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, PORT WASHINGTON, WI 53074-0001
PO BOX 2, PORT WASHINGTON, WI 53074-0002
PO BOX 3, PORT WASHINGTON, WI 53074-0003
PO BOX 4, PORT WASHINGTON, WI 53074-0004
PO BOX 5, PORT WASHINGTON, WI 53074-0005
PO BOX 6, PORT WASHINGTON, WI 53074-0006
PO BOX 7, PORT WASHINGTON, WI 53074-0007
PO BOX 8, PORT WASHINGTON, WI 53074-0008
PO BOX 9, PORT WASHINGTON, WI 53074-0009
PO BOX 10, PORT WASHINGTON, WI 53074-0010
PO BOX 11, PORT WASHINGTON, WI 53074-0011
PO BOX 12, PORT WASHINGTON, WI 53074-0012
PO BOX 13, PORT WASHINGTON, WI 53074-0013
PO BOX 14, PORT WASHINGTON, WI 53074-0014
PO BOX 15, PORT WASHINGTON, WI 53074-0015
PO BOX 16, PORT WASHINGTON, WI 53074-0016
PO BOX 17, PORT WASHINGTON, WI 53074-0017
PO BOX 18, PORT WASHINGTON, WI 53074-0018
PO BOX 19, PORT WASHINGTON, WI 53074-0019
PO BOX 20, PORT WASHINGTON, WI 53074-0020
PO BOX 21, PORT WASHINGTON, WI 53074-0021
PO BOX 22, PORT WASHINGTON, WI 53074-0022
PO BOX 23, PORT WASHINGTON, WI 53074-0023
PO BOX 24, PORT WASHINGTON, WI 53074-0024
PO BOX 25, PORT WASHINGTON, WI 53074-0025
PO BOX 26, PORT WASHINGTON, WI 53074-0026
PO BOX 27, PORT WASHINGTON, WI 53074-0027
PO BOX 28, PORT WASHINGTON, WI 53074-0028
PO BOX 29, PORT WASHINGTON, WI 53074-0029
PO BOX 30, PORT WASHINGTON, WI 53074-0030
PO BOX 31, PORT WASHINGTON, WI 53074-0031
PO BOX 32, PORT WASHINGTON, WI 53074-0032
PO BOX 33, PORT WASHINGTON, WI 53074-0033
PO BOX 34, PORT WASHINGTON, WI 53074-0034
PO BOX 35, PORT WASHINGTON, WI 53074-0035
PO BOX 36, PORT WASHINGTON, WI 53074-0036
PO BOX 37, PORT WASHINGTON, WI 53074-0037
PO BOX 38, PORT WASHINGTON, WI 53074-0038
PO BOX 39, PORT WASHINGTON, WI 53074-0039
PO BOX 40, PORT WASHINGTON, WI 53074-0040
PO BOX 41, PORT WASHINGTON, WI 53074-0041
PO BOX 42, PORT WASHINGTON, WI 53074-0042
PO BOX 43, PORT WASHINGTON, WI 53074-0043
PO BOX 44, PORT WASHINGTON, WI 53074-0044
PO BOX 45, PORT WASHINGTON, WI 53074-0045
PO BOX 46, PORT WASHINGTON, WI 53074-0046
PO BOX 47, PORT WASHINGTON, WI 53074-0047
PO BOX 48, PORT WASHINGTON, WI 53074-0048
PO BOX 49, PORT WASHINGTON, WI 53074-0049
PO BOX 50, PORT WASHINGTON, WI 53074-0050
PO BOX 51, PORT WASHINGTON, WI 53074-0051
PO BOX 52, PORT WASHINGTON, WI 53074-0052
PO BOX 53, PORT WASHINGTON, WI 53074-0053
PO BOX 54, PORT WASHINGTON, WI 53074-0054
PO BOX 55, PORT WASHINGTON, WI 53074-0055
PO BOX 56, PORT WASHINGTON, WI 53074-0056
PO BOX 57, PORT WASHINGTON, WI 53074-0057
PO BOX 58, PORT WASHINGTON, WI 53074-0058
PO BOX 59, PORT WASHINGTON, WI 53074-0059
PO BOX 60, PORT WASHINGTON, WI 53074-0060
PO BOX 61, PORT WASHINGTON, WI 53074-0061
PO BOX 62, PORT WASHINGTON, WI 53074-0062
PO BOX 63, PORT WASHINGTON, WI 53074-0063
PO BOX 64, PORT WASHINGTON, WI 53074-0064
PO BOX 65, PORT WASHINGTON, WI 53074-0065
PO BOX 66, PORT WASHINGTON, WI 53074-0066
PO BOX 67, PORT WASHINGTON, WI 53074-0067
PO BOX 68, PORT WASHINGTON, WI 53074-0068
PO BOX 69, PORT WASHINGTON, WI 53074-0069
PO BOX 70, PORT WASHINGTON, WI 53074-0070
PO BOX 71, PORT WASHINGTON, WI 53074-0071
PO BOX 72, PORT WASHINGTON, WI 53074-0072
PO BOX 73, PORT WASHINGTON, WI 53074-0073
PO BOX 74, PORT WASHINGTON, WI 53074-0074
PO BOX 75, PORT WASHINGTON, WI 53074-0075
PO BOX 76, PORT WASHINGTON, WI 53074-0076
PO BOX 77, PORT WASHINGTON, WI 53074-0077
PO BOX 78, PORT WASHINGTON, WI 53074-0078
PO BOX 79, PORT WASHINGTON, WI 53074-0079
PO BOX 80, PORT WASHINGTON, WI 53074-0080
PO BOX 81, PORT WASHINGTON, WI 53074-0081
PO BOX 82, PORT WASHINGTON, WI 53074-0082
PO BOX 83, PORT WASHINGTON, WI 53074-0083
PO BOX 84, PORT WASHINGTON, WI 53074-0084
PO BOX 85, PORT WASHINGTON, WI 53074-0085
PO BOX 86, PORT WASHINGTON, WI 53074-0086
PO BOX 87, PORT WASHINGTON, WI 53074-0087
PO BOX 88, PORT WASHINGTON, WI 53074-0088
PO BOX 89, PORT WASHINGTON, WI 53074-0089
PO BOX 90, PORT WASHINGTON, WI 53074-0090
PO BOX 91, PORT WASHINGTON, WI 53074-0091
PO BOX 92, PORT WASHINGTON, WI 53074-0092
PO BOX 93, PORT WASHINGTON, WI 53074-0093
PO BOX 94, PORT WASHINGTON, WI 53074-0094
PO BOX 95, PORT WASHINGTON, WI 53074-0095
PO BOX 96, PORT WASHINGTON, WI 53074-0096
PO BOX 97, PORT WASHINGTON, WI 53074-0097
PO BOX 98, PORT WASHINGTON, WI 53074-0098
PO BOX 99, PORT WASHINGTON, WI 53074-0099
PO BOX 100, PORT WASHINGTON, WI 53074-0100
PO BOX 101, PORT WASHINGTON, WI 53074-0101
PO BOX 102, PORT WASHINGTON, WI 53074-0102
PO BOX 103, PORT WASHINGTON, WI 53074-0103
PO BOX 104, PORT WASHINGTON, WI 53074-0104
PO BOX 105, PORT WASHINGTON, WI 53074-0105
PO BOX 106, PORT WASHINGTON, WI 53074-0106
PO BOX 107, PORT WASHINGTON, WI 53074-0107
PO BOX 108, PORT WASHINGTON, WI 53074-0108
PO BOX 109, PORT WASHINGTON, WI 53074-0109
PO BOX 110, PORT WASHINGTON, WI 53074-0110
PO BOX 111, PORT WASHINGTON, WI 53074-0111
PO BOX 112, PORT WASHINGTON, WI 53074-0112
PO BOX 113, PORT WASHINGTON, WI 53074-0113
PO BOX 114, PORT WASHINGTON, WI 53074-0114
PO BOX 115, PORT WASHINGTON, WI 53074-0115
PO BOX 116, PORT WASHINGTON, WI 53074-0116
PO BOX 117, PORT WASHINGTON, WI 53074-0117
PO BOX 118, PORT WASHINGTON, WI 53074-0118
PO BOX 119, PORT WASHINGTON, WI 53074-0119
PO BOX 120, PORT WASHINGTON, WI 53074-0120
PO BOX 121, PORT WASHINGTON, WI 53074-0121
PO BOX 122, PORT WASHINGTON, WI 53074-0122
PO BOX 123, PORT WASHINGTON, WI 53074-0123
PO BOX 124, PORT WASHINGTON, WI 53074-0124
PO BOX 125, PORT WASHINGTON, WI 53074-0125
PO BOX 126, PORT WASHINGTON, WI 53074-0126
PO BOX 127, PORT WASHINGTON, WI 53074-0127
PO BOX 128, PORT WASHINGTON, WI 53074-0128
PO BOX 129, PORT WASHINGTON, WI 53074-0129
PO BOX 130, PORT WASHINGTON, WI 53074-0130
PO BOX 131, PORT WASHINGTON, WI 53074-0131
PO BOX 132, PORT WASHINGTON, WI 53074-0132
PO BOX 133, PORT WASHINGTON, WI 53074-0133
PO BOX 134, PORT WASHINGTON, WI 53074-0134
PO BOX 135, PORT WASHINGTON, WI 53074-0135
PO BOX 136, PORT WASHINGTON, WI 53074-0136
PO BOX 137, PORT WASHINGTON, WI 53074-0137
PO BOX 138, PORT WASHINGTON, WI 53074-0138
PO BOX 139, PORT WASHINGTON, WI 53074-0139
PO BOX 140, PORT WASHINGTON, WI 53074-0140
PO BOX 141, PORT WASHINGTON, WI 53074-0141
PO BOX 142, PORT WASHINGTON, WI 53074-0142
PO BOX 143, PORT WASHINGTON, WI 53074-0143
PO BOX 144, PORT WASHINGTON, WI 53074-0144
PO BOX 145, PORT WASHINGTON, WI 53074-0145
PO BOX 146, PORT WASHINGTON, WI 53074-0146
PO BOX 147, PORT WASHINGTON, WI 53074-0147
PO BOX 148, PORT WASHINGTON, WI 53074-0148
PO BOX 149, PORT WASHINGTON, WI 53074-0149
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