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, NATIONAL CITY, CA 91951-0001
PO BOX 2, NATIONAL CITY, CA 91951-0002
PO BOX 3, NATIONAL CITY, CA 91951-0003
PO BOX 4, NATIONAL CITY, CA 91951-0004
PO BOX 5, NATIONAL CITY, CA 91951-0005
PO BOX 6, NATIONAL CITY, CA 91951-0006
PO BOX 7, NATIONAL CITY, CA 91951-0007
PO BOX 8, NATIONAL CITY, CA 91951-0008
PO BOX 9, NATIONAL CITY, CA 91951-0009
PO BOX 10, NATIONAL CITY, CA 91951-0010
PO BOX 11, NATIONAL CITY, CA 91951-0011
PO BOX 12, NATIONAL CITY, CA 91951-0012
PO BOX 13, NATIONAL CITY, CA 91951-0013
PO BOX 14, NATIONAL CITY, CA 91951-0014
PO BOX 15, NATIONAL CITY, CA 91951-0015
PO BOX 16, NATIONAL CITY, CA 91951-0016
PO BOX 17, NATIONAL CITY, CA 91951-0017
PO BOX 18, NATIONAL CITY, CA 91951-0018
PO BOX 19, NATIONAL CITY, CA 91951-0019
PO BOX 20, NATIONAL CITY, CA 91951-0020
PO BOX 21, NATIONAL CITY, CA 91951-0021
PO BOX 22, NATIONAL CITY, CA 91951-0022
PO BOX 23, NATIONAL CITY, CA 91951-0023
PO BOX 24, NATIONAL CITY, CA 91951-0024
PO BOX 25, NATIONAL CITY, CA 91951-0025
PO BOX 26, NATIONAL CITY, CA 91951-0026
PO BOX 27, NATIONAL CITY, CA 91951-0027
PO BOX 28, NATIONAL CITY, CA 91951-0028
PO BOX 29, NATIONAL CITY, CA 91951-0029
PO BOX 30, NATIONAL CITY, CA 91951-0030
PO BOX 31, NATIONAL CITY, CA 91951-0031
PO BOX 32, NATIONAL CITY, CA 91951-0032
PO BOX 33, NATIONAL CITY, CA 91951-0033
PO BOX 34, NATIONAL CITY, CA 91951-0034
PO BOX 35, NATIONAL CITY, CA 91951-0035
PO BOX 36, NATIONAL CITY, CA 91951-0036
PO BOX 37, NATIONAL CITY, CA 91951-0037
PO BOX 38, NATIONAL CITY, CA 91951-0038
PO BOX 39, NATIONAL CITY, CA 91951-0039
PO BOX 40, NATIONAL CITY, CA 91951-0040
PO BOX 41, NATIONAL CITY, CA 91951-0041
PO BOX 42, NATIONAL CITY, CA 91951-0042
PO BOX 43, NATIONAL CITY, CA 91951-0043
PO BOX 44, NATIONAL CITY, CA 91951-0044
PO BOX 45, NATIONAL CITY, CA 91951-0045
PO BOX 46, NATIONAL CITY, CA 91951-0046
PO BOX 47, NATIONAL CITY, CA 91951-0047
PO BOX 48, NATIONAL CITY, CA 91951-0048
PO BOX 49, NATIONAL CITY, CA 91951-0049
PO BOX 50, NATIONAL CITY, CA 91951-0050
PO BOX 51, NATIONAL CITY, CA 91951-0051
PO BOX 52, NATIONAL CITY, CA 91951-0052
PO BOX 53, NATIONAL CITY, CA 91951-0053
PO BOX 54, NATIONAL CITY, CA 91951-0054
PO BOX 55, NATIONAL CITY, CA 91951-0055
PO BOX 56, NATIONAL CITY, CA 91951-0056
PO BOX 57, NATIONAL CITY, CA 91951-0057
PO BOX 58, NATIONAL CITY, CA 91951-0058
PO BOX 59, NATIONAL CITY, CA 91951-0059
PO BOX 60, NATIONAL CITY, CA 91951-0060
PO BOX 61, NATIONAL CITY, CA 91951-0061
PO BOX 62, NATIONAL CITY, CA 91951-0062
PO BOX 63, NATIONAL CITY, CA 91951-0063
PO BOX 64, NATIONAL CITY, CA 91951-0064
PO BOX 65, NATIONAL CITY, CA 91951-0065
PO BOX 66, NATIONAL CITY, CA 91951-0066
PO BOX 67, NATIONAL CITY, CA 91951-0067
PO BOX 68, NATIONAL CITY, CA 91951-0068
PO BOX 69, NATIONAL CITY, CA 91951-0069
PO BOX 70, NATIONAL CITY, CA 91951-0070
PO BOX 71, NATIONAL CITY, CA 91951-0071
PO BOX 72, NATIONAL CITY, CA 91951-0072
PO BOX 73, NATIONAL CITY, CA 91951-0073
PO BOX 74, NATIONAL CITY, CA 91951-0074
PO BOX 75, NATIONAL CITY, CA 91951-0075
PO BOX 76, NATIONAL CITY, CA 91951-0076
PO BOX 77, NATIONAL CITY, CA 91951-0077
PO BOX 78, NATIONAL CITY, CA 91951-0078
PO BOX 79, NATIONAL CITY, CA 91951-0079
PO BOX 80, NATIONAL CITY, CA 91951-0080
PO BOX 81, NATIONAL CITY, CA 91951-0081
PO BOX 82, NATIONAL CITY, CA 91951-0082
PO BOX 83, NATIONAL CITY, CA 91951-0083
PO BOX 84, NATIONAL CITY, CA 91951-0084
PO BOX 85, NATIONAL CITY, CA 91951-0085
PO BOX 86, NATIONAL CITY, CA 91951-0086
PO BOX 87, NATIONAL CITY, CA 91951-0087
PO BOX 88, NATIONAL CITY, CA 91951-0088
PO BOX 89, NATIONAL CITY, CA 91951-0089
PO BOX 90, NATIONAL CITY, CA 91951-0090
PO BOX 91, NATIONAL CITY, CA 91951-0091
PO BOX 92, NATIONAL CITY, CA 91951-0092
PO BOX 93, NATIONAL CITY, CA 91951-0093
PO BOX 94, NATIONAL CITY, CA 91951-0094
PO BOX 95, NATIONAL CITY, CA 91951-0095
PO BOX 96, NATIONAL CITY, CA 91951-0096
PO BOX 97, NATIONAL CITY, CA 91951-0097
PO BOX 98, NATIONAL CITY, CA 91951-0098
PO BOX 99, NATIONAL CITY, CA 91951-0099
PO BOX 100, NATIONAL CITY, CA 91951-0100
PO BOX 101, NATIONAL CITY, CA 91951-0101
PO BOX 102, NATIONAL CITY, CA 91951-0102
PO BOX 103, NATIONAL CITY, CA 91951-0103
PO BOX 104, NATIONAL CITY, CA 91951-0104
PO BOX 105, NATIONAL CITY, CA 91951-0105
PO BOX 106, NATIONAL CITY, CA 91951-0106
PO BOX 107, NATIONAL CITY, CA 91951-0107
PO BOX 108, NATIONAL CITY, CA 91951-0108
PO BOX 109, NATIONAL CITY, CA 91951-0109
PO BOX 110, NATIONAL CITY, CA 91951-0110
PO BOX 111, NATIONAL CITY, CA 91951-0111
PO BOX 112, NATIONAL CITY, CA 91951-0112
PO BOX 113, NATIONAL CITY, CA 91951-0113
PO BOX 114, NATIONAL CITY, CA 91951-0114
PO BOX 115, NATIONAL CITY, CA 91951-0115
PO BOX 116, NATIONAL CITY, CA 91951-0116
PO BOX 117, NATIONAL CITY, CA 91951-0117
PO BOX 118, NATIONAL CITY, CA 91951-0118
PO BOX 119, NATIONAL CITY, CA 91951-0119
PO BOX 120, NATIONAL CITY, CA 91951-0120
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