187, AUBURN, IA 51433-0187
PO BOX 188, AUBURN, IA 51433-0188
PO BOX 189, AUBURN, IA 51433-0189
PO BOX 190, AUBURN, IA 51433-0190
PO BOX 191, AUBURN, IA 51433-0191
PO BOX 192, AUBURN, IA 51433-0192
PO BOX 193, AUBURN, IA 51433-0193
PO BOX 194, AUBURN, IA 51433-0194
PO BOX 195, AUBURN, IA 51433-0195
PO BOX 196, AUBURN, IA 51433-0196
PO BOX 197, AUBURN, IA 51433-0197
PO BOX 198, AUBURN, IA 51433-0198
PO BOX 199, AUBURN, IA 51433-0199
PO BOX 200, AUBURN, IA 51433-0200
PO BOX 201, AUBURN, IA 51433-0201
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