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, MORENO VALLEY, CA 92556-0001
PO BOX 2, MORENO VALLEY, CA 92556-0002
PO BOX 3, MORENO VALLEY, CA 92556-0003
PO BOX 4, MORENO VALLEY, CA 92556-0004
PO BOX 5, MORENO VALLEY, CA 92556-0005
PO BOX 6, MORENO VALLEY, CA 92556-0006
PO BOX 7, MORENO VALLEY, CA 92556-0007
PO BOX 8, MORENO VALLEY, CA 92556-0008
PO BOX 9, MORENO VALLEY, CA 92556-0009
PO BOX 10, MORENO VALLEY, CA 92556-0010
PO BOX 11, MORENO VALLEY, CA 92556-0011
PO BOX 12, MORENO VALLEY, CA 92556-0012
PO BOX 13, MORENO VALLEY, CA 92556-0013
PO BOX 14, MORENO VALLEY, CA 92556-0014
PO BOX 15, MORENO VALLEY, CA 92556-0015
PO BOX 16, MORENO VALLEY, CA 92556-0016
PO BOX 17, MORENO VALLEY, CA 92556-0017
PO BOX 18, MORENO VALLEY, CA 92556-0018
PO BOX 19, MORENO VALLEY, CA 92556-0019
PO BOX 20, MORENO VALLEY, CA 92556-0020
PO BOX 21, MORENO VALLEY, CA 92556-0021
PO BOX 22, MORENO VALLEY, CA 92556-0022
PO BOX 23, MORENO VALLEY, CA 92556-0023
PO BOX 24, MORENO VALLEY, CA 92556-0024
PO BOX 25, MORENO VALLEY, CA 92556-0025
PO BOX 26, MORENO VALLEY, CA 92556-0026
PO BOX 27, MORENO VALLEY, CA 92556-0027
PO BOX 28, MORENO VALLEY, CA 92556-0028
PO BOX 29, MORENO VALLEY, CA 92556-0029
PO BOX 30, MORENO VALLEY, CA 92556-0030
PO BOX 31, MORENO VALLEY, CA 92556-0031
PO BOX 32, MORENO VALLEY, CA 92556-0032
PO BOX 33, MORENO VALLEY, CA 92556-0033
PO BOX 34, MORENO VALLEY, CA 92556-0034
PO BOX 35, MORENO VALLEY, CA 92556-0035
PO BOX 36, MORENO VALLEY, CA 92556-0036
PO BOX 37, MORENO VALLEY, CA 92556-0037
PO BOX 38, MORENO VALLEY, CA 92556-0038
PO BOX 39, MORENO VALLEY, CA 92556-0039
PO BOX 40, MORENO VALLEY, CA 92556-0040
PO BOX 41, MORENO VALLEY, CA 92556-0041
PO BOX 42, MORENO VALLEY, CA 92556-0042
PO BOX 43, MORENO VALLEY, CA 92556-0043
PO BOX 44, MORENO VALLEY, CA 92556-0044
PO BOX 45, MORENO VALLEY, CA 92556-0045
PO BOX 46, MORENO VALLEY, CA 92556-0046
PO BOX 47, MORENO VALLEY, CA 92556-0047
PO BOX 48, MORENO VALLEY, CA 92556-0048
PO BOX 49, MORENO VALLEY, CA 92556-0049
PO BOX 50, MORENO VALLEY, CA 92556-0050
PO BOX 51, MORENO VALLEY, CA 92556-0051
PO BOX 52, MORENO VALLEY, CA 92556-0052
PO BOX 53, MORENO VALLEY, CA 92556-0053
PO BOX 54, MORENO VALLEY, CA 92556-0054
PO BOX 55, MORENO VALLEY, CA 92556-0055
PO BOX 56, MORENO VALLEY, CA 92556-0056
PO BOX 57, MORENO VALLEY, CA 92556-0057
PO BOX 58, MORENO VALLEY, CA 92556-0058
PO BOX 59, MORENO VALLEY, CA 92556-0059
PO BOX 60, MORENO VALLEY, CA 92556-0060
PO BOX 61, MORENO VALLEY, CA 92556-0061
PO BOX 62, MORENO VALLEY, CA 92556-0062
PO BOX 63, MORENO VALLEY, CA 92556-0063
PO BOX 64, MORENO VALLEY, CA 92556-0064
PO BOX 65, MORENO VALLEY, CA 92556-0065
PO BOX 66, MORENO VALLEY, CA 92556-0066
PO BOX 67, MORENO VALLEY, CA 92556-0067
PO BOX 68, MORENO VALLEY, CA 92556-0068
PO BOX 69, MORENO VALLEY, CA 92556-0069
PO BOX 70, MORENO VALLEY, CA 92556-0070
PO BOX 71, MORENO VALLEY, CA 92556-0071
PO BOX 72, MORENO VALLEY, CA 92556-0072
PO BOX 73, MORENO VALLEY, CA 92556-0073
PO BOX 74, MORENO VALLEY, CA 92556-0074
PO BOX 75, MORENO VALLEY, CA 92556-0075
PO BOX 76, MORENO VALLEY, CA 92556-0076
PO BOX 77, MORENO VALLEY, CA 92556-0077
PO BOX 78, MORENO VALLEY, CA 92556-0078
PO BOX 79, MORENO VALLEY, CA 92556-0079
PO BOX 80, MORENO VALLEY, CA 92556-0080
PO BOX 81, MORENO VALLEY, CA 92556-0081
PO BOX 82, MORENO VALLEY, CA 92556-0082
PO BOX 83, MORENO VALLEY, CA 92556-0083
PO BOX 84, MORENO VALLEY, CA 92556-0084
PO BOX 85, MORENO VALLEY, CA 92556-0085
PO BOX 86, MORENO VALLEY, CA 92556-0086
PO BOX 87, MORENO VALLEY, CA 92556-0087
PO BOX 88, MORENO VALLEY, CA 92556-0088
PO BOX 89, MORENO VALLEY, CA 92556-0089
PO BOX 90, MORENO VALLEY, CA 92556-0090
PO BOX 91, MORENO VALLEY, CA 92556-0091
PO BOX 92, MORENO VALLEY, CA 92556-0092
PO BOX 93, MORENO VALLEY, CA 92556-0093
PO BOX 94, MORENO VALLEY, CA 92556-0094
PO BOX 95, MORENO VALLEY, CA 92556-0095
PO BOX 96, MORENO VALLEY, CA 92556-0096
PO BOX 97, MORENO VALLEY, CA 92556-0097
PO BOX 98, MORENO VALLEY, CA 92556-0098
PO BOX 99, MORENO VALLEY, CA 92556-0099
PO BOX 100, MORENO VALLEY, CA 92556-0100
PO BOX 101, MORENO VALLEY, CA 92556-0101
PO BOX 102, MORENO VALLEY, CA 92556-0102
PO BOX 103, MORENO VALLEY, CA 92556-0103
PO BOX 104, MORENO VALLEY, CA 92556-0104
PO BOX 105, MORENO VALLEY, CA 92556-0105
PO BOX 106, MORENO VALLEY, CA 92556-0106
PO BOX 107, MORENO VALLEY, CA 92556-0107
PO BOX 108, MORENO VALLEY, CA 92556-0108
PO BOX 109, MORENO VALLEY, CA 92556-0109
PO BOX 110, MORENO VALLEY, CA 92556-0110
PO BOX 111, MORENO VALLEY, CA 92556-0111
PO BOX 112, MORENO VALLEY, CA 92556-0112
PO BOX 113, MORENO VALLEY, CA 92556-0113
PO BOX 114, MORENO VALLEY, CA 92556-0114
PO BOX 115, MORENO VALLEY, CA 92556-0115
PO BOX 116, MORENO VALLEY, CA 92556-0116
PO BOX 117, MORENO VALLEY, CA 92556-0117
PO BOX 118, MORENO VALLEY, CA 92556-0118
PO BOX 119, MORENO VALLEY, CA 92556-0119
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