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 19, HARPER, OR 97906-0019
PO BOX 20, HARPER, OR 97906-0020
PO BOX 21, HARPER, OR 97906-0021
PO BOX 22, HARPER, OR 97906-0022
PO BOX 23, HARPER, OR 97906-0023
PO BOX 24, HARPER, OR 97906-0024
PO BOX 25, HARPER, OR 97906-0025
PO BOX 26, HARPER, OR 97906-0026
PO BOX 27, HARPER, OR 97906-0027
PO BOX 28, HARPER, OR 97906-0028
PO BOX 29, HARPER, OR 97906-0029
PO BOX 30, HARPER, OR 97906-0030
PO BOX 31, HARPER, OR 97906-0031
PO BOX 32, HARPER, OR 97906-0032
PO BOX 33, HARPER, OR 97906-0033
PO BOX 34, HARPER, OR 97906-0034
PO BOX 35, HARPER, OR 97906-0035
PO BOX 36, HARPER, OR 97906-0036
PO BOX 37, HARPER, OR 97906-0037
PO BOX 38, HARPER, OR 97906-0038
PO BOX 39, HARPER, OR 97906-0039
PO BOX 40, HARPER, OR 97906-0040
PO BOX 41, HARPER, OR 97906-0041
PO BOX 42, HARPER, OR 97906-0042
PO BOX 43, HARPER, OR 97906-0043
PO BOX 44, HARPER, OR 97906-0044
PO BOX 45, HARPER, OR 97906-0045
PO BOX 46, HARPER, OR 97906-0046
PO BOX 47, HARPER, OR 97906-0047
PO BOX 48, HARPER, OR 97906-0048
PO BOX 49, HARPER, OR 97906-0049
PO BOX 50, HARPER, OR 97906-0050
PO BOX 51, HARPER, OR 97906-0051
PO BOX 52, HARPER, OR 97906-0052
PO BOX 53, HARPER, OR 97906-0053
PO BOX 54, HARPER, OR 97906-0054
PO BOX 55, HARPER, OR 97906-0055
PO BOX 56, HARPER, OR 97906-0056
PO BOX 57, HARPER, OR 97906-0057
PO BOX 58, HARPER, OR 97906-0058
PO BOX 59, HARPER, OR 97906-0059
PO BOX 60, HARPER, OR 97906-0060
PO BOX 61, HARPER, OR 97906-0061
PO BOX 62, HARPER, OR 97906-0062
PO BOX 63, HARPER, OR 97906-0063
PO BOX 64, HARPER, OR 97906-0064
PO BOX 65, HARPER, OR 97906-0065
PO BOX 66, HARPER, OR 97906-0066
PO BOX 67, HARPER, OR 97906-0067
PO BOX 68, HARPER, OR 97906-0068
PO BOX 69, HARPER, OR 97906-0069
PO BOX 70, HARPER, OR 97906-0070
PO BOX 71, HARPER, OR 97906-0071
PO BOX 72, HARPER, OR 97906-0072
PO BOX 73, HARPER, OR 97906-0073
PO BOX 74, HARPER, OR 97906-0074
PO BOX 75, HARPER, OR 97906-0075
PO BOX 76, HARPER, OR 97906-0076
PO BOX 77, HARPER, OR 97906-0077
PO BOX 78, HARPER, OR 97906-0078
PO BOX 79, HARPER, OR 97906-0079
PO BOX 80, HARPER, OR 97906-0080
PO BOX 81, HARPER, OR 97906-0081
PO BOX 82, HARPER, OR 97906-0082
PO BOX 83, HARPER, OR 97906-0083
PO BOX 84, HARPER, OR 97906-0084
PO BOX 85, HARPER, OR 97906-0085
PO BOX 86, HARPER, OR 97906-0086
PO BOX 87, HARPER, OR 97906-0087
PO BOX 88, HARPER, OR 97906-0088
PO BOX 89, HARPER, OR 97906-0089
PO BOX 90, HARPER, OR 97906-0090
PO BOX 91, HARPER, OR 97906-0091
PO BOX 92, HARPER, OR 97906-0092
PO BOX 93, HARPER, OR 97906-0093
PO BOX 94, HARPER, OR 97906-0094
PO BOX 95, HARPER, OR 97906-0095
PO BOX 96, HARPER, OR 97906-0096
PO BOX 97, HARPER, OR 97906-0097
PO BOX 98, HARPER, OR 97906-0098
PO BOX 99, HARPER, OR 97906-0099
PO BOX 100, HARPER, OR 97906-0100
PO BOX 101, HARPER, OR 97906-0101
PO BOX 102, HARPER, OR 97906-0102
PO BOX 103, HARPER, OR 97906-0103
PO BOX 104, HARPER, OR 97906-0104
PO BOX 105, HARPER, OR 97906-0105
PO BOX 106, HARPER, OR 97906-0106
PO BOX 107, HARPER, OR 97906-0107
PO BOX 108, HARPER, OR 97906-0108
PO BOX 109, HARPER, OR 97906-0109
PO BOX 110, HARPER, OR 97906-0110
PO BOX 111, HARPER, OR 97906-0111
PO BOX 112, HARPER, OR 97906-0112
PO BOX 113, HARPER, OR 97906-0113
PO BOX 114, HARPER, OR 97906-0114
PO BOX 115, HARPER, OR 97906-0115
PO BOX 116, HARPER, OR 97906-0116
PO BOX 117, HARPER, OR 97906-0117
PO BOX 118, HARPER, OR 97906-0118
PO BOX 119, HARPER, OR 97906-0119
PO BOX 120, HARPER, OR 97906-0120
PO BOX 121, HARPER, OR 97906-0121
PO BOX 122, HARPER, OR 97906-0122
PO BOX 123, HARPER, OR 97906-0123
PO BOX 124, HARPER, OR 97906-0124
PO BOX 125, HARPER, OR 97906-0125
PO BOX 126, HARPER, OR 97906-0126
PO BOX 127, HARPER, OR 97906-0127
PO BOX 128, HARPER, OR 97906-0128
PO BOX 129, HARPER, OR 97906-0129
PO BOX 130, HARPER, OR 97906-0130
PO BOX 131, HARPER, OR 97906-0131
PO BOX 132, HARPER, OR 97906-0132
PO BOX 133, HARPER, OR 97906-0133
PO BOX 134, HARPER, OR 97906-0134
PO BOX 135, HARPER, OR 97906-0135
PO BOX 136, HARPER, OR 97906-0136
PO BOX 137, HARPER, OR 97906-0137
PO BOX 138, HARPER, OR 97906-0138
PO BOX 139, HARPER, OR 97906-0139
PO BOX 140, HARPER, OR 97906-0140
PO BOX 141, HARPER, OR 97906-0141
PO BOX 142, HARPER, OR 97906-0142
PO BOX 143, HARPER, OR 97906-0143
PO BOX 144, HARPER, OR 97906-0144
PO BOX 145, HARPER, OR 97906-0145
PO BOX 146, HARPER, OR 97906-0146
PO BOX 147, HARPER, OR 97906-0147
PO BOX 148, HARPER, OR 97906-0148
PO BOX 149, HARPER, OR 97906-0149
PO BOX 150, HARPER, OR 97906-0150
PO BOX 151, HARPER, OR 97906-0151
PO BOX 152, HARPER, OR 97906-0152
PO BOX 153, HARPER, OR 97906-0153
PO BOX 154, HARPER, OR 97906-0154
PO BOX 155, HARPER, OR 97906-0155
PO BOX 156, HARPER, OR 97906-0156
PO BOX 157, HARPER, OR 97906-0157
PO BOX 158, HARPER, OR 97906-0158
PO BOX 159, HARPER, OR 97906-0159
PO BOX 160, HARPER, OR 97906-0160
PO BOX 161, HARPER, OR 97906-0161
PO BOX 162, HARPER, OR 97906-0162
PO BOX 163, HARPER, OR 97906-0163
PO BOX 164, HARPER, OR 97906-0164
PO BOX 165, HARPER, OR 97906-0165
PO BOX 166, HARPER, OR 97906-0166
PO BOX 167, HARPER, OR 97906-0167
PO BOX 168, HARPER, OR 97906-0168
PO BOX 169, HARPER, OR 97906-0169
PO BOX 170, HARPER, OR 97906-0170
PO BOX 171, HARPER, OR 97906-0171
PO BOX 172, HARPER, OR 97906-0172
PO BOX 173, HARPER, OR 97906-0173
PO BOX 174, HARPER, OR 97906-0174
PO BOX 175, HARPER, OR 97906-0175
PO BOX 176, HARPER, OR 97906-0176
PO BOX 177, HARPER, OR 97906-0177
PO BOX 178, HARPER, OR 97906-0178
PO BOX 179, HARPER, OR 97906-0179
PO BOX 180, HARPER, OR 97906-0180
PO BOX 181, HARPER, OR 97906-0181
PO BOX 182, HARPER, OR 97906-0182
PO BOX 183, HARPER, OR 97906-0183
PO BOX 184, HARPER, OR 97906-0184
PO BOX 185, HARPER, OR 97906-0185
PO BOX 186, HARPER, OR 97906-0186
PO BOX 187, HARPER, OR 97906-0187
PO BOX 188, HARPER, OR 97906-0188
PO BOX 189, HARPER, OR 97906-0189
PO BOX 190, HARPER, OR 97906-0190
PO BOX 191, HARPER, OR 97906-0191
PO BOX 192, HARPER, OR 97906-0192
PO BOX 193, HARPER, OR 97906-0193
PO BOX 194, HARPER, OR 97906-0194
PO BOX 195, HARPER, OR 97906-0195
PO BOX 196, HARPER, OR 97906-0196
PO BOX 197, HARPER, OR 97906-0197
PO BOX 198, HARPER, OR 97906-0198
PO BOX 199, HARPER, OR 97906-0199
PO BOX 200, HARPER, OR 97906-0200
PO BOX 201, HARPER, OR 97906-0201
PO BOX 202, HARPER, OR 97906-0202
PO BOX 203, HARPER, OR 97906-0203
PO BOX 204, HARPER, OR 97906-0204
PO BOX 205, HARPER, OR 97906-0205
PO BOX 206, HARPER, OR 97906-0206
PO BOX 207, HARPER, OR 97906-0207
PO BOX 208, HARPER, OR 97906-0208
PO BOX 209, HARPER, OR 97906-0209
PO BOX 210, HARPER, OR 97906-0210
PO BOX 211, HARPER, OR 97906-0211
PO BOX 212, HARPER, OR 97906-0212
PO BOX 213, HARPER, OR 97906-0213
PO BOX 214, HARPER, OR 97906-0214
PO BOX 215, HARPER, OR 97906-0215
PO BOX 216, HARPER, OR 97906-0216
PO BOX 217, HARPER, OR 97906-0217
PO BOX 218, HARPER, OR 97906-0218
PO BOX 219, HARPER, OR 97906-0219
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