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, SOUTH SAN FRANCISCO, CA 94083-0001
PO BOX 2, SOUTH SAN FRANCISCO, CA 94083-0002
PO BOX 3, SOUTH SAN FRANCISCO, CA 94083-0003
PO BOX 4, SOUTH SAN FRANCISCO, CA 94083-0004
PO BOX 5, SOUTH SAN FRANCISCO, CA 94083-0005
PO BOX 6, SOUTH SAN FRANCISCO, CA 94083-0006
PO BOX 7, SOUTH SAN FRANCISCO, CA 94083-0007
PO BOX 8, SOUTH SAN FRANCISCO, CA 94083-0008
PO BOX 9, SOUTH SAN FRANCISCO, CA 94083-0009
PO BOX 10, SOUTH SAN FRANCISCO, CA 94083-0010
PO BOX 11, SOUTH SAN FRANCISCO, CA 94083-0011
PO BOX 12, SOUTH SAN FRANCISCO, CA 94083-0012
PO BOX 13, SOUTH SAN FRANCISCO, CA 94083-0013
PO BOX 14, SOUTH SAN FRANCISCO, CA 94083-0014
PO BOX 15, SOUTH SAN FRANCISCO, CA 94083-0015
PO BOX 16, SOUTH SAN FRANCISCO, CA 94083-0016
PO BOX 17, SOUTH SAN FRANCISCO, CA 94083-0017
PO BOX 18, SOUTH SAN FRANCISCO, CA 94083-0018
PO BOX 19, SOUTH SAN FRANCISCO, CA 94083-0019
PO BOX 20, SOUTH SAN FRANCISCO, CA 94083-0020
PO BOX 21, SOUTH SAN FRANCISCO, CA 94083-0021
PO BOX 22, SOUTH SAN FRANCISCO, CA 94083-0022
PO BOX 23, SOUTH SAN FRANCISCO, CA 94083-0023
PO BOX 24, SOUTH SAN FRANCISCO, CA 94083-0024
PO BOX 25, SOUTH SAN FRANCISCO, CA 94083-0025
PO BOX 26, SOUTH SAN FRANCISCO, CA 94083-0026
PO BOX 27, SOUTH SAN FRANCISCO, CA 94083-0027
PO BOX 28, SOUTH SAN FRANCISCO, CA 94083-0028
PO BOX 29, SOUTH SAN FRANCISCO, CA 94083-0029
PO BOX 30, SOUTH SAN FRANCISCO, CA 94083-0030
PO BOX 31, SOUTH SAN FRANCISCO, CA 94083-0031
PO BOX 32, SOUTH SAN FRANCISCO, CA 94083-0032
PO BOX 33, SOUTH SAN FRANCISCO, CA 94083-0033
PO BOX 34, SOUTH SAN FRANCISCO, CA 94083-0034
PO BOX 35, SOUTH SAN FRANCISCO, CA 94083-0035
PO BOX 36, SOUTH SAN FRANCISCO, CA 94083-0036
PO BOX 37, SOUTH SAN FRANCISCO, CA 94083-0037
PO BOX 38, SOUTH SAN FRANCISCO, CA 94083-0038
PO BOX 39, SOUTH SAN FRANCISCO, CA 94083-0039
PO BOX 40, SOUTH SAN FRANCISCO, CA 94083-0040
PO BOX 41, SOUTH SAN FRANCISCO, CA 94083-0041
PO BOX 42, SOUTH SAN FRANCISCO, CA 94083-0042
PO BOX 43, SOUTH SAN FRANCISCO, CA 94083-0043
PO BOX 44, SOUTH SAN FRANCISCO, CA 94083-0044
PO BOX 45, SOUTH SAN FRANCISCO, CA 94083-0045
PO BOX 46, SOUTH SAN FRANCISCO, CA 94083-0046
PO BOX 47, SOUTH SAN FRANCISCO, CA 94083-0047
PO BOX 48, SOUTH SAN FRANCISCO, CA 94083-0048
PO BOX 49, SOUTH SAN FRANCISCO, CA 94083-0049
PO BOX 50, SOUTH SAN FRANCISCO, CA 94083-0050
PO BOX 51, SOUTH SAN FRANCISCO, CA 94083-0051
PO BOX 52, SOUTH SAN FRANCISCO, CA 94083-0052
PO BOX 53, SOUTH SAN FRANCISCO, CA 94083-0053
PO BOX 54, SOUTH SAN FRANCISCO, CA 94083-0054
PO BOX 55, SOUTH SAN FRANCISCO, CA 94083-0055
PO BOX 56, SOUTH SAN FRANCISCO, CA 94083-0056
PO BOX 57, SOUTH SAN FRANCISCO, CA 94083-0057
PO BOX 58, SOUTH SAN FRANCISCO, CA 94083-0058
PO BOX 59, SOUTH SAN FRANCISCO, CA 94083-0059
PO BOX 60, SOUTH SAN FRANCISCO, CA 94083-0060
PO BOX 61, SOUTH SAN FRANCISCO, CA 94083-0061
PO BOX 62, SOUTH SAN FRANCISCO, CA 94083-0062
PO BOX 63, SOUTH SAN FRANCISCO, CA 94083-0063
PO BOX 64, SOUTH SAN FRANCISCO, CA 94083-0064
PO BOX 65, SOUTH SAN FRANCISCO, CA 94083-0065
PO BOX 66, SOUTH SAN FRANCISCO, CA 94083-0066
PO BOX 67, SOUTH SAN FRANCISCO, CA 94083-0067
PO BOX 68, SOUTH SAN FRANCISCO, CA 94083-0068
PO BOX 69, SOUTH SAN FRANCISCO, CA 94083-0069
PO BOX 70, SOUTH SAN FRANCISCO, CA 94083-0070
PO BOX 71, SOUTH SAN FRANCISCO, CA 94083-0071
PO BOX 72, SOUTH SAN FRANCISCO, CA 94083-0072
PO BOX 73, SOUTH SAN FRANCISCO, CA 94083-0073
PO BOX 74, SOUTH SAN FRANCISCO, CA 94083-0074
PO BOX 75, SOUTH SAN FRANCISCO, CA 94083-0075
PO BOX 76, SOUTH SAN FRANCISCO, CA 94083-0076
PO BOX 77, SOUTH SAN FRANCISCO, CA 94083-0077
PO BOX 78, SOUTH SAN FRANCISCO, CA 94083-0078
PO BOX 79, SOUTH SAN FRANCISCO, CA 94083-0079
PO BOX 80, SOUTH SAN FRANCISCO, CA 94083-0080
PO BOX 81, SOUTH SAN FRANCISCO, CA 94083-0081
PO BOX 82, SOUTH SAN FRANCISCO, CA 94083-0082
PO BOX 83, SOUTH SAN FRANCISCO, CA 94083-0083
PO BOX 84, SOUTH SAN FRANCISCO, CA 94083-0084
PO BOX 85, SOUTH SAN FRANCISCO, CA 94083-0085
PO BOX 86, SOUTH SAN FRANCISCO, CA 94083-0086
PO BOX 87, SOUTH SAN FRANCISCO, CA 94083-0087
PO BOX 88, SOUTH SAN FRANCISCO, CA 94083-0088
PO BOX 89, SOUTH SAN FRANCISCO, CA 94083-0089
PO BOX 90, SOUTH SAN FRANCISCO, CA 94083-0090
PO BOX 91, SOUTH SAN FRANCISCO, CA 94083-0091
PO BOX 92, SOUTH SAN FRANCISCO, CA 94083-0092
PO BOX 93, SOUTH SAN FRANCISCO, CA 94083-0093
PO BOX 94, SOUTH SAN FRANCISCO, CA 94083-0094
PO BOX 95, SOUTH SAN FRANCISCO, CA 94083-0095
PO BOX 96, SOUTH SAN FRANCISCO, CA 94083-0096
PO BOX 97, SOUTH SAN FRANCISCO, CA 94083-0097
PO BOX 98, SOUTH SAN FRANCISCO, CA 94083-0098
PO BOX 99, SOUTH SAN FRANCISCO, CA 94083-0099
PO BOX 100, SOUTH SAN FRANCISCO, CA 94083-0100
PO BOX 101, SOUTH SAN FRANCISCO, CA 94083-0101
PO BOX 102, SOUTH SAN FRANCISCO, CA 94083-0102
PO BOX 103, SOUTH SAN FRANCISCO, CA 94083-0103
PO BOX 104, SOUTH SAN FRANCISCO, CA 94083-0104
PO BOX 105, SOUTH SAN FRANCISCO, CA 94083-0105
PO BOX 106, SOUTH SAN FRANCISCO, CA 94083-0106
PO BOX 107, SOUTH SAN FRANCISCO, CA 94083-0107
PO BOX 108, SOUTH SAN FRANCISCO, CA 94083-0108
PO BOX 109, SOUTH SAN FRANCISCO, CA 94083-0109
PO BOX 110, SOUTH SAN FRANCISCO, CA 94083-0110
PO BOX 111, SOUTH SAN FRANCISCO, CA 94083-0111
PO BOX 112, SOUTH SAN FRANCISCO, CA 94083-0112
PO BOX 113, SOUTH SAN FRANCISCO, CA 94083-0113
PO BOX 114, SOUTH SAN FRANCISCO, CA 94083-0114
PO BOX 115, SOUTH SAN FRANCISCO, CA 94083-0115
PO BOX 116, SOUTH SAN FRANCISCO, CA 94083-0116
PO BOX 117, SOUTH SAN FRANCISCO, CA 94083-0117
PO BOX 118, SOUTH SAN FRANCISCO, CA 94083-0118
PO BOX 119, SOUTH SAN FRANCISCO, CA 94083-0119
PO BOX 120, SOUTH SAN FRANCISCO, CA 94083-0120
PO BOX 121, SOUTH SAN FRANCISCO, CA 94083-0121
PO BOX 122, SOUTH SAN FRANCISCO, CA 94083-0122
PO BOX 123, SOUTH SAN FRANCISCO, CA 94083-0123
PO BOX 124, SOUTH SAN FRANCISCO, CA 94083-0124
PO BOX 125, SOUTH SAN FRANCISCO, CA 94083-0125
PO BOX 126, SOUTH SAN FRANCISCO, CA 94083-0126
PO BOX 127, SOUTH SAN FRANCISCO, CA 94083-0127
PO BOX 128, SOUTH SAN FRANCISCO, CA 94083-0128
PO BOX 129, SOUTH SAN FRANCISCO, CA 94083-0129
PO BOX 130, SOUTH SAN FRANCISCO, CA 94083-0130
PO BOX 131, SOUTH SAN FRANCISCO, CA 94083-0131
PO BOX 132, SOUTH SAN FRANCISCO, CA 94083-0132
PO BOX 133, SOUTH SAN FRANCISCO, CA 94083-0133
PO BOX 134, SOUTH SAN FRANCISCO, CA 94083-0134
PO BOX 135, SOUTH SAN FRANCISCO, CA 94083-0135
PO BOX 136, SOUTH SAN FRANCISCO, CA 94083-0136
PO BOX 137, SOUTH SAN FRANCISCO, CA 94083-0137
PO BOX 138, SOUTH SAN FRANCISCO, CA 94083-0138
PO BOX 139, SOUTH SAN FRANCISCO, CA 94083-0139
PO BOX 140, SOUTH SAN FRANCISCO, CA 94083-0140
PO BOX 141, SOUTH SAN FRANCISCO, CA 94083-0141
PO BOX 142, SOUTH SAN FRANCISCO, CA 94083-0142
PO BOX 143, SOUTH SAN FRANCISCO, CA 94083-0143
PO BOX 144, SOUTH SAN FRANCISCO, CA 94083-0144
PO BOX 145, SOUTH SAN FRANCISCO, CA 94083-0145
PO BOX 146, SOUTH SAN FRANCISCO, CA 94083-0146
PO BOX 147, SOUTH SAN FRANCISCO, CA 94083-0147
PO BOX 148, SOUTH SAN FRANCISCO, CA 94083-0148
PO BOX 149, SOUTH SAN FRANCISCO, CA 94083-0149
PO BOX 150, SOUTH SAN FRANCISCO, CA 94083-0150
PO BOX 151, SOUTH SAN FRANCISCO, CA 94083-0151
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