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, LIBERTYVILLE, IA 52567-0001
PO BOX 2, LIBERTYVILLE, IA 52567-0002
PO BOX 3, LIBERTYVILLE, IA 52567-0003
PO BOX 4, LIBERTYVILLE, IA 52567-0004
PO BOX 5, LIBERTYVILLE, IA 52567-0005
PO BOX 6, LIBERTYVILLE, IA 52567-0006
PO BOX 7, LIBERTYVILLE, IA 52567-0007
PO BOX 8, LIBERTYVILLE, IA 52567-0008
PO BOX 9, LIBERTYVILLE, IA 52567-0009
PO BOX 10, LIBERTYVILLE, IA 52567-0010
PO BOX 11, LIBERTYVILLE, IA 52567-0011
PO BOX 12, LIBERTYVILLE, IA 52567-0012
PO BOX 13, LIBERTYVILLE, IA 52567-0013
PO BOX 14, LIBERTYVILLE, IA 52567-0014
PO BOX 15, LIBERTYVILLE, IA 52567-0015
PO BOX 16, LIBERTYVILLE, IA 52567-0016
PO BOX 17, LIBERTYVILLE, IA 52567-0017
PO BOX 18, LIBERTYVILLE, IA 52567-0018
PO BOX 19, LIBERTYVILLE, IA 52567-0019
PO BOX 20, LIBERTYVILLE, IA 52567-0020
PO BOX 21, LIBERTYVILLE, IA 52567-0021
PO BOX 22, LIBERTYVILLE, IA 52567-0022
PO BOX 23, LIBERTYVILLE, IA 52567-0023
PO BOX 24, LIBERTYVILLE, IA 52567-0024
PO BOX 25, LIBERTYVILLE, IA 52567-0025
PO BOX 26, LIBERTYVILLE, IA 52567-0026
PO BOX 27, LIBERTYVILLE, IA 52567-0027
PO BOX 28, LIBERTYVILLE, IA 52567-0028
PO BOX 29, LIBERTYVILLE, IA 52567-0029
PO BOX 30, LIBERTYVILLE, IA 52567-0030
PO BOX 31, LIBERTYVILLE, IA 52567-0031
PO BOX 32, LIBERTYVILLE, IA 52567-0032
PO BOX 33, LIBERTYVILLE, IA 52567-0033
PO BOX 34, LIBERTYVILLE, IA 52567-0034
PO BOX 35, LIBERTYVILLE, IA 52567-0035
PO BOX 36, LIBERTYVILLE, IA 52567-0036
PO BOX 37, LIBERTYVILLE, IA 52567-0037
PO BOX 38, LIBERTYVILLE, IA 52567-0038
PO BOX 39, LIBERTYVILLE, IA 52567-0039
PO BOX 40, LIBERTYVILLE, IA 52567-0040
PO BOX 41, LIBERTYVILLE, IA 52567-0041
PO BOX 42, LIBERTYVILLE, IA 52567-0042
PO BOX 43, LIBERTYVILLE, IA 52567-0043
PO BOX 44, LIBERTYVILLE, IA 52567-0044
PO BOX 45, LIBERTYVILLE, IA 52567-0045
PO BOX 46, LIBERTYVILLE, IA 52567-0046
PO BOX 47, LIBERTYVILLE, IA 52567-0047
PO BOX 48, LIBERTYVILLE, IA 52567-0048
PO BOX 49, LIBERTYVILLE, IA 52567-0049
PO BOX 50, LIBERTYVILLE, IA 52567-0050
PO BOX 51, LIBERTYVILLE, IA 52567-0051
PO BOX 52, LIBERTYVILLE, IA 52567-0052
PO BOX 53, LIBERTYVILLE, IA 52567-0053
PO BOX 54, LIBERTYVILLE, IA 52567-0054
PO BOX 55, LIBERTYVILLE, IA 52567-0055
PO BOX 56, LIBERTYVILLE, IA 52567-0056
PO BOX 57, LIBERTYVILLE, IA 52567-0057
PO BOX 58, LIBERTYVILLE, IA 52567-0058
PO BOX 59, LIBERTYVILLE, IA 52567-0059
PO BOX 60, LIBERTYVILLE, IA 52567-0060
PO BOX 61, LIBERTYVILLE, IA 52567-0061
PO BOX 62, LIBERTYVILLE, IA 52567-0062
PO BOX 63, LIBERTYVILLE, IA 52567-0063
PO BOX 64, LIBERTYVILLE, IA 52567-0064
PO BOX 65, LIBERTYVILLE, IA 52567-0065
PO BOX 66, LIBERTYVILLE, IA 52567-0066
PO BOX 67, LIBERTYVILLE, IA 52567-0067
PO BOX 68, LIBERTYVILLE, IA 52567-0068
PO BOX 69, LIBERTYVILLE, IA 52567-0069
PO BOX 70, LIBERTYVILLE, IA 52567-0070
PO BOX 71, LIBERTYVILLE, IA 52567-0071
PO BOX 72, LIBERTYVILLE, IA 52567-0072
PO BOX 73, LIBERTYVILLE, IA 52567-0073
PO BOX 74, LIBERTYVILLE, IA 52567-0074
PO BOX 75, LIBERTYVILLE, IA 52567-0075
PO BOX 76, LIBERTYVILLE, IA 52567-0076
PO BOX 77, LIBERTYVILLE, IA 52567-0077
PO BOX 78, LIBERTYVILLE, IA 52567-0078
PO BOX 79, LIBERTYVILLE, IA 52567-0079
PO BOX 80, LIBERTYVILLE, IA 52567-0080
PO BOX 81, LIBERTYVILLE, IA 52567-0081
PO BOX 82, LIBERTYVILLE, IA 52567-0082
PO BOX 83, LIBERTYVILLE, IA 52567-0083
PO BOX 84, LIBERTYVILLE, IA 52567-0084
PO BOX 85, LIBERTYVILLE, IA 52567-0085
PO BOX 86, LIBERTYVILLE, IA 52567-0086
PO BOX 87, LIBERTYVILLE, IA 52567-0087
PO BOX 88, LIBERTYVILLE, IA 52567-0088
PO BOX 89, LIBERTYVILLE, IA 52567-0089
PO BOX 90, LIBERTYVILLE, IA 52567-0090
PO BOX 91, LIBERTYVILLE, IA 52567-0091
PO BOX 92, LIBERTYVILLE, IA 52567-0092
PO BOX 93, LIBERTYVILLE, IA 52567-0093
PO BOX 94, LIBERTYVILLE, IA 52567-0094
PO BOX 95, LIBERTYVILLE, IA 52567-0095
PO BOX 96, LIBERTYVILLE, IA 52567-0096
PO BOX 97, LIBERTYVILLE, IA 52567-0097
PO BOX 98, LIBERTYVILLE, IA 52567-0098
PO BOX 99, LIBERTYVILLE, IA 52567-0099
PO BOX 100, LIBERTYVILLE, IA 52567-0100
PO BOX 101, LIBERTYVILLE, IA 52567-0101
PO BOX 102, LIBERTYVILLE, IA 52567-0102
PO BOX 103, LIBERTYVILLE, IA 52567-0103
PO BOX 104, LIBERTYVILLE, IA 52567-0104
PO BOX 105, LIBERTYVILLE, IA 52567-0105
PO BOX 106, LIBERTYVILLE, IA 52567-0106
PO BOX 107, LIBERTYVILLE, IA 52567-0107
PO BOX 108, LIBERTYVILLE, IA 52567-0108
PO BOX 109, LIBERTYVILLE, IA 52567-0109
PO BOX 110, LIBERTYVILLE, IA 52567-0110
PO BOX 111, LIBERTYVILLE, IA 52567-0111
PO BOX 112, LIBERTYVILLE, IA 52567-0112
PO BOX 113, LIBERTYVILLE, IA 52567-0113
PO BOX 114, LIBERTYVILLE, IA 52567-0114
PO BOX 115, LIBERTYVILLE, IA 52567-0115
PO BOX 116, LIBERTYVILLE, IA 52567-0116
PO BOX 117, LIBERTYVILLE, IA 52567-0117
PO BOX 118, LIBERTYVILLE, IA 52567-0118
PO BOX 119, LIBERTYVILLE, IA 52567-0119
PO BOX 120, LIBERTYVILLE, IA 52567-0120
PO BOX 121, LIBERTYVILLE, IA 52567-0121
PO BOX 122, LIBERTYVILLE, IA 52567-0122
PO BOX 123, LIBERTYVILLE, IA 52567-0123
PO BOX 124, LIBERTYVILLE, IA 52567-0124
PO BOX 125, LIBERTYVILLE, IA 52567-0125
PO BOX 126, LIBERTYVILLE, IA 52567-0126
PO BOX 127, LIBERTYVILLE, IA 52567-0127
PO BOX 128, LIBERTYVILLE, IA 52567-0128
PO BOX 129, LIBERTYVILLE, IA 52567-0129
PO BOX 130, LIBERTYVILLE, IA 52567-0130
PO BOX 131, LIBERTYVILLE, IA 52567-0131
PO BOX 132, LIBERTYVILLE, IA 52567-0132
PO BOX 133, LIBERTYVILLE, IA 52567-0133
PO BOX 134, LIBERTYVILLE, IA 52567-0134
PO BOX 135, LIBERTYVILLE, IA 52567-0135
PO BOX 136, LIBERTYVILLE, IA 52567-0136
PO BOX 137, LIBERTYVILLE, IA 52567-0137
PO BOX 138, LIBERTYVILLE, IA 52567-0138
PO BOX 139, LIBERTYVILLE, IA 52567-0139
PO BOX 140, LIBERTYVILLE, IA 52567-0140
PO BOX 141, LIBERTYVILLE, IA 52567-0141
PO BOX 142, LIBERTYVILLE, IA 52567-0142
PO BOX 143, LIBERTYVILLE, IA 52567-0143
PO BOX 144, LIBERTYVILLE, IA 52567-0144
PO BOX 145, LIBERTYVILLE, IA 52567-0145
PO BOX 146, LIBERTYVILLE, IA 52567-0146
PO BOX 147, LIBERTYVILLE, IA 52567-0147
PO BOX 148, LIBERTYVILLE, IA 52567-0148
PO BOX 149, LIBERTYVILLE, IA 52567-0149
PO BOX 150, LIBERTYVILLE, IA 52567-0150
PO BOX 151, LIBERTYVILLE, IA 52567-0151
PO BOX 152, LIBERTYVILLE, IA 52567-0152
PO BOX 153, LIBERTYVILLE, IA 52567-0153
PO BOX 154, LIBERTYVILLE, IA 52567-0154
PO BOX 155, LIBERTYVILLE, IA 52567-0155
PO BOX 156, LIBERTYVILLE, IA 52567-0156
PO BOX 157, LIBERTYVILLE, IA 52567-0157
PO BOX 158, LIBERTYVILLE, IA 52567-0158
PO BOX 159, LIBERTYVILLE, IA 52567-0159
PO BOX 160, LIBERTYVILLE, IA 52567-0160
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