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, REPUBLIC, WA 99166-0001
PO BOX 2, REPUBLIC, WA 99166-0002
PO BOX 3, REPUBLIC, WA 99166-0003
PO BOX 4, REPUBLIC, WA 99166-0004
PO BOX 5, REPUBLIC, WA 99166-0005
PO BOX 6, REPUBLIC, WA 99166-0006
PO BOX 7, REPUBLIC, WA 99166-0007
PO BOX 8, REPUBLIC, WA 99166-0008
PO BOX 9, REPUBLIC, WA 99166-0009
PO BOX 10, REPUBLIC, WA 99166-0010
PO BOX 11, REPUBLIC, WA 99166-0011
PO BOX 12, REPUBLIC, WA 99166-0012
PO BOX 13, REPUBLIC, WA 99166-0013
PO BOX 14, REPUBLIC, WA 99166-0014
PO BOX 15, REPUBLIC, WA 99166-0015
PO BOX 16, REPUBLIC, WA 99166-0016
PO BOX 17, REPUBLIC, WA 99166-0017
PO BOX 18, REPUBLIC, WA 99166-0018
PO BOX 19, REPUBLIC, WA 99166-0019
PO BOX 20, REPUBLIC, WA 99166-0020
PO BOX 21, REPUBLIC, WA 99166-0021
PO BOX 22, REPUBLIC, WA 99166-0022
PO BOX 23, REPUBLIC, WA 99166-0023
PO BOX 24, REPUBLIC, WA 99166-0024
PO BOX 25, REPUBLIC, WA 99166-0025
PO BOX 26, REPUBLIC, WA 99166-0026
PO BOX 27, REPUBLIC, WA 99166-0027
PO BOX 28, REPUBLIC, WA 99166-0028
PO BOX 29, REPUBLIC, WA 99166-0029
PO BOX 30, REPUBLIC, WA 99166-0030
PO BOX 31, REPUBLIC, WA 99166-0031
PO BOX 32, REPUBLIC, WA 99166-0032
PO BOX 33, REPUBLIC, WA 99166-0033
PO BOX 34, REPUBLIC, WA 99166-0034
PO BOX 35, REPUBLIC, WA 99166-0035
PO BOX 36, REPUBLIC, WA 99166-0036
PO BOX 37, REPUBLIC, WA 99166-0037
PO BOX 38, REPUBLIC, WA 99166-0038
PO BOX 39, REPUBLIC, WA 99166-0039
PO BOX 40, REPUBLIC, WA 99166-0040
PO BOX 41, REPUBLIC, WA 99166-0041
PO BOX 42, REPUBLIC, WA 99166-0042
PO BOX 43, REPUBLIC, WA 99166-0043
PO BOX 44, REPUBLIC, WA 99166-0044
PO BOX 45, REPUBLIC, WA 99166-0045
PO BOX 46, REPUBLIC, WA 99166-0046
PO BOX 47, REPUBLIC, WA 99166-0047
PO BOX 48, REPUBLIC, WA 99166-0048
PO BOX 49, REPUBLIC, WA 99166-0049
PO BOX 50, REPUBLIC, WA 99166-0050
PO BOX 51, REPUBLIC, WA 99166-0051
PO BOX 52, REPUBLIC, WA 99166-0052
PO BOX 53, REPUBLIC, WA 99166-0053
PO BOX 54, REPUBLIC, WA 99166-0054
PO BOX 55, REPUBLIC, WA 99166-0055
PO BOX 56, REPUBLIC, WA 99166-0056
PO BOX 57, REPUBLIC, WA 99166-0057
PO BOX 58, REPUBLIC, WA 99166-0058
PO BOX 59, REPUBLIC, WA 99166-0059
PO BOX 60, REPUBLIC, WA 99166-0060
PO BOX 61, REPUBLIC, WA 99166-0061
PO BOX 62, REPUBLIC, WA 99166-0062
PO BOX 63, REPUBLIC, WA 99166-0063
PO BOX 64, REPUBLIC, WA 99166-0064
PO BOX 65, REPUBLIC, WA 99166-0065
PO BOX 66, REPUBLIC, WA 99166-0066
PO BOX 67, REPUBLIC, WA 99166-0067
PO BOX 68, REPUBLIC, WA 99166-0068
PO BOX 69, REPUBLIC, WA 99166-0069
PO BOX 70, REPUBLIC, WA 99166-0070
PO BOX 71, REPUBLIC, WA 99166-0071
PO BOX 72, REPUBLIC, WA 99166-0072
PO BOX 73, REPUBLIC, WA 99166-0073
PO BOX 74, REPUBLIC, WA 99166-0074
PO BOX 75, REPUBLIC, WA 99166-0075
PO BOX 76, REPUBLIC, WA 99166-0076
PO BOX 77, REPUBLIC, WA 99166-0077
PO BOX 78, REPUBLIC, WA 99166-0078
PO BOX 79, REPUBLIC, WA 99166-0079
PO BOX 80, REPUBLIC, WA 99166-0080
PO BOX 81, REPUBLIC, WA 99166-0081
PO BOX 82, REPUBLIC, WA 99166-0082
PO BOX 83, REPUBLIC, WA 99166-0083
PO BOX 84, REPUBLIC, WA 99166-0084
PO BOX 85, REPUBLIC, WA 99166-0085
PO BOX 86, REPUBLIC, WA 99166-0086
PO BOX 87, REPUBLIC, WA 99166-0087
PO BOX 88, REPUBLIC, WA 99166-0088
PO BOX 89, REPUBLIC, WA 99166-0089
PO BOX 90, REPUBLIC, WA 99166-0090
PO BOX 91, REPUBLIC, WA 99166-0091
PO BOX 92, REPUBLIC, WA 99166-0092
PO BOX 93, REPUBLIC, WA 99166-0093
PO BOX 94, REPUBLIC, WA 99166-0094
PO BOX 95, REPUBLIC, WA 99166-0095
PO BOX 96, REPUBLIC, WA 99166-0096
PO BOX 97, REPUBLIC, WA 99166-0097
PO BOX 98, REPUBLIC, WA 99166-0098
PO BOX 99, REPUBLIC, WA 99166-0099
PO BOX 100, REPUBLIC, WA 99166-0100
PO BOX 101, REPUBLIC, WA 99166-0101
PO BOX 102, REPUBLIC, WA 99166-0102
PO BOX 103, REPUBLIC, WA 99166-0103
PO BOX 104, REPUBLIC, WA 99166-0104
PO BOX 105, REPUBLIC, WA 99166-0105
PO BOX 106, REPUBLIC, WA 99166-0106
PO BOX 107, REPUBLIC, WA 99166-0107
PO BOX 108, REPUBLIC, WA 99166-0108
PO BOX 109, REPUBLIC, WA 99166-0109
PO BOX 110, REPUBLIC, WA 99166-0110
PO BOX 111, REPUBLIC, WA 99166-0111
PO BOX 112, REPUBLIC, WA 99166-0112
PO BOX 113, REPUBLIC, WA 99166-0113
PO BOX 114, REPUBLIC, WA 99166-0114
PO BOX 115, REPUBLIC, WA 99166-0115
PO BOX 116, REPUBLIC, WA 99166-0116
PO BOX 117, REPUBLIC, WA 99166-0117
PO BOX 118, REPUBLIC, WA 99166-0118
PO BOX 119, REPUBLIC, WA 99166-0119
PO BOX 120, REPUBLIC, WA 99166-0120
PO BOX 121, REPUBLIC, WA 99166-0121
PO BOX 122, REPUBLIC, WA 99166-0122
PO BOX 123, REPUBLIC, WA 99166-0123
PO BOX 124, REPUBLIC, WA 99166-0124
PO BOX 125, REPUBLIC, WA 99166-0125
PO BOX 126, REPUBLIC, WA 99166-0126
PO BOX 127, REPUBLIC, WA 99166-0127
PO BOX 128, REPUBLIC, WA 99166-0128
PO BOX 129, REPUBLIC, WA 99166-0129
PO BOX 130, REPUBLIC, WA 99166-0130
PO BOX 131, REPUBLIC, WA 99166-0131
PO BOX 132, REPUBLIC, WA 99166-0132
PO BOX 133, REPUBLIC, WA 99166-0133
PO BOX 134, REPUBLIC, WA 99166-0134
PO BOX 135, REPUBLIC, WA 99166-0135
PO BOX 136, REPUBLIC, WA 99166-0136
PO BOX 137, REPUBLIC, WA 99166-0137
PO BOX 138, REPUBLIC, WA 99166-0138
PO BOX 139, REPUBLIC, WA 99166-0139
PO BOX 140, REPUBLIC, WA 99166-0140
PO BOX 141, REPUBLIC, WA 99166-0141
PO BOX 142, REPUBLIC, WA 99166-0142
PO BOX 143, REPUBLIC, WA 99166-0143
PO BOX 144, REPUBLIC, WA 99166-0144
PO BOX 145, REPUBLIC, WA 99166-0145
PO BOX 146, REPUBLIC, WA 99166-0146
PO BOX 147, REPUBLIC, WA 99166-0147
PO BOX 148, REPUBLIC, WA 99166-0148
PO BOX 149, REPUBLIC, WA 99166-0149
PO BOX 150, REPUBLIC, WA 99166-0150
PO BOX 151, REPUBLIC, WA 99166-0151
PO BOX 152, REPUBLIC, WA 99166-0152
PO BOX 153, REPUBLIC, WA 99166-0153
PO BOX 154, REPUBLIC, WA 99166-0154
PO BOX 155, REPUBLIC, WA 99166-0155
PO BOX 156, REPUBLIC, WA 99166-0156
PO BOX 157, REPUBLIC, WA 99166-0157
PO BOX 158, REPUBLIC, WA 99166-0158
PO BOX 159, REPUBLIC, WA 99166-0159
PO BOX 160, REPUBLIC, WA 99166-0160
PO BOX 161, REPUBLIC, WA 99166-0161
PO BOX 162, REPUBLIC, WA 99166-0162
PO BOX 163, REPUBLIC, WA 99166-0163
PO BOX 164, REPUBLIC, WA 99166-0164
PO BOX 165, REPUBLIC, WA 99166-0165
PO BOX 166, REPUBLIC, WA 99166-0166
PO BOX 167, REPUBLIC, WA 99166-0167
PO BOX 168, REPUBLIC, WA 99166-0168
PO BOX 169, REPUBLIC, WA 99166-0169
PO BOX 170, REPUBLIC, WA 99166-0170
PO BOX 171, REPUBLIC, WA 99166-0171
PO BOX 172, REPUBLIC, WA 99166-0172
PO BOX 173, REPUBLIC, WA 99166-0173
PO BOX 174, REPUBLIC, WA 99166-0174
PO BOX 175, REPUBLIC, WA 99166-0175
PO BOX 176, REPUBLIC, WA 99166-0176
PO BOX 177, REPUBLIC, WA 99166-0177
PO BOX 178, REPUBLIC, WA 99166-0178
PO BOX 179, REPUBLIC, WA 99166-0179
PO BOX 180, REPUBLIC, WA 99166-0180
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