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, DAVIS JUNCTION, IL 61020-0001
PO BOX 2, DAVIS JUNCTION, IL 61020-0002
PO BOX 3, DAVIS JUNCTION, IL 61020-0003
PO BOX 4, DAVIS JUNCTION, IL 61020-0004
PO BOX 5, DAVIS JUNCTION, IL 61020-0005
PO BOX 6, DAVIS JUNCTION, IL 61020-0006
PO BOX 7, DAVIS JUNCTION, IL 61020-0007
PO BOX 8, DAVIS JUNCTION, IL 61020-0008
PO BOX 9, DAVIS JUNCTION, IL 61020-0009
PO BOX 10, DAVIS JUNCTION, IL 61020-0010
PO BOX 11, DAVIS JUNCTION, IL 61020-0011
PO BOX 12, DAVIS JUNCTION, IL 61020-0012
PO BOX 13, DAVIS JUNCTION, IL 61020-0013
PO BOX 14, DAVIS JUNCTION, IL 61020-0014
PO BOX 15, DAVIS JUNCTION, IL 61020-0015
PO BOX 16, DAVIS JUNCTION, IL 61020-0016
PO BOX 17, DAVIS JUNCTION, IL 61020-0017
PO BOX 18, DAVIS JUNCTION, IL 61020-0018
PO BOX 19, DAVIS JUNCTION, IL 61020-0019
PO BOX 20, DAVIS JUNCTION, IL 61020-0020
PO BOX 21, DAVIS JUNCTION, IL 61020-0021
PO BOX 22, DAVIS JUNCTION, IL 61020-0022
PO BOX 23, DAVIS JUNCTION, IL 61020-0023
PO BOX 24, DAVIS JUNCTION, IL 61020-0024
PO BOX 25, DAVIS JUNCTION, IL 61020-0025
PO BOX 26, DAVIS JUNCTION, IL 61020-0026
PO BOX 27, DAVIS JUNCTION, IL 61020-0027
PO BOX 28, DAVIS JUNCTION, IL 61020-0028
PO BOX 29, DAVIS JUNCTION, IL 61020-0029
PO BOX 30, DAVIS JUNCTION, IL 61020-0030
PO BOX 31, DAVIS JUNCTION, IL 61020-0031
PO BOX 32, DAVIS JUNCTION, IL 61020-0032
PO BOX 33, DAVIS JUNCTION, IL 61020-0033
PO BOX 34, DAVIS JUNCTION, IL 61020-0034
PO BOX 35, DAVIS JUNCTION, IL 61020-0035
PO BOX 36, DAVIS JUNCTION, IL 61020-0036
PO BOX 37, DAVIS JUNCTION, IL 61020-0037
PO BOX 38, DAVIS JUNCTION, IL 61020-0038
PO BOX 39, DAVIS JUNCTION, IL 61020-0039
PO BOX 40, DAVIS JUNCTION, IL 61020-0040
PO BOX 41, DAVIS JUNCTION, IL 61020-0041
PO BOX 42, DAVIS JUNCTION, IL 61020-0042
PO BOX 43, DAVIS JUNCTION, IL 61020-0043
PO BOX 44, DAVIS JUNCTION, IL 61020-0044
PO BOX 45, DAVIS JUNCTION, IL 61020-0045
PO BOX 46, DAVIS JUNCTION, IL 61020-0046
PO BOX 47, DAVIS JUNCTION, IL 61020-0047
PO BOX 48, DAVIS JUNCTION, IL 61020-0048
PO BOX 49, DAVIS JUNCTION, IL 61020-0049
PO BOX 50, DAVIS JUNCTION, IL 61020-0050
PO BOX 51, DAVIS JUNCTION, IL 61020-0051
PO BOX 52, DAVIS JUNCTION, IL 61020-0052
PO BOX 53, DAVIS JUNCTION, IL 61020-0053
PO BOX 54, DAVIS JUNCTION, IL 61020-0054
PO BOX 55, DAVIS JUNCTION, IL 61020-0055
PO BOX 56, DAVIS JUNCTION, IL 61020-0056
PO BOX 57, DAVIS JUNCTION, IL 61020-0057
PO BOX 58, DAVIS JUNCTION, IL 61020-0058
PO BOX 59, DAVIS JUNCTION, IL 61020-0059
PO BOX 60, DAVIS JUNCTION, IL 61020-0060
PO BOX 61, DAVIS JUNCTION, IL 61020-0061
PO BOX 62, DAVIS JUNCTION, IL 61020-0062
PO BOX 63, DAVIS JUNCTION, IL 61020-0063
PO BOX 64, DAVIS JUNCTION, IL 61020-0064
PO BOX 65, DAVIS JUNCTION, IL 61020-0065
PO BOX 66, DAVIS JUNCTION, IL 61020-0066
PO BOX 67, DAVIS JUNCTION, IL 61020-0067
PO BOX 68, DAVIS JUNCTION, IL 61020-0068
PO BOX 69, DAVIS JUNCTION, IL 61020-0069
PO BOX 70, DAVIS JUNCTION, IL 61020-0070
PO BOX 71, DAVIS JUNCTION, IL 61020-0071
PO BOX 72, DAVIS JUNCTION, IL 61020-0072
PO BOX 73, DAVIS JUNCTION, IL 61020-0073
PO BOX 74, DAVIS JUNCTION, IL 61020-0074
PO BOX 75, DAVIS JUNCTION, IL 61020-0075
PO BOX 76, DAVIS JUNCTION, IL 61020-0076
PO BOX 77, DAVIS JUNCTION, IL 61020-0077
PO BOX 78, DAVIS JUNCTION, IL 61020-0078
PO BOX 79, DAVIS JUNCTION, IL 61020-0079
PO BOX 80, DAVIS JUNCTION, IL 61020-0080
PO BOX 81, DAVIS JUNCTION, IL 61020-0081
PO BOX 82, DAVIS JUNCTION, IL 61020-0082
PO BOX 83, DAVIS JUNCTION, IL 61020-0083
PO BOX 84, DAVIS JUNCTION, IL 61020-0084
PO BOX 85, DAVIS JUNCTION, IL 61020-0085
PO BOX 86, DAVIS JUNCTION, IL 61020-0086
PO BOX 87, DAVIS JUNCTION, IL 61020-0087
PO BOX 88, DAVIS JUNCTION, IL 61020-0088
PO BOX 89, DAVIS JUNCTION, IL 61020-0089
PO BOX 90, DAVIS JUNCTION, IL 61020-0090
PO BOX 91, DAVIS JUNCTION, IL 61020-0091
PO BOX 92, DAVIS JUNCTION, IL 61020-0092
PO BOX 93, DAVIS JUNCTION, IL 61020-0093
PO BOX 94, DAVIS JUNCTION, IL 61020-0094
PO BOX 95, DAVIS JUNCTION, IL 61020-0095
PO BOX 96, DAVIS JUNCTION, IL 61020-0096
PO BOX 97, DAVIS JUNCTION, IL 61020-0097
PO BOX 98, DAVIS JUNCTION, IL 61020-0098
PO BOX 99, DAVIS JUNCTION, IL 61020-0099
PO BOX 100, DAVIS JUNCTION, IL 61020-0100
PO BOX 101, DAVIS JUNCTION, IL 61020-0101
PO BOX 102, DAVIS JUNCTION, IL 61020-0102
PO BOX 103, DAVIS JUNCTION, IL 61020-0103
PO BOX 104, DAVIS JUNCTION, IL 61020-0104
PO BOX 105, DAVIS JUNCTION, IL 61020-0105
PO BOX 106, DAVIS JUNCTION, IL 61020-0106
PO BOX 107, DAVIS JUNCTION, IL 61020-0107
PO BOX 108, DAVIS JUNCTION, IL 61020-0108
PO BOX 109, DAVIS JUNCTION, IL 61020-0109
PO BOX 110, DAVIS JUNCTION, IL 61020-0110
PO BOX 111, DAVIS JUNCTION, IL 61020-0111
PO BOX 112, DAVIS JUNCTION, IL 61020-0112
PO BOX 113, DAVIS JUNCTION, IL 61020-0113
PO BOX 114, DAVIS JUNCTION, IL 61020-0114
PO BOX 115, DAVIS JUNCTION, IL 61020-0115
PO BOX 116, DAVIS JUNCTION, IL 61020-0116
PO BOX 117, DAVIS JUNCTION, IL 61020-0117
PO BOX 118, DAVIS JUNCTION, IL 61020-0118
PO BOX 119, DAVIS JUNCTION, IL 61020-0119
PO BOX 120, DAVIS JUNCTION, IL 61020-0120
PO BOX 121, DAVIS JUNCTION, IL 61020-0121
PO BOX 122, DAVIS JUNCTION, IL 61020-0122
PO BOX 123, DAVIS JUNCTION, IL 61020-0123
PO BOX 124, DAVIS JUNCTION, IL 61020-0124
PO BOX 125, DAVIS JUNCTION, IL 61020-0125
PO BOX 126, DAVIS JUNCTION, IL 61020-0126
PO BOX 127, DAVIS JUNCTION, IL 61020-0127
PO BOX 128, DAVIS JUNCTION, IL 61020-0128
PO BOX 129, DAVIS JUNCTION, IL 61020-0129
PO BOX 130, DAVIS JUNCTION, IL 61020-0130
PO BOX 131, DAVIS JUNCTION, IL 61020-0131
PO BOX 132, DAVIS JUNCTION, IL 61020-0132
PO BOX 133, DAVIS JUNCTION, IL 61020-0133
PO BOX 134, DAVIS JUNCTION, IL 61020-0134
PO BOX 135, DAVIS JUNCTION, IL 61020-0135
PO BOX 136, DAVIS JUNCTION, IL 61020-0136
PO BOX 137, DAVIS JUNCTION, IL 61020-0137
PO BOX 138, DAVIS JUNCTION, IL 61020-0138
PO BOX 139, DAVIS JUNCTION, IL 61020-0139
PO BOX 140, DAVIS JUNCTION, IL 61020-0140
PO BOX 141, DAVIS JUNCTION, IL 61020-0141
PO BOX 142, DAVIS JUNCTION, IL 61020-0142
PO BOX 143, DAVIS JUNCTION, IL 61020-0143
PO BOX 144, DAVIS JUNCTION, IL 61020-0144
PO BOX 145, DAVIS JUNCTION, IL 61020-0145
PO BOX 146, DAVIS JUNCTION, IL 61020-0146
PO BOX 147, DAVIS JUNCTION, IL 61020-0147
PO BOX 148, DAVIS JUNCTION, IL 61020-0148
PO BOX 149, DAVIS JUNCTION, IL 61020-0149
PO BOX 150, DAVIS JUNCTION, IL 61020-0150
PO BOX 151, DAVIS JUNCTION, IL 61020-0151
PO BOX 152, DAVIS JUNCTION, IL 61020-0152
PO BOX 153, DAVIS JUNCTION, IL 61020-0153
PO BOX 154, DAVIS JUNCTION, IL 61020-0154
PO BOX 155, DAVIS JUNCTION, IL 61020-0155
PO BOX 156, DAVIS JUNCTION, IL 61020-0156
PO BOX 157, DAVIS JUNCTION, IL 61020-0157
PO BOX 158, DAVIS JUNCTION, IL 61020-0158
PO BOX 159, DAVIS JUNCTION, IL 61020-0159
PO BOX 160, DAVIS JUNCTION, IL 61020-0160
PO BOX 161, DAVIS JUNCTION, IL 61020-0161
PO BOX 162, DAVIS JUNCTION, IL 61020-0162
PO BOX 163, DAVIS JUNCTION, IL 61020-0163
PO BOX 164, DAVIS JUNCTION, IL 61020-0164
PO BOX 165, DAVIS JUNCTION, IL 61020-0165
PO BOX 166, DAVIS JUNCTION, IL 61020-0166
PO BOX 167, DAVIS JUNCTION, IL 61020-0167
PO BOX 168, DAVIS JUNCTION, IL 61020-0168
PO BOX 169, DAVIS JUNCTION, IL 61020-0169
PO BOX 170, DAVIS JUNCTION, IL 61020-0170
PO BOX 171, DAVIS JUNCTION, IL 61020-0171
PO BOX 172, DAVIS JUNCTION, IL 61020-0172
PO BOX 173, DAVIS JUNCTION, IL 61020-0173
PO BOX 174, DAVIS JUNCTION, IL 61020-0174
PO BOX 175, DAVIS JUNCTION, IL 61020-0175
PO BOX 176, DAVIS JUNCTION, IL 61020-0176
PO BOX 177, DAVIS JUNCTION, IL 61020-0177
PO BOX 178, DAVIS JUNCTION, IL 61020-0178
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