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, MIFFLINBURG, PA 17844-0001
PO BOX 2, MIFFLINBURG, PA 17844-0002
PO BOX 3, MIFFLINBURG, PA 17844-0003
PO BOX 4, MIFFLINBURG, PA 17844-0004
PO BOX 5, MIFFLINBURG, PA 17844-0005
PO BOX 6, MIFFLINBURG, PA 17844-0006
PO BOX 7, MIFFLINBURG, PA 17844-0007
PO BOX 8, MIFFLINBURG, PA 17844-0008
PO BOX 9, MIFFLINBURG, PA 17844-0009
PO BOX 10, MIFFLINBURG, PA 17844-0010
PO BOX 11, MIFFLINBURG, PA 17844-0011
PO BOX 12, MIFFLINBURG, PA 17844-0012
PO BOX 13, MIFFLINBURG, PA 17844-0013
PO BOX 14, MIFFLINBURG, PA 17844-0014
PO BOX 15, MIFFLINBURG, PA 17844-0015
PO BOX 16, MIFFLINBURG, PA 17844-0016
PO BOX 17, MIFFLINBURG, PA 17844-0017
PO BOX 18, MIFFLINBURG, PA 17844-0018
PO BOX 19, MIFFLINBURG, PA 17844-0019
PO BOX 20, MIFFLINBURG, PA 17844-0020
PO BOX 21, MIFFLINBURG, PA 17844-0021
PO BOX 22, MIFFLINBURG, PA 17844-0022
PO BOX 23, MIFFLINBURG, PA 17844-0023
PO BOX 24, MIFFLINBURG, PA 17844-0024
PO BOX 25, MIFFLINBURG, PA 17844-0025
PO BOX 26, MIFFLINBURG, PA 17844-0026
PO BOX 27, MIFFLINBURG, PA 17844-0027
PO BOX 28, MIFFLINBURG, PA 17844-0028
PO BOX 29, MIFFLINBURG, PA 17844-0029
PO BOX 30, MIFFLINBURG, PA 17844-0030
PO BOX 31, MIFFLINBURG, PA 17844-0031
PO BOX 32, MIFFLINBURG, PA 17844-0032
PO BOX 33, MIFFLINBURG, PA 17844-0033
PO BOX 34, MIFFLINBURG, PA 17844-0034
PO BOX 35, MIFFLINBURG, PA 17844-0035
PO BOX 36, MIFFLINBURG, PA 17844-0036
PO BOX 37, MIFFLINBURG, PA 17844-0037
PO BOX 38, MIFFLINBURG, PA 17844-0038
PO BOX 39, MIFFLINBURG, PA 17844-0039
PO BOX 40, MIFFLINBURG, PA 17844-0040
PO BOX 41, MIFFLINBURG, PA 17844-0041
PO BOX 42, MIFFLINBURG, PA 17844-0042
PO BOX 43, MIFFLINBURG, PA 17844-0043
PO BOX 44, MIFFLINBURG, PA 17844-0044
PO BOX 45, MIFFLINBURG, PA 17844-0045
PO BOX 46, MIFFLINBURG, PA 17844-0046
PO BOX 47, MIFFLINBURG, PA 17844-0047
PO BOX 48, MIFFLINBURG, PA 17844-0048
PO BOX 49, MIFFLINBURG, PA 17844-0049
PO BOX 50, MIFFLINBURG, PA 17844-0050
PO BOX 51, MIFFLINBURG, PA 17844-0051
PO BOX 52, MIFFLINBURG, PA 17844-0052
PO BOX 53, MIFFLINBURG, PA 17844-0053
PO BOX 54, MIFFLINBURG, PA 17844-0054
PO BOX 55, MIFFLINBURG, PA 17844-0055
PO BOX 56, MIFFLINBURG, PA 17844-0056
PO BOX 57, MIFFLINBURG, PA 17844-0057
PO BOX 58, MIFFLINBURG, PA 17844-0058
PO BOX 59, MIFFLINBURG, PA 17844-0059
PO BOX 60, MIFFLINBURG, PA 17844-0060
PO BOX 61, MIFFLINBURG, PA 17844-0061
PO BOX 62, MIFFLINBURG, PA 17844-0062
PO BOX 63, MIFFLINBURG, PA 17844-0063
PO BOX 64, MIFFLINBURG, PA 17844-0064
PO BOX 65, MIFFLINBURG, PA 17844-0065
PO BOX 66, MIFFLINBURG, PA 17844-0066
PO BOX 67, MIFFLINBURG, PA 17844-0067
PO BOX 68, MIFFLINBURG, PA 17844-0068
PO BOX 69, MIFFLINBURG, PA 17844-0069
PO BOX 70, MIFFLINBURG, PA 17844-0070
PO BOX 71, MIFFLINBURG, PA 17844-0071
PO BOX 72, MIFFLINBURG, PA 17844-0072
PO BOX 73, MIFFLINBURG, PA 17844-0073
PO BOX 74, MIFFLINBURG, PA 17844-0074
PO BOX 75, MIFFLINBURG, PA 17844-0075
PO BOX 76, MIFFLINBURG, PA 17844-0076
PO BOX 77, MIFFLINBURG, PA 17844-0077
PO BOX 78, MIFFLINBURG, PA 17844-0078
PO BOX 79, MIFFLINBURG, PA 17844-0079
PO BOX 80, MIFFLINBURG, PA 17844-0080
PO BOX 81, MIFFLINBURG, PA 17844-0081
PO BOX 82, MIFFLINBURG, PA 17844-0082
PO BOX 83, MIFFLINBURG, PA 17844-0083
PO BOX 84, MIFFLINBURG, PA 17844-0084
PO BOX 85, MIFFLINBURG, PA 17844-0085
PO BOX 86, MIFFLINBURG, PA 17844-0086
PO BOX 87, MIFFLINBURG, PA 17844-0087
PO BOX 88, MIFFLINBURG, PA 17844-0088
PO BOX 89, MIFFLINBURG, PA 17844-0089
PO BOX 90, MIFFLINBURG, PA 17844-0090
PO BOX 91, MIFFLINBURG, PA 17844-0091
PO BOX 92, MIFFLINBURG, PA 17844-0092
PO BOX 93, MIFFLINBURG, PA 17844-0093
PO BOX 94, MIFFLINBURG, PA 17844-0094
PO BOX 95, MIFFLINBURG, PA 17844-0095
PO BOX 96, MIFFLINBURG, PA 17844-0096
PO BOX 97, MIFFLINBURG, PA 17844-0097
PO BOX 98, MIFFLINBURG, PA 17844-0098
PO BOX 99, MIFFLINBURG, PA 17844-0099
PO BOX 100, MIFFLINBURG, PA 17844-0100
PO BOX 101, MIFFLINBURG, PA 17844-0101
PO BOX 102, MIFFLINBURG, PA 17844-0102
PO BOX 103, MIFFLINBURG, PA 17844-0103
PO BOX 104, MIFFLINBURG, PA 17844-0104
PO BOX 105, MIFFLINBURG, PA 17844-0105
PO BOX 106, MIFFLINBURG, PA 17844-0106
PO BOX 107, MIFFLINBURG, PA 17844-0107
PO BOX 108, MIFFLINBURG, PA 17844-0108
PO BOX 109, MIFFLINBURG, PA 17844-0109
PO BOX 110, MIFFLINBURG, PA 17844-0110
PO BOX 111, MIFFLINBURG, PA 17844-0111
PO BOX 112, MIFFLINBURG, PA 17844-0112
PO BOX 113, MIFFLINBURG, PA 17844-0113
PO BOX 114, MIFFLINBURG, PA 17844-0114
PO BOX 115, MIFFLINBURG, PA 17844-0115
PO BOX 116, MIFFLINBURG, PA 17844-0116
PO BOX 117, MIFFLINBURG, PA 17844-0117
PO BOX 118, MIFFLINBURG, PA 17844-0118
PO BOX 119, MIFFLINBURG, PA 17844-0119
PO BOX 120, MIFFLINBURG, PA 17844-0120
PO BOX 121, MIFFLINBURG, PA 17844-0121
PO BOX 122, MIFFLINBURG, PA 17844-0122
PO BOX 123, MIFFLINBURG, PA 17844-0123
PO BOX 124, MIFFLINBURG, PA 17844-0124
PO BOX 125, MIFFLINBURG, PA 17844-0125
PO BOX 126, MIFFLINBURG, PA 17844-0126
PO BOX 127, MIFFLINBURG, PA 17844-0127
PO BOX 128, MIFFLINBURG, PA 17844-0128
PO BOX 129, MIFFLINBURG, PA 17844-0129
PO BOX 130, MIFFLINBURG, PA 17844-0130
PO BOX 131, MIFFLINBURG, PA 17844-0131
PO BOX 132, MIFFLINBURG, PA 17844-0132
PO BOX 133, MIFFLINBURG, PA 17844-0133
PO BOX 134, MIFFLINBURG, PA 17844-0134
PO BOX 135, MIFFLINBURG, PA 17844-0135
PO BOX 136, MIFFLINBURG, PA 17844-0136
PO BOX 137, MIFFLINBURG, PA 17844-0137
PO BOX 138, MIFFLINBURG, PA 17844-0138
PO BOX 139, MIFFLINBURG, PA 17844-0139
PO BOX 140, MIFFLINBURG, PA 17844-0140
PO BOX 141, MIFFLINBURG, PA 17844-0141
PO BOX 142, MIFFLINBURG, PA 17844-0142
PO BOX 143, MIFFLINBURG, PA 17844-0143
PO BOX 144, MIFFLINBURG, PA 17844-0144
PO BOX 145, MIFFLINBURG, PA 17844-0145
PO BOX 146, MIFFLINBURG, PA 17844-0146
PO BOX 147, MIFFLINBURG, PA 17844-0147
PO BOX 148, MIFFLINBURG, PA 17844-0148
PO BOX 149, MIFFLINBURG, PA 17844-0149
PO BOX 150, MIFFLINBURG, PA 17844-0150
PO BOX 151, MIFFLINBURG, PA 17844-0151
PO BOX 152, MIFFLINBURG, PA 17844-0152
PO BOX 153, MIFFLINBURG, PA 17844-0153
PO BOX 154, MIFFLINBURG, PA 17844-0154
PO BOX 155, MIFFLINBURG, PA 17844-0155
PO BOX 156, MIFFLINBURG, PA 17844-0156
PO BOX 157, MIFFLINBURG, PA 17844-0157
PO BOX 158, MIFFLINBURG, PA 17844-0158
PO BOX 159, MIFFLINBURG, PA 17844-0159
PO BOX 160, MIFFLINBURG, PA 17844-0160
PO BOX 161, MIFFLINBURG, PA 17844-0161
PO BOX 162, MIFFLINBURG, PA 17844-0162
PO BOX 163, MIFFLINBURG, PA 17844-0163
PO BOX 164, MIFFLINBURG, PA 17844-0164
PO BOX 165, MIFFLINBURG, PA 17844-0165
PO BOX 166, MIFFLINBURG, PA 17844-0166
PO BOX 167, MIFFLINBURG, PA 17844-0167
PO BOX 168, MIFFLINBURG, PA 17844-0168
PO BOX 169, MIFFLINBURG, PA 17844-0169
PO BOX 170, MIFFLINBURG, PA 17844-0170
PO BOX 171, MIFFLINBURG, PA 17844-0171
PO BOX 172, MIFFLINBURG, PA 17844-0172
PO BOX 173, MIFFLINBURG, PA 17844-0173
PO BOX 174, MIFFLINBURG, PA 17844-0174
PO BOX 175, MIFFLINBURG, PA 17844-0175
PO BOX 176, MIFFLINBURG, PA 17844-0176
PO BOX 177, MIFFLINBURG, PA 17844-0177
PO BOX 178, MIFFLINBURG, PA 17844-0178
PO BOX 179, MIFFLINBURG, PA 17844-0179
PO BOX 180, MIFFLINBURG, PA 17844-0180
PO BOX 181, MIFFLINBURG, PA 17844-0181
PO BOX 182, MIFFLINBURG, PA 17844-0182
PO BOX 183, MIFFLINBURG, PA 17844-0183
PO BOX 184, MIFFLINBURG, PA 17844-0184
PO BOX 185, MIFFLINBURG, PA 17844-0185
PO BOX 186, MIFFLINBURG, PA 17844-0186
PO BOX 187, MIFFLINBURG, PA 17844-0187
PO BOX 188, MIFFLINBURG, PA 17844-0188
PO BOX 189, MIFFLINBURG, PA 17844-0189
PO BOX 190, MIFFLINBURG, PA 17844-0190
PO BOX 191, MIFFLINBURG, PA 17844-0191
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