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, MASON CITY, IA 50402-0001
PO BOX 2, MASON CITY, IA 50402-0002
PO BOX 3, MASON CITY, IA 50402-0003
PO BOX 4, MASON CITY, IA 50402-0004
PO BOX 5, MASON CITY, IA 50402-0005
PO BOX 6, MASON CITY, IA 50402-0006
PO BOX 7, MASON CITY, IA 50402-0007
PO BOX 8, MASON CITY, IA 50402-0008
PO BOX 9, MASON CITY, IA 50402-0009
PO BOX 10, MASON CITY, IA 50402-0010
PO BOX 11, MASON CITY, IA 50402-0011
PO BOX 12, MASON CITY, IA 50402-0012
PO BOX 13, MASON CITY, IA 50402-0013
PO BOX 14, MASON CITY, IA 50402-0014
PO BOX 15, MASON CITY, IA 50402-0015
PO BOX 16, MASON CITY, IA 50402-0016
PO BOX 17, MASON CITY, IA 50402-0017
PO BOX 18, MASON CITY, IA 50402-0018
PO BOX 19, MASON CITY, IA 50402-0019
PO BOX 20, MASON CITY, IA 50402-0020
PO BOX 21, MASON CITY, IA 50402-0021
PO BOX 22, MASON CITY, IA 50402-0022
PO BOX 23, MASON CITY, IA 50402-0023
PO BOX 24, MASON CITY, IA 50402-0024
PO BOX 25, MASON CITY, IA 50402-0025
PO BOX 26, MASON CITY, IA 50402-0026
PO BOX 27, MASON CITY, IA 50402-0027
PO BOX 28, MASON CITY, IA 50402-0028
PO BOX 29, MASON CITY, IA 50402-0029
PO BOX 30, MASON CITY, IA 50402-0030
PO BOX 31, MASON CITY, IA 50402-0031
PO BOX 32, MASON CITY, IA 50402-0032
PO BOX 33, MASON CITY, IA 50402-0033
PO BOX 34, MASON CITY, IA 50402-0034
PO BOX 35, MASON CITY, IA 50402-0035
PO BOX 36, MASON CITY, IA 50402-0036
PO BOX 37, MASON CITY, IA 50402-0037
PO BOX 38, MASON CITY, IA 50402-0038
PO BOX 39, MASON CITY, IA 50402-0039
PO BOX 40, MASON CITY, IA 50402-0040
PO BOX 41, MASON CITY, IA 50402-0041
PO BOX 42, MASON CITY, IA 50402-0042
PO BOX 43, MASON CITY, IA 50402-0043
PO BOX 44, MASON CITY, IA 50402-0044
PO BOX 45, MASON CITY, IA 50402-0045
PO BOX 46, MASON CITY, IA 50402-0046
PO BOX 47, MASON CITY, IA 50402-0047
PO BOX 48, MASON CITY, IA 50402-0048
PO BOX 49, MASON CITY, IA 50402-0049
PO BOX 50, MASON CITY, IA 50402-0050
PO BOX 51, MASON CITY, IA 50402-0051
PO BOX 52, MASON CITY, IA 50402-0052
PO BOX 53, MASON CITY, IA 50402-0053
PO BOX 54, MASON CITY, IA 50402-0054
PO BOX 55, MASON CITY, IA 50402-0055
PO BOX 56, MASON CITY, IA 50402-0056
PO BOX 57, MASON CITY, IA 50402-0057
PO BOX 58, MASON CITY, IA 50402-0058
PO BOX 59, MASON CITY, IA 50402-0059
PO BOX 60, MASON CITY, IA 50402-0060
PO BOX 61, MASON CITY, IA 50402-0061
PO BOX 62, MASON CITY, IA 50402-0062
PO BOX 63, MASON CITY, IA 50402-0063
PO BOX 64, MASON CITY, IA 50402-0064
PO BOX 65, MASON CITY, IA 50402-0065
PO BOX 66, MASON CITY, IA 50402-0066
PO BOX 67, MASON CITY, IA 50402-0067
PO BOX 68, MASON CITY, IA 50402-0068
PO BOX 69, MASON CITY, IA 50402-0069
PO BOX 70, MASON CITY, IA 50402-0070
PO BOX 71, MASON CITY, IA 50402-0071
PO BOX 72, MASON CITY, IA 50402-0072
PO BOX 73, MASON CITY, IA 50402-0073
PO BOX 74, MASON CITY, IA 50402-0074
PO BOX 75, MASON CITY, IA 50402-0075
PO BOX 76, MASON CITY, IA 50402-0076
PO BOX 77, MASON CITY, IA 50402-0077
PO BOX 78, MASON CITY, IA 50402-0078
PO BOX 79, MASON CITY, IA 50402-0079
PO BOX 80, MASON CITY, IA 50402-0080
PO BOX 81, MASON CITY, IA 50402-0081
PO BOX 82, MASON CITY, IA 50402-0082
PO BOX 83, MASON CITY, IA 50402-0083
PO BOX 84, MASON CITY, IA 50402-0084
PO BOX 85, MASON CITY, IA 50402-0085
PO BOX 86, MASON CITY, IA 50402-0086
PO BOX 87, MASON CITY, IA 50402-0087
PO BOX 88, MASON CITY, IA 50402-0088
PO BOX 89, MASON CITY, IA 50402-0089
PO BOX 90, MASON CITY, IA 50402-0090
PO BOX 91, MASON CITY, IA 50402-0091
PO BOX 92, MASON CITY, IA 50402-0092
PO BOX 93, MASON CITY, IA 50402-0093
PO BOX 94, MASON CITY, IA 50402-0094
PO BOX 95, MASON CITY, IA 50402-0095
PO BOX 96, MASON CITY, IA 50402-0096
PO BOX 97, MASON CITY, IA 50402-0097
PO BOX 98, MASON CITY, IA 50402-0098
PO BOX 99, MASON CITY, IA 50402-0099
PO BOX 100, MASON CITY, IA 50402-0100
PO BOX 101, MASON CITY, IA 50402-0101
PO BOX 102, MASON CITY, IA 50402-0102
PO BOX 103, MASON CITY, IA 50402-0103
PO BOX 104, MASON CITY, IA 50402-0104
PO BOX 105, MASON CITY, IA 50402-0105
PO BOX 106, MASON CITY, IA 50402-0106
PO BOX 107, MASON CITY, IA 50402-0107
PO BOX 108, MASON CITY, IA 50402-0108
PO BOX 109, MASON CITY, IA 50402-0109
PO BOX 110, MASON CITY, IA 50402-0110
PO BOX 111, MASON CITY, IA 50402-0111
PO BOX 112, MASON CITY, IA 50402-0112
PO BOX 113, MASON CITY, IA 50402-0113
PO BOX 114, MASON CITY, IA 50402-0114
PO BOX 115, MASON CITY, IA 50402-0115
PO BOX 116, MASON CITY, IA 50402-0116
PO BOX 117, MASON CITY, IA 50402-0117
PO BOX 118, MASON CITY, IA 50402-0118
PO BOX 119, MASON CITY, IA 50402-0119
PO BOX 120, MASON CITY, IA 50402-0120
PO BOX 121, MASON CITY, IA 50402-0121
PO BOX 122, MASON CITY, IA 50402-0122
PO BOX 123, MASON CITY, IA 50402-0123
PO BOX 124, MASON CITY, IA 50402-0124
PO BOX 125, MASON CITY, IA 50402-0125
PO BOX 126, MASON CITY, IA 50402-0126
PO BOX 127, MASON CITY, IA 50402-0127
PO BOX 128, MASON CITY, IA 50402-0128
PO BOX 129, MASON CITY, IA 50402-0129
PO BOX 130, MASON CITY, IA 50402-0130
PO BOX 131, MASON CITY, IA 50402-0131
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