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, BUTLER, PA 16003-0001
PO BOX 2, BUTLER, PA 16003-0002
PO BOX 3, BUTLER, PA 16003-0003
PO BOX 4, BUTLER, PA 16003-0004
PO BOX 5, BUTLER, PA 16003-0005
PO BOX 6, BUTLER, PA 16003-0006
PO BOX 7, BUTLER, PA 16003-0007
PO BOX 8, BUTLER, PA 16003-0008
PO BOX 9, BUTLER, PA 16003-0009
PO BOX 10, BUTLER, PA 16003-0010
PO BOX 11, BUTLER, PA 16003-0011
PO BOX 12, BUTLER, PA 16003-0012
PO BOX 13, BUTLER, PA 16003-0013
PO BOX 14, BUTLER, PA 16003-0014
PO BOX 15, BUTLER, PA 16003-0015
PO BOX 16, BUTLER, PA 16003-0016
PO BOX 17, BUTLER, PA 16003-0017
PO BOX 18, BUTLER, PA 16003-0018
PO BOX 19, BUTLER, PA 16003-0019
PO BOX 20, BUTLER, PA 16003-0020
PO BOX 21, BUTLER, PA 16003-0021
PO BOX 22, BUTLER, PA 16003-0022
PO BOX 23, BUTLER, PA 16003-0023
PO BOX 24, BUTLER, PA 16003-0024
PO BOX 25, BUTLER, PA 16003-0025
PO BOX 26, BUTLER, PA 16003-0026
PO BOX 27, BUTLER, PA 16003-0027
PO BOX 28, BUTLER, PA 16003-0028
PO BOX 29, BUTLER, PA 16003-0029
PO BOX 30, BUTLER, PA 16003-0030
PO BOX 31, BUTLER, PA 16003-0031
PO BOX 32, BUTLER, PA 16003-0032
PO BOX 33, BUTLER, PA 16003-0033
PO BOX 34, BUTLER, PA 16003-0034
PO BOX 35, BUTLER, PA 16003-0035
PO BOX 36, BUTLER, PA 16003-0036
PO BOX 37, BUTLER, PA 16003-0037
PO BOX 38, BUTLER, PA 16003-0038
PO BOX 39, BUTLER, PA 16003-0039
PO BOX 40, BUTLER, PA 16003-0040
PO BOX 41, BUTLER, PA 16003-0041
PO BOX 42, BUTLER, PA 16003-0042
PO BOX 43, BUTLER, PA 16003-0043
PO BOX 44, BUTLER, PA 16003-0044
PO BOX 45, BUTLER, PA 16003-0045
PO BOX 46, BUTLER, PA 16003-0046
PO BOX 47, BUTLER, PA 16003-0047
PO BOX 48, BUTLER, PA 16003-0048
PO BOX 49, BUTLER, PA 16003-0049
PO BOX 50, BUTLER, PA 16003-0050
PO BOX 51, BUTLER, PA 16003-0051
PO BOX 52, BUTLER, PA 16003-0052
PO BOX 53, BUTLER, PA 16003-0053
PO BOX 54, BUTLER, PA 16003-0054
PO BOX 55, BUTLER, PA 16003-0055
PO BOX 56, BUTLER, PA 16003-0056
PO BOX 57, BUTLER, PA 16003-0057
PO BOX 58, BUTLER, PA 16003-0058
PO BOX 59, BUTLER, PA 16003-0059
PO BOX 60, BUTLER, PA 16003-0060
PO BOX 61, BUTLER, PA 16003-0061
PO BOX 62, BUTLER, PA 16003-0062
PO BOX 63, BUTLER, PA 16003-0063
PO BOX 64, BUTLER, PA 16003-0064
PO BOX 65, BUTLER, PA 16003-0065
PO BOX 66, BUTLER, PA 16003-0066
PO BOX 67, BUTLER, PA 16003-0067
PO BOX 68, BUTLER, PA 16003-0068
PO BOX 69, BUTLER, PA 16003-0069
PO BOX 70, BUTLER, PA 16003-0070
PO BOX 71, BUTLER, PA 16003-0071
PO BOX 72, BUTLER, PA 16003-0072
PO BOX 73, BUTLER, PA 16003-0073
PO BOX 74, BUTLER, PA 16003-0074
PO BOX 75, BUTLER, PA 16003-0075
PO BOX 76, BUTLER, PA 16003-0076
PO BOX 77, BUTLER, PA 16003-0077
PO BOX 78, BUTLER, PA 16003-0078
PO BOX 79, BUTLER, PA 16003-0079
PO BOX 80, BUTLER, PA 16003-0080
PO BOX 81, BUTLER, PA 16003-0081
PO BOX 82, BUTLER, PA 16003-0082
PO BOX 83, BUTLER, PA 16003-0083
PO BOX 84, BUTLER, PA 16003-0084
PO BOX 85, BUTLER, PA 16003-0085
PO BOX 86, BUTLER, PA 16003-0086
PO BOX 87, BUTLER, PA 16003-0087
PO BOX 88, BUTLER, PA 16003-0088
PO BOX 89, BUTLER, PA 16003-0089
PO BOX 90, BUTLER, PA 16003-0090
PO BOX 91, BUTLER, PA 16003-0091
PO BOX 92, BUTLER, PA 16003-0092
PO BOX 93, BUTLER, PA 16003-0093
PO BOX 94, BUTLER, PA 16003-0094
PO BOX 95, BUTLER, PA 16003-0095
PO BOX 96, BUTLER, PA 16003-0096
PO BOX 97, BUTLER, PA 16003-0097
PO BOX 98, BUTLER, PA 16003-0098
PO BOX 99, BUTLER, PA 16003-0099
PO BOX 100, BUTLER, PA 16003-0100
PO BOX 101, BUTLER, PA 16003-0101
PO BOX 102, BUTLER, PA 16003-0102
PO BOX 103, BUTLER, PA 16003-0103
PO BOX 104, BUTLER, PA 16003-0104
PO BOX 105, BUTLER, PA 16003-0105
PO BOX 106, BUTLER, PA 16003-0106
PO BOX 107, BUTLER, PA 16003-0107
PO BOX 108, BUTLER, PA 16003-0108
PO BOX 109, BUTLER, PA 16003-0109
PO BOX 110, BUTLER, PA 16003-0110
PO BOX 111, BUTLER, PA 16003-0111
PO BOX 112, BUTLER, PA 16003-0112
PO BOX 113, BUTLER, PA 16003-0113
PO BOX 114, BUTLER, PA 16003-0114
PO BOX 115, BUTLER, PA 16003-0115
PO BOX 116, BUTLER, PA 16003-0116
PO BOX 117, BUTLER, PA 16003-0117
PO BOX 118, BUTLER, PA 16003-0118
PO BOX 119, BUTLER, PA 16003-0119
PO BOX 120, BUTLER, PA 16003-0120
PO BOX 121, BUTLER, PA 16003-0121
PO BOX 122, BUTLER, PA 16003-0122
PO BOX 123, BUTLER, PA 16003-0123
PO BOX 124, BUTLER, PA 16003-0124
PO BOX 125, BUTLER, PA 16003-0125
PO BOX 126, BUTLER, PA 16003-0126
PO BOX 127, BUTLER, PA 16003-0127
PO BOX 128, BUTLER, PA 16003-0128
PO BOX 129, BUTLER, PA 16003-0129
PO BOX 130, BUTLER, PA 16003-0130
PO BOX 131, BUTLER, PA 16003-0131
PO BOX 132, BUTLER, PA 16003-0132
PO BOX 133, BUTLER, PA 16003-0133
PO BOX 134, BUTLER, PA 16003-0134
PO BOX 135, BUTLER, PA 16003-0135
PO BOX 136, BUTLER, PA 16003-0136
PO BOX 137, BUTLER, PA 16003-0137
PO BOX 138, BUTLER, PA 16003-0138
PO BOX 139, BUTLER, PA 16003-0139
PO BOX 140, BUTLER, PA 16003-0140
PO BOX 141, BUTLER, PA 16003-0141
PO BOX 142, BUTLER, PA 16003-0142
PO BOX 143, BUTLER, PA 16003-0143
PO BOX 144, BUTLER, PA 16003-0144
PO BOX 145, BUTLER, PA 16003-0145
PO BOX 146, BUTLER, PA 16003-0146
PO BOX 147, BUTLER, PA 16003-0147
PO BOX 148, BUTLER, PA 16003-0148
PO BOX 149, BUTLER, PA 16003-0149
PO BOX 150, BUTLER, PA 16003-0150
PO BOX 151, BUTLER, PA 16003-0151
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