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, EAST PITTSBURGH, PA 15112-0001
PO BOX 2, EAST PITTSBURGH, PA 15112-0002
PO BOX 3, EAST PITTSBURGH, PA 15112-0003
PO BOX 4, EAST PITTSBURGH, PA 15112-0004
PO BOX 5, EAST PITTSBURGH, PA 15112-0005
PO BOX 6, EAST PITTSBURGH, PA 15112-0006
PO BOX 7, EAST PITTSBURGH, PA 15112-0007
PO BOX 8, EAST PITTSBURGH, PA 15112-0008
PO BOX 9, EAST PITTSBURGH, PA 15112-0009
PO BOX 10, EAST PITTSBURGH, PA 15112-0010
PO BOX 11, EAST PITTSBURGH, PA 15112-0011
PO BOX 12, EAST PITTSBURGH, PA 15112-0012
PO BOX 13, EAST PITTSBURGH, PA 15112-0013
PO BOX 14, EAST PITTSBURGH, PA 15112-0014
PO BOX 15, EAST PITTSBURGH, PA 15112-0015
PO BOX 16, EAST PITTSBURGH, PA 15112-0016
PO BOX 17, EAST PITTSBURGH, PA 15112-0017
PO BOX 18, EAST PITTSBURGH, PA 15112-0018
PO BOX 19, EAST PITTSBURGH, PA 15112-0019
PO BOX 20, EAST PITTSBURGH, PA 15112-0020
PO BOX 21, EAST PITTSBURGH, PA 15112-0021
PO BOX 22, EAST PITTSBURGH, PA 15112-0022
PO BOX 23, EAST PITTSBURGH, PA 15112-0023
PO BOX 24, EAST PITTSBURGH, PA 15112-0024
PO BOX 25, EAST PITTSBURGH, PA 15112-0025
PO BOX 26, EAST PITTSBURGH, PA 15112-0026
PO BOX 27, EAST PITTSBURGH, PA 15112-0027
PO BOX 28, EAST PITTSBURGH, PA 15112-0028
PO BOX 29, EAST PITTSBURGH, PA 15112-0029
PO BOX 30, EAST PITTSBURGH, PA 15112-0030
PO BOX 31, EAST PITTSBURGH, PA 15112-0031
PO BOX 32, EAST PITTSBURGH, PA 15112-0032
PO BOX 33, EAST PITTSBURGH, PA 15112-0033
PO BOX 34, EAST PITTSBURGH, PA 15112-0034
PO BOX 35, EAST PITTSBURGH, PA 15112-0035
PO BOX 36, EAST PITTSBURGH, PA 15112-0036
PO BOX 37, EAST PITTSBURGH, PA 15112-0037
PO BOX 38, EAST PITTSBURGH, PA 15112-0038
PO BOX 39, EAST PITTSBURGH, PA 15112-0039
PO BOX 40, EAST PITTSBURGH, PA 15112-0040
PO BOX 41, EAST PITTSBURGH, PA 15112-0041
PO BOX 42, EAST PITTSBURGH, PA 15112-0042
PO BOX 43, EAST PITTSBURGH, PA 15112-0043
PO BOX 44, EAST PITTSBURGH, PA 15112-0044
PO BOX 45, EAST PITTSBURGH, PA 15112-0045
PO BOX 46, EAST PITTSBURGH, PA 15112-0046
PO BOX 47, EAST PITTSBURGH, PA 15112-0047
PO BOX 48, EAST PITTSBURGH, PA 15112-0048
PO BOX 49, EAST PITTSBURGH, PA 15112-0049
PO BOX 50, EAST PITTSBURGH, PA 15112-0050
PO BOX 51, EAST PITTSBURGH, PA 15112-0051
PO BOX 52, EAST PITTSBURGH, PA 15112-0052
PO BOX 53, EAST PITTSBURGH, PA 15112-0053
PO BOX 54, EAST PITTSBURGH, PA 15112-0054
PO BOX 55, EAST PITTSBURGH, PA 15112-0055
PO BOX 56, EAST PITTSBURGH, PA 15112-0056
PO BOX 57, EAST PITTSBURGH, PA 15112-0057
PO BOX 58, EAST PITTSBURGH, PA 15112-0058
PO BOX 59, EAST PITTSBURGH, PA 15112-0059
PO BOX 60, EAST PITTSBURGH, PA 15112-0060
PO BOX 61, EAST PITTSBURGH, PA 15112-0061
PO BOX 62, EAST PITTSBURGH, PA 15112-0062
PO BOX 63, EAST PITTSBURGH, PA 15112-0063
PO BOX 64, EAST PITTSBURGH, PA 15112-0064
PO BOX 65, EAST PITTSBURGH, PA 15112-0065
PO BOX 66, EAST PITTSBURGH, PA 15112-0066
PO BOX 67, EAST PITTSBURGH, PA 15112-0067
PO BOX 68, EAST PITTSBURGH, PA 15112-0068
PO BOX 69, EAST PITTSBURGH, PA 15112-0069
PO BOX 70, EAST PITTSBURGH, PA 15112-0070
PO BOX 71, EAST PITTSBURGH, PA 15112-0071
PO BOX 72, EAST PITTSBURGH, PA 15112-0072
PO BOX 73, EAST PITTSBURGH, PA 15112-0073
PO BOX 74, EAST PITTSBURGH, PA 15112-0074
PO BOX 75, EAST PITTSBURGH, PA 15112-0075
PO BOX 76, EAST PITTSBURGH, PA 15112-0076
PO BOX 77, EAST PITTSBURGH, PA 15112-0077
PO BOX 78, EAST PITTSBURGH, PA 15112-0078
PO BOX 79, EAST PITTSBURGH, PA 15112-0079
PO BOX 80, EAST PITTSBURGH, PA 15112-0080
PO BOX 81, EAST PITTSBURGH, PA 15112-0081
PO BOX 82, EAST PITTSBURGH, PA 15112-0082
PO BOX 83, EAST PITTSBURGH, PA 15112-0083
PO BOX 84, EAST PITTSBURGH, PA 15112-0084
PO BOX 85, EAST PITTSBURGH, PA 15112-0085
PO BOX 86, EAST PITTSBURGH, PA 15112-0086
PO BOX 87, EAST PITTSBURGH, PA 15112-0087
PO BOX 88, EAST PITTSBURGH, PA 15112-0088
PO BOX 89, EAST PITTSBURGH, PA 15112-0089
PO BOX 90, EAST PITTSBURGH, PA 15112-0090
PO BOX 91, EAST PITTSBURGH, PA 15112-0091
PO BOX 92, EAST PITTSBURGH, PA 15112-0092
PO BOX 93, EAST PITTSBURGH, PA 15112-0093
PO BOX 94, EAST PITTSBURGH, PA 15112-0094
PO BOX 95, EAST PITTSBURGH, PA 15112-0095
PO BOX 96, EAST PITTSBURGH, PA 15112-0096
PO BOX 97, EAST PITTSBURGH, PA 15112-0097
PO BOX 98, EAST PITTSBURGH, PA 15112-0098
PO BOX 99, EAST PITTSBURGH, PA 15112-0099
PO BOX 100, EAST PITTSBURGH, PA 15112-0100
PO BOX 101, EAST PITTSBURGH, PA 15112-0101
PO BOX 102, EAST PITTSBURGH, PA 15112-0102
PO BOX 103, EAST PITTSBURGH, PA 15112-0103
PO BOX 104, EAST PITTSBURGH, PA 15112-0104
PO BOX 105, EAST PITTSBURGH, PA 15112-0105
PO BOX 106, EAST PITTSBURGH, PA 15112-0106
PO BOX 107, EAST PITTSBURGH, PA 15112-0107
PO BOX 108, EAST PITTSBURGH, PA 15112-0108
PO BOX 109, EAST PITTSBURGH, PA 15112-0109
PO BOX 110, EAST PITTSBURGH, PA 15112-0110
PO BOX 111, EAST PITTSBURGH, PA 15112-0111
PO BOX 112, EAST PITTSBURGH, PA 15112-0112
PO BOX 113, EAST PITTSBURGH, PA 15112-0113
PO BOX 114, EAST PITTSBURGH, PA 15112-0114
PO BOX 115, EAST PITTSBURGH, PA 15112-0115
PO BOX 116, EAST PITTSBURGH, PA 15112-0116
PO BOX 117, EAST PITTSBURGH, PA 15112-0117
PO BOX 118, EAST PITTSBURGH, PA 15112-0118
PO BOX 119, EAST PITTSBURGH, PA 15112-0119
PO BOX 120, EAST PITTSBURGH, PA 15112-0120
PO BOX 121, EAST PITTSBURGH, PA 15112-0121
PO BOX 122, EAST PITTSBURGH, PA 15112-0122
PO BOX 123, EAST PITTSBURGH, PA 15112-0123
PO BOX 124, EAST PITTSBURGH, PA 15112-0124
PO BOX 125, EAST PITTSBURGH, PA 15112-0125
PO BOX 126, EAST PITTSBURGH, PA 15112-0126
PO BOX 127, EAST PITTSBURGH, PA 15112-0127
PO BOX 128, EAST PITTSBURGH, PA 15112-0128
PO BOX 129, EAST PITTSBURGH, PA 15112-0129
PO BOX 130, EAST PITTSBURGH, PA 15112-0130
PO BOX 131, EAST PITTSBURGH, PA 15112-0131
PO BOX 132, EAST PITTSBURGH, PA 15112-0132
PO BOX 133, EAST PITTSBURGH, PA 15112-0133
PO BOX 134, EAST PITTSBURGH, PA 15112-0134
PO BOX 135, EAST PITTSBURGH, PA 15112-0135
PO BOX 136, EAST PITTSBURGH, PA 15112-0136
PO BOX 137, EAST PITTSBURGH, PA 15112-0137
PO BOX 138, EAST PITTSBURGH, PA 15112-0138
PO BOX 139, EAST PITTSBURGH, PA 15112-0139
PO BOX 140, EAST PITTSBURGH, PA 15112-0140
PO BOX 141, EAST PITTSBURGH, PA 15112-0141
PO BOX 142, EAST PITTSBURGH, PA 15112-0142
PO BOX 143, EAST PITTSBURGH, PA 15112-0143
PO BOX 144, EAST PITTSBURGH, PA 15112-0144
PO BOX 145, EAST PITTSBURGH, PA 15112-0145
PO BOX 146, EAST PITTSBURGH, PA 15112-0146
PO BOX 147, EAST PITTSBURGH, PA 15112-0147
PO BOX 148, EAST PITTSBURGH, PA 15112-0148
PO BOX 149, EAST PITTSBURGH, PA 15112-0149
PO BOX 150, EAST PITTSBURGH, PA 15112-0150
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