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, MALLARD, IA 50562-0001
PO BOX 2, MALLARD, IA 50562-0002
PO BOX 3, MALLARD, IA 50562-0003
PO BOX 4, MALLARD, IA 50562-0004
PO BOX 5, MALLARD, IA 50562-0005
PO BOX 6, MALLARD, IA 50562-0006
PO BOX 7, MALLARD, IA 50562-0007
PO BOX 8, MALLARD, IA 50562-0008
PO BOX 9, MALLARD, IA 50562-0009
PO BOX 10, MALLARD, IA 50562-0010
PO BOX 11, MALLARD, IA 50562-0011
PO BOX 12, MALLARD, IA 50562-0012
PO BOX 13, MALLARD, IA 50562-0013
PO BOX 14, MALLARD, IA 50562-0014
PO BOX 15, MALLARD, IA 50562-0015
PO BOX 16, MALLARD, IA 50562-0016
PO BOX 17, MALLARD, IA 50562-0017
PO BOX 18, MALLARD, IA 50562-0018
PO BOX 19, MALLARD, IA 50562-0019
PO BOX 20, MALLARD, IA 50562-0020
PO BOX 21, MALLARD, IA 50562-0021
PO BOX 22, MALLARD, IA 50562-0022
PO BOX 23, MALLARD, IA 50562-0023
PO BOX 24, MALLARD, IA 50562-0024
PO BOX 25, MALLARD, IA 50562-0025
PO BOX 26, MALLARD, IA 50562-0026
PO BOX 27, MALLARD, IA 50562-0027
PO BOX 28, MALLARD, IA 50562-0028
PO BOX 29, MALLARD, IA 50562-0029
PO BOX 30, MALLARD, IA 50562-0030
PO BOX 31, MALLARD, IA 50562-0031
PO BOX 32, MALLARD, IA 50562-0032
PO BOX 33, MALLARD, IA 50562-0033
PO BOX 34, MALLARD, IA 50562-0034
PO BOX 35, MALLARD, IA 50562-0035
PO BOX 36, MALLARD, IA 50562-0036
PO BOX 37, MALLARD, IA 50562-0037
PO BOX 38, MALLARD, IA 50562-0038
PO BOX 39, MALLARD, IA 50562-0039
PO BOX 40, MALLARD, IA 50562-0040
PO BOX 41, MALLARD, IA 50562-0041
PO BOX 42, MALLARD, IA 50562-0042
PO BOX 43, MALLARD, IA 50562-0043
PO BOX 44, MALLARD, IA 50562-0044
PO BOX 45, MALLARD, IA 50562-0045
PO BOX 46, MALLARD, IA 50562-0046
PO BOX 47, MALLARD, IA 50562-0047
PO BOX 48, MALLARD, IA 50562-0048
PO BOX 49, MALLARD, IA 50562-0049
PO BOX 50, MALLARD, IA 50562-0050
PO BOX 51, MALLARD, IA 50562-0051
PO BOX 52, MALLARD, IA 50562-0052
PO BOX 53, MALLARD, IA 50562-0053
PO BOX 54, MALLARD, IA 50562-0054
PO BOX 55, MALLARD, IA 50562-0055
PO BOX 56, MALLARD, IA 50562-0056
PO BOX 57, MALLARD, IA 50562-0057
PO BOX 58, MALLARD, IA 50562-0058
PO BOX 59, MALLARD, IA 50562-0059
PO BOX 60, MALLARD, IA 50562-0060
PO BOX 61, MALLARD, IA 50562-0061
PO BOX 62, MALLARD, IA 50562-0062
PO BOX 63, MALLARD, IA 50562-0063
PO BOX 64, MALLARD, IA 50562-0064
PO BOX 65, MALLARD, IA 50562-0065
PO BOX 66, MALLARD, IA 50562-0066
PO BOX 67, MALLARD, IA 50562-0067
PO BOX 68, MALLARD, IA 50562-0068
PO BOX 69, MALLARD, IA 50562-0069
PO BOX 70, MALLARD, IA 50562-0070
PO BOX 71, MALLARD, IA 50562-0071
PO BOX 72, MALLARD, IA 50562-0072
PO BOX 73, MALLARD, IA 50562-0073
PO BOX 74, MALLARD, IA 50562-0074
PO BOX 75, MALLARD, IA 50562-0075
PO BOX 76, MALLARD, IA 50562-0076
PO BOX 77, MALLARD, IA 50562-0077
PO BOX 78, MALLARD, IA 50562-0078
PO BOX 79, MALLARD, IA 50562-0079
PO BOX 80, MALLARD, IA 50562-0080
PO BOX 81, MALLARD, IA 50562-0081
PO BOX 82, MALLARD, IA 50562-0082
PO BOX 83, MALLARD, IA 50562-0083
PO BOX 84, MALLARD, IA 50562-0084
PO BOX 85, MALLARD, IA 50562-0085
PO BOX 86, MALLARD, IA 50562-0086
PO BOX 87, MALLARD, IA 50562-0087
PO BOX 88, MALLARD, IA 50562-0088
PO BOX 89, MALLARD, IA 50562-0089
PO BOX 90, MALLARD, IA 50562-0090
PO BOX 91, MALLARD, IA 50562-0091
PO BOX 92, MALLARD, IA 50562-0092
PO BOX 93, MALLARD, IA 50562-0093
PO BOX 94, MALLARD, IA 50562-0094
PO BOX 95, MALLARD, IA 50562-0095
PO BOX 96, MALLARD, IA 50562-0096
PO BOX 97, MALLARD, IA 50562-0097
PO BOX 98, MALLARD, IA 50562-0098
PO BOX 99, MALLARD, IA 50562-0099
PO BOX 100, MALLARD, IA 50562-0100
PO BOX 101, MALLARD, IA 50562-0101
PO BOX 102, MALLARD, IA 50562-0102
PO BOX 103, MALLARD, IA 50562-0103
PO BOX 104, MALLARD, IA 50562-0104
PO BOX 105, MALLARD, IA 50562-0105
PO BOX 106, MALLARD, IA 50562-0106
PO BOX 107, MALLARD, IA 50562-0107
PO BOX 108, MALLARD, IA 50562-0108
PO BOX 109, MALLARD, IA 50562-0109
PO BOX 110, MALLARD, IA 50562-0110
PO BOX 111, MALLARD, IA 50562-0111
PO BOX 112, MALLARD, IA 50562-0112
PO BOX 113, MALLARD, IA 50562-0113
PO BOX 114, MALLARD, IA 50562-0114
PO BOX 115, MALLARD, IA 50562-0115
PO BOX 116, MALLARD, IA 50562-0116
PO BOX 117, MALLARD, IA 50562-0117
PO BOX 118, MALLARD, IA 50562-0118
PO BOX 119, MALLARD, IA 50562-0119
PO BOX 120, MALLARD, IA 50562-0120
PO BOX 121, MALLARD, IA 50562-0121
PO BOX 122, MALLARD, IA 50562-0122
PO BOX 123, MALLARD, IA 50562-0123
PO BOX 124, MALLARD, IA 50562-0124
PO BOX 125, MALLARD, IA 50562-0125
PO BOX 126, MALLARD, IA 50562-0126
PO BOX 127, MALLARD, IA 50562-0127
PO BOX 128, MALLARD, IA 50562-0128
PO BOX 129, MALLARD, IA 50562-0129
PO BOX 130, MALLARD, IA 50562-0130
PO BOX 131, MALLARD, IA 50562-0131
PO BOX 132, MALLARD, IA 50562-0132
PO BOX 133, MALLARD, IA 50562-0133
PO BOX 134, MALLARD, IA 50562-0134
PO BOX 135, MALLARD, IA 50562-0135
PO BOX 136, MALLARD, IA 50562-0136
PO BOX 137, MALLARD, IA 50562-0137
PO BOX 138, MALLARD, IA 50562-0138
PO BOX 139, MALLARD, IA 50562-0139
PO BOX 140, MALLARD, IA 50562-0140
PO BOX 141, MALLARD, IA 50562-0141
PO BOX 142, MALLARD, IA 50562-0142
PO BOX 143, MALLARD, IA 50562-0143
PO BOX 144, MALLARD, IA 50562-0144
PO BOX 145, MALLARD, IA 50562-0145
PO BOX 146, MALLARD, IA 50562-0146
PO BOX 147, MALLARD, IA 50562-0147
PO BOX 148, MALLARD, IA 50562-0148
PO BOX 149, MALLARD, IA 50562-0149
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