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, ARROYO GRANDE, CA 93421-0001
PO BOX 2, ARROYO GRANDE, CA 93421-0002
PO BOX 3, ARROYO GRANDE, CA 93421-0003
PO BOX 4, ARROYO GRANDE, CA 93421-0004
PO BOX 5, ARROYO GRANDE, CA 93421-0005
PO BOX 6, ARROYO GRANDE, CA 93421-0006
PO BOX 7, ARROYO GRANDE, CA 93421-0007
PO BOX 8, ARROYO GRANDE, CA 93421-0008
PO BOX 9, ARROYO GRANDE, CA 93421-0009
PO BOX 10, ARROYO GRANDE, CA 93421-0010
PO BOX 11, ARROYO GRANDE, CA 93421-0011
PO BOX 12, ARROYO GRANDE, CA 93421-0012
PO BOX 13, ARROYO GRANDE, CA 93421-0013
PO BOX 14, ARROYO GRANDE, CA 93421-0014
PO BOX 15, ARROYO GRANDE, CA 93421-0015
PO BOX 16, ARROYO GRANDE, CA 93421-0016
PO BOX 17, ARROYO GRANDE, CA 93421-0017
PO BOX 18, ARROYO GRANDE, CA 93421-0018
PO BOX 19, ARROYO GRANDE, CA 93421-0019
PO BOX 20, ARROYO GRANDE, CA 93421-0020
PO BOX 21, ARROYO GRANDE, CA 93421-0021
PO BOX 22, ARROYO GRANDE, CA 93421-0022
PO BOX 23, ARROYO GRANDE, CA 93421-0023
PO BOX 24, ARROYO GRANDE, CA 93421-0024
PO BOX 25, ARROYO GRANDE, CA 93421-0025
PO BOX 26, ARROYO GRANDE, CA 93421-0026
PO BOX 27, ARROYO GRANDE, CA 93421-0027
PO BOX 28, ARROYO GRANDE, CA 93421-0028
PO BOX 29, ARROYO GRANDE, CA 93421-0029
PO BOX 30, ARROYO GRANDE, CA 93421-0030
PO BOX 31, ARROYO GRANDE, CA 93421-0031
PO BOX 32, ARROYO GRANDE, CA 93421-0032
PO BOX 33, ARROYO GRANDE, CA 93421-0033
PO BOX 34, ARROYO GRANDE, CA 93421-0034
PO BOX 35, ARROYO GRANDE, CA 93421-0035
PO BOX 36, ARROYO GRANDE, CA 93421-0036
PO BOX 37, ARROYO GRANDE, CA 93421-0037
PO BOX 38, ARROYO GRANDE, CA 93421-0038
PO BOX 39, ARROYO GRANDE, CA 93421-0039
PO BOX 40, ARROYO GRANDE, CA 93421-0040
PO BOX 41, ARROYO GRANDE, CA 93421-0041
PO BOX 42, ARROYO GRANDE, CA 93421-0042
PO BOX 43, ARROYO GRANDE, CA 93421-0043
PO BOX 44, ARROYO GRANDE, CA 93421-0044
PO BOX 45, ARROYO GRANDE, CA 93421-0045
PO BOX 46, ARROYO GRANDE, CA 93421-0046
PO BOX 47, ARROYO GRANDE, CA 93421-0047
PO BOX 48, ARROYO GRANDE, CA 93421-0048
PO BOX 49, ARROYO GRANDE, CA 93421-0049
PO BOX 50, ARROYO GRANDE, CA 93421-0050
PO BOX 51, ARROYO GRANDE, CA 93421-0051
PO BOX 52, ARROYO GRANDE, CA 93421-0052
PO BOX 53, ARROYO GRANDE, CA 93421-0053
PO BOX 54, ARROYO GRANDE, CA 93421-0054
PO BOX 55, ARROYO GRANDE, CA 93421-0055
PO BOX 56, ARROYO GRANDE, CA 93421-0056
PO BOX 57, ARROYO GRANDE, CA 93421-0057
PO BOX 58, ARROYO GRANDE, CA 93421-0058
PO BOX 59, ARROYO GRANDE, CA 93421-0059
PO BOX 60, ARROYO GRANDE, CA 93421-0060
PO BOX 61, ARROYO GRANDE, CA 93421-0061
PO BOX 62, ARROYO GRANDE, CA 93421-0062
PO BOX 63, ARROYO GRANDE, CA 93421-0063
PO BOX 64, ARROYO GRANDE, CA 93421-0064
PO BOX 65, ARROYO GRANDE, CA 93421-0065
PO BOX 66, ARROYO GRANDE, CA 93421-0066
PO BOX 67, ARROYO GRANDE, CA 93421-0067
PO BOX 68, ARROYO GRANDE, CA 93421-0068
PO BOX 69, ARROYO GRANDE, CA 93421-0069
PO BOX 70, ARROYO GRANDE, CA 93421-0070
PO BOX 71, ARROYO GRANDE, CA 93421-0071
PO BOX 72, ARROYO GRANDE, CA 93421-0072
PO BOX 73, ARROYO GRANDE, CA 93421-0073
PO BOX 74, ARROYO GRANDE, CA 93421-0074
PO BOX 75, ARROYO GRANDE, CA 93421-0075
PO BOX 76, ARROYO GRANDE, CA 93421-0076
PO BOX 77, ARROYO GRANDE, CA 93421-0077
PO BOX 78, ARROYO GRANDE, CA 93421-0078
PO BOX 79, ARROYO GRANDE, CA 93421-0079
PO BOX 80, ARROYO GRANDE, CA 93421-0080
PO BOX 81, ARROYO GRANDE, CA 93421-0081
PO BOX 82, ARROYO GRANDE, CA 93421-0082
PO BOX 83, ARROYO GRANDE, CA 93421-0083
PO BOX 84, ARROYO GRANDE, CA 93421-0084
PO BOX 85, ARROYO GRANDE, CA 93421-0085
PO BOX 86, ARROYO GRANDE, CA 93421-0086
PO BOX 87, ARROYO GRANDE, CA 93421-0087
PO BOX 88, ARROYO GRANDE, CA 93421-0088
PO BOX 89, ARROYO GRANDE, CA 93421-0089
PO BOX 90, ARROYO GRANDE, CA 93421-0090
PO BOX 91, ARROYO GRANDE, CA 93421-0091
PO BOX 92, ARROYO GRANDE, CA 93421-0092
PO BOX 93, ARROYO GRANDE, CA 93421-0093
PO BOX 94, ARROYO GRANDE, CA 93421-0094
PO BOX 95, ARROYO GRANDE, CA 93421-0095
PO BOX 96, ARROYO GRANDE, CA 93421-0096
PO BOX 97, ARROYO GRANDE, CA 93421-0097
PO BOX 98, ARROYO GRANDE, CA 93421-0098
PO BOX 99, ARROYO GRANDE, CA 93421-0099
PO BOX 100, ARROYO GRANDE, CA 93421-0100
PO BOX 101, ARROYO GRANDE, CA 93421-0101
PO BOX 102, ARROYO GRANDE, CA 93421-0102
PO BOX 103, ARROYO GRANDE, CA 93421-0103
PO BOX 104, ARROYO GRANDE, CA 93421-0104
PO BOX 105, ARROYO GRANDE, CA 93421-0105
PO BOX 106, ARROYO GRANDE, CA 93421-0106
PO BOX 107, ARROYO GRANDE, CA 93421-0107
PO BOX 108, ARROYO GRANDE, CA 93421-0108
PO BOX 109, ARROYO GRANDE, CA 93421-0109
PO BOX 110, ARROYO GRANDE, CA 93421-0110
PO BOX 111, ARROYO GRANDE, CA 93421-0111
PO BOX 112, ARROYO GRANDE, CA 93421-0112
PO BOX 113, ARROYO GRANDE, CA 93421-0113
PO BOX 114, ARROYO GRANDE, CA 93421-0114
PO BOX 115, ARROYO GRANDE, CA 93421-0115
PO BOX 116, ARROYO GRANDE, CA 93421-0116
PO BOX 117, ARROYO GRANDE, CA 93421-0117
PO BOX 118, ARROYO GRANDE, CA 93421-0118
PO BOX 119, ARROYO GRANDE, CA 93421-0119
PO BOX 120, ARROYO GRANDE, CA 93421-0120
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