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, MICHIGAN CITY, IN 46361-0001
PO BOX 2, MICHIGAN CITY, IN 46361-0002
PO BOX 3, MICHIGAN CITY, IN 46361-0003
PO BOX 4, MICHIGAN CITY, IN 46361-0004
PO BOX 5, MICHIGAN CITY, IN 46361-0005
PO BOX 6, MICHIGAN CITY, IN 46361-0006
PO BOX 7, MICHIGAN CITY, IN 46361-0007
PO BOX 8, MICHIGAN CITY, IN 46361-0008
PO BOX 9, MICHIGAN CITY, IN 46361-0009
PO BOX 10, MICHIGAN CITY, IN 46361-0010
PO BOX 11, MICHIGAN CITY, IN 46361-0011
PO BOX 12, MICHIGAN CITY, IN 46361-0012
PO BOX 13, MICHIGAN CITY, IN 46361-0013
PO BOX 14, MICHIGAN CITY, IN 46361-0014
PO BOX 15, MICHIGAN CITY, IN 46361-0015
PO BOX 16, MICHIGAN CITY, IN 46361-0016
PO BOX 17, MICHIGAN CITY, IN 46361-0017
PO BOX 18, MICHIGAN CITY, IN 46361-0018
PO BOX 19, MICHIGAN CITY, IN 46361-0019
PO BOX 20, MICHIGAN CITY, IN 46361-0020
PO BOX 21, MICHIGAN CITY, IN 46361-0021
PO BOX 22, MICHIGAN CITY, IN 46361-0022
PO BOX 23, MICHIGAN CITY, IN 46361-0023
PO BOX 24, MICHIGAN CITY, IN 46361-0024
PO BOX 25, MICHIGAN CITY, IN 46361-0025
PO BOX 26, MICHIGAN CITY, IN 46361-0026
PO BOX 27, MICHIGAN CITY, IN 46361-0027
PO BOX 28, MICHIGAN CITY, IN 46361-0028
PO BOX 29, MICHIGAN CITY, IN 46361-0029
PO BOX 30, MICHIGAN CITY, IN 46361-0030
PO BOX 31, MICHIGAN CITY, IN 46361-0031
PO BOX 32, MICHIGAN CITY, IN 46361-0032
PO BOX 33, MICHIGAN CITY, IN 46361-0033
PO BOX 34, MICHIGAN CITY, IN 46361-0034
PO BOX 35, MICHIGAN CITY, IN 46361-0035
PO BOX 36, MICHIGAN CITY, IN 46361-0036
PO BOX 37, MICHIGAN CITY, IN 46361-0037
PO BOX 38, MICHIGAN CITY, IN 46361-0038
PO BOX 39, MICHIGAN CITY, IN 46361-0039
PO BOX 40, MICHIGAN CITY, IN 46361-0040
PO BOX 41, MICHIGAN CITY, IN 46361-0041
PO BOX 42, MICHIGAN CITY, IN 46361-0042
PO BOX 43, MICHIGAN CITY, IN 46361-0043
PO BOX 44, MICHIGAN CITY, IN 46361-0044
PO BOX 45, MICHIGAN CITY, IN 46361-0045
PO BOX 46, MICHIGAN CITY, IN 46361-0046
PO BOX 47, MICHIGAN CITY, IN 46361-0047
PO BOX 48, MICHIGAN CITY, IN 46361-0048
PO BOX 49, MICHIGAN CITY, IN 46361-0049
PO BOX 50, MICHIGAN CITY, IN 46361-0050
PO BOX 51, MICHIGAN CITY, IN 46361-0051
PO BOX 52, MICHIGAN CITY, IN 46361-0052
PO BOX 53, MICHIGAN CITY, IN 46361-0053
PO BOX 54, MICHIGAN CITY, IN 46361-0054
PO BOX 55, MICHIGAN CITY, IN 46361-0055
PO BOX 56, MICHIGAN CITY, IN 46361-0056
PO BOX 57, MICHIGAN CITY, IN 46361-0057
PO BOX 58, MICHIGAN CITY, IN 46361-0058
PO BOX 59, MICHIGAN CITY, IN 46361-0059
PO BOX 60, MICHIGAN CITY, IN 46361-0060
PO BOX 61, MICHIGAN CITY, IN 46361-0061
PO BOX 62, MICHIGAN CITY, IN 46361-0062
PO BOX 63, MICHIGAN CITY, IN 46361-0063
PO BOX 64, MICHIGAN CITY, IN 46361-0064
PO BOX 65, MICHIGAN CITY, IN 46361-0065
PO BOX 66, MICHIGAN CITY, IN 46361-0066
PO BOX 67, MICHIGAN CITY, IN 46361-0067
PO BOX 68, MICHIGAN CITY, IN 46361-0068
PO BOX 69, MICHIGAN CITY, IN 46361-0069
PO BOX 70, MICHIGAN CITY, IN 46361-0070
PO BOX 71, MICHIGAN CITY, IN 46361-0071
PO BOX 72, MICHIGAN CITY, IN 46361-0072
PO BOX 73, MICHIGAN CITY, IN 46361-0073
PO BOX 74, MICHIGAN CITY, IN 46361-0074
PO BOX 75, MICHIGAN CITY, IN 46361-0075
PO BOX 76, MICHIGAN CITY, IN 46361-0076
PO BOX 77, MICHIGAN CITY, IN 46361-0077
PO BOX 78, MICHIGAN CITY, IN 46361-0078
PO BOX 79, MICHIGAN CITY, IN 46361-0079
PO BOX 80, MICHIGAN CITY, IN 46361-0080
PO BOX 81, MICHIGAN CITY, IN 46361-0081
PO BOX 82, MICHIGAN CITY, IN 46361-0082
PO BOX 83, MICHIGAN CITY, IN 46361-0083
PO BOX 84, MICHIGAN CITY, IN 46361-0084
PO BOX 85, MICHIGAN CITY, IN 46361-0085
PO BOX 86, MICHIGAN CITY, IN 46361-0086
PO BOX 87, MICHIGAN CITY, IN 46361-0087
PO BOX 88, MICHIGAN CITY, IN 46361-0088
PO BOX 89, MICHIGAN CITY, IN 46361-0089
PO BOX 90, MICHIGAN CITY, IN 46361-0090
PO BOX 91, MICHIGAN CITY, IN 46361-0091
PO BOX 92, MICHIGAN CITY, IN 46361-0092
PO BOX 93, MICHIGAN CITY, IN 46361-0093
PO BOX 94, MICHIGAN CITY, IN 46361-0094
PO BOX 95, MICHIGAN CITY, IN 46361-0095
PO BOX 96, MICHIGAN CITY, IN 46361-0096
PO BOX 97, MICHIGAN CITY, IN 46361-0097
PO BOX 98, MICHIGAN CITY, IN 46361-0098
PO BOX 99, MICHIGAN CITY, IN 46361-0099
PO BOX 100, MICHIGAN CITY, IN 46361-0100
PO BOX 101, MICHIGAN CITY, IN 46361-0101
PO BOX 102, MICHIGAN CITY, IN 46361-0102
PO BOX 103, MICHIGAN CITY, IN 46361-0103
PO BOX 104, MICHIGAN CITY, IN 46361-0104
PO BOX 105, MICHIGAN CITY, IN 46361-0105
PO BOX 106, MICHIGAN CITY, IN 46361-0106
PO BOX 107, MICHIGAN CITY, IN 46361-0107
PO BOX 108, MICHIGAN CITY, IN 46361-0108
PO BOX 109, MICHIGAN CITY, IN 46361-0109
PO BOX 110, MICHIGAN CITY, IN 46361-0110
PO BOX 111, MICHIGAN CITY, IN 46361-0111
PO BOX 112, MICHIGAN CITY, IN 46361-0112
PO BOX 113, MICHIGAN CITY, IN 46361-0113
PO BOX 114, MICHIGAN CITY, IN 46361-0114
PO BOX 115, MICHIGAN CITY, IN 46361-0115
PO BOX 116, MICHIGAN CITY, IN 46361-0116
PO BOX 117, MICHIGAN CITY, IN 46361-0117
PO BOX 118, MICHIGAN CITY, IN 46361-0118
PO BOX 119, MICHIGAN CITY, IN 46361-0119
PO BOX 120, MICHIGAN CITY, IN 46361-0120
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