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, KNIGHTS LANDING, CA 95645-0001
PO BOX 2, KNIGHTS LANDING, CA 95645-0002
PO BOX 3, KNIGHTS LANDING, CA 95645-0003
PO BOX 4, KNIGHTS LANDING, CA 95645-0004
PO BOX 5, KNIGHTS LANDING, CA 95645-0005
PO BOX 6, KNIGHTS LANDING, CA 95645-0006
PO BOX 7, KNIGHTS LANDING, CA 95645-0007
PO BOX 8, KNIGHTS LANDING, CA 95645-0008
PO BOX 9, KNIGHTS LANDING, CA 95645-0009
PO BOX 10, KNIGHTS LANDING, CA 95645-0010
PO BOX 11, KNIGHTS LANDING, CA 95645-0011
PO BOX 12, KNIGHTS LANDING, CA 95645-0012
PO BOX 13, KNIGHTS LANDING, CA 95645-0013
PO BOX 14, KNIGHTS LANDING, CA 95645-0014
PO BOX 15, KNIGHTS LANDING, CA 95645-0015
PO BOX 16, KNIGHTS LANDING, CA 95645-0016
PO BOX 17, KNIGHTS LANDING, CA 95645-0017
PO BOX 18, KNIGHTS LANDING, CA 95645-0018
PO BOX 19, KNIGHTS LANDING, CA 95645-0019
PO BOX 20, KNIGHTS LANDING, CA 95645-0020
PO BOX 21, KNIGHTS LANDING, CA 95645-0021
PO BOX 22, KNIGHTS LANDING, CA 95645-0022
PO BOX 23, KNIGHTS LANDING, CA 95645-0023
PO BOX 24, KNIGHTS LANDING, CA 95645-0024
PO BOX 25, KNIGHTS LANDING, CA 95645-0025
PO BOX 26, KNIGHTS LANDING, CA 95645-0026
PO BOX 27, KNIGHTS LANDING, CA 95645-0027
PO BOX 28, KNIGHTS LANDING, CA 95645-0028
PO BOX 29, KNIGHTS LANDING, CA 95645-0029
PO BOX 30, KNIGHTS LANDING, CA 95645-0030
PO BOX 31, KNIGHTS LANDING, CA 95645-0031
PO BOX 32, KNIGHTS LANDING, CA 95645-0032
PO BOX 33, KNIGHTS LANDING, CA 95645-0033
PO BOX 34, KNIGHTS LANDING, CA 95645-0034
PO BOX 35, KNIGHTS LANDING, CA 95645-0035
PO BOX 36, KNIGHTS LANDING, CA 95645-0036
PO BOX 37, KNIGHTS LANDING, CA 95645-0037
PO BOX 38, KNIGHTS LANDING, CA 95645-0038
PO BOX 39, KNIGHTS LANDING, CA 95645-0039
PO BOX 40, KNIGHTS LANDING, CA 95645-0040
PO BOX 41, KNIGHTS LANDING, CA 95645-0041
PO BOX 42, KNIGHTS LANDING, CA 95645-0042
PO BOX 43, KNIGHTS LANDING, CA 95645-0043
PO BOX 44, KNIGHTS LANDING, CA 95645-0044
PO BOX 45, KNIGHTS LANDING, CA 95645-0045
PO BOX 46, KNIGHTS LANDING, CA 95645-0046
PO BOX 47, KNIGHTS LANDING, CA 95645-0047
PO BOX 48, KNIGHTS LANDING, CA 95645-0048
PO BOX 49, KNIGHTS LANDING, CA 95645-0049
PO BOX 50, KNIGHTS LANDING, CA 95645-0050
PO BOX 51, KNIGHTS LANDING, CA 95645-0051
PO BOX 52, KNIGHTS LANDING, CA 95645-0052
PO BOX 53, KNIGHTS LANDING, CA 95645-0053
PO BOX 54, KNIGHTS LANDING, CA 95645-0054
PO BOX 55, KNIGHTS LANDING, CA 95645-0055
PO BOX 56, KNIGHTS LANDING, CA 95645-0056
PO BOX 57, KNIGHTS LANDING, CA 95645-0057
PO BOX 58, KNIGHTS LANDING, CA 95645-0058
PO BOX 59, KNIGHTS LANDING, CA 95645-0059
PO BOX 60, KNIGHTS LANDING, CA 95645-0060
PO BOX 61, KNIGHTS LANDING, CA 95645-0061
PO BOX 62, KNIGHTS LANDING, CA 95645-0062
PO BOX 63, KNIGHTS LANDING, CA 95645-0063
PO BOX 64, KNIGHTS LANDING, CA 95645-0064
PO BOX 65, KNIGHTS LANDING, CA 95645-0065
PO BOX 66, KNIGHTS LANDING, CA 95645-0066
PO BOX 67, KNIGHTS LANDING, CA 95645-0067
PO BOX 68, KNIGHTS LANDING, CA 95645-0068
PO BOX 69, KNIGHTS LANDING, CA 95645-0069
PO BOX 70, KNIGHTS LANDING, CA 95645-0070
PO BOX 71, KNIGHTS LANDING, CA 95645-0071
PO BOX 72, KNIGHTS LANDING, CA 95645-0072
PO BOX 73, KNIGHTS LANDING, CA 95645-0073
PO BOX 74, KNIGHTS LANDING, CA 95645-0074
PO BOX 75, KNIGHTS LANDING, CA 95645-0075
PO BOX 76, KNIGHTS LANDING, CA 95645-0076
PO BOX 77, KNIGHTS LANDING, CA 95645-0077
PO BOX 78, KNIGHTS LANDING, CA 95645-0078
PO BOX 79, KNIGHTS LANDING, CA 95645-0079
PO BOX 80, KNIGHTS LANDING, CA 95645-0080
PO BOX 81, KNIGHTS LANDING, CA 95645-0081
PO BOX 82, KNIGHTS LANDING, CA 95645-0082
PO BOX 83, KNIGHTS LANDING, CA 95645-0083
PO BOX 84, KNIGHTS LANDING, CA 95645-0084
PO BOX 85, KNIGHTS LANDING, CA 95645-0085
PO BOX 86, KNIGHTS LANDING, CA 95645-0086
PO BOX 87, KNIGHTS LANDING, CA 95645-0087
PO BOX 88, KNIGHTS LANDING, CA 95645-0088
PO BOX 89, KNIGHTS LANDING, CA 95645-0089
PO BOX 90, KNIGHTS LANDING, CA 95645-0090
PO BOX 91, KNIGHTS LANDING, CA 95645-0091
PO BOX 92, KNIGHTS LANDING, CA 95645-0092
PO BOX 93, KNIGHTS LANDING, CA 95645-0093
PO BOX 94, KNIGHTS LANDING, CA 95645-0094
PO BOX 95, KNIGHTS LANDING, CA 95645-0095
PO BOX 96, KNIGHTS LANDING, CA 95645-0096
PO BOX 97, KNIGHTS LANDING, CA 95645-0097
PO BOX 98, KNIGHTS LANDING, CA 95645-0098
PO BOX 99, KNIGHTS LANDING, CA 95645-0099
PO BOX 100, KNIGHTS LANDING, CA 95645-0100
PO BOX 101, KNIGHTS LANDING, CA 95645-0101
PO BOX 102, KNIGHTS LANDING, CA 95645-0102
PO BOX 103, KNIGHTS LANDING, CA 95645-0103
PO BOX 104, KNIGHTS LANDING, CA 95645-0104
PO BOX 105, KNIGHTS LANDING, CA 95645-0105
PO BOX 106, KNIGHTS LANDING, CA 95645-0106
PO BOX 107, KNIGHTS LANDING, CA 95645-0107
PO BOX 108, KNIGHTS LANDING, CA 95645-0108
PO BOX 109, KNIGHTS LANDING, CA 95645-0109
PO BOX 110, KNIGHTS LANDING, CA 95645-0110
PO BOX 111, KNIGHTS LANDING, CA 95645-0111
PO BOX 112, KNIGHTS LANDING, CA 95645-0112
PO BOX 113, KNIGHTS LANDING, CA 95645-0113
PO BOX 114, KNIGHTS LANDING, CA 95645-0114
PO BOX 115, KNIGHTS LANDING, CA 95645-0115
PO BOX 116, KNIGHTS LANDING, CA 95645-0116
PO BOX 117, KNIGHTS LANDING, CA 95645-0117
PO BOX 118, KNIGHTS LANDING, CA 95645-0118
PO BOX 119, KNIGHTS LANDING, CA 95645-0119
PO BOX 120, KNIGHTS LANDING, CA 95645-0120
PO BOX 121, KNIGHTS LANDING, CA 95645-0121
PO BOX 122, KNIGHTS LANDING, CA 95645-0122
PO BOX 123, KNIGHTS LANDING, CA 95645-0123
PO BOX 124, KNIGHTS LANDING, CA 95645-0124
PO BOX 125, KNIGHTS LANDING, CA 95645-0125
PO BOX 126, KNIGHTS LANDING, CA 95645-0126
PO BOX 127, KNIGHTS LANDING, CA 95645-0127
PO BOX 128, KNIGHTS LANDING, CA 95645-0128
PO BOX 129, KNIGHTS LANDING, CA 95645-0129
PO BOX 130, KNIGHTS LANDING, CA 95645-0130
PO BOX 131, KNIGHTS LANDING, CA 95645-0131
PO BOX 132, KNIGHTS LANDING, CA 95645-0132
PO BOX 133, KNIGHTS LANDING, CA 95645-0133
PO BOX 134, KNIGHTS LANDING, CA 95645-0134
PO BOX 135, KNIGHTS LANDING, CA 95645-0135
PO BOX 136, KNIGHTS LANDING, CA 95645-0136
PO BOX 137, KNIGHTS LANDING, CA 95645-0137
PO BOX 138, KNIGHTS LANDING, CA 95645-0138
PO BOX 139, KNIGHTS LANDING, CA 95645-0139
PO BOX 140, KNIGHTS LANDING, CA 95645-0140
PO BOX 141, KNIGHTS LANDING, CA 95645-0141
PO BOX 142, KNIGHTS LANDING, CA 95645-0142
PO BOX 143, KNIGHTS LANDING, CA 95645-0143
PO BOX 144, KNIGHTS LANDING, CA 95645-0144
PO BOX 145, KNIGHTS LANDING, CA 95645-0145
PO BOX 146, KNIGHTS LANDING, CA 95645-0146
PO BOX 147, KNIGHTS LANDING, CA 95645-0147
PO BOX 148, KNIGHTS LANDING, CA 95645-0148
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