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, PRESTON, IA 52069-0001
PO BOX 2, PRESTON, IA 52069-0002
PO BOX 3, PRESTON, IA 52069-0003
PO BOX 4, PRESTON, IA 52069-0004
PO BOX 5, PRESTON, IA 52069-0005
PO BOX 6, PRESTON, IA 52069-0006
PO BOX 7, PRESTON, IA 52069-0007
PO BOX 8, PRESTON, IA 52069-0008
PO BOX 9, PRESTON, IA 52069-0009
PO BOX 10, PRESTON, IA 52069-0010
PO BOX 11, PRESTON, IA 52069-0011
PO BOX 12, PRESTON, IA 52069-0012
PO BOX 13, PRESTON, IA 52069-0013
PO BOX 14, PRESTON, IA 52069-0014
PO BOX 15, PRESTON, IA 52069-0015
PO BOX 16, PRESTON, IA 52069-0016
PO BOX 17, PRESTON, IA 52069-0017
PO BOX 18, PRESTON, IA 52069-0018
PO BOX 19, PRESTON, IA 52069-0019
PO BOX 20, PRESTON, IA 52069-0020
PO BOX 21, PRESTON, IA 52069-0021
PO BOX 22, PRESTON, IA 52069-0022
PO BOX 23, PRESTON, IA 52069-0023
PO BOX 24, PRESTON, IA 52069-0024
PO BOX 25, PRESTON, IA 52069-0025
PO BOX 26, PRESTON, IA 52069-0026
PO BOX 27, PRESTON, IA 52069-0027
PO BOX 28, PRESTON, IA 52069-0028
PO BOX 29, PRESTON, IA 52069-0029
PO BOX 30, PRESTON, IA 52069-0030
PO BOX 31, PRESTON, IA 52069-0031
PO BOX 32, PRESTON, IA 52069-0032
PO BOX 33, PRESTON, IA 52069-0033
PO BOX 34, PRESTON, IA 52069-0034
PO BOX 35, PRESTON, IA 52069-0035
PO BOX 36, PRESTON, IA 52069-0036
PO BOX 37, PRESTON, IA 52069-0037
PO BOX 38, PRESTON, IA 52069-0038
PO BOX 39, PRESTON, IA 52069-0039
PO BOX 40, PRESTON, IA 52069-0040
PO BOX 41, PRESTON, IA 52069-0041
PO BOX 42, PRESTON, IA 52069-0042
PO BOX 43, PRESTON, IA 52069-0043
PO BOX 44, PRESTON, IA 52069-0044
PO BOX 45, PRESTON, IA 52069-0045
PO BOX 46, PRESTON, IA 52069-0046
PO BOX 47, PRESTON, IA 52069-0047
PO BOX 48, PRESTON, IA 52069-0048
PO BOX 49, PRESTON, IA 52069-0049
PO BOX 50, PRESTON, IA 52069-0050
PO BOX 51, PRESTON, IA 52069-0051
PO BOX 52, PRESTON, IA 52069-0052
PO BOX 53, PRESTON, IA 52069-0053
PO BOX 54, PRESTON, IA 52069-0054
PO BOX 55, PRESTON, IA 52069-0055
PO BOX 56, PRESTON, IA 52069-0056
PO BOX 57, PRESTON, IA 52069-0057
PO BOX 58, PRESTON, IA 52069-0058
PO BOX 59, PRESTON, IA 52069-0059
PO BOX 60, PRESTON, IA 52069-0060
PO BOX 61, PRESTON, IA 52069-0061
PO BOX 62, PRESTON, IA 52069-0062
PO BOX 63, PRESTON, IA 52069-0063
PO BOX 64, PRESTON, IA 52069-0064
PO BOX 65, PRESTON, IA 52069-0065
PO BOX 66, PRESTON, IA 52069-0066
PO BOX 67, PRESTON, IA 52069-0067
PO BOX 68, PRESTON, IA 52069-0068
PO BOX 69, PRESTON, IA 52069-0069
PO BOX 70, PRESTON, IA 52069-0070
PO BOX 71, PRESTON, IA 52069-0071
PO BOX 72, PRESTON, IA 52069-0072
PO BOX 73, PRESTON, IA 52069-0073
PO BOX 74, PRESTON, IA 52069-0074
PO BOX 75, PRESTON, IA 52069-0075
PO BOX 76, PRESTON, IA 52069-0076
PO BOX 77, PRESTON, IA 52069-0077
PO BOX 78, PRESTON, IA 52069-0078
PO BOX 79, PRESTON, IA 52069-0079
PO BOX 80, PRESTON, IA 52069-0080
PO BOX 81, PRESTON, IA 52069-0081
PO BOX 82, PRESTON, IA 52069-0082
PO BOX 83, PRESTON, IA 52069-0083
PO BOX 84, PRESTON, IA 52069-0084
PO BOX 85, PRESTON, IA 52069-0085
PO BOX 86, PRESTON, IA 52069-0086
PO BOX 87, PRESTON, IA 52069-0087
PO BOX 88, PRESTON, IA 52069-0088
PO BOX 89, PRESTON, IA 52069-0089
PO BOX 90, PRESTON, IA 52069-0090
PO BOX 91, PRESTON, IA 52069-0091
PO BOX 92, PRESTON, IA 52069-0092
PO BOX 93, PRESTON, IA 52069-0093
PO BOX 94, PRESTON, IA 52069-0094
PO BOX 95, PRESTON, IA 52069-0095
PO BOX 96, PRESTON, IA 52069-0096
PO BOX 97, PRESTON, IA 52069-0097
PO BOX 98, PRESTON, IA 52069-0098
PO BOX 99, PRESTON, IA 52069-0099
PO BOX 100, PRESTON, IA 52069-0100
PO BOX 101, PRESTON, IA 52069-0101
PO BOX 102, PRESTON, IA 52069-0102
PO BOX 103, PRESTON, IA 52069-0103
PO BOX 104, PRESTON, IA 52069-0104
PO BOX 105, PRESTON, IA 52069-0105
PO BOX 106, PRESTON, IA 52069-0106
PO BOX 107, PRESTON, IA 52069-0107
PO BOX 108, PRESTON, IA 52069-0108
PO BOX 109, PRESTON, IA 52069-0109
PO BOX 110, PRESTON, IA 52069-0110
PO BOX 111, PRESTON, IA 52069-0111
PO BOX 112, PRESTON, IA 52069-0112
PO BOX 113, PRESTON, IA 52069-0113
PO BOX 114, PRESTON, IA 52069-0114
PO BOX 115, PRESTON, IA 52069-0115
PO BOX 116, PRESTON, IA 52069-0116
PO BOX 117, PRESTON, IA 52069-0117
PO BOX 118, PRESTON, IA 52069-0118
PO BOX 119, PRESTON, IA 52069-0119
PO BOX 120, PRESTON, IA 52069-0120
PO BOX 121, PRESTON, IA 52069-0121
PO BOX 122, PRESTON, IA 52069-0122
PO BOX 123, PRESTON, IA 52069-0123
PO BOX 124, PRESTON, IA 52069-0124
PO BOX 125, PRESTON, IA 52069-0125
PO BOX 126, PRESTON, IA 52069-0126
PO BOX 127, PRESTON, IA 52069-0127
PO BOX 128, PRESTON, IA 52069-0128
PO BOX 129, PRESTON, IA 52069-0129
PO BOX 130, PRESTON, IA 52069-0130
PO BOX 131, PRESTON, IA 52069-0131
PO BOX 132, PRESTON, IA 52069-0132
PO BOX 133, PRESTON, IA 52069-0133
PO BOX 134, PRESTON, IA 52069-0134
PO BOX 135, PRESTON, IA 52069-0135
PO BOX 136, PRESTON, IA 52069-0136
PO BOX 137, PRESTON, IA 52069-0137
PO BOX 138, PRESTON, IA 52069-0138
PO BOX 139, PRESTON, IA 52069-0139
PO BOX 140, PRESTON, IA 52069-0140
PO BOX 141, PRESTON, IA 52069-0141
PO BOX 142, PRESTON, IA 52069-0142
PO BOX 143, PRESTON, IA 52069-0143
PO BOX 144, PRESTON, IA 52069-0144
PO BOX 145, PRESTON, IA 52069-0145
PO BOX 146, PRESTON, IA 52069-0146
PO BOX 147, PRESTON, IA 52069-0147
PO BOX 148, PRESTON, IA 52069-0148
PO BOX 149, PRESTON, IA 52069-0149
PO BOX 150, PRESTON, IA 52069-0150
PO BOX 151, PRESTON, IA 52069-0151
PO BOX 152, PRESTON, IA 52069-0152
PO BOX 153, PRESTON, IA 52069-0153
PO BOX 154, PRESTON, IA 52069-0154
PO BOX 155, PRESTON, IA 52069-0155
PO BOX 156, PRESTON, IA 52069-0156
PO BOX 157, PRESTON, IA 52069-0157
PO BOX 158, PRESTON, IA 52069-0158
PO BOX 159, PRESTON, IA 52069-0159
PO BOX 160, PRESTON, IA 52069-0160
PO BOX 161, PRESTON, IA 52069-0161
PO BOX 162, PRESTON, IA 52069-0162
PO BOX 163, PRESTON, IA 52069-0163
PO BOX 164, PRESTON, IA 52069-0164
PO BOX 165, PRESTON, IA 52069-0165
PO BOX 166, PRESTON, IA 52069-0166
PO BOX 167, PRESTON, IA 52069-0167
PO BOX 168, PRESTON, IA 52069-0168
PO BOX 169, PRESTON, IA 52069-0169
PO BOX 170, PRESTON, IA 52069-0170
PO BOX 171, PRESTON, IA 52069-0171
PO BOX 172, PRESTON, IA 52069-0172
PO BOX 173, PRESTON, IA 52069-0173
PO BOX 174, PRESTON, IA 52069-0174
PO BOX 175, PRESTON, IA 52069-0175
PO BOX 176, PRESTON, IA 52069-0176
PO BOX 177, PRESTON, IA 52069-0177
PO BOX 178, PRESTON, IA 52069-0178
PO BOX 179, PRESTON, IA 52069-0179
PO BOX 180, PRESTON, IA 52069-0180
PO BOX 181, PRESTON, IA 52069-0181
PO BOX 182, PRESTON, IA 52069-0182
PO BOX 183, PRESTON, IA 52069-0183
PO BOX 184, PRESTON, IA 52069-0184
PO BOX 185, PRESTON, IA 52069-0185
PO BOX 186, PRESTON, IA 52069-0186
PO BOX 187, PRESTON, IA 52069-0187
PO BOX 188, PRESTON, IA 52069-0188
PO BOX 189, PRESTON, IA 52069-0189
PO BOX 190, PRESTON, IA 52069-0190
PO BOX 191, PRESTON, IA 52069-0191
PO BOX 192, PRESTON, IA 52069-0192
PO BOX 193, PRESTON, IA 52069-0193
PO BOX 194, PRESTON, IA 52069-0194
PO BOX 195, PRESTON, IA 52069-0195
PO BOX 196, PRESTON, IA 52069-0196
PO BOX 197, PRESTON, IA 52069-0197
PO BOX 198, PRESTON, IA 52069-0198
PO BOX 199, PRESTON, IA 52069-0199
PO BOX 200, PRESTON, IA 52069-0200
PO BOX 201, PRESTON, IA 52069-0201
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