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, ALLERTON, IA 50008-0001
PO BOX 2, ALLERTON, IA 50008-0002
PO BOX 3, ALLERTON, IA 50008-0003
PO BOX 4, ALLERTON, IA 50008-0004
PO BOX 5, ALLERTON, IA 50008-0005
PO BOX 6, ALLERTON, IA 50008-0006
PO BOX 7, ALLERTON, IA 50008-0007
PO BOX 8, ALLERTON, IA 50008-0008
PO BOX 9, ALLERTON, IA 50008-0009
PO BOX 10, ALLERTON, IA 50008-0010
PO BOX 11, ALLERTON, IA 50008-0011
PO BOX 12, ALLERTON, IA 50008-0012
PO BOX 13, ALLERTON, IA 50008-0013
PO BOX 14, ALLERTON, IA 50008-0014
PO BOX 15, ALLERTON, IA 50008-0015
PO BOX 16, ALLERTON, IA 50008-0016
PO BOX 17, ALLERTON, IA 50008-0017
PO BOX 18, ALLERTON, IA 50008-0018
PO BOX 19, ALLERTON, IA 50008-0019
PO BOX 20, ALLERTON, IA 50008-0020
PO BOX 21, ALLERTON, IA 50008-0021
PO BOX 22, ALLERTON, IA 50008-0022
PO BOX 23, ALLERTON, IA 50008-0023
PO BOX 24, ALLERTON, IA 50008-0024
PO BOX 25, ALLERTON, IA 50008-0025
PO BOX 26, ALLERTON, IA 50008-0026
PO BOX 27, ALLERTON, IA 50008-0027
PO BOX 28, ALLERTON, IA 50008-0028
PO BOX 29, ALLERTON, IA 50008-0029
PO BOX 30, ALLERTON, IA 50008-0030
PO BOX 31, ALLERTON, IA 50008-0031
PO BOX 32, ALLERTON, IA 50008-0032
PO BOX 33, ALLERTON, IA 50008-0033
PO BOX 34, ALLERTON, IA 50008-0034
PO BOX 35, ALLERTON, IA 50008-0035
PO BOX 36, ALLERTON, IA 50008-0036
PO BOX 37, ALLERTON, IA 50008-0037
PO BOX 38, ALLERTON, IA 50008-0038
PO BOX 39, ALLERTON, IA 50008-0039
PO BOX 40, ALLERTON, IA 50008-0040
PO BOX 41, ALLERTON, IA 50008-0041
PO BOX 42, ALLERTON, IA 50008-0042
PO BOX 43, ALLERTON, IA 50008-0043
PO BOX 44, ALLERTON, IA 50008-0044
PO BOX 45, ALLERTON, IA 50008-0045
PO BOX 46, ALLERTON, IA 50008-0046
PO BOX 47, ALLERTON, IA 50008-0047
PO BOX 48, ALLERTON, IA 50008-0048
PO BOX 49, ALLERTON, IA 50008-0049
PO BOX 50, ALLERTON, IA 50008-0050
PO BOX 51, ALLERTON, IA 50008-0051
PO BOX 52, ALLERTON, IA 50008-0052
PO BOX 53, ALLERTON, IA 50008-0053
PO BOX 54, ALLERTON, IA 50008-0054
PO BOX 55, ALLERTON, IA 50008-0055
PO BOX 56, ALLERTON, IA 50008-0056
PO BOX 57, ALLERTON, IA 50008-0057
PO BOX 58, ALLERTON, IA 50008-0058
PO BOX 59, ALLERTON, IA 50008-0059
PO BOX 60, ALLERTON, IA 50008-0060
PO BOX 61, ALLERTON, IA 50008-0061
PO BOX 62, ALLERTON, IA 50008-0062
PO BOX 63, ALLERTON, IA 50008-0063
PO BOX 64, ALLERTON, IA 50008-0064
PO BOX 65, ALLERTON, IA 50008-0065
PO BOX 66, ALLERTON, IA 50008-0066
PO BOX 67, ALLERTON, IA 50008-0067
PO BOX 68, ALLERTON, IA 50008-0068
PO BOX 69, ALLERTON, IA 50008-0069
PO BOX 70, ALLERTON, IA 50008-0070
PO BOX 71, ALLERTON, IA 50008-0071
PO BOX 72, ALLERTON, IA 50008-0072
PO BOX 73, ALLERTON, IA 50008-0073
PO BOX 74, ALLERTON, IA 50008-0074
PO BOX 75, ALLERTON, IA 50008-0075
PO BOX 76, ALLERTON, IA 50008-0076
PO BOX 77, ALLERTON, IA 50008-0077
PO BOX 78, ALLERTON, IA 50008-0078
PO BOX 79, ALLERTON, IA 50008-0079
PO BOX 80, ALLERTON, IA 50008-0080
PO BOX 81, ALLERTON, IA 50008-0081
PO BOX 82, ALLERTON, IA 50008-0082
PO BOX 83, ALLERTON, IA 50008-0083
PO BOX 84, ALLERTON, IA 50008-0084
PO BOX 85, ALLERTON, IA 50008-0085
PO BOX 86, ALLERTON, IA 50008-0086
PO BOX 87, ALLERTON, IA 50008-0087
PO BOX 88, ALLERTON, IA 50008-0088
PO BOX 89, ALLERTON, IA 50008-0089
PO BOX 90, ALLERTON, IA 50008-0090
PO BOX 91, ALLERTON, IA 50008-0091
PO BOX 92, ALLERTON, IA 50008-0092
PO BOX 93, ALLERTON, IA 50008-0093
PO BOX 94, ALLERTON, IA 50008-0094
PO BOX 95, ALLERTON, IA 50008-0095
PO BOX 96, ALLERTON, IA 50008-0096
PO BOX 97, ALLERTON, IA 50008-0097
PO BOX 98, ALLERTON, IA 50008-0098
PO BOX 99, ALLERTON, IA 50008-0099
PO BOX 100, ALLERTON, IA 50008-0100
PO BOX 101, ALLERTON, IA 50008-0101
PO BOX 102, ALLERTON, IA 50008-0102
PO BOX 103, ALLERTON, IA 50008-0103
PO BOX 104, ALLERTON, IA 50008-0104
PO BOX 105, ALLERTON, IA 50008-0105
PO BOX 106, ALLERTON, IA 50008-0106
PO BOX 107, ALLERTON, IA 50008-0107
PO BOX 108, ALLERTON, IA 50008-0108
PO BOX 109, ALLERTON, IA 50008-0109
PO BOX 110, ALLERTON, IA 50008-0110
PO BOX 111, ALLERTON, IA 50008-0111
PO BOX 112, ALLERTON, IA 50008-0112
PO BOX 113, ALLERTON, IA 50008-0113
PO BOX 114, ALLERTON, IA 50008-0114
PO BOX 115, ALLERTON, IA 50008-0115
PO BOX 116, ALLERTON, IA 50008-0116
PO BOX 117, ALLERTON, IA 50008-0117
PO BOX 118, ALLERTON, IA 50008-0118
PO BOX 119, ALLERTON, IA 50008-0119
PO BOX 120, ALLERTON, IA 50008-0120
PO BOX 121, ALLERTON, IA 50008-0121
PO BOX 122, ALLERTON, IA 50008-0122
PO BOX 123, ALLERTON, IA 50008-0123
PO BOX 124, ALLERTON, IA 50008-0124
PO BOX 125, ALLERTON, IA 50008-0125
PO BOX 126, ALLERTON, IA 50008-0126
PO BOX 127, ALLERTON, IA 50008-0127
PO BOX 128, ALLERTON, IA 50008-0128
PO BOX 129, ALLERTON, IA 50008-0129
PO BOX 130, ALLERTON, IA 50008-0130
PO BOX 131, ALLERTON, IA 50008-0131
PO BOX 132, ALLERTON, IA 50008-0132
PO BOX 133, ALLERTON, IA 50008-0133
PO BOX 134, ALLERTON, IA 50008-0134
PO BOX 135, ALLERTON, IA 50008-0135
PO BOX 136, ALLERTON, IA 50008-0136
PO BOX 137, ALLERTON, IA 50008-0137
PO BOX 138, ALLERTON, IA 50008-0138
PO BOX 139, ALLERTON, IA 50008-0139
PO BOX 140, ALLERTON, IA 50008-0140
PO BOX 141, ALLERTON, IA 50008-0141
PO BOX 142, ALLERTON, IA 50008-0142
PO BOX 143, ALLERTON, IA 50008-0143
PO BOX 144, ALLERTON, IA 50008-0144
PO BOX 145, ALLERTON, IA 50008-0145
PO BOX 146, ALLERTON, IA 50008-0146
PO BOX 147, ALLERTON, IA 50008-0147
PO BOX 148, ALLERTON, IA 50008-0148
PO BOX 149, ALLERTON, IA 50008-0149
PO BOX 150, ALLERTON, IA 50008-0150
PO BOX 151, ALLERTON, IA 50008-0151
PO BOX 152, ALLERTON, IA 50008-0152
PO BOX 153, ALLERTON, IA 50008-0153
PO BOX 154, ALLERTON, IA 50008-0154
PO BOX 155, ALLERTON, IA 50008-0155
PO BOX 156, ALLERTON, IA 50008-0156
PO BOX 157, ALLERTON, IA 50008-0157
PO BOX 158, ALLERTON, IA 50008-0158
PO BOX 159, ALLERTON, IA 50008-0159
PO BOX 160, ALLERTON, IA 50008-0160
PO BOX 161, ALLERTON, IA 50008-0161
PO BOX 162, ALLERTON, IA 50008-0162
PO BOX 163, ALLERTON, IA 50008-0163
PO BOX 164, ALLERTON, IA 50008-0164
PO BOX 165, ALLERTON, IA 50008-0165
PO BOX 166, ALLERTON, IA 50008-0166
PO BOX 167, ALLERTON, IA 50008-0167
PO BOX 168, ALLERTON, IA 50008-0168
PO BOX 169, ALLERTON, IA 50008-0169
PO BOX 170, ALLERTON, IA 50008-0170
PO BOX 171, ALLERTON, IA 50008-0171
PO BOX 172, ALLERTON, IA 50008-0172
PO BOX 173, ALLERTON, IA 50008-0173
PO BOX 174, ALLERTON, IA 50008-0174
PO BOX 175, ALLERTON, IA 50008-0175
PO BOX 176, ALLERTON, IA 50008-0176
PO BOX 177, ALLERTON, IA 50008-0177
PO BOX 178, ALLERTON, IA 50008-0178
PO BOX 179, ALLERTON, IA 50008-0179
PO BOX 180, ALLERTON, IA 50008-0180
PO BOX 181, ALLERTON, IA 50008-0181
PO BOX 182, ALLERTON, IA 50008-0182
PO BOX 183, ALLERTON, IA 50008-0183
PO BOX 184, ALLERTON, IA 50008-0184
PO BOX 185, ALLERTON, IA 50008-0185
PO BOX 186, ALLERTON, IA 50008-0186
PO BOX 187, ALLERTON, IA 50008-0187
PO BOX 188, ALLERTON, IA 50008-0188
PO BOX 189, ALLERTON, IA 50008-0189
PO BOX 190, ALLERTON, IA 50008-0190
PO BOX 191, ALLERTON, IA 50008-0191
PO BOX 192, ALLERTON, IA 50008-0192
PO BOX 193, ALLERTON, IA 50008-0193
PO BOX 194, ALLERTON, IA 50008-0194
PO BOX 195, ALLERTON, IA 50008-0195
PO BOX 196, ALLERTON, IA 50008-0196
PO BOX 197, ALLERTON, IA 50008-0197
PO BOX 198, ALLERTON, IA 50008-0198
PO BOX 199, ALLERTON, IA 50008-0199
PO BOX 200, ALLERTON, IA 50008-0200
PO BOX 201, ALLERTON, IA 50008-0201
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