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, JEFFERSON, PA 15344-0001
PO BOX 2, JEFFERSON, PA 15344-0002
PO BOX 3, JEFFERSON, PA 15344-0003
PO BOX 4, JEFFERSON, PA 15344-0004
PO BOX 5, JEFFERSON, PA 15344-0005
PO BOX 6, JEFFERSON, PA 15344-0006
PO BOX 7, JEFFERSON, PA 15344-0007
PO BOX 8, JEFFERSON, PA 15344-0008
PO BOX 9, JEFFERSON, PA 15344-0009
PO BOX 10, JEFFERSON, PA 15344-0010
PO BOX 11, JEFFERSON, PA 15344-0011
PO BOX 12, JEFFERSON, PA 15344-0012
PO BOX 13, JEFFERSON, PA 15344-0013
PO BOX 14, JEFFERSON, PA 15344-0014
PO BOX 15, JEFFERSON, PA 15344-0015
PO BOX 16, JEFFERSON, PA 15344-0016
PO BOX 17, JEFFERSON, PA 15344-0017
PO BOX 18, JEFFERSON, PA 15344-0018
PO BOX 19, JEFFERSON, PA 15344-0019
PO BOX 20, JEFFERSON, PA 15344-0020
PO BOX 21, JEFFERSON, PA 15344-0021
PO BOX 22, JEFFERSON, PA 15344-0022
PO BOX 23, JEFFERSON, PA 15344-0023
PO BOX 24, JEFFERSON, PA 15344-0024
PO BOX 25, JEFFERSON, PA 15344-0025
PO BOX 26, JEFFERSON, PA 15344-0026
PO BOX 27, JEFFERSON, PA 15344-0027
PO BOX 28, JEFFERSON, PA 15344-0028
PO BOX 29, JEFFERSON, PA 15344-0029
PO BOX 30, JEFFERSON, PA 15344-0030
PO BOX 31, JEFFERSON, PA 15344-0031
PO BOX 32, JEFFERSON, PA 15344-0032
PO BOX 33, JEFFERSON, PA 15344-0033
PO BOX 34, JEFFERSON, PA 15344-0034
PO BOX 35, JEFFERSON, PA 15344-0035
PO BOX 36, JEFFERSON, PA 15344-0036
PO BOX 37, JEFFERSON, PA 15344-0037
PO BOX 38, JEFFERSON, PA 15344-0038
PO BOX 39, JEFFERSON, PA 15344-0039
PO BOX 40, JEFFERSON, PA 15344-0040
PO BOX 41, JEFFERSON, PA 15344-0041
PO BOX 42, JEFFERSON, PA 15344-0042
PO BOX 43, JEFFERSON, PA 15344-0043
PO BOX 44, JEFFERSON, PA 15344-0044
PO BOX 45, JEFFERSON, PA 15344-0045
PO BOX 46, JEFFERSON, PA 15344-0046
PO BOX 47, JEFFERSON, PA 15344-0047
PO BOX 48, JEFFERSON, PA 15344-0048
PO BOX 49, JEFFERSON, PA 15344-0049
PO BOX 50, JEFFERSON, PA 15344-0050
PO BOX 51, JEFFERSON, PA 15344-0051
PO BOX 52, JEFFERSON, PA 15344-0052
PO BOX 53, JEFFERSON, PA 15344-0053
PO BOX 54, JEFFERSON, PA 15344-0054
PO BOX 55, JEFFERSON, PA 15344-0055
PO BOX 56, JEFFERSON, PA 15344-0056
PO BOX 57, JEFFERSON, PA 15344-0057
PO BOX 58, JEFFERSON, PA 15344-0058
PO BOX 59, JEFFERSON, PA 15344-0059
PO BOX 60, JEFFERSON, PA 15344-0060
PO BOX 61, JEFFERSON, PA 15344-0061
PO BOX 62, JEFFERSON, PA 15344-0062
PO BOX 63, JEFFERSON, PA 15344-0063
PO BOX 64, JEFFERSON, PA 15344-0064
PO BOX 65, JEFFERSON, PA 15344-0065
PO BOX 66, JEFFERSON, PA 15344-0066
PO BOX 67, JEFFERSON, PA 15344-0067
PO BOX 68, JEFFERSON, PA 15344-0068
PO BOX 69, JEFFERSON, PA 15344-0069
PO BOX 70, JEFFERSON, PA 15344-0070
PO BOX 71, JEFFERSON, PA 15344-0071
PO BOX 72, JEFFERSON, PA 15344-0072
PO BOX 73, JEFFERSON, PA 15344-0073
PO BOX 74, JEFFERSON, PA 15344-0074
PO BOX 75, JEFFERSON, PA 15344-0075
PO BOX 76, JEFFERSON, PA 15344-0076
PO BOX 77, JEFFERSON, PA 15344-0077
PO BOX 78, JEFFERSON, PA 15344-0078
PO BOX 79, JEFFERSON, PA 15344-0079
PO BOX 80, JEFFERSON, PA 15344-0080
PO BOX 81, JEFFERSON, PA 15344-0081
PO BOX 82, JEFFERSON, PA 15344-0082
PO BOX 83, JEFFERSON, PA 15344-0083
PO BOX 84, JEFFERSON, PA 15344-0084
PO BOX 85, JEFFERSON, PA 15344-0085
PO BOX 86, JEFFERSON, PA 15344-0086
PO BOX 87, JEFFERSON, PA 15344-0087
PO BOX 88, JEFFERSON, PA 15344-0088
PO BOX 89, JEFFERSON, PA 15344-0089
PO BOX 90, JEFFERSON, PA 15344-0090
PO BOX 91, JEFFERSON, PA 15344-0091
PO BOX 92, JEFFERSON, PA 15344-0092
PO BOX 93, JEFFERSON, PA 15344-0093
PO BOX 94, JEFFERSON, PA 15344-0094
PO BOX 95, JEFFERSON, PA 15344-0095
PO BOX 96, JEFFERSON, PA 15344-0096
PO BOX 97, JEFFERSON, PA 15344-0097
PO BOX 98, JEFFERSON, PA 15344-0098
PO BOX 99, JEFFERSON, PA 15344-0099
PO BOX 100, JEFFERSON, PA 15344-0100
PO BOX 101, JEFFERSON, PA 15344-0101
PO BOX 102, JEFFERSON, PA 15344-0102
PO BOX 103, JEFFERSON, PA 15344-0103
PO BOX 104, JEFFERSON, PA 15344-0104
PO BOX 105, JEFFERSON, PA 15344-0105
PO BOX 106, JEFFERSON, PA 15344-0106
PO BOX 107, JEFFERSON, PA 15344-0107
PO BOX 108, JEFFERSON, PA 15344-0108
PO BOX 109, JEFFERSON, PA 15344-0109
PO BOX 110, JEFFERSON, PA 15344-0110
PO BOX 111, JEFFERSON, PA 15344-0111
PO BOX 112, JEFFERSON, PA 15344-0112
PO BOX 113, JEFFERSON, PA 15344-0113
PO BOX 114, JEFFERSON, PA 15344-0114
PO BOX 115, JEFFERSON, PA 15344-0115
PO BOX 116, JEFFERSON, PA 15344-0116
PO BOX 117, JEFFERSON, PA 15344-0117
PO BOX 118, JEFFERSON, PA 15344-0118
PO BOX 119, JEFFERSON, PA 15344-0119
PO BOX 120, JEFFERSON, PA 15344-0120
PO BOX 121, JEFFERSON, PA 15344-0121
PO BOX 122, JEFFERSON, PA 15344-0122
PO BOX 123, JEFFERSON, PA 15344-0123
PO BOX 124, JEFFERSON, PA 15344-0124
PO BOX 125, JEFFERSON, PA 15344-0125
PO BOX 126, JEFFERSON, PA 15344-0126
PO BOX 127, JEFFERSON, PA 15344-0127
PO BOX 128, JEFFERSON, PA 15344-0128
PO BOX 129, JEFFERSON, PA 15344-0129
PO BOX 130, JEFFERSON, PA 15344-0130
PO BOX 131, JEFFERSON, PA 15344-0131
PO BOX 132, JEFFERSON, PA 15344-0132
PO BOX 133, JEFFERSON, PA 15344-0133
PO BOX 134, JEFFERSON, PA 15344-0134
PO BOX 135, JEFFERSON, PA 15344-0135
PO BOX 136, JEFFERSON, PA 15344-0136
PO BOX 137, JEFFERSON, PA 15344-0137
PO BOX 138, JEFFERSON, PA 15344-0138
PO BOX 139, JEFFERSON, PA 15344-0139
PO BOX 140, JEFFERSON, PA 15344-0140
PO BOX 141, JEFFERSON, PA 15344-0141
PO BOX 142, JEFFERSON, PA 15344-0142
PO BOX 143, JEFFERSON, PA 15344-0143
PO BOX 144, JEFFERSON, PA 15344-0144
PO BOX 145, JEFFERSON, PA 15344-0145
PO BOX 146, JEFFERSON, PA 15344-0146
PO BOX 147, JEFFERSON, PA 15344-0147
PO BOX 148, JEFFERSON, PA 15344-0148
PO BOX 149, JEFFERSON, PA 15344-0149
PO BOX 150, JEFFERSON, PA 15344-0150
PO BOX 151, JEFFERSON, PA 15344-0151
PO BOX 152, JEFFERSON, PA 15344-0152
PO BOX 153, JEFFERSON, PA 15344-0153
PO BOX 154, JEFFERSON, PA 15344-0154
PO BOX 155, JEFFERSON, PA 15344-0155
PO BOX 156, JEFFERSON, PA 15344-0156
PO BOX 157, JEFFERSON, PA 15344-0157
PO BOX 158, JEFFERSON, PA 15344-0158
PO BOX 159, JEFFERSON, PA 15344-0159
PO BOX 160, JEFFERSON, PA 15344-0160
PO BOX 161, JEFFERSON, PA 15344-0161
PO BOX 162, JEFFERSON, PA 15344-0162
PO BOX 163, JEFFERSON, PA 15344-0163
PO BOX 164, JEFFERSON, PA 15344-0164
PO BOX 165, JEFFERSON, PA 15344-0165
PO BOX 166, JEFFERSON, PA 15344-0166
PO BOX 167, JEFFERSON, PA 15344-0167
PO BOX 168, JEFFERSON, PA 15344-0168
PO BOX 169, JEFFERSON, PA 15344-0169
PO BOX 170, JEFFERSON, PA 15344-0170
PO BOX 171, JEFFERSON, PA 15344-0171
PO BOX 172, JEFFERSON, PA 15344-0172
PO BOX 173, JEFFERSON, PA 15344-0173
PO BOX 174, JEFFERSON, PA 15344-0174
PO BOX 175, JEFFERSON, PA 15344-0175
PO BOX 176, JEFFERSON, PA 15344-0176
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