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, GRIZZLY FLATS, CA 95636-0001
PO BOX 2, GRIZZLY FLATS, CA 95636-0002
PO BOX 3, GRIZZLY FLATS, CA 95636-0003
PO BOX 4, GRIZZLY FLATS, CA 95636-0004
PO BOX 5, GRIZZLY FLATS, CA 95636-0005
PO BOX 6, GRIZZLY FLATS, CA 95636-0006
PO BOX 7, GRIZZLY FLATS, CA 95636-0007
PO BOX 8, GRIZZLY FLATS, CA 95636-0008
PO BOX 9, GRIZZLY FLATS, CA 95636-0009
PO BOX 10, GRIZZLY FLATS, CA 95636-0010
PO BOX 11, GRIZZLY FLATS, CA 95636-0011
PO BOX 12, GRIZZLY FLATS, CA 95636-0012
PO BOX 13, GRIZZLY FLATS, CA 95636-0013
PO BOX 14, GRIZZLY FLATS, CA 95636-0014
PO BOX 15, GRIZZLY FLATS, CA 95636-0015
PO BOX 16, GRIZZLY FLATS, CA 95636-0016
PO BOX 17, GRIZZLY FLATS, CA 95636-0017
PO BOX 18, GRIZZLY FLATS, CA 95636-0018
PO BOX 19, GRIZZLY FLATS, CA 95636-0019
PO BOX 20, GRIZZLY FLATS, CA 95636-0020
PO BOX 21, GRIZZLY FLATS, CA 95636-0021
PO BOX 22, GRIZZLY FLATS, CA 95636-0022
PO BOX 23, GRIZZLY FLATS, CA 95636-0023
PO BOX 24, GRIZZLY FLATS, CA 95636-0024
PO BOX 25, GRIZZLY FLATS, CA 95636-0025
PO BOX 26, GRIZZLY FLATS, CA 95636-0026
PO BOX 27, GRIZZLY FLATS, CA 95636-0027
PO BOX 28, GRIZZLY FLATS, CA 95636-0028
PO BOX 29, GRIZZLY FLATS, CA 95636-0029
PO BOX 30, GRIZZLY FLATS, CA 95636-0030
PO BOX 31, GRIZZLY FLATS, CA 95636-0031
PO BOX 32, GRIZZLY FLATS, CA 95636-0032
PO BOX 33, GRIZZLY FLATS, CA 95636-0033
PO BOX 34, GRIZZLY FLATS, CA 95636-0034
PO BOX 35, GRIZZLY FLATS, CA 95636-0035
PO BOX 36, GRIZZLY FLATS, CA 95636-0036
PO BOX 37, GRIZZLY FLATS, CA 95636-0037
PO BOX 38, GRIZZLY FLATS, CA 95636-0038
PO BOX 39, GRIZZLY FLATS, CA 95636-0039
PO BOX 40, GRIZZLY FLATS, CA 95636-0040
PO BOX 41, GRIZZLY FLATS, CA 95636-0041
PO BOX 42, GRIZZLY FLATS, CA 95636-0042
PO BOX 43, GRIZZLY FLATS, CA 95636-0043
PO BOX 44, GRIZZLY FLATS, CA 95636-0044
PO BOX 45, GRIZZLY FLATS, CA 95636-0045
PO BOX 46, GRIZZLY FLATS, CA 95636-0046
PO BOX 47, GRIZZLY FLATS, CA 95636-0047
PO BOX 48, GRIZZLY FLATS, CA 95636-0048
PO BOX 49, GRIZZLY FLATS, CA 95636-0049
PO BOX 50, GRIZZLY FLATS, CA 95636-0050
PO BOX 51, GRIZZLY FLATS, CA 95636-0051
PO BOX 52, GRIZZLY FLATS, CA 95636-0052
PO BOX 53, GRIZZLY FLATS, CA 95636-0053
PO BOX 54, GRIZZLY FLATS, CA 95636-0054
PO BOX 55, GRIZZLY FLATS, CA 95636-0055
PO BOX 56, GRIZZLY FLATS, CA 95636-0056
PO BOX 57, GRIZZLY FLATS, CA 95636-0057
PO BOX 58, GRIZZLY FLATS, CA 95636-0058
PO BOX 59, GRIZZLY FLATS, CA 95636-0059
PO BOX 60, GRIZZLY FLATS, CA 95636-0060
PO BOX 61, GRIZZLY FLATS, CA 95636-0061
PO BOX 62, GRIZZLY FLATS, CA 95636-0062
PO BOX 63, GRIZZLY FLATS, CA 95636-0063
PO BOX 64, GRIZZLY FLATS, CA 95636-0064
PO BOX 65, GRIZZLY FLATS, CA 95636-0065
PO BOX 66, GRIZZLY FLATS, CA 95636-0066
PO BOX 67, GRIZZLY FLATS, CA 95636-0067
PO BOX 68, GRIZZLY FLATS, CA 95636-0068
PO BOX 69, GRIZZLY FLATS, CA 95636-0069
PO BOX 70, GRIZZLY FLATS, CA 95636-0070
PO BOX 71, GRIZZLY FLATS, CA 95636-0071
PO BOX 72, GRIZZLY FLATS, CA 95636-0072
PO BOX 73, GRIZZLY FLATS, CA 95636-0073
PO BOX 74, GRIZZLY FLATS, CA 95636-0074
PO BOX 75, GRIZZLY FLATS, CA 95636-0075
PO BOX 76, GRIZZLY FLATS, CA 95636-0076
PO BOX 77, GRIZZLY FLATS, CA 95636-0077
PO BOX 78, GRIZZLY FLATS, CA 95636-0078
PO BOX 79, GRIZZLY FLATS, CA 95636-0079
PO BOX 80, GRIZZLY FLATS, CA 95636-0080
PO BOX 81, GRIZZLY FLATS, CA 95636-0081
PO BOX 82, GRIZZLY FLATS, CA 95636-0082
PO BOX 83, GRIZZLY FLATS, CA 95636-0083
PO BOX 84, GRIZZLY FLATS, CA 95636-0084
PO BOX 85, GRIZZLY FLATS, CA 95636-0085
PO BOX 86, GRIZZLY FLATS, CA 95636-0086
PO BOX 87, GRIZZLY FLATS, CA 95636-0087
PO BOX 88, GRIZZLY FLATS, CA 95636-0088
PO BOX 89, GRIZZLY FLATS, CA 95636-0089
PO BOX 90, GRIZZLY FLATS, CA 95636-0090
PO BOX 91, GRIZZLY FLATS, CA 95636-0091
PO BOX 92, GRIZZLY FLATS, CA 95636-0092
PO BOX 93, GRIZZLY FLATS, CA 95636-0093
PO BOX 94, GRIZZLY FLATS, CA 95636-0094
PO BOX 95, GRIZZLY FLATS, CA 95636-0095
PO BOX 96, GRIZZLY FLATS, CA 95636-0096
PO BOX 97, GRIZZLY FLATS, CA 95636-0097
PO BOX 98, GRIZZLY FLATS, CA 95636-0098
PO BOX 99, GRIZZLY FLATS, CA 95636-0099
PO BOX 100, GRIZZLY FLATS, CA 95636-0100
PO BOX 101, GRIZZLY FLATS, CA 95636-0101
PO BOX 102, GRIZZLY FLATS, CA 95636-0102
PO BOX 103, GRIZZLY FLATS, CA 95636-0103
PO BOX 104, GRIZZLY FLATS, CA 95636-0104
PO BOX 105, GRIZZLY FLATS, CA 95636-0105
PO BOX 106, GRIZZLY FLATS, CA 95636-0106
PO BOX 107, GRIZZLY FLATS, CA 95636-0107
PO BOX 108, GRIZZLY FLATS, CA 95636-0108
PO BOX 109, GRIZZLY FLATS, CA 95636-0109
PO BOX 110, GRIZZLY FLATS, CA 95636-0110
PO BOX 111, GRIZZLY FLATS, CA 95636-0111
PO BOX 112, GRIZZLY FLATS, CA 95636-0112
PO BOX 113, GRIZZLY FLATS, CA 95636-0113
PO BOX 114, GRIZZLY FLATS, CA 95636-0114
PO BOX 115, GRIZZLY FLATS, CA 95636-0115
PO BOX 116, GRIZZLY FLATS, CA 95636-0116
PO BOX 117, GRIZZLY FLATS, CA 95636-0117
PO BOX 118, GRIZZLY FLATS, CA 95636-0118
PO BOX 119, GRIZZLY FLATS, CA 95636-0119
PO BOX 120, GRIZZLY FLATS, CA 95636-0120
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