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 21, CASCADE LOCKS, OR 97014-0021
PO BOX 22, CASCADE LOCKS, OR 97014-0022
PO BOX 23, CASCADE LOCKS, OR 97014-0023
PO BOX 24, CASCADE LOCKS, OR 97014-0024
PO BOX 25, CASCADE LOCKS, OR 97014-0025
PO BOX 26, CASCADE LOCKS, OR 97014-0026
PO BOX 27, CASCADE LOCKS, OR 97014-0027
PO BOX 28, CASCADE LOCKS, OR 97014-0028
PO BOX 29, CASCADE LOCKS, OR 97014-0029
PO BOX 30, CASCADE LOCKS, OR 97014-0030
PO BOX 31, CASCADE LOCKS, OR 97014-0031
PO BOX 32, CASCADE LOCKS, OR 97014-0032
PO BOX 33, CASCADE LOCKS, OR 97014-0033
PO BOX 34, CASCADE LOCKS, OR 97014-0034
PO BOX 35, CASCADE LOCKS, OR 97014-0035
PO BOX 36, CASCADE LOCKS, OR 97014-0036
PO BOX 37, CASCADE LOCKS, OR 97014-0037
PO BOX 38, CASCADE LOCKS, OR 97014-0038
PO BOX 39, CASCADE LOCKS, OR 97014-0039
PO BOX 40, CASCADE LOCKS, OR 97014-0040
PO BOX 41, CASCADE LOCKS, OR 97014-0041
PO BOX 42, CASCADE LOCKS, OR 97014-0042
PO BOX 43, CASCADE LOCKS, OR 97014-0043
PO BOX 44, CASCADE LOCKS, OR 97014-0044
PO BOX 45, CASCADE LOCKS, OR 97014-0045
PO BOX 46, CASCADE LOCKS, OR 97014-0046
PO BOX 47, CASCADE LOCKS, OR 97014-0047
PO BOX 48, CASCADE LOCKS, OR 97014-0048
PO BOX 49, CASCADE LOCKS, OR 97014-0049
PO BOX 50, CASCADE LOCKS, OR 97014-0050
PO BOX 51, CASCADE LOCKS, OR 97014-0051
PO BOX 52, CASCADE LOCKS, OR 97014-0052
PO BOX 53, CASCADE LOCKS, OR 97014-0053
PO BOX 54, CASCADE LOCKS, OR 97014-0054
PO BOX 55, CASCADE LOCKS, OR 97014-0055
PO BOX 56, CASCADE LOCKS, OR 97014-0056
PO BOX 57, CASCADE LOCKS, OR 97014-0057
PO BOX 58, CASCADE LOCKS, OR 97014-0058
PO BOX 59, CASCADE LOCKS, OR 97014-0059
PO BOX 60, CASCADE LOCKS, OR 97014-0060
PO BOX 61, CASCADE LOCKS, OR 97014-0061
PO BOX 62, CASCADE LOCKS, OR 97014-0062
PO BOX 63, CASCADE LOCKS, OR 97014-0063
PO BOX 64, CASCADE LOCKS, OR 97014-0064
PO BOX 65, CASCADE LOCKS, OR 97014-0065
PO BOX 66, CASCADE LOCKS, OR 97014-0066
PO BOX 67, CASCADE LOCKS, OR 97014-0067
PO BOX 68, CASCADE LOCKS, OR 97014-0068
PO BOX 69, CASCADE LOCKS, OR 97014-0069
PO BOX 70, CASCADE LOCKS, OR 97014-0070
PO BOX 71, CASCADE LOCKS, OR 97014-0071
PO BOX 72, CASCADE LOCKS, OR 97014-0072
PO BOX 73, CASCADE LOCKS, OR 97014-0073
PO BOX 74, CASCADE LOCKS, OR 97014-0074
PO BOX 75, CASCADE LOCKS, OR 97014-0075
PO BOX 76, CASCADE LOCKS, OR 97014-0076
PO BOX 77, CASCADE LOCKS, OR 97014-0077
PO BOX 78, CASCADE LOCKS, OR 97014-0078
PO BOX 79, CASCADE LOCKS, OR 97014-0079
PO BOX 80, CASCADE LOCKS, OR 97014-0080
PO BOX 81, CASCADE LOCKS, OR 97014-0081
PO BOX 82, CASCADE LOCKS, OR 97014-0082
PO BOX 83, CASCADE LOCKS, OR 97014-0083
PO BOX 84, CASCADE LOCKS, OR 97014-0084
PO BOX 85, CASCADE LOCKS, OR 97014-0085
PO BOX 86, CASCADE LOCKS, OR 97014-0086
PO BOX 87, CASCADE LOCKS, OR 97014-0087
PO BOX 88, CASCADE LOCKS, OR 97014-0088
PO BOX 89, CASCADE LOCKS, OR 97014-0089
PO BOX 90, CASCADE LOCKS, OR 97014-0090
PO BOX 91, CASCADE LOCKS, OR 97014-0091
PO BOX 92, CASCADE LOCKS, OR 97014-0092
PO BOX 93, CASCADE LOCKS, OR 97014-0093
PO BOX 94, CASCADE LOCKS, OR 97014-0094
PO BOX 95, CASCADE LOCKS, OR 97014-0095
PO BOX 96, CASCADE LOCKS, OR 97014-0096
PO BOX 97, CASCADE LOCKS, OR 97014-0097
PO BOX 98, CASCADE LOCKS, OR 97014-0098
PO BOX 99, CASCADE LOCKS, OR 97014-0099
PO BOX 100, CASCADE LOCKS, OR 97014-0100
PO BOX 101, CASCADE LOCKS, OR 97014-0101
PO BOX 102, CASCADE LOCKS, OR 97014-0102
PO BOX 103, CASCADE LOCKS, OR 97014-0103
PO BOX 104, CASCADE LOCKS, OR 97014-0104
PO BOX 105, CASCADE LOCKS, OR 97014-0105
PO BOX 106, CASCADE LOCKS, OR 97014-0106
PO BOX 107, CASCADE LOCKS, OR 97014-0107
PO BOX 108, CASCADE LOCKS, OR 97014-0108
PO BOX 109, CASCADE LOCKS, OR 97014-0109
PO BOX 110, CASCADE LOCKS, OR 97014-0110
PO BOX 111, CASCADE LOCKS, OR 97014-0111
PO BOX 112, CASCADE LOCKS, OR 97014-0112
PO BOX 113, CASCADE LOCKS, OR 97014-0113
PO BOX 114, CASCADE LOCKS, OR 97014-0114
PO BOX 115, CASCADE LOCKS, OR 97014-0115
PO BOX 116, CASCADE LOCKS, OR 97014-0116
PO BOX 117, CASCADE LOCKS, OR 97014-0117
PO BOX 118, CASCADE LOCKS, OR 97014-0118
PO BOX 119, CASCADE LOCKS, OR 97014-0119
PO BOX 120, CASCADE LOCKS, OR 97014-0120
PO BOX 121, CASCADE LOCKS, OR 97014-0121
PO BOX 122, CASCADE LOCKS, OR 97014-0122
PO BOX 123, CASCADE LOCKS, OR 97014-0123
PO BOX 124, CASCADE LOCKS, OR 97014-0124
PO BOX 125, CASCADE LOCKS, OR 97014-0125
PO BOX 126, CASCADE LOCKS, OR 97014-0126
PO BOX 127, CASCADE LOCKS, OR 97014-0127
PO BOX 128, CASCADE LOCKS, OR 97014-0128
PO BOX 129, CASCADE LOCKS, OR 97014-0129
PO BOX 130, CASCADE LOCKS, OR 97014-0130
PO BOX 131, CASCADE LOCKS, OR 97014-0131
PO BOX 132, CASCADE LOCKS, OR 97014-0132
PO BOX 133, CASCADE LOCKS, OR 97014-0133
PO BOX 134, CASCADE LOCKS, OR 97014-0134
PO BOX 135, CASCADE LOCKS, OR 97014-0135
PO BOX 136, CASCADE LOCKS, OR 97014-0136
PO BOX 137, CASCADE LOCKS, OR 97014-0137
PO BOX 138, CASCADE LOCKS, OR 97014-0138
PO BOX 139, CASCADE LOCKS, OR 97014-0139
PO BOX 140, CASCADE LOCKS, OR 97014-0140
PO BOX 141, CASCADE LOCKS, OR 97014-0141
PO BOX 142, CASCADE LOCKS, OR 97014-0142
PO BOX 143, CASCADE LOCKS, OR 97014-0143
PO BOX 144, CASCADE LOCKS, OR 97014-0144
PO BOX 145, CASCADE LOCKS, OR 97014-0145
PO BOX 146, CASCADE LOCKS, OR 97014-0146
PO BOX 147, CASCADE LOCKS, OR 97014-0147
PO BOX 148, CASCADE LOCKS, OR 97014-0148
PO BOX 149, CASCADE LOCKS, OR 97014-0149
PO BOX 150, CASCADE LOCKS, OR 97014-0150
PO BOX 151, CASCADE LOCKS, OR 97014-0151
PO BOX 152, CASCADE LOCKS, OR 97014-0152
PO BOX 153, CASCADE LOCKS, OR 97014-0153
PO BOX 154, CASCADE LOCKS, OR 97014-0154
PO BOX 155, CASCADE LOCKS, OR 97014-0155
PO BOX 156, CASCADE LOCKS, OR 97014-0156
PO BOX 157, CASCADE LOCKS, OR 97014-0157
PO BOX 158, CASCADE LOCKS, OR 97014-0158
PO BOX 159, CASCADE LOCKS, OR 97014-0159
PO BOX 160, CASCADE LOCKS, OR 97014-0160
PO BOX 161, CASCADE LOCKS, OR 97014-0161
PO BOX 162, CASCADE LOCKS, OR 97014-0162
PO BOX 163, CASCADE LOCKS, OR 97014-0163
PO BOX 164, CASCADE LOCKS, OR 97014-0164
PO BOX 165, CASCADE LOCKS, OR 97014-0165
PO BOX 166, CASCADE LOCKS, OR 97014-0166
PO BOX 167, CASCADE LOCKS, OR 97014-0167
PO BOX 168, CASCADE LOCKS, OR 97014-0168
PO BOX 169, CASCADE LOCKS, OR 97014-0169
PO BOX 170, CASCADE LOCKS, OR 97014-0170
PO BOX 171, CASCADE LOCKS, OR 97014-0171
PO BOX 172, CASCADE LOCKS, OR 97014-0172
PO BOX 173, CASCADE LOCKS, OR 97014-0173
PO BOX 174, CASCADE LOCKS, OR 97014-0174
PO BOX 175, CASCADE LOCKS, OR 97014-0175
PO BOX 176, CASCADE LOCKS, OR 97014-0176
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