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, SANTA MARIA, CA 93456-0001
PO BOX 2, SANTA MARIA, CA 93456-0002
PO BOX 3, SANTA MARIA, CA 93456-0003
PO BOX 4, SANTA MARIA, CA 93456-0004
PO BOX 5, SANTA MARIA, CA 93456-0005
PO BOX 6, SANTA MARIA, CA 93456-0006
PO BOX 7, SANTA MARIA, CA 93456-0007
PO BOX 8, SANTA MARIA, CA 93456-0008
PO BOX 9, SANTA MARIA, CA 93456-0009
PO BOX 10, SANTA MARIA, CA 93456-0010
PO BOX 11, SANTA MARIA, CA 93456-0011
PO BOX 12, SANTA MARIA, CA 93456-0012
PO BOX 13, SANTA MARIA, CA 93456-0013
PO BOX 14, SANTA MARIA, CA 93456-0014
PO BOX 15, SANTA MARIA, CA 93456-0015
PO BOX 16, SANTA MARIA, CA 93456-0016
PO BOX 17, SANTA MARIA, CA 93456-0017
PO BOX 18, SANTA MARIA, CA 93456-0018
PO BOX 19, SANTA MARIA, CA 93456-0019
PO BOX 20, SANTA MARIA, CA 93456-0020
PO BOX 21, SANTA MARIA, CA 93456-0021
PO BOX 22, SANTA MARIA, CA 93456-0022
PO BOX 23, SANTA MARIA, CA 93456-0023
PO BOX 24, SANTA MARIA, CA 93456-0024
PO BOX 25, SANTA MARIA, CA 93456-0025
PO BOX 26, SANTA MARIA, CA 93456-0026
PO BOX 27, SANTA MARIA, CA 93456-0027
PO BOX 28, SANTA MARIA, CA 93456-0028
PO BOX 29, SANTA MARIA, CA 93456-0029
PO BOX 30, SANTA MARIA, CA 93456-0030
PO BOX 31, SANTA MARIA, CA 93456-0031
PO BOX 32, SANTA MARIA, CA 93456-0032
PO BOX 33, SANTA MARIA, CA 93456-0033
PO BOX 34, SANTA MARIA, CA 93456-0034
PO BOX 35, SANTA MARIA, CA 93456-0035
PO BOX 36, SANTA MARIA, CA 93456-0036
PO BOX 37, SANTA MARIA, CA 93456-0037
PO BOX 38, SANTA MARIA, CA 93456-0038
PO BOX 39, SANTA MARIA, CA 93456-0039
PO BOX 40, SANTA MARIA, CA 93456-0040
PO BOX 41, SANTA MARIA, CA 93456-0041
PO BOX 42, SANTA MARIA, CA 93456-0042
PO BOX 43, SANTA MARIA, CA 93456-0043
PO BOX 44, SANTA MARIA, CA 93456-0044
PO BOX 45, SANTA MARIA, CA 93456-0045
PO BOX 46, SANTA MARIA, CA 93456-0046
PO BOX 47, SANTA MARIA, CA 93456-0047
PO BOX 48, SANTA MARIA, CA 93456-0048
PO BOX 49, SANTA MARIA, CA 93456-0049
PO BOX 50, SANTA MARIA, CA 93456-0050
PO BOX 51, SANTA MARIA, CA 93456-0051
PO BOX 52, SANTA MARIA, CA 93456-0052
PO BOX 53, SANTA MARIA, CA 93456-0053
PO BOX 54, SANTA MARIA, CA 93456-0054
PO BOX 55, SANTA MARIA, CA 93456-0055
PO BOX 56, SANTA MARIA, CA 93456-0056
PO BOX 57, SANTA MARIA, CA 93456-0057
PO BOX 58, SANTA MARIA, CA 93456-0058
PO BOX 59, SANTA MARIA, CA 93456-0059
PO BOX 60, SANTA MARIA, CA 93456-0060
PO BOX 61, SANTA MARIA, CA 93456-0061
PO BOX 62, SANTA MARIA, CA 93456-0062
PO BOX 63, SANTA MARIA, CA 93456-0063
PO BOX 64, SANTA MARIA, CA 93456-0064
PO BOX 65, SANTA MARIA, CA 93456-0065
PO BOX 66, SANTA MARIA, CA 93456-0066
PO BOX 67, SANTA MARIA, CA 93456-0067
PO BOX 68, SANTA MARIA, CA 93456-0068
PO BOX 69, SANTA MARIA, CA 93456-0069
PO BOX 70, SANTA MARIA, CA 93456-0070
PO BOX 71, SANTA MARIA, CA 93456-0071
PO BOX 72, SANTA MARIA, CA 93456-0072
PO BOX 73, SANTA MARIA, CA 93456-0073
PO BOX 74, SANTA MARIA, CA 93456-0074
PO BOX 75, SANTA MARIA, CA 93456-0075
PO BOX 76, SANTA MARIA, CA 93456-0076
PO BOX 77, SANTA MARIA, CA 93456-0077
PO BOX 78, SANTA MARIA, CA 93456-0078
PO BOX 79, SANTA MARIA, CA 93456-0079
PO BOX 80, SANTA MARIA, CA 93456-0080
PO BOX 81, SANTA MARIA, CA 93456-0081
PO BOX 82, SANTA MARIA, CA 93456-0082
PO BOX 83, SANTA MARIA, CA 93456-0083
PO BOX 84, SANTA MARIA, CA 93456-0084
PO BOX 85, SANTA MARIA, CA 93456-0085
PO BOX 86, SANTA MARIA, CA 93456-0086
PO BOX 87, SANTA MARIA, CA 93456-0087
PO BOX 88, SANTA MARIA, CA 93456-0088
PO BOX 89, SANTA MARIA, CA 93456-0089
PO BOX 90, SANTA MARIA, CA 93456-0090
PO BOX 91, SANTA MARIA, CA 93456-0091
PO BOX 92, SANTA MARIA, CA 93456-0092
PO BOX 93, SANTA MARIA, CA 93456-0093
PO BOX 94, SANTA MARIA, CA 93456-0094
PO BOX 95, SANTA MARIA, CA 93456-0095
PO BOX 96, SANTA MARIA, CA 93456-0096
PO BOX 97, SANTA MARIA, CA 93456-0097
PO BOX 98, SANTA MARIA, CA 93456-0098
PO BOX 99, SANTA MARIA, CA 93456-0099
PO BOX 100, SANTA MARIA, CA 93456-0100
PO BOX 101, SANTA MARIA, CA 93456-0101
PO BOX 102, SANTA MARIA, CA 93456-0102
PO BOX 103, SANTA MARIA, CA 93456-0103
PO BOX 104, SANTA MARIA, CA 93456-0104
PO BOX 105, SANTA MARIA, CA 93456-0105
PO BOX 106, SANTA MARIA, CA 93456-0106
PO BOX 107, SANTA MARIA, CA 93456-0107
PO BOX 108, SANTA MARIA, CA 93456-0108
PO BOX 109, SANTA MARIA, CA 93456-0109
PO BOX 110, SANTA MARIA, CA 93456-0110
PO BOX 111, SANTA MARIA, CA 93456-0111
PO BOX 112, SANTA MARIA, CA 93456-0112
PO BOX 113, SANTA MARIA, CA 93456-0113
PO BOX 114, SANTA MARIA, CA 93456-0114
PO BOX 115, SANTA MARIA, CA 93456-0115
PO BOX 116, SANTA MARIA, CA 93456-0116
PO BOX 117, SANTA MARIA, CA 93456-0117
PO BOX 118, SANTA MARIA, CA 93456-0118
PO BOX 119, SANTA MARIA, CA 93456-0119
PO BOX 120, SANTA MARIA, CA 93456-0120
PO BOX 121, SANTA MARIA, CA 93456-0121
PO BOX 122, SANTA MARIA, CA 93456-0122
PO BOX 123, SANTA MARIA, CA 93456-0123
PO BOX 124, SANTA MARIA, CA 93456-0124
PO BOX 125, SANTA MARIA, CA 93456-0125
PO BOX 126, SANTA MARIA, CA 93456-0126
PO BOX 127, SANTA MARIA, CA 93456-0127
PO BOX 128, SANTA MARIA, CA 93456-0128
PO BOX 129, SANTA MARIA, CA 93456-0129
PO BOX 130, SANTA MARIA, CA 93456-0130
PO BOX 131, SANTA MARIA, CA 93456-0131
PO BOX 132, SANTA MARIA, CA 93456-0132
PO BOX 133, SANTA MARIA, CA 93456-0133
PO BOX 134, SANTA MARIA, CA 93456-0134
PO BOX 135, SANTA MARIA, CA 93456-0135
PO BOX 136, SANTA MARIA, CA 93456-0136
PO BOX 137, SANTA MARIA, CA 93456-0137
PO BOX 138, SANTA MARIA, CA 93456-0138
PO BOX 139, SANTA MARIA, CA 93456-0139
PO BOX 140, SANTA MARIA, CA 93456-0140
PO BOX 141, SANTA MARIA, CA 93456-0141
PO BOX 142, SANTA MARIA, CA 93456-0142
PO BOX 143, SANTA MARIA, CA 93456-0143
PO BOX 144, SANTA MARIA, CA 93456-0144
PO BOX 145, SANTA MARIA, CA 93456-0145
PO BOX 146, SANTA MARIA, CA 93456-0146
PO BOX 147, SANTA MARIA, CA 93456-0147
PO BOX 148, SANTA MARIA, CA 93456-0148
PO BOX 149, SANTA MARIA, CA 93456-0149
PO BOX 150, SANTA MARIA, CA 93456-0150
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