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, PORTERVILLE, CA 93258-0001
PO BOX 2, PORTERVILLE, CA 93258-0002
PO BOX 3, PORTERVILLE, CA 93258-0003
PO BOX 4, PORTERVILLE, CA 93258-0004
PO BOX 5, PORTERVILLE, CA 93258-0005
PO BOX 6, PORTERVILLE, CA 93258-0006
PO BOX 7, PORTERVILLE, CA 93258-0007
PO BOX 8, PORTERVILLE, CA 93258-0008
PO BOX 9, PORTERVILLE, CA 93258-0009
PO BOX 10, PORTERVILLE, CA 93258-0010
PO BOX 11, PORTERVILLE, CA 93258-0011
PO BOX 12, PORTERVILLE, CA 93258-0012
PO BOX 13, PORTERVILLE, CA 93258-0013
PO BOX 14, PORTERVILLE, CA 93258-0014
PO BOX 15, PORTERVILLE, CA 93258-0015
PO BOX 16, PORTERVILLE, CA 93258-0016
PO BOX 17, PORTERVILLE, CA 93258-0017
PO BOX 18, PORTERVILLE, CA 93258-0018
PO BOX 19, PORTERVILLE, CA 93258-0019
PO BOX 20, PORTERVILLE, CA 93258-0020
PO BOX 21, PORTERVILLE, CA 93258-0021
PO BOX 22, PORTERVILLE, CA 93258-0022
PO BOX 23, PORTERVILLE, CA 93258-0023
PO BOX 24, PORTERVILLE, CA 93258-0024
PO BOX 25, PORTERVILLE, CA 93258-0025
PO BOX 26, PORTERVILLE, CA 93258-0026
PO BOX 27, PORTERVILLE, CA 93258-0027
PO BOX 28, PORTERVILLE, CA 93258-0028
PO BOX 29, PORTERVILLE, CA 93258-0029
PO BOX 30, PORTERVILLE, CA 93258-0030
PO BOX 31, PORTERVILLE, CA 93258-0031
PO BOX 32, PORTERVILLE, CA 93258-0032
PO BOX 33, PORTERVILLE, CA 93258-0033
PO BOX 34, PORTERVILLE, CA 93258-0034
PO BOX 35, PORTERVILLE, CA 93258-0035
PO BOX 36, PORTERVILLE, CA 93258-0036
PO BOX 37, PORTERVILLE, CA 93258-0037
PO BOX 38, PORTERVILLE, CA 93258-0038
PO BOX 39, PORTERVILLE, CA 93258-0039
PO BOX 40, PORTERVILLE, CA 93258-0040
PO BOX 41, PORTERVILLE, CA 93258-0041
PO BOX 42, PORTERVILLE, CA 93258-0042
PO BOX 43, PORTERVILLE, CA 93258-0043
PO BOX 44, PORTERVILLE, CA 93258-0044
PO BOX 45, PORTERVILLE, CA 93258-0045
PO BOX 46, PORTERVILLE, CA 93258-0046
PO BOX 47, PORTERVILLE, CA 93258-0047
PO BOX 48, PORTERVILLE, CA 93258-0048
PO BOX 49, PORTERVILLE, CA 93258-0049
PO BOX 50, PORTERVILLE, CA 93258-0050
PO BOX 51, PORTERVILLE, CA 93258-0051
PO BOX 52, PORTERVILLE, CA 93258-0052
PO BOX 53, PORTERVILLE, CA 93258-0053
PO BOX 54, PORTERVILLE, CA 93258-0054
PO BOX 55, PORTERVILLE, CA 93258-0055
PO BOX 56, PORTERVILLE, CA 93258-0056
PO BOX 57, PORTERVILLE, CA 93258-0057
PO BOX 58, PORTERVILLE, CA 93258-0058
PO BOX 59, PORTERVILLE, CA 93258-0059
PO BOX 60, PORTERVILLE, CA 93258-0060
PO BOX 61, PORTERVILLE, CA 93258-0061
PO BOX 62, PORTERVILLE, CA 93258-0062
PO BOX 63, PORTERVILLE, CA 93258-0063
PO BOX 64, PORTERVILLE, CA 93258-0064
PO BOX 65, PORTERVILLE, CA 93258-0065
PO BOX 66, PORTERVILLE, CA 93258-0066
PO BOX 67, PORTERVILLE, CA 93258-0067
PO BOX 68, PORTERVILLE, CA 93258-0068
PO BOX 69, PORTERVILLE, CA 93258-0069
PO BOX 70, PORTERVILLE, CA 93258-0070
PO BOX 71, PORTERVILLE, CA 93258-0071
PO BOX 72, PORTERVILLE, CA 93258-0072
PO BOX 73, PORTERVILLE, CA 93258-0073
PO BOX 74, PORTERVILLE, CA 93258-0074
PO BOX 75, PORTERVILLE, CA 93258-0075
PO BOX 76, PORTERVILLE, CA 93258-0076
PO BOX 77, PORTERVILLE, CA 93258-0077
PO BOX 78, PORTERVILLE, CA 93258-0078
PO BOX 79, PORTERVILLE, CA 93258-0079
PO BOX 80, PORTERVILLE, CA 93258-0080
PO BOX 81, PORTERVILLE, CA 93258-0081
PO BOX 82, PORTERVILLE, CA 93258-0082
PO BOX 83, PORTERVILLE, CA 93258-0083
PO BOX 84, PORTERVILLE, CA 93258-0084
PO BOX 85, PORTERVILLE, CA 93258-0085
PO BOX 86, PORTERVILLE, CA 93258-0086
PO BOX 87, PORTERVILLE, CA 93258-0087
PO BOX 88, PORTERVILLE, CA 93258-0088
PO BOX 89, PORTERVILLE, CA 93258-0089
PO BOX 90, PORTERVILLE, CA 93258-0090
PO BOX 91, PORTERVILLE, CA 93258-0091
PO BOX 92, PORTERVILLE, CA 93258-0092
PO BOX 93, PORTERVILLE, CA 93258-0093
PO BOX 94, PORTERVILLE, CA 93258-0094
PO BOX 95, PORTERVILLE, CA 93258-0095
PO BOX 96, PORTERVILLE, CA 93258-0096
PO BOX 97, PORTERVILLE, CA 93258-0097
PO BOX 98, PORTERVILLE, CA 93258-0098
PO BOX 99, PORTERVILLE, CA 93258-0099
PO BOX 100, PORTERVILLE, CA 93258-0100
PO BOX 101, PORTERVILLE, CA 93258-0101
PO BOX 102, PORTERVILLE, CA 93258-0102
PO BOX 103, PORTERVILLE, CA 93258-0103
PO BOX 104, PORTERVILLE, CA 93258-0104
PO BOX 105, PORTERVILLE, CA 93258-0105
PO BOX 106, PORTERVILLE, CA 93258-0106
PO BOX 107, PORTERVILLE, CA 93258-0107
PO BOX 108, PORTERVILLE, CA 93258-0108
PO BOX 109, PORTERVILLE, CA 93258-0109
PO BOX 110, PORTERVILLE, CA 93258-0110
PO BOX 111, PORTERVILLE, CA 93258-0111
PO BOX 112, PORTERVILLE, CA 93258-0112
PO BOX 113, PORTERVILLE, CA 93258-0113
PO BOX 114, PORTERVILLE, CA 93258-0114
PO BOX 115, PORTERVILLE, CA 93258-0115
PO BOX 116, PORTERVILLE, CA 93258-0116
PO BOX 117, PORTERVILLE, CA 93258-0117
PO BOX 118, PORTERVILLE, CA 93258-0118
PO BOX 119, PORTERVILLE, CA 93258-0119
PO BOX 120, PORTERVILLE, CA 93258-0120
PO BOX 121, PORTERVILLE, CA 93258-0121
PO BOX 122, PORTERVILLE, CA 93258-0122
PO BOX 123, PORTERVILLE, CA 93258-0123
PO BOX 124, PORTERVILLE, CA 93258-0124
PO BOX 125, PORTERVILLE, CA 93258-0125
PO BOX 126, PORTERVILLE, CA 93258-0126
PO BOX 127, PORTERVILLE, CA 93258-0127
PO BOX 128, PORTERVILLE, CA 93258-0128
PO BOX 129, PORTERVILLE, CA 93258-0129
PO BOX 130, PORTERVILLE, CA 93258-0130
PO BOX 131, PORTERVILLE, CA 93258-0131
PO BOX 132, PORTERVILLE, CA 93258-0132
PO BOX 133, PORTERVILLE, CA 93258-0133
PO BOX 134, PORTERVILLE, CA 93258-0134
PO BOX 135, PORTERVILLE, CA 93258-0135
PO BOX 136, PORTERVILLE, CA 93258-0136
PO BOX 137, PORTERVILLE, CA 93258-0137
PO BOX 138, PORTERVILLE, CA 93258-0138
PO BOX 139, PORTERVILLE, CA 93258-0139
PO BOX 140, PORTERVILLE, CA 93258-0140
PO BOX 141, PORTERVILLE, CA 93258-0141
PO BOX 142, PORTERVILLE, CA 93258-0142
PO BOX 143, PORTERVILLE, CA 93258-0143
PO BOX 144, PORTERVILLE, CA 93258-0144
PO BOX 145, PORTERVILLE, CA 93258-0145
PO BOX 146, PORTERVILLE, CA 93258-0146
PO BOX 147, PORTERVILLE, CA 93258-0147
PO BOX 148, PORTERVILLE, CA 93258-0148
PO BOX 149, PORTERVILLE, CA 93258-0149
PO BOX 150, PORTERVILLE, CA 93258-0150
PO BOX 151, PORTERVILLE, CA 93258-0151
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