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, CENTRAL VALLEY, NY 10917-0001
PO BOX 2, CENTRAL VALLEY, NY 10917-0002
PO BOX 3, CENTRAL VALLEY, NY 10917-0003
PO BOX 4, CENTRAL VALLEY, NY 10917-0004
PO BOX 5, CENTRAL VALLEY, NY 10917-0005
PO BOX 6, CENTRAL VALLEY, NY 10917-0006
PO BOX 7, CENTRAL VALLEY, NY 10917-0007
PO BOX 8, CENTRAL VALLEY, NY 10917-0008
PO BOX 9, CENTRAL VALLEY, NY 10917-0009
PO BOX 10, CENTRAL VALLEY, NY 10917-0010
PO BOX 11, CENTRAL VALLEY, NY 10917-0011
PO BOX 12, CENTRAL VALLEY, NY 10917-0012
PO BOX 13, CENTRAL VALLEY, NY 10917-0013
PO BOX 14, CENTRAL VALLEY, NY 10917-0014
PO BOX 15, CENTRAL VALLEY, NY 10917-0015
PO BOX 16, CENTRAL VALLEY, NY 10917-0016
PO BOX 17, CENTRAL VALLEY, NY 10917-0017
PO BOX 18, CENTRAL VALLEY, NY 10917-0018
PO BOX 19, CENTRAL VALLEY, NY 10917-0019
PO BOX 20, CENTRAL VALLEY, NY 10917-0020
PO BOX 21, CENTRAL VALLEY, NY 10917-0021
PO BOX 22, CENTRAL VALLEY, NY 10917-0022
PO BOX 23, CENTRAL VALLEY, NY 10917-0023
PO BOX 24, CENTRAL VALLEY, NY 10917-0024
PO BOX 25, CENTRAL VALLEY, NY 10917-0025
PO BOX 26, CENTRAL VALLEY, NY 10917-0026
PO BOX 27, CENTRAL VALLEY, NY 10917-0027
PO BOX 28, CENTRAL VALLEY, NY 10917-0028
PO BOX 29, CENTRAL VALLEY, NY 10917-0029
PO BOX 30, CENTRAL VALLEY, NY 10917-0030
PO BOX 31, CENTRAL VALLEY, NY 10917-0031
PO BOX 32, CENTRAL VALLEY, NY 10917-0032
PO BOX 33, CENTRAL VALLEY, NY 10917-0033
PO BOX 34, CENTRAL VALLEY, NY 10917-0034
PO BOX 35, CENTRAL VALLEY, NY 10917-0035
PO BOX 36, CENTRAL VALLEY, NY 10917-0036
PO BOX 37, CENTRAL VALLEY, NY 10917-0037
PO BOX 38, CENTRAL VALLEY, NY 10917-0038
PO BOX 39, CENTRAL VALLEY, NY 10917-0039
PO BOX 40, CENTRAL VALLEY, NY 10917-0040
PO BOX 41, CENTRAL VALLEY, NY 10917-0041
PO BOX 42, CENTRAL VALLEY, NY 10917-0042
PO BOX 43, CENTRAL VALLEY, NY 10917-0043
PO BOX 44, CENTRAL VALLEY, NY 10917-0044
PO BOX 45, CENTRAL VALLEY, NY 10917-0045
PO BOX 46, CENTRAL VALLEY, NY 10917-0046
PO BOX 47, CENTRAL VALLEY, NY 10917-0047
PO BOX 48, CENTRAL VALLEY, NY 10917-0048
PO BOX 49, CENTRAL VALLEY, NY 10917-0049
PO BOX 50, CENTRAL VALLEY, NY 10917-0050
PO BOX 51, CENTRAL VALLEY, NY 10917-0051
PO BOX 52, CENTRAL VALLEY, NY 10917-0052
PO BOX 53, CENTRAL VALLEY, NY 10917-0053
PO BOX 54, CENTRAL VALLEY, NY 10917-0054
PO BOX 55, CENTRAL VALLEY, NY 10917-0055
PO BOX 56, CENTRAL VALLEY, NY 10917-0056
PO BOX 57, CENTRAL VALLEY, NY 10917-0057
PO BOX 58, CENTRAL VALLEY, NY 10917-0058
PO BOX 59, CENTRAL VALLEY, NY 10917-0059
PO BOX 60, CENTRAL VALLEY, NY 10917-0060
PO BOX 61, CENTRAL VALLEY, NY 10917-0061
PO BOX 62, CENTRAL VALLEY, NY 10917-0062
PO BOX 63, CENTRAL VALLEY, NY 10917-0063
PO BOX 64, CENTRAL VALLEY, NY 10917-0064
PO BOX 65, CENTRAL VALLEY, NY 10917-0065
PO BOX 66, CENTRAL VALLEY, NY 10917-0066
PO BOX 67, CENTRAL VALLEY, NY 10917-0067
PO BOX 68, CENTRAL VALLEY, NY 10917-0068
PO BOX 69, CENTRAL VALLEY, NY 10917-0069
PO BOX 70, CENTRAL VALLEY, NY 10917-0070
PO BOX 71, CENTRAL VALLEY, NY 10917-0071
PO BOX 72, CENTRAL VALLEY, NY 10917-0072
PO BOX 73, CENTRAL VALLEY, NY 10917-0073
PO BOX 74, CENTRAL VALLEY, NY 10917-0074
PO BOX 75, CENTRAL VALLEY, NY 10917-0075
PO BOX 76, CENTRAL VALLEY, NY 10917-0076
PO BOX 77, CENTRAL VALLEY, NY 10917-0077
PO BOX 78, CENTRAL VALLEY, NY 10917-0078
PO BOX 79, CENTRAL VALLEY, NY 10917-0079
PO BOX 80, CENTRAL VALLEY, NY 10917-0080
PO BOX 81, CENTRAL VALLEY, NY 10917-0081
PO BOX 82, CENTRAL VALLEY, NY 10917-0082
PO BOX 83, CENTRAL VALLEY, NY 10917-0083
PO BOX 84, CENTRAL VALLEY, NY 10917-0084
PO BOX 85, CENTRAL VALLEY, NY 10917-0085
PO BOX 86, CENTRAL VALLEY, NY 10917-0086
PO BOX 87, CENTRAL VALLEY, NY 10917-0087
PO BOX 88, CENTRAL VALLEY, NY 10917-0088
PO BOX 89, CENTRAL VALLEY, NY 10917-0089
PO BOX 90, CENTRAL VALLEY, NY 10917-0090
PO BOX 91, CENTRAL VALLEY, NY 10917-0091
PO BOX 92, CENTRAL VALLEY, NY 10917-0092
PO BOX 93, CENTRAL VALLEY, NY 10917-0093
PO BOX 94, CENTRAL VALLEY, NY 10917-0094
PO BOX 95, CENTRAL VALLEY, NY 10917-0095
PO BOX 96, CENTRAL VALLEY, NY 10917-0096
PO BOX 97, CENTRAL VALLEY, NY 10917-0097
PO BOX 98, CENTRAL VALLEY, NY 10917-0098
PO BOX 99, CENTRAL VALLEY, NY 10917-0099
PO BOX 100, CENTRAL VALLEY, NY 10917-0100
PO BOX 101, CENTRAL VALLEY, NY 10917-0101
PO BOX 102, CENTRAL VALLEY, NY 10917-0102
PO BOX 103, CENTRAL VALLEY, NY 10917-0103
PO BOX 104, CENTRAL VALLEY, NY 10917-0104
PO BOX 105, CENTRAL VALLEY, NY 10917-0105
PO BOX 106, CENTRAL VALLEY, NY 10917-0106
PO BOX 107, CENTRAL VALLEY, NY 10917-0107
PO BOX 108, CENTRAL VALLEY, NY 10917-0108
PO BOX 109, CENTRAL VALLEY, NY 10917-0109
PO BOX 110, CENTRAL VALLEY, NY 10917-0110
PO BOX 111, CENTRAL VALLEY, NY 10917-0111
PO BOX 112, CENTRAL VALLEY, NY 10917-0112
PO BOX 113, CENTRAL VALLEY, NY 10917-0113
PO BOX 114, CENTRAL VALLEY, NY 10917-0114
PO BOX 115, CENTRAL VALLEY, NY 10917-0115
PO BOX 116, CENTRAL VALLEY, NY 10917-0116
PO BOX 117, CENTRAL VALLEY, NY 10917-0117
PO BOX 118, CENTRAL VALLEY, NY 10917-0118
PO BOX 119, CENTRAL VALLEY, NY 10917-0119
PO BOX 120, CENTRAL VALLEY, NY 10917-0120
PO BOX 121, CENTRAL VALLEY, NY 10917-0121
PO BOX 122, CENTRAL VALLEY, NY 10917-0122
PO BOX 123, CENTRAL VALLEY, NY 10917-0123
PO BOX 124, CENTRAL VALLEY, NY 10917-0124
PO BOX 125, CENTRAL VALLEY, NY 10917-0125
PO BOX 126, CENTRAL VALLEY, NY 10917-0126
PO BOX 127, CENTRAL VALLEY, NY 10917-0127
PO BOX 128, CENTRAL VALLEY, NY 10917-0128
PO BOX 129, CENTRAL VALLEY, NY 10917-0129
PO BOX 130, CENTRAL VALLEY, NY 10917-0130
PO BOX 131, CENTRAL VALLEY, NY 10917-0131
PO BOX 132, CENTRAL VALLEY, NY 10917-0132
PO BOX 133, CENTRAL VALLEY, NY 10917-0133
PO BOX 134, CENTRAL VALLEY, NY 10917-0134
PO BOX 135, CENTRAL VALLEY, NY 10917-0135
PO BOX 136, CENTRAL VALLEY, NY 10917-0136
PO BOX 137, CENTRAL VALLEY, NY 10917-0137
PO BOX 138, CENTRAL VALLEY, NY 10917-0138
PO BOX 139, CENTRAL VALLEY, NY 10917-0139
PO BOX 140, CENTRAL VALLEY, NY 10917-0140
PO BOX 141, CENTRAL VALLEY, NY 10917-0141
PO BOX 142, CENTRAL VALLEY, NY 10917-0142
PO BOX 143, CENTRAL VALLEY, NY 10917-0143
PO BOX 144, CENTRAL VALLEY, NY 10917-0144
PO BOX 145, CENTRAL VALLEY, NY 10917-0145
PO BOX 146, CENTRAL VALLEY, NY 10917-0146
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