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, HARPERS FERRY, IA 52146-0001
PO BOX 2, HARPERS FERRY, IA 52146-0002
PO BOX 3, HARPERS FERRY, IA 52146-0003
PO BOX 4, HARPERS FERRY, IA 52146-0004
PO BOX 5, HARPERS FERRY, IA 52146-0005
PO BOX 6, HARPERS FERRY, IA 52146-0006
PO BOX 7, HARPERS FERRY, IA 52146-0007
PO BOX 8, HARPERS FERRY, IA 52146-0008
PO BOX 9, HARPERS FERRY, IA 52146-0009
PO BOX 10, HARPERS FERRY, IA 52146-0010
PO BOX 11, HARPERS FERRY, IA 52146-0011
PO BOX 12, HARPERS FERRY, IA 52146-0012
PO BOX 13, HARPERS FERRY, IA 52146-0013
PO BOX 14, HARPERS FERRY, IA 52146-0014
PO BOX 15, HARPERS FERRY, IA 52146-0015
PO BOX 16, HARPERS FERRY, IA 52146-0016
PO BOX 17, HARPERS FERRY, IA 52146-0017
PO BOX 18, HARPERS FERRY, IA 52146-0018
PO BOX 19, HARPERS FERRY, IA 52146-0019
PO BOX 20, HARPERS FERRY, IA 52146-0020
PO BOX 21, HARPERS FERRY, IA 52146-0021
PO BOX 22, HARPERS FERRY, IA 52146-0022
PO BOX 23, HARPERS FERRY, IA 52146-0023
PO BOX 24, HARPERS FERRY, IA 52146-0024
PO BOX 25, HARPERS FERRY, IA 52146-0025
PO BOX 26, HARPERS FERRY, IA 52146-0026
PO BOX 27, HARPERS FERRY, IA 52146-0027
PO BOX 28, HARPERS FERRY, IA 52146-0028
PO BOX 29, HARPERS FERRY, IA 52146-0029
PO BOX 30, HARPERS FERRY, IA 52146-0030
PO BOX 31, HARPERS FERRY, IA 52146-0031
PO BOX 32, HARPERS FERRY, IA 52146-0032
PO BOX 33, HARPERS FERRY, IA 52146-0033
PO BOX 34, HARPERS FERRY, IA 52146-0034
PO BOX 35, HARPERS FERRY, IA 52146-0035
PO BOX 36, HARPERS FERRY, IA 52146-0036
PO BOX 37, HARPERS FERRY, IA 52146-0037
PO BOX 38, HARPERS FERRY, IA 52146-0038
PO BOX 39, HARPERS FERRY, IA 52146-0039
PO BOX 40, HARPERS FERRY, IA 52146-0040
PO BOX 41, HARPERS FERRY, IA 52146-0041
PO BOX 42, HARPERS FERRY, IA 52146-0042
PO BOX 43, HARPERS FERRY, IA 52146-0043
PO BOX 44, HARPERS FERRY, IA 52146-0044
PO BOX 45, HARPERS FERRY, IA 52146-0045
PO BOX 46, HARPERS FERRY, IA 52146-0046
PO BOX 47, HARPERS FERRY, IA 52146-0047
PO BOX 48, HARPERS FERRY, IA 52146-0048
PO BOX 49, HARPERS FERRY, IA 52146-0049
PO BOX 50, HARPERS FERRY, IA 52146-0050
PO BOX 51, HARPERS FERRY, IA 52146-0051
PO BOX 52, HARPERS FERRY, IA 52146-0052
PO BOX 53, HARPERS FERRY, IA 52146-0053
PO BOX 54, HARPERS FERRY, IA 52146-0054
PO BOX 55, HARPERS FERRY, IA 52146-0055
PO BOX 56, HARPERS FERRY, IA 52146-0056
PO BOX 57, HARPERS FERRY, IA 52146-0057
PO BOX 58, HARPERS FERRY, IA 52146-0058
PO BOX 59, HARPERS FERRY, IA 52146-0059
PO BOX 60, HARPERS FERRY, IA 52146-0060
PO BOX 61, HARPERS FERRY, IA 52146-0061
PO BOX 62, HARPERS FERRY, IA 52146-0062
PO BOX 63, HARPERS FERRY, IA 52146-0063
PO BOX 64, HARPERS FERRY, IA 52146-0064
PO BOX 65, HARPERS FERRY, IA 52146-0065
PO BOX 66, HARPERS FERRY, IA 52146-0066
PO BOX 67, HARPERS FERRY, IA 52146-0067
PO BOX 68, HARPERS FERRY, IA 52146-0068
PO BOX 69, HARPERS FERRY, IA 52146-0069
PO BOX 70, HARPERS FERRY, IA 52146-0070
PO BOX 71, HARPERS FERRY, IA 52146-0071
PO BOX 72, HARPERS FERRY, IA 52146-0072
PO BOX 73, HARPERS FERRY, IA 52146-0073
PO BOX 74, HARPERS FERRY, IA 52146-0074
PO BOX 75, HARPERS FERRY, IA 52146-0075
PO BOX 76, HARPERS FERRY, IA 52146-0076
PO BOX 77, HARPERS FERRY, IA 52146-0077
PO BOX 78, HARPERS FERRY, IA 52146-0078
PO BOX 79, HARPERS FERRY, IA 52146-0079
PO BOX 80, HARPERS FERRY, IA 52146-0080
PO BOX 81, HARPERS FERRY, IA 52146-0081
PO BOX 82, HARPERS FERRY, IA 52146-0082
PO BOX 83, HARPERS FERRY, IA 52146-0083
PO BOX 84, HARPERS FERRY, IA 52146-0084
PO BOX 85, HARPERS FERRY, IA 52146-0085
PO BOX 86, HARPERS FERRY, IA 52146-0086
PO BOX 87, HARPERS FERRY, IA 52146-0087
PO BOX 88, HARPERS FERRY, IA 52146-0088
PO BOX 89, HARPERS FERRY, IA 52146-0089
PO BOX 90, HARPERS FERRY, IA 52146-0090
PO BOX 91, HARPERS FERRY, IA 52146-0091
PO BOX 92, HARPERS FERRY, IA 52146-0092
PO BOX 93, HARPERS FERRY, IA 52146-0093
PO BOX 94, HARPERS FERRY, IA 52146-0094
PO BOX 95, HARPERS FERRY, IA 52146-0095
PO BOX 96, HARPERS FERRY, IA 52146-0096
PO BOX 97, HARPERS FERRY, IA 52146-0097
PO BOX 98, HARPERS FERRY, IA 52146-0098
PO BOX 99, HARPERS FERRY, IA 52146-0099
PO BOX 100, HARPERS FERRY, IA 52146-0100
PO BOX 101, HARPERS FERRY, IA 52146-0101
PO BOX 102, HARPERS FERRY, IA 52146-0102
PO BOX 103, HARPERS FERRY, IA 52146-0103
PO BOX 104, HARPERS FERRY, IA 52146-0104
PO BOX 105, HARPERS FERRY, IA 52146-0105
PO BOX 106, HARPERS FERRY, IA 52146-0106
PO BOX 107, HARPERS FERRY, IA 52146-0107
PO BOX 108, HARPERS FERRY, IA 52146-0108
PO BOX 109, HARPERS FERRY, IA 52146-0109
PO BOX 110, HARPERS FERRY, IA 52146-0110
PO BOX 111, HARPERS FERRY, IA 52146-0111
PO BOX 112, HARPERS FERRY, IA 52146-0112
PO BOX 113, HARPERS FERRY, IA 52146-0113
PO BOX 114, HARPERS FERRY, IA 52146-0114
PO BOX 115, HARPERS FERRY, IA 52146-0115
PO BOX 116, HARPERS FERRY, IA 52146-0116
PO BOX 117, HARPERS FERRY, IA 52146-0117
PO BOX 118, HARPERS FERRY, IA 52146-0118
PO BOX 119, HARPERS FERRY, IA 52146-0119
PO BOX 120, HARPERS FERRY, IA 52146-0120
PO BOX 121, HARPERS FERRY, IA 52146-0121
PO BOX 122, HARPERS FERRY, IA 52146-0122
PO BOX 123, HARPERS FERRY, IA 52146-0123
PO BOX 124, HARPERS FERRY, IA 52146-0124
PO BOX 125, HARPERS FERRY, IA 52146-0125
PO BOX 126, HARPERS FERRY, IA 52146-0126
PO BOX 127, HARPERS FERRY, IA 52146-0127
PO BOX 128, HARPERS FERRY, IA 52146-0128
PO BOX 129, HARPERS FERRY, IA 52146-0129
PO BOX 130, HARPERS FERRY, IA 52146-0130
PO BOX 131, HARPERS FERRY, IA 52146-0131
PO BOX 132, HARPERS FERRY, IA 52146-0132
PO BOX 133, HARPERS FERRY, IA 52146-0133
PO BOX 134, HARPERS FERRY, IA 52146-0134
PO BOX 135, HARPERS FERRY, IA 52146-0135
PO BOX 136, HARPERS FERRY, IA 52146-0136
PO BOX 137, HARPERS FERRY, IA 52146-0137
PO BOX 138, HARPERS FERRY, IA 52146-0138
PO BOX 139, HARPERS FERRY, IA 52146-0139
PO BOX 140, HARPERS FERRY, IA 52146-0140
PO BOX 141, HARPERS FERRY, IA 52146-0141
PO BOX 142, HARPERS FERRY, IA 52146-0142
PO BOX 143, HARPERS FERRY, IA 52146-0143
PO BOX 144, HARPERS FERRY, IA 52146-0144
PO BOX 145, HARPERS FERRY, IA 52146-0145
PO BOX 146, HARPERS FERRY, IA 52146-0146
PO BOX 147, HARPERS FERRY, IA 52146-0147
PO BOX 148, HARPERS FERRY, IA 52146-0148
PO BOX 149, HARPERS FERRY, IA 52146-0149
PO BOX 150, HARPERS FERRY, IA 52146-0150
PO BOX 151, HARPERS FERRY, IA 52146-0151
PO BOX 152, HARPERS FERRY, IA 52146-0152
PO BOX 153, HARPERS FERRY, IA 52146-0153
PO BOX 154, HARPERS FERRY, IA 52146-0154
PO BOX 155, HARPERS FERRY, IA 52146-0155
PO BOX 156, HARPERS FERRY, IA 52146-0156
PO BOX 157, HARPERS FERRY, IA 52146-0157
PO BOX 158, HARPERS FERRY, IA 52146-0158
PO BOX 159, HARPERS FERRY, IA 52146-0159
PO BOX 160, HARPERS FERRY, IA 52146-0160
PO BOX 161, HARPERS FERRY, IA 52146-0161
PO BOX 162, HARPERS FERRY, IA 52146-0162
PO BOX 163, HARPERS FERRY, IA 52146-0163
PO BOX 164, HARPERS FERRY, IA 52146-0164
PO BOX 165, HARPERS FERRY, IA 52146-0165
PO BOX 166, HARPERS FERRY, IA 52146-0166
PO BOX 167, HARPERS FERRY, IA 52146-0167
PO BOX 168, HARPERS FERRY, IA 52146-0168
PO BOX 169, HARPERS FERRY, IA 52146-0169
PO BOX 170, HARPERS FERRY, IA 52146-0170
PO BOX 171, HARPERS FERRY, IA 52146-0171
PO BOX 172, HARPERS FERRY, IA 52146-0172
PO BOX 173, HARPERS FERRY, IA 52146-0173
PO BOX 174, HARPERS FERRY, IA 52146-0174
PO BOX 175, HARPERS FERRY, IA 52146-0175
PO BOX 176, HARPERS FERRY, IA 52146-0176
PO BOX 177, HARPERS FERRY, IA 52146-0177
PO BOX 178, HARPERS FERRY, IA 52146-0178
PO BOX 179, HARPERS FERRY, IA 52146-0179
PO BOX 180, HARPERS FERRY, IA 52146-0180
PO BOX 181, HARPERS FERRY, IA 52146-0181
PO BOX 182, HARPERS FERRY, IA 52146-0182
PO BOX 183, HARPERS FERRY, IA 52146-0183
PO BOX 184, HARPERS FERRY, IA 52146-0184
PO BOX 185, HARPERS FERRY, IA 52146-0185
PO BOX 186, HARPERS FERRY, IA 52146-0186
PO BOX 187, HARPERS FERRY, IA 52146-0187
PO BOX 188, HARPERS FERRY, IA 52146-0188
PO BOX 189, HARPERS FERRY, IA 52146-0189
PO BOX 190, HARPERS FERRY, IA 52146-0190
PO BOX 191, HARPERS FERRY, IA 52146-0191
PO BOX 192, HARPERS FERRY, IA 52146-0192
PO BOX 193, HARPERS FERRY, IA 52146-0193
PO BOX 194, HARPERS FERRY, IA 52146-0194
PO BOX 195, HARPERS FERRY, IA 52146-0195
PO BOX 196, HARPERS FERRY, IA 52146-0196
PO BOX 197, HARPERS FERRY, IA 52146-0197
PO BOX 198, HARPERS FERRY, IA 52146-0198
PO BOX 199, HARPERS FERRY, IA 52146-0199
PO BOX 200, HARPERS FERRY, IA 52146-0200
PO BOX 201, HARPERS FERRY, IA 52146-0201
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