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, SCHELLSBURG, PA 15559-0001
PO BOX 2, SCHELLSBURG, PA 15559-0002
PO BOX 3, SCHELLSBURG, PA 15559-0003
PO BOX 4, SCHELLSBURG, PA 15559-0004
PO BOX 5, SCHELLSBURG, PA 15559-0005
PO BOX 6, SCHELLSBURG, PA 15559-0006
PO BOX 7, SCHELLSBURG, PA 15559-0007
PO BOX 8, SCHELLSBURG, PA 15559-0008
PO BOX 9, SCHELLSBURG, PA 15559-0009
PO BOX 10, SCHELLSBURG, PA 15559-0010
PO BOX 11, SCHELLSBURG, PA 15559-0011
PO BOX 12, SCHELLSBURG, PA 15559-0012
PO BOX 13, SCHELLSBURG, PA 15559-0013
PO BOX 14, SCHELLSBURG, PA 15559-0014
PO BOX 15, SCHELLSBURG, PA 15559-0015
PO BOX 16, SCHELLSBURG, PA 15559-0016
PO BOX 17, SCHELLSBURG, PA 15559-0017
PO BOX 18, SCHELLSBURG, PA 15559-0018
PO BOX 19, SCHELLSBURG, PA 15559-0019
PO BOX 20, SCHELLSBURG, PA 15559-0020
PO BOX 21, SCHELLSBURG, PA 15559-0021
PO BOX 22, SCHELLSBURG, PA 15559-0022
PO BOX 23, SCHELLSBURG, PA 15559-0023
PO BOX 24, SCHELLSBURG, PA 15559-0024
PO BOX 25, SCHELLSBURG, PA 15559-0025
PO BOX 26, SCHELLSBURG, PA 15559-0026
PO BOX 27, SCHELLSBURG, PA 15559-0027
PO BOX 28, SCHELLSBURG, PA 15559-0028
PO BOX 29, SCHELLSBURG, PA 15559-0029
PO BOX 30, SCHELLSBURG, PA 15559-0030
PO BOX 31, SCHELLSBURG, PA 15559-0031
PO BOX 32, SCHELLSBURG, PA 15559-0032
PO BOX 33, SCHELLSBURG, PA 15559-0033
PO BOX 34, SCHELLSBURG, PA 15559-0034
PO BOX 35, SCHELLSBURG, PA 15559-0035
PO BOX 36, SCHELLSBURG, PA 15559-0036
PO BOX 37, SCHELLSBURG, PA 15559-0037
PO BOX 38, SCHELLSBURG, PA 15559-0038
PO BOX 39, SCHELLSBURG, PA 15559-0039
PO BOX 40, SCHELLSBURG, PA 15559-0040
PO BOX 41, SCHELLSBURG, PA 15559-0041
PO BOX 42, SCHELLSBURG, PA 15559-0042
PO BOX 43, SCHELLSBURG, PA 15559-0043
PO BOX 44, SCHELLSBURG, PA 15559-0044
PO BOX 45, SCHELLSBURG, PA 15559-0045
PO BOX 46, SCHELLSBURG, PA 15559-0046
PO BOX 47, SCHELLSBURG, PA 15559-0047
PO BOX 48, SCHELLSBURG, PA 15559-0048
PO BOX 49, SCHELLSBURG, PA 15559-0049
PO BOX 50, SCHELLSBURG, PA 15559-0050
PO BOX 51, SCHELLSBURG, PA 15559-0051
PO BOX 52, SCHELLSBURG, PA 15559-0052
PO BOX 53, SCHELLSBURG, PA 15559-0053
PO BOX 54, SCHELLSBURG, PA 15559-0054
PO BOX 55, SCHELLSBURG, PA 15559-0055
PO BOX 56, SCHELLSBURG, PA 15559-0056
PO BOX 57, SCHELLSBURG, PA 15559-0057
PO BOX 58, SCHELLSBURG, PA 15559-0058
PO BOX 59, SCHELLSBURG, PA 15559-0059
PO BOX 60, SCHELLSBURG, PA 15559-0060
PO BOX 61, SCHELLSBURG, PA 15559-0061
PO BOX 62, SCHELLSBURG, PA 15559-0062
PO BOX 63, SCHELLSBURG, PA 15559-0063
PO BOX 64, SCHELLSBURG, PA 15559-0064
PO BOX 65, SCHELLSBURG, PA 15559-0065
PO BOX 66, SCHELLSBURG, PA 15559-0066
PO BOX 67, SCHELLSBURG, PA 15559-0067
PO BOX 68, SCHELLSBURG, PA 15559-0068
PO BOX 69, SCHELLSBURG, PA 15559-0069
PO BOX 70, SCHELLSBURG, PA 15559-0070
PO BOX 71, SCHELLSBURG, PA 15559-0071
PO BOX 72, SCHELLSBURG, PA 15559-0072
PO BOX 73, SCHELLSBURG, PA 15559-0073
PO BOX 74, SCHELLSBURG, PA 15559-0074
PO BOX 75, SCHELLSBURG, PA 15559-0075
PO BOX 76, SCHELLSBURG, PA 15559-0076
PO BOX 77, SCHELLSBURG, PA 15559-0077
PO BOX 78, SCHELLSBURG, PA 15559-0078
PO BOX 79, SCHELLSBURG, PA 15559-0079
PO BOX 80, SCHELLSBURG, PA 15559-0080
PO BOX 81, SCHELLSBURG, PA 15559-0081
PO BOX 82, SCHELLSBURG, PA 15559-0082
PO BOX 83, SCHELLSBURG, PA 15559-0083
PO BOX 84, SCHELLSBURG, PA 15559-0084
PO BOX 85, SCHELLSBURG, PA 15559-0085
PO BOX 86, SCHELLSBURG, PA 15559-0086
PO BOX 87, SCHELLSBURG, PA 15559-0087
PO BOX 88, SCHELLSBURG, PA 15559-0088
PO BOX 89, SCHELLSBURG, PA 15559-0089
PO BOX 90, SCHELLSBURG, PA 15559-0090
PO BOX 91, SCHELLSBURG, PA 15559-0091
PO BOX 92, SCHELLSBURG, PA 15559-0092
PO BOX 93, SCHELLSBURG, PA 15559-0093
PO BOX 94, SCHELLSBURG, PA 15559-0094
PO BOX 95, SCHELLSBURG, PA 15559-0095
PO BOX 96, SCHELLSBURG, PA 15559-0096
PO BOX 97, SCHELLSBURG, PA 15559-0097
PO BOX 98, SCHELLSBURG, PA 15559-0098
PO BOX 99, SCHELLSBURG, PA 15559-0099
PO BOX 100, SCHELLSBURG, PA 15559-0100
PO BOX 101, SCHELLSBURG, PA 15559-0101
PO BOX 102, SCHELLSBURG, PA 15559-0102
PO BOX 103, SCHELLSBURG, PA 15559-0103
PO BOX 104, SCHELLSBURG, PA 15559-0104
PO BOX 105, SCHELLSBURG, PA 15559-0105
PO BOX 106, SCHELLSBURG, PA 15559-0106
PO BOX 107, SCHELLSBURG, PA 15559-0107
PO BOX 108, SCHELLSBURG, PA 15559-0108
PO BOX 109, SCHELLSBURG, PA 15559-0109
PO BOX 110, SCHELLSBURG, PA 15559-0110
PO BOX 111, SCHELLSBURG, PA 15559-0111
PO BOX 112, SCHELLSBURG, PA 15559-0112
PO BOX 113, SCHELLSBURG, PA 15559-0113
PO BOX 114, SCHELLSBURG, PA 15559-0114
PO BOX 115, SCHELLSBURG, PA 15559-0115
PO BOX 116, SCHELLSBURG, PA 15559-0116
PO BOX 117, SCHELLSBURG, PA 15559-0117
PO BOX 118, SCHELLSBURG, PA 15559-0118
PO BOX 119, SCHELLSBURG, PA 15559-0119
PO BOX 120, SCHELLSBURG, PA 15559-0120
PO BOX 121, SCHELLSBURG, PA 15559-0121
PO BOX 122, SCHELLSBURG, PA 15559-0122
PO BOX 123, SCHELLSBURG, PA 15559-0123
PO BOX 124, SCHELLSBURG, PA 15559-0124
PO BOX 125, SCHELLSBURG, PA 15559-0125
PO BOX 126, SCHELLSBURG, PA 15559-0126
PO BOX 127, SCHELLSBURG, PA 15559-0127
PO BOX 128, SCHELLSBURG, PA 15559-0128
PO BOX 129, SCHELLSBURG, PA 15559-0129
PO BOX 130, SCHELLSBURG, PA 15559-0130
PO BOX 131, SCHELLSBURG, PA 15559-0131
PO BOX 132, SCHELLSBURG, PA 15559-0132
PO BOX 133, SCHELLSBURG, PA 15559-0133
PO BOX 134, SCHELLSBURG, PA 15559-0134
PO BOX 135, SCHELLSBURG, PA 15559-0135
PO BOX 136, SCHELLSBURG, PA 15559-0136
PO BOX 137, SCHELLSBURG, PA 15559-0137
PO BOX 138, SCHELLSBURG, PA 15559-0138
PO BOX 139, SCHELLSBURG, PA 15559-0139
PO BOX 140, SCHELLSBURG, PA 15559-0140
PO BOX 141, SCHELLSBURG, PA 15559-0141
PO BOX 142, SCHELLSBURG, PA 15559-0142
PO BOX 143, SCHELLSBURG, PA 15559-0143
PO BOX 144, SCHELLSBURG, PA 15559-0144
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