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, MOORHEAD, IA 51558-0001
PO BOX 2, MOORHEAD, IA 51558-0002
PO BOX 3, MOORHEAD, IA 51558-0003
PO BOX 4, MOORHEAD, IA 51558-0004
PO BOX 5, MOORHEAD, IA 51558-0005
PO BOX 6, MOORHEAD, IA 51558-0006
PO BOX 7, MOORHEAD, IA 51558-0007
PO BOX 8, MOORHEAD, IA 51558-0008
PO BOX 9, MOORHEAD, IA 51558-0009
PO BOX 10, MOORHEAD, IA 51558-0010
PO BOX 11, MOORHEAD, IA 51558-0011
PO BOX 12, MOORHEAD, IA 51558-0012
PO BOX 13, MOORHEAD, IA 51558-0013
PO BOX 14, MOORHEAD, IA 51558-0014
PO BOX 15, MOORHEAD, IA 51558-0015
PO BOX 16, MOORHEAD, IA 51558-0016
PO BOX 17, MOORHEAD, IA 51558-0017
PO BOX 18, MOORHEAD, IA 51558-0018
PO BOX 19, MOORHEAD, IA 51558-0019
PO BOX 20, MOORHEAD, IA 51558-0020
PO BOX 21, MOORHEAD, IA 51558-0021
PO BOX 22, MOORHEAD, IA 51558-0022
PO BOX 23, MOORHEAD, IA 51558-0023
PO BOX 24, MOORHEAD, IA 51558-0024
PO BOX 25, MOORHEAD, IA 51558-0025
PO BOX 26, MOORHEAD, IA 51558-0026
PO BOX 27, MOORHEAD, IA 51558-0027
PO BOX 28, MOORHEAD, IA 51558-0028
PO BOX 29, MOORHEAD, IA 51558-0029
PO BOX 30, MOORHEAD, IA 51558-0030
PO BOX 31, MOORHEAD, IA 51558-0031
PO BOX 32, MOORHEAD, IA 51558-0032
PO BOX 33, MOORHEAD, IA 51558-0033
PO BOX 34, MOORHEAD, IA 51558-0034
PO BOX 35, MOORHEAD, IA 51558-0035
PO BOX 36, MOORHEAD, IA 51558-0036
PO BOX 37, MOORHEAD, IA 51558-0037
PO BOX 38, MOORHEAD, IA 51558-0038
PO BOX 39, MOORHEAD, IA 51558-0039
PO BOX 40, MOORHEAD, IA 51558-0040
PO BOX 41, MOORHEAD, IA 51558-0041
PO BOX 42, MOORHEAD, IA 51558-0042
PO BOX 43, MOORHEAD, IA 51558-0043
PO BOX 44, MOORHEAD, IA 51558-0044
PO BOX 45, MOORHEAD, IA 51558-0045
PO BOX 46, MOORHEAD, IA 51558-0046
PO BOX 47, MOORHEAD, IA 51558-0047
PO BOX 48, MOORHEAD, IA 51558-0048
PO BOX 49, MOORHEAD, IA 51558-0049
PO BOX 50, MOORHEAD, IA 51558-0050
PO BOX 51, MOORHEAD, IA 51558-0051
PO BOX 52, MOORHEAD, IA 51558-0052
PO BOX 53, MOORHEAD, IA 51558-0053
PO BOX 54, MOORHEAD, IA 51558-0054
PO BOX 55, MOORHEAD, IA 51558-0055
PO BOX 56, MOORHEAD, IA 51558-0056
PO BOX 57, MOORHEAD, IA 51558-0057
PO BOX 58, MOORHEAD, IA 51558-0058
PO BOX 59, MOORHEAD, IA 51558-0059
PO BOX 60, MOORHEAD, IA 51558-0060
PO BOX 61, MOORHEAD, IA 51558-0061
PO BOX 62, MOORHEAD, IA 51558-0062
PO BOX 63, MOORHEAD, IA 51558-0063
PO BOX 64, MOORHEAD, IA 51558-0064
PO BOX 65, MOORHEAD, IA 51558-0065
PO BOX 66, MOORHEAD, IA 51558-0066
PO BOX 67, MOORHEAD, IA 51558-0067
PO BOX 68, MOORHEAD, IA 51558-0068
PO BOX 69, MOORHEAD, IA 51558-0069
PO BOX 70, MOORHEAD, IA 51558-0070
PO BOX 71, MOORHEAD, IA 51558-0071
PO BOX 72, MOORHEAD, IA 51558-0072
PO BOX 73, MOORHEAD, IA 51558-0073
PO BOX 74, MOORHEAD, IA 51558-0074
PO BOX 75, MOORHEAD, IA 51558-0075
PO BOX 76, MOORHEAD, IA 51558-0076
PO BOX 77, MOORHEAD, IA 51558-0077
PO BOX 78, MOORHEAD, IA 51558-0078
PO BOX 79, MOORHEAD, IA 51558-0079
PO BOX 80, MOORHEAD, IA 51558-0080
PO BOX 81, MOORHEAD, IA 51558-0081
PO BOX 82, MOORHEAD, IA 51558-0082
PO BOX 83, MOORHEAD, IA 51558-0083
PO BOX 84, MOORHEAD, IA 51558-0084
PO BOX 85, MOORHEAD, IA 51558-0085
PO BOX 86, MOORHEAD, IA 51558-0086
PO BOX 87, MOORHEAD, IA 51558-0087
PO BOX 88, MOORHEAD, IA 51558-0088
PO BOX 89, MOORHEAD, IA 51558-0089
PO BOX 90, MOORHEAD, IA 51558-0090
PO BOX 91, MOORHEAD, IA 51558-0091
PO BOX 92, MOORHEAD, IA 51558-0092
PO BOX 93, MOORHEAD, IA 51558-0093
PO BOX 94, MOORHEAD, IA 51558-0094
PO BOX 95, MOORHEAD, IA 51558-0095
PO BOX 96, MOORHEAD, IA 51558-0096
PO BOX 97, MOORHEAD, IA 51558-0097
PO BOX 98, MOORHEAD, IA 51558-0098
PO BOX 99, MOORHEAD, IA 51558-0099
PO BOX 100, MOORHEAD, IA 51558-0100
PO BOX 101, MOORHEAD, IA 51558-0101
PO BOX 102, MOORHEAD, IA 51558-0102
PO BOX 103, MOORHEAD, IA 51558-0103
PO BOX 104, MOORHEAD, IA 51558-0104
PO BOX 105, MOORHEAD, IA 51558-0105
PO BOX 106, MOORHEAD, IA 51558-0106
PO BOX 107, MOORHEAD, IA 51558-0107
PO BOX 108, MOORHEAD, IA 51558-0108
PO BOX 109, MOORHEAD, IA 51558-0109
PO BOX 110, MOORHEAD, IA 51558-0110
PO BOX 111, MOORHEAD, IA 51558-0111
PO BOX 112, MOORHEAD, IA 51558-0112
PO BOX 113, MOORHEAD, IA 51558-0113
PO BOX 114, MOORHEAD, IA 51558-0114
PO BOX 115, MOORHEAD, IA 51558-0115
PO BOX 116, MOORHEAD, IA 51558-0116
PO BOX 117, MOORHEAD, IA 51558-0117
PO BOX 118, MOORHEAD, IA 51558-0118
PO BOX 119, MOORHEAD, IA 51558-0119
PO BOX 120, MOORHEAD, IA 51558-0120
PO BOX 121, MOORHEAD, IA 51558-0121
PO BOX 122, MOORHEAD, IA 51558-0122
PO BOX 123, MOORHEAD, IA 51558-0123
PO BOX 124, MOORHEAD, IA 51558-0124
PO BOX 125, MOORHEAD, IA 51558-0125
PO BOX 126, MOORHEAD, IA 51558-0126
PO BOX 127, MOORHEAD, IA 51558-0127
PO BOX 128, MOORHEAD, IA 51558-0128
PO BOX 129, MOORHEAD, IA 51558-0129
PO BOX 130, MOORHEAD, IA 51558-0130
PO BOX 131, MOORHEAD, IA 51558-0131
PO BOX 132, MOORHEAD, IA 51558-0132
PO BOX 133, MOORHEAD, IA 51558-0133
PO BOX 134, MOORHEAD, IA 51558-0134
PO BOX 135, MOORHEAD, IA 51558-0135
PO BOX 136, MOORHEAD, IA 51558-0136
PO BOX 137, MOORHEAD, IA 51558-0137
PO BOX 138, MOORHEAD, IA 51558-0138
PO BOX 139, MOORHEAD, IA 51558-0139
PO BOX 140, MOORHEAD, IA 51558-0140
PO BOX 141, MOORHEAD, IA 51558-0141
PO BOX 142, MOORHEAD, IA 51558-0142
PO BOX 143, MOORHEAD, IA 51558-0143
PO BOX 144, MOORHEAD, IA 51558-0144
PO BOX 145, MOORHEAD, IA 51558-0145
PO BOX 146, MOORHEAD, IA 51558-0146
PO BOX 147, MOORHEAD, IA 51558-0147
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