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, WOODLAND HILLS, CA 91365-0001
PO BOX 2, WOODLAND HILLS, CA 91365-0002
PO BOX 3, WOODLAND HILLS, CA 91365-0003
PO BOX 4, WOODLAND HILLS, CA 91365-0004
PO BOX 5, WOODLAND HILLS, CA 91365-0005
PO BOX 6, WOODLAND HILLS, CA 91365-0006
PO BOX 7, WOODLAND HILLS, CA 91365-0007
PO BOX 8, WOODLAND HILLS, CA 91365-0008
PO BOX 9, WOODLAND HILLS, CA 91365-0009
PO BOX 10, WOODLAND HILLS, CA 91365-0010
PO BOX 11, WOODLAND HILLS, CA 91365-0011
PO BOX 12, WOODLAND HILLS, CA 91365-0012
PO BOX 13, WOODLAND HILLS, CA 91365-0013
PO BOX 14, WOODLAND HILLS, CA 91365-0014
PO BOX 15, WOODLAND HILLS, CA 91365-0015
PO BOX 16, WOODLAND HILLS, CA 91365-0016
PO BOX 17, WOODLAND HILLS, CA 91365-0017
PO BOX 18, WOODLAND HILLS, CA 91365-0018
PO BOX 19, WOODLAND HILLS, CA 91365-0019
PO BOX 20, WOODLAND HILLS, CA 91365-0020
PO BOX 21, WOODLAND HILLS, CA 91365-0021
PO BOX 22, WOODLAND HILLS, CA 91365-0022
PO BOX 23, WOODLAND HILLS, CA 91365-0023
PO BOX 24, WOODLAND HILLS, CA 91365-0024
PO BOX 25, WOODLAND HILLS, CA 91365-0025
PO BOX 26, WOODLAND HILLS, CA 91365-0026
PO BOX 27, WOODLAND HILLS, CA 91365-0027
PO BOX 28, WOODLAND HILLS, CA 91365-0028
PO BOX 29, WOODLAND HILLS, CA 91365-0029
PO BOX 30, WOODLAND HILLS, CA 91365-0030
PO BOX 31, WOODLAND HILLS, CA 91365-0031
PO BOX 32, WOODLAND HILLS, CA 91365-0032
PO BOX 33, WOODLAND HILLS, CA 91365-0033
PO BOX 34, WOODLAND HILLS, CA 91365-0034
PO BOX 35, WOODLAND HILLS, CA 91365-0035
PO BOX 36, WOODLAND HILLS, CA 91365-0036
PO BOX 37, WOODLAND HILLS, CA 91365-0037
PO BOX 38, WOODLAND HILLS, CA 91365-0038
PO BOX 39, WOODLAND HILLS, CA 91365-0039
PO BOX 40, WOODLAND HILLS, CA 91365-0040
PO BOX 41, WOODLAND HILLS, CA 91365-0041
PO BOX 42, WOODLAND HILLS, CA 91365-0042
PO BOX 43, WOODLAND HILLS, CA 91365-0043
PO BOX 44, WOODLAND HILLS, CA 91365-0044
PO BOX 45, WOODLAND HILLS, CA 91365-0045
PO BOX 46, WOODLAND HILLS, CA 91365-0046
PO BOX 47, WOODLAND HILLS, CA 91365-0047
PO BOX 48, WOODLAND HILLS, CA 91365-0048
PO BOX 49, WOODLAND HILLS, CA 91365-0049
PO BOX 50, WOODLAND HILLS, CA 91365-0050
PO BOX 51, WOODLAND HILLS, CA 91365-0051
PO BOX 52, WOODLAND HILLS, CA 91365-0052
PO BOX 53, WOODLAND HILLS, CA 91365-0053
PO BOX 54, WOODLAND HILLS, CA 91365-0054
PO BOX 55, WOODLAND HILLS, CA 91365-0055
PO BOX 56, WOODLAND HILLS, CA 91365-0056
PO BOX 57, WOODLAND HILLS, CA 91365-0057
PO BOX 58, WOODLAND HILLS, CA 91365-0058
PO BOX 59, WOODLAND HILLS, CA 91365-0059
PO BOX 60, WOODLAND HILLS, CA 91365-0060
PO BOX 61, WOODLAND HILLS, CA 91365-0061
PO BOX 62, WOODLAND HILLS, CA 91365-0062
PO BOX 63, WOODLAND HILLS, CA 91365-0063
PO BOX 64, WOODLAND HILLS, CA 91365-0064
PO BOX 65, WOODLAND HILLS, CA 91365-0065
PO BOX 66, WOODLAND HILLS, CA 91365-0066
PO BOX 67, WOODLAND HILLS, CA 91365-0067
PO BOX 68, WOODLAND HILLS, CA 91365-0068
PO BOX 69, WOODLAND HILLS, CA 91365-0069
PO BOX 70, WOODLAND HILLS, CA 91365-0070
PO BOX 71, WOODLAND HILLS, CA 91365-0071
PO BOX 72, WOODLAND HILLS, CA 91365-0072
PO BOX 73, WOODLAND HILLS, CA 91365-0073
PO BOX 74, WOODLAND HILLS, CA 91365-0074
PO BOX 75, WOODLAND HILLS, CA 91365-0075
PO BOX 76, WOODLAND HILLS, CA 91365-0076
PO BOX 77, WOODLAND HILLS, CA 91365-0077
PO BOX 78, WOODLAND HILLS, CA 91365-0078
PO BOX 79, WOODLAND HILLS, CA 91365-0079
PO BOX 80, WOODLAND HILLS, CA 91365-0080
PO BOX 81, WOODLAND HILLS, CA 91365-0081
PO BOX 82, WOODLAND HILLS, CA 91365-0082
PO BOX 83, WOODLAND HILLS, CA 91365-0083
PO BOX 84, WOODLAND HILLS, CA 91365-0084
PO BOX 85, WOODLAND HILLS, CA 91365-0085
PO BOX 86, WOODLAND HILLS, CA 91365-0086
PO BOX 87, WOODLAND HILLS, CA 91365-0087
PO BOX 88, WOODLAND HILLS, CA 91365-0088
PO BOX 89, WOODLAND HILLS, CA 91365-0089
PO BOX 90, WOODLAND HILLS, CA 91365-0090
PO BOX 91, WOODLAND HILLS, CA 91365-0091
PO BOX 92, WOODLAND HILLS, CA 91365-0092
PO BOX 93, WOODLAND HILLS, CA 91365-0093
PO BOX 94, WOODLAND HILLS, CA 91365-0094
PO BOX 95, WOODLAND HILLS, CA 91365-0095
PO BOX 96, WOODLAND HILLS, CA 91365-0096
PO BOX 97, WOODLAND HILLS, CA 91365-0097
PO BOX 98, WOODLAND HILLS, CA 91365-0098
PO BOX 99, WOODLAND HILLS, CA 91365-0099
PO BOX 100, WOODLAND HILLS, CA 91365-0100
PO BOX 101, WOODLAND HILLS, CA 91365-0101
PO BOX 102, WOODLAND HILLS, CA 91365-0102
PO BOX 103, WOODLAND HILLS, CA 91365-0103
PO BOX 104, WOODLAND HILLS, CA 91365-0104
PO BOX 105, WOODLAND HILLS, CA 91365-0105
PO BOX 106, WOODLAND HILLS, CA 91365-0106
PO BOX 107, WOODLAND HILLS, CA 91365-0107
PO BOX 108, WOODLAND HILLS, CA 91365-0108
PO BOX 109, WOODLAND HILLS, CA 91365-0109
PO BOX 110, WOODLAND HILLS, CA 91365-0110
PO BOX 111, WOODLAND HILLS, CA 91365-0111
PO BOX 112, WOODLAND HILLS, CA 91365-0112
PO BOX 113, WOODLAND HILLS, CA 91365-0113
PO BOX 114, WOODLAND HILLS, CA 91365-0114
PO BOX 115, WOODLAND HILLS, CA 91365-0115
PO BOX 116, WOODLAND HILLS, CA 91365-0116
PO BOX 117, WOODLAND HILLS, CA 91365-0117
PO BOX 118, WOODLAND HILLS, CA 91365-0118
PO BOX 119, WOODLAND HILLS, CA 91365-0119
PO BOX 120, WOODLAND HILLS, CA 91365-0120
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