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, BRIDGEPORT, CA 93517-0001
PO BOX 2, BRIDGEPORT, CA 93517-0002
PO BOX 3, BRIDGEPORT, CA 93517-0003
PO BOX 4, BRIDGEPORT, CA 93517-0004
PO BOX 5, BRIDGEPORT, CA 93517-0005
PO BOX 6, BRIDGEPORT, CA 93517-0006
PO BOX 7, BRIDGEPORT, CA 93517-0007
PO BOX 8, BRIDGEPORT, CA 93517-0008
PO BOX 9, BRIDGEPORT, CA 93517-0009
PO BOX 10, BRIDGEPORT, CA 93517-0010
PO BOX 11, BRIDGEPORT, CA 93517-0011
PO BOX 12, BRIDGEPORT, CA 93517-0012
PO BOX 13, BRIDGEPORT, CA 93517-0013
PO BOX 14, BRIDGEPORT, CA 93517-0014
PO BOX 15, BRIDGEPORT, CA 93517-0015
PO BOX 16, BRIDGEPORT, CA 93517-0016
PO BOX 17, BRIDGEPORT, CA 93517-0017
PO BOX 18, BRIDGEPORT, CA 93517-0018
PO BOX 19, BRIDGEPORT, CA 93517-0019
PO BOX 20, BRIDGEPORT, CA 93517-0020
PO BOX 21, BRIDGEPORT, CA 93517-0021
PO BOX 22, BRIDGEPORT, CA 93517-0022
PO BOX 23, BRIDGEPORT, CA 93517-0023
PO BOX 24, BRIDGEPORT, CA 93517-0024
PO BOX 25, BRIDGEPORT, CA 93517-0025
PO BOX 26, BRIDGEPORT, CA 93517-0026
PO BOX 27, BRIDGEPORT, CA 93517-0027
PO BOX 28, BRIDGEPORT, CA 93517-0028
PO BOX 29, BRIDGEPORT, CA 93517-0029
PO BOX 30, BRIDGEPORT, CA 93517-0030
PO BOX 31, BRIDGEPORT, CA 93517-0031
PO BOX 32, BRIDGEPORT, CA 93517-0032
PO BOX 33, BRIDGEPORT, CA 93517-0033
PO BOX 34, BRIDGEPORT, CA 93517-0034
PO BOX 35, BRIDGEPORT, CA 93517-0035
PO BOX 36, BRIDGEPORT, CA 93517-0036
PO BOX 37, BRIDGEPORT, CA 93517-0037
PO BOX 38, BRIDGEPORT, CA 93517-0038
PO BOX 39, BRIDGEPORT, CA 93517-0039
PO BOX 40, BRIDGEPORT, CA 93517-0040
PO BOX 41, BRIDGEPORT, CA 93517-0041
PO BOX 42, BRIDGEPORT, CA 93517-0042
PO BOX 43, BRIDGEPORT, CA 93517-0043
PO BOX 44, BRIDGEPORT, CA 93517-0044
PO BOX 45, BRIDGEPORT, CA 93517-0045
PO BOX 46, BRIDGEPORT, CA 93517-0046
PO BOX 47, BRIDGEPORT, CA 93517-0047
PO BOX 48, BRIDGEPORT, CA 93517-0048
PO BOX 49, BRIDGEPORT, CA 93517-0049
PO BOX 50, BRIDGEPORT, CA 93517-0050
PO BOX 51, BRIDGEPORT, CA 93517-0051
PO BOX 52, BRIDGEPORT, CA 93517-0052
PO BOX 53, BRIDGEPORT, CA 93517-0053
PO BOX 54, BRIDGEPORT, CA 93517-0054
PO BOX 55, BRIDGEPORT, CA 93517-0055
PO BOX 56, BRIDGEPORT, CA 93517-0056
PO BOX 57, BRIDGEPORT, CA 93517-0057
PO BOX 58, BRIDGEPORT, CA 93517-0058
PO BOX 59, BRIDGEPORT, CA 93517-0059
PO BOX 60, BRIDGEPORT, CA 93517-0060
PO BOX 61, BRIDGEPORT, CA 93517-0061
PO BOX 62, BRIDGEPORT, CA 93517-0062
PO BOX 63, BRIDGEPORT, CA 93517-0063
PO BOX 64, BRIDGEPORT, CA 93517-0064
PO BOX 65, BRIDGEPORT, CA 93517-0065
PO BOX 66, BRIDGEPORT, CA 93517-0066
PO BOX 67, BRIDGEPORT, CA 93517-0067
PO BOX 68, BRIDGEPORT, CA 93517-0068
PO BOX 69, BRIDGEPORT, CA 93517-0069
PO BOX 70, BRIDGEPORT, CA 93517-0070
PO BOX 71, BRIDGEPORT, CA 93517-0071
PO BOX 72, BRIDGEPORT, CA 93517-0072
PO BOX 73, BRIDGEPORT, CA 93517-0073
PO BOX 74, BRIDGEPORT, CA 93517-0074
PO BOX 75, BRIDGEPORT, CA 93517-0075
PO BOX 76, BRIDGEPORT, CA 93517-0076
PO BOX 77, BRIDGEPORT, CA 93517-0077
PO BOX 78, BRIDGEPORT, CA 93517-0078
PO BOX 79, BRIDGEPORT, CA 93517-0079
PO BOX 80, BRIDGEPORT, CA 93517-0080
PO BOX 81, BRIDGEPORT, CA 93517-0081
PO BOX 82, BRIDGEPORT, CA 93517-0082
PO BOX 83, BRIDGEPORT, CA 93517-0083
PO BOX 84, BRIDGEPORT, CA 93517-0084
PO BOX 85, BRIDGEPORT, CA 93517-0085
PO BOX 86, BRIDGEPORT, CA 93517-0086
PO BOX 87, BRIDGEPORT, CA 93517-0087
PO BOX 88, BRIDGEPORT, CA 93517-0088
PO BOX 89, BRIDGEPORT, CA 93517-0089
PO BOX 90, BRIDGEPORT, CA 93517-0090
PO BOX 91, BRIDGEPORT, CA 93517-0091
PO BOX 92, BRIDGEPORT, CA 93517-0092
PO BOX 93, BRIDGEPORT, CA 93517-0093
PO BOX 94, BRIDGEPORT, CA 93517-0094
PO BOX 95, BRIDGEPORT, CA 93517-0095
PO BOX 96, BRIDGEPORT, CA 93517-0096
PO BOX 97, BRIDGEPORT, CA 93517-0097
PO BOX 98, BRIDGEPORT, CA 93517-0098
PO BOX 99, BRIDGEPORT, CA 93517-0099
PO BOX 100, BRIDGEPORT, CA 93517-0100
PO BOX 101, BRIDGEPORT, CA 93517-0101
PO BOX 102, BRIDGEPORT, CA 93517-0102
PO BOX 103, BRIDGEPORT, CA 93517-0103
PO BOX 104, BRIDGEPORT, CA 93517-0104
PO BOX 105, BRIDGEPORT, CA 93517-0105
PO BOX 106, BRIDGEPORT, CA 93517-0106
PO BOX 107, BRIDGEPORT, CA 93517-0107
PO BOX 108, BRIDGEPORT, CA 93517-0108
PO BOX 109, BRIDGEPORT, CA 93517-0109
PO BOX 110, BRIDGEPORT, CA 93517-0110
PO BOX 111, BRIDGEPORT, CA 93517-0111
PO BOX 112, BRIDGEPORT, CA 93517-0112
PO BOX 113, BRIDGEPORT, CA 93517-0113
PO BOX 114, BRIDGEPORT, CA 93517-0114
PO BOX 115, BRIDGEPORT, CA 93517-0115
PO BOX 116, BRIDGEPORT, CA 93517-0116
PO BOX 117, BRIDGEPORT, CA 93517-0117
PO BOX 118, BRIDGEPORT, CA 93517-0118
PO BOX 119, BRIDGEPORT, CA 93517-0119
PO BOX 120, BRIDGEPORT, CA 93517-0120
PO BOX 121, BRIDGEPORT, CA 93517-0121
PO BOX 122, BRIDGEPORT, CA 93517-0122
PO BOX 123, BRIDGEPORT, CA 93517-0123
PO BOX 124, BRIDGEPORT, CA 93517-0124
PO BOX 125, BRIDGEPORT, CA 93517-0125
PO BOX 126, BRIDGEPORT, CA 93517-0126
PO BOX 127, BRIDGEPORT, CA 93517-0127
PO BOX 128, BRIDGEPORT, CA 93517-0128
PO BOX 129, BRIDGEPORT, CA 93517-0129
PO BOX 130, BRIDGEPORT, CA 93517-0130
PO BOX 131, BRIDGEPORT, CA 93517-0131
PO BOX 132, BRIDGEPORT, CA 93517-0132
PO BOX 133, BRIDGEPORT, CA 93517-0133
PO BOX 134, BRIDGEPORT, CA 93517-0134
PO BOX 135, BRIDGEPORT, CA 93517-0135
PO BOX 136, BRIDGEPORT, CA 93517-0136
PO BOX 137, BRIDGEPORT, CA 93517-0137
PO BOX 138, BRIDGEPORT, CA 93517-0138
PO BOX 139, BRIDGEPORT, CA 93517-0139
PO BOX 140, BRIDGEPORT, CA 93517-0140
PO BOX 141, BRIDGEPORT, CA 93517-0141
PO BOX 142, BRIDGEPORT, CA 93517-0142
PO BOX 143, BRIDGEPORT, CA 93517-0143
PO BOX 144, BRIDGEPORT, CA 93517-0144
PO BOX 145, BRIDGEPORT, CA 93517-0145
PO BOX 146, BRIDGEPORT, CA 93517-0146
PO BOX 147, BRIDGEPORT, CA 93517-0147
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