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, CAMBRIDGE, ID 83610-0001
PO BOX 2, CAMBRIDGE, ID 83610-0002
PO BOX 3, CAMBRIDGE, ID 83610-0003
PO BOX 4, CAMBRIDGE, ID 83610-0004
PO BOX 5, CAMBRIDGE, ID 83610-0005
PO BOX 6, CAMBRIDGE, ID 83610-0006
PO BOX 7, CAMBRIDGE, ID 83610-0007
PO BOX 8, CAMBRIDGE, ID 83610-0008
PO BOX 9, CAMBRIDGE, ID 83610-0009
PO BOX 10, CAMBRIDGE, ID 83610-0010
PO BOX 11, CAMBRIDGE, ID 83610-0011
PO BOX 12, CAMBRIDGE, ID 83610-0012
PO BOX 13, CAMBRIDGE, ID 83610-0013
PO BOX 14, CAMBRIDGE, ID 83610-0014
PO BOX 15, CAMBRIDGE, ID 83610-0015
PO BOX 16, CAMBRIDGE, ID 83610-0016
PO BOX 17, CAMBRIDGE, ID 83610-0017
PO BOX 18, CAMBRIDGE, ID 83610-0018
PO BOX 19, CAMBRIDGE, ID 83610-0019
PO BOX 20, CAMBRIDGE, ID 83610-0020
PO BOX 21, CAMBRIDGE, ID 83610-0021
PO BOX 22, CAMBRIDGE, ID 83610-0022
PO BOX 23, CAMBRIDGE, ID 83610-0023
PO BOX 24, CAMBRIDGE, ID 83610-0024
PO BOX 25, CAMBRIDGE, ID 83610-0025
PO BOX 26, CAMBRIDGE, ID 83610-0026
PO BOX 27, CAMBRIDGE, ID 83610-0027
PO BOX 28, CAMBRIDGE, ID 83610-0028
PO BOX 29, CAMBRIDGE, ID 83610-0029
PO BOX 30, CAMBRIDGE, ID 83610-0030
PO BOX 31, CAMBRIDGE, ID 83610-0031
PO BOX 32, CAMBRIDGE, ID 83610-0032
PO BOX 33, CAMBRIDGE, ID 83610-0033
PO BOX 34, CAMBRIDGE, ID 83610-0034
PO BOX 35, CAMBRIDGE, ID 83610-0035
PO BOX 36, CAMBRIDGE, ID 83610-0036
PO BOX 37, CAMBRIDGE, ID 83610-0037
PO BOX 38, CAMBRIDGE, ID 83610-0038
PO BOX 39, CAMBRIDGE, ID 83610-0039
PO BOX 40, CAMBRIDGE, ID 83610-0040
PO BOX 41, CAMBRIDGE, ID 83610-0041
PO BOX 42, CAMBRIDGE, ID 83610-0042
PO BOX 43, CAMBRIDGE, ID 83610-0043
PO BOX 44, CAMBRIDGE, ID 83610-0044
PO BOX 45, CAMBRIDGE, ID 83610-0045
PO BOX 46, CAMBRIDGE, ID 83610-0046
PO BOX 47, CAMBRIDGE, ID 83610-0047
PO BOX 48, CAMBRIDGE, ID 83610-0048
PO BOX 49, CAMBRIDGE, ID 83610-0049
PO BOX 50, CAMBRIDGE, ID 83610-0050
PO BOX 51, CAMBRIDGE, ID 83610-0051
PO BOX 52, CAMBRIDGE, ID 83610-0052
PO BOX 53, CAMBRIDGE, ID 83610-0053
PO BOX 54, CAMBRIDGE, ID 83610-0054
PO BOX 55, CAMBRIDGE, ID 83610-0055
PO BOX 56, CAMBRIDGE, ID 83610-0056
PO BOX 57, CAMBRIDGE, ID 83610-0057
PO BOX 58, CAMBRIDGE, ID 83610-0058
PO BOX 59, CAMBRIDGE, ID 83610-0059
PO BOX 60, CAMBRIDGE, ID 83610-0060
PO BOX 61, CAMBRIDGE, ID 83610-0061
PO BOX 62, CAMBRIDGE, ID 83610-0062
PO BOX 63, CAMBRIDGE, ID 83610-0063
PO BOX 64, CAMBRIDGE, ID 83610-0064
PO BOX 65, CAMBRIDGE, ID 83610-0065
PO BOX 66, CAMBRIDGE, ID 83610-0066
PO BOX 67, CAMBRIDGE, ID 83610-0067
PO BOX 68, CAMBRIDGE, ID 83610-0068
PO BOX 69, CAMBRIDGE, ID 83610-0069
PO BOX 70, CAMBRIDGE, ID 83610-0070
PO BOX 71, CAMBRIDGE, ID 83610-0071
PO BOX 72, CAMBRIDGE, ID 83610-0072
PO BOX 73, CAMBRIDGE, ID 83610-0073
PO BOX 74, CAMBRIDGE, ID 83610-0074
PO BOX 75, CAMBRIDGE, ID 83610-0075
PO BOX 76, CAMBRIDGE, ID 83610-0076
PO BOX 77, CAMBRIDGE, ID 83610-0077
PO BOX 78, CAMBRIDGE, ID 83610-0078
PO BOX 79, CAMBRIDGE, ID 83610-0079
PO BOX 80, CAMBRIDGE, ID 83610-0080
PO BOX 81, CAMBRIDGE, ID 83610-0081
PO BOX 82, CAMBRIDGE, ID 83610-0082
PO BOX 83, CAMBRIDGE, ID 83610-0083
PO BOX 84, CAMBRIDGE, ID 83610-0084
PO BOX 85, CAMBRIDGE, ID 83610-0085
PO BOX 86, CAMBRIDGE, ID 83610-0086
PO BOX 87, CAMBRIDGE, ID 83610-0087
PO BOX 88, CAMBRIDGE, ID 83610-0088
PO BOX 89, CAMBRIDGE, ID 83610-0089
PO BOX 90, CAMBRIDGE, ID 83610-0090
PO BOX 91, CAMBRIDGE, ID 83610-0091
PO BOX 92, CAMBRIDGE, ID 83610-0092
PO BOX 93, CAMBRIDGE, ID 83610-0093
PO BOX 94, CAMBRIDGE, ID 83610-0094
PO BOX 95, CAMBRIDGE, ID 83610-0095
PO BOX 96, CAMBRIDGE, ID 83610-0096
PO BOX 97, CAMBRIDGE, ID 83610-0097
PO BOX 98, CAMBRIDGE, ID 83610-0098
PO BOX 99, CAMBRIDGE, ID 83610-0099
PO BOX 100, CAMBRIDGE, ID 83610-0100
PO BOX 101, CAMBRIDGE, ID 83610-0101
PO BOX 102, CAMBRIDGE, ID 83610-0102
PO BOX 103, CAMBRIDGE, ID 83610-0103
PO BOX 104, CAMBRIDGE, ID 83610-0104
PO BOX 105, CAMBRIDGE, ID 83610-0105
PO BOX 106, CAMBRIDGE, ID 83610-0106
PO BOX 107, CAMBRIDGE, ID 83610-0107
PO BOX 108, CAMBRIDGE, ID 83610-0108
PO BOX 109, CAMBRIDGE, ID 83610-0109
PO BOX 110, CAMBRIDGE, ID 83610-0110
PO BOX 111, CAMBRIDGE, ID 83610-0111
PO BOX 112, CAMBRIDGE, ID 83610-0112
PO BOX 113, CAMBRIDGE, ID 83610-0113
PO BOX 114, CAMBRIDGE, ID 83610-0114
PO BOX 115, CAMBRIDGE, ID 83610-0115
PO BOX 116, CAMBRIDGE, ID 83610-0116
PO BOX 117, CAMBRIDGE, ID 83610-0117
PO BOX 118, CAMBRIDGE, ID 83610-0118
PO BOX 119, CAMBRIDGE, ID 83610-0119
PO BOX 120, CAMBRIDGE, ID 83610-0120
PO BOX 121, CAMBRIDGE, ID 83610-0121
PO BOX 122, CAMBRIDGE, ID 83610-0122
PO BOX 123, CAMBRIDGE, ID 83610-0123
PO BOX 124, CAMBRIDGE, ID 83610-0124
PO BOX 125, CAMBRIDGE, ID 83610-0125
PO BOX 126, CAMBRIDGE, ID 83610-0126
PO BOX 127, CAMBRIDGE, ID 83610-0127
PO BOX 128, CAMBRIDGE, ID 83610-0128
PO BOX 129, CAMBRIDGE, ID 83610-0129
PO BOX 130, CAMBRIDGE, ID 83610-0130
PO BOX 131, CAMBRIDGE, ID 83610-0131
PO BOX 132, CAMBRIDGE, ID 83610-0132
PO BOX 133, CAMBRIDGE, ID 83610-0133
PO BOX 134, CAMBRIDGE, ID 83610-0134
PO BOX 135, CAMBRIDGE, ID 83610-0135
PO BOX 136, CAMBRIDGE, ID 83610-0136
PO BOX 137, CAMBRIDGE, ID 83610-0137
PO BOX 138, CAMBRIDGE, ID 83610-0138
PO BOX 139, CAMBRIDGE, ID 83610-0139
PO BOX 140, CAMBRIDGE, ID 83610-0140
PO BOX 141, CAMBRIDGE, ID 83610-0141
PO BOX 142, CAMBRIDGE, ID 83610-0142
PO BOX 143, CAMBRIDGE, ID 83610-0143
PO BOX 144, CAMBRIDGE, ID 83610-0144
PO BOX 145, CAMBRIDGE, ID 83610-0145
PO BOX 146, CAMBRIDGE, ID 83610-0146
PO BOX 147, CAMBRIDGE, ID 83610-0147
PO BOX 148, CAMBRIDGE, ID 83610-0148
PO BOX 149, CAMBRIDGE, ID 83610-0149
PO BOX 150, CAMBRIDGE, ID 83610-0150
PO BOX 151, CAMBRIDGE, ID 83610-0151
PO BOX 152, CAMBRIDGE, ID 83610-0152
PO BOX 153, CAMBRIDGE, ID 83610-0153
PO BOX 154, CAMBRIDGE, ID 83610-0154
PO BOX 155, CAMBRIDGE, ID 83610-0155
PO BOX 156, CAMBRIDGE, ID 83610-0156
PO BOX 157, CAMBRIDGE, ID 83610-0157
PO BOX 158, CAMBRIDGE, ID 83610-0158
PO BOX 159, CAMBRIDGE, ID 83610-0159
PO BOX 160, CAMBRIDGE, ID 83610-0160
PO BOX 161, CAMBRIDGE, ID 83610-0161
PO BOX 162, CAMBRIDGE, ID 83610-0162
PO BOX 163, CAMBRIDGE, ID 83610-0163
PO BOX 164, CAMBRIDGE, ID 83610-0164
PO BOX 165, CAMBRIDGE, ID 83610-0165
PO BOX 166, CAMBRIDGE, ID 83610-0166
PO BOX 167, CAMBRIDGE, ID 83610-0167
PO BOX 168, CAMBRIDGE, ID 83610-0168
PO BOX 169, CAMBRIDGE, ID 83610-0169
PO BOX 170, CAMBRIDGE, ID 83610-0170
PO BOX 171, CAMBRIDGE, ID 83610-0171
PO BOX 172, CAMBRIDGE, ID 83610-0172
PO BOX 173, CAMBRIDGE, ID 83610-0173
PO BOX 174, CAMBRIDGE, ID 83610-0174
PO BOX 175, CAMBRIDGE, ID 83610-0175
PO BOX 176, CAMBRIDGE, ID 83610-0176
PO BOX 177, CAMBRIDGE, ID 83610-0177
PO BOX 178, CAMBRIDGE, ID 83610-0178
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