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, WEST SPRINGFIELD, MA 01090-0001
PO BOX 2, WEST SPRINGFIELD, MA 01090-0002
PO BOX 3, WEST SPRINGFIELD, MA 01090-0003
PO BOX 4, WEST SPRINGFIELD, MA 01090-0004
PO BOX 5, WEST SPRINGFIELD, MA 01090-0005
PO BOX 6, WEST SPRINGFIELD, MA 01090-0006
PO BOX 7, WEST SPRINGFIELD, MA 01090-0007
PO BOX 8, WEST SPRINGFIELD, MA 01090-0008
PO BOX 9, WEST SPRINGFIELD, MA 01090-0009
PO BOX 10, WEST SPRINGFIELD, MA 01090-0010
PO BOX 11, WEST SPRINGFIELD, MA 01090-0011
PO BOX 12, WEST SPRINGFIELD, MA 01090-0012
PO BOX 13, WEST SPRINGFIELD, MA 01090-0013
PO BOX 14, WEST SPRINGFIELD, MA 01090-0014
PO BOX 15, WEST SPRINGFIELD, MA 01090-0015
PO BOX 16, WEST SPRINGFIELD, MA 01090-0016
PO BOX 17, WEST SPRINGFIELD, MA 01090-0017
PO BOX 18, WEST SPRINGFIELD, MA 01090-0018
PO BOX 19, WEST SPRINGFIELD, MA 01090-0019
PO BOX 20, WEST SPRINGFIELD, MA 01090-0020
PO BOX 21, WEST SPRINGFIELD, MA 01090-0021
PO BOX 22, WEST SPRINGFIELD, MA 01090-0022
PO BOX 23, WEST SPRINGFIELD, MA 01090-0023
PO BOX 24, WEST SPRINGFIELD, MA 01090-0024
PO BOX 25, WEST SPRINGFIELD, MA 01090-0025
PO BOX 26, WEST SPRINGFIELD, MA 01090-0026
PO BOX 27, WEST SPRINGFIELD, MA 01090-0027
PO BOX 28, WEST SPRINGFIELD, MA 01090-0028
PO BOX 29, WEST SPRINGFIELD, MA 01090-0029
PO BOX 30, WEST SPRINGFIELD, MA 01090-0030
PO BOX 31, WEST SPRINGFIELD, MA 01090-0031
PO BOX 32, WEST SPRINGFIELD, MA 01090-0032
PO BOX 33, WEST SPRINGFIELD, MA 01090-0033
PO BOX 34, WEST SPRINGFIELD, MA 01090-0034
PO BOX 35, WEST SPRINGFIELD, MA 01090-0035
PO BOX 36, WEST SPRINGFIELD, MA 01090-0036
PO BOX 37, WEST SPRINGFIELD, MA 01090-0037
PO BOX 38, WEST SPRINGFIELD, MA 01090-0038
PO BOX 39, WEST SPRINGFIELD, MA 01090-0039
PO BOX 40, WEST SPRINGFIELD, MA 01090-0040
PO BOX 41, WEST SPRINGFIELD, MA 01090-0041
PO BOX 42, WEST SPRINGFIELD, MA 01090-0042
PO BOX 43, WEST SPRINGFIELD, MA 01090-0043
PO BOX 44, WEST SPRINGFIELD, MA 01090-0044
PO BOX 45, WEST SPRINGFIELD, MA 01090-0045
PO BOX 46, WEST SPRINGFIELD, MA 01090-0046
PO BOX 47, WEST SPRINGFIELD, MA 01090-0047
PO BOX 48, WEST SPRINGFIELD, MA 01090-0048
PO BOX 49, WEST SPRINGFIELD, MA 01090-0049
PO BOX 50, WEST SPRINGFIELD, MA 01090-0050
PO BOX 51, WEST SPRINGFIELD, MA 01090-0051
PO BOX 52, WEST SPRINGFIELD, MA 01090-0052
PO BOX 53, WEST SPRINGFIELD, MA 01090-0053
PO BOX 54, WEST SPRINGFIELD, MA 01090-0054
PO BOX 55, WEST SPRINGFIELD, MA 01090-0055
PO BOX 56, WEST SPRINGFIELD, MA 01090-0056
PO BOX 57, WEST SPRINGFIELD, MA 01090-0057
PO BOX 58, WEST SPRINGFIELD, MA 01090-0058
PO BOX 59, WEST SPRINGFIELD, MA 01090-0059
PO BOX 60, WEST SPRINGFIELD, MA 01090-0060
PO BOX 61, WEST SPRINGFIELD, MA 01090-0061
PO BOX 62, WEST SPRINGFIELD, MA 01090-0062
PO BOX 63, WEST SPRINGFIELD, MA 01090-0063
PO BOX 64, WEST SPRINGFIELD, MA 01090-0064
PO BOX 65, WEST SPRINGFIELD, MA 01090-0065
PO BOX 66, WEST SPRINGFIELD, MA 01090-0066
PO BOX 67, WEST SPRINGFIELD, MA 01090-0067
PO BOX 68, WEST SPRINGFIELD, MA 01090-0068
PO BOX 69, WEST SPRINGFIELD, MA 01090-0069
PO BOX 70, WEST SPRINGFIELD, MA 01090-0070
PO BOX 71, WEST SPRINGFIELD, MA 01090-0071
PO BOX 72, WEST SPRINGFIELD, MA 01090-0072
PO BOX 73, WEST SPRINGFIELD, MA 01090-0073
PO BOX 74, WEST SPRINGFIELD, MA 01090-0074
PO BOX 75, WEST SPRINGFIELD, MA 01090-0075
PO BOX 76, WEST SPRINGFIELD, MA 01090-0076
PO BOX 77, WEST SPRINGFIELD, MA 01090-0077
PO BOX 78, WEST SPRINGFIELD, MA 01090-0078
PO BOX 79, WEST SPRINGFIELD, MA 01090-0079
PO BOX 80, WEST SPRINGFIELD, MA 01090-0080
PO BOX 81, WEST SPRINGFIELD, MA 01090-0081
PO BOX 82, WEST SPRINGFIELD, MA 01090-0082
PO BOX 83, WEST SPRINGFIELD, MA 01090-0083
PO BOX 84, WEST SPRINGFIELD, MA 01090-0084
PO BOX 85, WEST SPRINGFIELD, MA 01090-0085
PO BOX 86, WEST SPRINGFIELD, MA 01090-0086
PO BOX 87, WEST SPRINGFIELD, MA 01090-0087
PO BOX 88, WEST SPRINGFIELD, MA 01090-0088
PO BOX 89, WEST SPRINGFIELD, MA 01090-0089
PO BOX 90, WEST SPRINGFIELD, MA 01090-0090
PO BOX 91, WEST SPRINGFIELD, MA 01090-0091
PO BOX 92, WEST SPRINGFIELD, MA 01090-0092
PO BOX 93, WEST SPRINGFIELD, MA 01090-0093
PO BOX 94, WEST SPRINGFIELD, MA 01090-0094
PO BOX 95, WEST SPRINGFIELD, MA 01090-0095
PO BOX 96, WEST SPRINGFIELD, MA 01090-0096
PO BOX 97, WEST SPRINGFIELD, MA 01090-0097
PO BOX 98, WEST SPRINGFIELD, MA 01090-0098
PO BOX 99, WEST SPRINGFIELD, MA 01090-0099
PO BOX 100, WEST SPRINGFIELD, MA 01090-0100
PO BOX 101, WEST SPRINGFIELD, MA 01090-0101
PO BOX 102, WEST SPRINGFIELD, MA 01090-0102
PO BOX 103, WEST SPRINGFIELD, MA 01090-0103
PO BOX 104, WEST SPRINGFIELD, MA 01090-0104
PO BOX 105, WEST SPRINGFIELD, MA 01090-0105
PO BOX 106, WEST SPRINGFIELD, MA 01090-0106
PO BOX 107, WEST SPRINGFIELD, MA 01090-0107
PO BOX 108, WEST SPRINGFIELD, MA 01090-0108
PO BOX 109, WEST SPRINGFIELD, MA 01090-0109
PO BOX 110, WEST SPRINGFIELD, MA 01090-0110
PO BOX 111, WEST SPRINGFIELD, MA 01090-0111
PO BOX 112, WEST SPRINGFIELD, MA 01090-0112
PO BOX 113, WEST SPRINGFIELD, MA 01090-0113
PO BOX 114, WEST SPRINGFIELD, MA 01090-0114
PO BOX 115, WEST SPRINGFIELD, MA 01090-0115
PO BOX 116, WEST SPRINGFIELD, MA 01090-0116
PO BOX 117, WEST SPRINGFIELD, MA 01090-0117
PO BOX 118, WEST SPRINGFIELD, MA 01090-0118
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