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, SAN FERNANDO, CA 91341-0001
PO BOX 2, SAN FERNANDO, CA 91341-0002
PO BOX 3, SAN FERNANDO, CA 91341-0003
PO BOX 4, SAN FERNANDO, CA 91341-0004
PO BOX 5, SAN FERNANDO, CA 91341-0005
PO BOX 6, SAN FERNANDO, CA 91341-0006
PO BOX 7, SAN FERNANDO, CA 91341-0007
PO BOX 8, SAN FERNANDO, CA 91341-0008
PO BOX 9, SAN FERNANDO, CA 91341-0009
PO BOX 10, SAN FERNANDO, CA 91341-0010
PO BOX 11, SAN FERNANDO, CA 91341-0011
PO BOX 12, SAN FERNANDO, CA 91341-0012
PO BOX 13, SAN FERNANDO, CA 91341-0013
PO BOX 14, SAN FERNANDO, CA 91341-0014
PO BOX 15, SAN FERNANDO, CA 91341-0015
PO BOX 16, SAN FERNANDO, CA 91341-0016
PO BOX 17, SAN FERNANDO, CA 91341-0017
PO BOX 18, SAN FERNANDO, CA 91341-0018
PO BOX 19, SAN FERNANDO, CA 91341-0019
PO BOX 20, SAN FERNANDO, CA 91341-0020
PO BOX 21, SAN FERNANDO, CA 91341-0021
PO BOX 22, SAN FERNANDO, CA 91341-0022
PO BOX 23, SAN FERNANDO, CA 91341-0023
PO BOX 24, SAN FERNANDO, CA 91341-0024
PO BOX 25, SAN FERNANDO, CA 91341-0025
PO BOX 26, SAN FERNANDO, CA 91341-0026
PO BOX 27, SAN FERNANDO, CA 91341-0027
PO BOX 28, SAN FERNANDO, CA 91341-0028
PO BOX 29, SAN FERNANDO, CA 91341-0029
PO BOX 30, SAN FERNANDO, CA 91341-0030
PO BOX 31, SAN FERNANDO, CA 91341-0031
PO BOX 32, SAN FERNANDO, CA 91341-0032
PO BOX 33, SAN FERNANDO, CA 91341-0033
PO BOX 34, SAN FERNANDO, CA 91341-0034
PO BOX 35, SAN FERNANDO, CA 91341-0035
PO BOX 36, SAN FERNANDO, CA 91341-0036
PO BOX 37, SAN FERNANDO, CA 91341-0037
PO BOX 38, SAN FERNANDO, CA 91341-0038
PO BOX 39, SAN FERNANDO, CA 91341-0039
PO BOX 40, SAN FERNANDO, CA 91341-0040
PO BOX 41, SAN FERNANDO, CA 91341-0041
PO BOX 42, SAN FERNANDO, CA 91341-0042
PO BOX 43, SAN FERNANDO, CA 91341-0043
PO BOX 44, SAN FERNANDO, CA 91341-0044
PO BOX 45, SAN FERNANDO, CA 91341-0045
PO BOX 46, SAN FERNANDO, CA 91341-0046
PO BOX 47, SAN FERNANDO, CA 91341-0047
PO BOX 48, SAN FERNANDO, CA 91341-0048
PO BOX 49, SAN FERNANDO, CA 91341-0049
PO BOX 50, SAN FERNANDO, CA 91341-0050
PO BOX 51, SAN FERNANDO, CA 91341-0051
PO BOX 52, SAN FERNANDO, CA 91341-0052
PO BOX 53, SAN FERNANDO, CA 91341-0053
PO BOX 54, SAN FERNANDO, CA 91341-0054
PO BOX 55, SAN FERNANDO, CA 91341-0055
PO BOX 56, SAN FERNANDO, CA 91341-0056
PO BOX 57, SAN FERNANDO, CA 91341-0057
PO BOX 58, SAN FERNANDO, CA 91341-0058
PO BOX 59, SAN FERNANDO, CA 91341-0059
PO BOX 60, SAN FERNANDO, CA 91341-0060
PO BOX 61, SAN FERNANDO, CA 91341-0061
PO BOX 62, SAN FERNANDO, CA 91341-0062
PO BOX 63, SAN FERNANDO, CA 91341-0063
PO BOX 64, SAN FERNANDO, CA 91341-0064
PO BOX 65, SAN FERNANDO, CA 91341-0065
PO BOX 66, SAN FERNANDO, CA 91341-0066
PO BOX 67, SAN FERNANDO, CA 91341-0067
PO BOX 68, SAN FERNANDO, CA 91341-0068
PO BOX 69, SAN FERNANDO, CA 91341-0069
PO BOX 70, SAN FERNANDO, CA 91341-0070
PO BOX 71, SAN FERNANDO, CA 91341-0071
PO BOX 72, SAN FERNANDO, CA 91341-0072
PO BOX 73, SAN FERNANDO, CA 91341-0073
PO BOX 74, SAN FERNANDO, CA 91341-0074
PO BOX 75, SAN FERNANDO, CA 91341-0075
PO BOX 76, SAN FERNANDO, CA 91341-0076
PO BOX 77, SAN FERNANDO, CA 91341-0077
PO BOX 78, SAN FERNANDO, CA 91341-0078
PO BOX 79, SAN FERNANDO, CA 91341-0079
PO BOX 80, SAN FERNANDO, CA 91341-0080
PO BOX 81, SAN FERNANDO, CA 91341-0081
PO BOX 82, SAN FERNANDO, CA 91341-0082
PO BOX 83, SAN FERNANDO, CA 91341-0083
PO BOX 84, SAN FERNANDO, CA 91341-0084
PO BOX 85, SAN FERNANDO, CA 91341-0085
PO BOX 86, SAN FERNANDO, CA 91341-0086
PO BOX 87, SAN FERNANDO, CA 91341-0087
PO BOX 88, SAN FERNANDO, CA 91341-0088
PO BOX 89, SAN FERNANDO, CA 91341-0089
PO BOX 90, SAN FERNANDO, CA 91341-0090
PO BOX 91, SAN FERNANDO, CA 91341-0091
PO BOX 92, SAN FERNANDO, CA 91341-0092
PO BOX 93, SAN FERNANDO, CA 91341-0093
PO BOX 94, SAN FERNANDO, CA 91341-0094
PO BOX 95, SAN FERNANDO, CA 91341-0095
PO BOX 96, SAN FERNANDO, CA 91341-0096
PO BOX 97, SAN FERNANDO, CA 91341-0097
PO BOX 98, SAN FERNANDO, CA 91341-0098
PO BOX 99, SAN FERNANDO, CA 91341-0099
PO BOX 100, SAN FERNANDO, CA 91341-0100
PO BOX 101, SAN FERNANDO, CA 91341-0101
PO BOX 102, SAN FERNANDO, CA 91341-0102
PO BOX 103, SAN FERNANDO, CA 91341-0103
PO BOX 104, SAN FERNANDO, CA 91341-0104
PO BOX 105, SAN FERNANDO, CA 91341-0105
PO BOX 106, SAN FERNANDO, CA 91341-0106
PO BOX 107, SAN FERNANDO, CA 91341-0107
PO BOX 108, SAN FERNANDO, CA 91341-0108
PO BOX 109, SAN FERNANDO, CA 91341-0109
PO BOX 110, SAN FERNANDO, CA 91341-0110
PO BOX 111, SAN FERNANDO, CA 91341-0111
PO BOX 112, SAN FERNANDO, CA 91341-0112
PO BOX 113, SAN FERNANDO, CA 91341-0113
PO BOX 114, SAN FERNANDO, CA 91341-0114
PO BOX 115, SAN FERNANDO, CA 91341-0115
PO BOX 116, SAN FERNANDO, CA 91341-0116
PO BOX 117, SAN FERNANDO, CA 91341-0117
PO BOX 118, SAN FERNANDO, CA 91341-0118
PO BOX 119, SAN FERNANDO, CA 91341-0119
PO BOX 120, SAN FERNANDO, CA 91341-0120
PO BOX 121, SAN FERNANDO, CA 91341-0121
PO BOX 122, SAN FERNANDO, CA 91341-0122
PO BOX 123, SAN FERNANDO, CA 91341-0123
PO BOX 124, SAN FERNANDO, CA 91341-0124
PO BOX 125, SAN FERNANDO, CA 91341-0125
PO BOX 126, SAN FERNANDO, CA 91341-0126
PO BOX 127, SAN FERNANDO, CA 91341-0127
PO BOX 128, SAN FERNANDO, CA 91341-0128
PO BOX 129, SAN FERNANDO, CA 91341-0129
PO BOX 130, SAN FERNANDO, CA 91341-0130
PO BOX 131, SAN FERNANDO, CA 91341-0131
PO BOX 132, SAN FERNANDO, CA 91341-0132
PO BOX 133, SAN FERNANDO, CA 91341-0133
PO BOX 134, SAN FERNANDO, CA 91341-0134
PO BOX 135, SAN FERNANDO, CA 91341-0135
PO BOX 136, SAN FERNANDO, CA 91341-0136
PO BOX 137, SAN FERNANDO, CA 91341-0137
PO BOX 138, SAN FERNANDO, CA 91341-0138
PO BOX 139, SAN FERNANDO, CA 91341-0139
PO BOX 140, SAN FERNANDO, CA 91341-0140
PO BOX 141, SAN FERNANDO, CA 91341-0141
PO BOX 142, SAN FERNANDO, CA 91341-0142
PO BOX 143, SAN FERNANDO, CA 91341-0143
PO BOX 144, SAN FERNANDO, CA 91341-0144
PO BOX 145, SAN FERNANDO, CA 91341-0145
PO BOX 146, SAN FERNANDO, CA 91341-0146
PO BOX 147, SAN FERNANDO, CA 91341-0147
PO BOX 148, SAN FERNANDO, CA 91341-0148
PO BOX 149, SAN FERNANDO, CA 91341-0149
PO BOX 150, SAN FERNANDO, CA 91341-0150
PO BOX 151, SAN FERNANDO, CA 91341-0151
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