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, MADISON, PA 15663-0001
PO BOX 2, MADISON, PA 15663-0002
PO BOX 3, MADISON, PA 15663-0003
PO BOX 4, MADISON, PA 15663-0004
PO BOX 5, MADISON, PA 15663-0005
PO BOX 6, MADISON, PA 15663-0006
PO BOX 7, MADISON, PA 15663-0007
PO BOX 8, MADISON, PA 15663-0008
PO BOX 9, MADISON, PA 15663-0009
PO BOX 10, MADISON, PA 15663-0010
PO BOX 11, MADISON, PA 15663-0011
PO BOX 12, MADISON, PA 15663-0012
PO BOX 13, MADISON, PA 15663-0013
PO BOX 14, MADISON, PA 15663-0014
PO BOX 15, MADISON, PA 15663-0015
PO BOX 16, MADISON, PA 15663-0016
PO BOX 17, MADISON, PA 15663-0017
PO BOX 18, MADISON, PA 15663-0018
PO BOX 19, MADISON, PA 15663-0019
PO BOX 20, MADISON, PA 15663-0020
PO BOX 21, MADISON, PA 15663-0021
PO BOX 22, MADISON, PA 15663-0022
PO BOX 23, MADISON, PA 15663-0023
PO BOX 24, MADISON, PA 15663-0024
PO BOX 25, MADISON, PA 15663-0025
PO BOX 26, MADISON, PA 15663-0026
PO BOX 27, MADISON, PA 15663-0027
PO BOX 28, MADISON, PA 15663-0028
PO BOX 29, MADISON, PA 15663-0029
PO BOX 30, MADISON, PA 15663-0030
PO BOX 31, MADISON, PA 15663-0031
PO BOX 32, MADISON, PA 15663-0032
PO BOX 33, MADISON, PA 15663-0033
PO BOX 34, MADISON, PA 15663-0034
PO BOX 35, MADISON, PA 15663-0035
PO BOX 36, MADISON, PA 15663-0036
PO BOX 37, MADISON, PA 15663-0037
PO BOX 38, MADISON, PA 15663-0038
PO BOX 39, MADISON, PA 15663-0039
PO BOX 40, MADISON, PA 15663-0040
PO BOX 41, MADISON, PA 15663-0041
PO BOX 42, MADISON, PA 15663-0042
PO BOX 43, MADISON, PA 15663-0043
PO BOX 44, MADISON, PA 15663-0044
PO BOX 45, MADISON, PA 15663-0045
PO BOX 46, MADISON, PA 15663-0046
PO BOX 47, MADISON, PA 15663-0047
PO BOX 48, MADISON, PA 15663-0048
PO BOX 49, MADISON, PA 15663-0049
PO BOX 50, MADISON, PA 15663-0050
PO BOX 51, MADISON, PA 15663-0051
PO BOX 52, MADISON, PA 15663-0052
PO BOX 53, MADISON, PA 15663-0053
PO BOX 54, MADISON, PA 15663-0054
PO BOX 55, MADISON, PA 15663-0055
PO BOX 56, MADISON, PA 15663-0056
PO BOX 57, MADISON, PA 15663-0057
PO BOX 58, MADISON, PA 15663-0058
PO BOX 59, MADISON, PA 15663-0059
PO BOX 60, MADISON, PA 15663-0060
PO BOX 61, MADISON, PA 15663-0061
PO BOX 62, MADISON, PA 15663-0062
PO BOX 63, MADISON, PA 15663-0063
PO BOX 64, MADISON, PA 15663-0064
PO BOX 65, MADISON, PA 15663-0065
PO BOX 66, MADISON, PA 15663-0066
PO BOX 67, MADISON, PA 15663-0067
PO BOX 68, MADISON, PA 15663-0068
PO BOX 69, MADISON, PA 15663-0069
PO BOX 70, MADISON, PA 15663-0070
PO BOX 71, MADISON, PA 15663-0071
PO BOX 72, MADISON, PA 15663-0072
PO BOX 73, MADISON, PA 15663-0073
PO BOX 74, MADISON, PA 15663-0074
PO BOX 75, MADISON, PA 15663-0075
PO BOX 76, MADISON, PA 15663-0076
PO BOX 77, MADISON, PA 15663-0077
PO BOX 78, MADISON, PA 15663-0078
PO BOX 79, MADISON, PA 15663-0079
PO BOX 80, MADISON, PA 15663-0080
PO BOX 81, MADISON, PA 15663-0081
PO BOX 82, MADISON, PA 15663-0082
PO BOX 83, MADISON, PA 15663-0083
PO BOX 84, MADISON, PA 15663-0084
PO BOX 85, MADISON, PA 15663-0085
PO BOX 86, MADISON, PA 15663-0086
PO BOX 87, MADISON, PA 15663-0087
PO BOX 88, MADISON, PA 15663-0088
PO BOX 89, MADISON, PA 15663-0089
PO BOX 90, MADISON, PA 15663-0090
PO BOX 91, MADISON, PA 15663-0091
PO BOX 92, MADISON, PA 15663-0092
PO BOX 93, MADISON, PA 15663-0093
PO BOX 94, MADISON, PA 15663-0094
PO BOX 95, MADISON, PA 15663-0095
PO BOX 96, MADISON, PA 15663-0096
PO BOX 97, MADISON, PA 15663-0097
PO BOX 98, MADISON, PA 15663-0098
PO BOX 99, MADISON, PA 15663-0099
PO BOX 100, MADISON, PA 15663-0100
PO BOX 101, MADISON, PA 15663-0101
PO BOX 102, MADISON, PA 15663-0102
PO BOX 103, MADISON, PA 15663-0103
PO BOX 104, MADISON, PA 15663-0104
PO BOX 105, MADISON, PA 15663-0105
PO BOX 106, MADISON, PA 15663-0106
PO BOX 107, MADISON, PA 15663-0107
PO BOX 108, MADISON, PA 15663-0108
PO BOX 109, MADISON, PA 15663-0109
PO BOX 110, MADISON, PA 15663-0110
PO BOX 111, MADISON, PA 15663-0111
PO BOX 112, MADISON, PA 15663-0112
PO BOX 113, MADISON, PA 15663-0113
PO BOX 114, MADISON, PA 15663-0114
PO BOX 115, MADISON, PA 15663-0115
PO BOX 116, MADISON, PA 15663-0116
PO BOX 117, MADISON, PA 15663-0117
PO BOX 118, MADISON, PA 15663-0118
PO BOX 119, MADISON, PA 15663-0119
PO BOX 120, MADISON, PA 15663-0120
PO BOX 121, MADISON, PA 15663-0121
PO BOX 122, MADISON, PA 15663-0122
PO BOX 123, MADISON, PA 15663-0123
PO BOX 124, MADISON, PA 15663-0124
PO BOX 125, MADISON, PA 15663-0125
PO BOX 126, MADISON, PA 15663-0126
PO BOX 127, MADISON, PA 15663-0127
PO BOX 128, MADISON, PA 15663-0128
PO BOX 129, MADISON, PA 15663-0129
PO BOX 130, MADISON, PA 15663-0130
PO BOX 131, MADISON, PA 15663-0131
PO BOX 132, MADISON, PA 15663-0132
PO BOX 133, MADISON, PA 15663-0133
PO BOX 134, MADISON, PA 15663-0134
PO BOX 135, MADISON, PA 15663-0135
PO BOX 136, MADISON, PA 15663-0136
PO BOX 137, MADISON, PA 15663-0137
PO BOX 138, MADISON, PA 15663-0138
PO BOX 139, MADISON, PA 15663-0139
PO BOX 140, MADISON, PA 15663-0140
PO BOX 141, MADISON, PA 15663-0141
PO BOX 142, MADISON, PA 15663-0142
PO BOX 143, MADISON, PA 15663-0143
PO BOX 144, MADISON, PA 15663-0144
PO BOX 145, MADISON, PA 15663-0145
PO BOX 146, MADISON, PA 15663-0146
PO BOX 147, MADISON, PA 15663-0147
PO BOX 148, MADISON, PA 15663-0148
PO BOX 149, MADISON, PA 15663-0149
PO BOX 150, MADISON, PA 15663-0150
PO BOX 151, MADISON, PA 15663-0151
PO BOX 152, MADISON, PA 15663-0152
PO BOX 153, MADISON, PA 15663-0153
PO BOX 154, MADISON, PA 15663-0154
PO BOX 155, MADISON, PA 15663-0155
PO BOX 156, MADISON, PA 15663-0156
PO BOX 157, MADISON, PA 15663-0157
PO BOX 158, MADISON, PA 15663-0158
PO BOX 159, MADISON, PA 15663-0159
PO BOX 160, MADISON, PA 15663-0160
PO BOX 161, MADISON, PA 15663-0161
PO BOX 162, MADISON, PA 15663-0162
PO BOX 163, MADISON, PA 15663-0163
PO BOX 164, MADISON, PA 15663-0164
PO BOX 165, MADISON, PA 15663-0165
PO BOX 166, MADISON, PA 15663-0166
PO BOX 167, MADISON, PA 15663-0167
PO BOX 168, MADISON, PA 15663-0168
PO BOX 169, MADISON, PA 15663-0169
PO BOX 170, MADISON, PA 15663-0170
PO BOX 171, MADISON, PA 15663-0171
PO BOX 172, MADISON, PA 15663-0172
PO BOX 173, MADISON, PA 15663-0173
PO BOX 174, MADISON, PA 15663-0174
PO BOX 175, MADISON, PA 15663-0175
PO BOX 176, MADISON, PA 15663-0176
PO BOX 177, MADISON, PA 15663-0177
PO BOX 178, MADISON, PA 15663-0178
PO BOX 179, MADISON, PA 15663-0179
PO BOX 180, MADISON, PA 15663-0180
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