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 11, LINCOLNSHIRE, IL 60069-0011
PO BOX 12, LINCOLNSHIRE, IL 60069-0012
PO BOX 13, LINCOLNSHIRE, IL 60069-0013
PO BOX 14, LINCOLNSHIRE, IL 60069-0014
PO BOX 15, LINCOLNSHIRE, IL 60069-0015
PO BOX 16, LINCOLNSHIRE, IL 60069-0016
PO BOX 17, LINCOLNSHIRE, IL 60069-0017
PO BOX 18, LINCOLNSHIRE, IL 60069-0018
PO BOX 19, LINCOLNSHIRE, IL 60069-0019
PO BOX 20, LINCOLNSHIRE, IL 60069-0020
PO BOX 21, LINCOLNSHIRE, IL 60069-0021
PO BOX 22, LINCOLNSHIRE, IL 60069-0022
PO BOX 23, LINCOLNSHIRE, IL 60069-0023
PO BOX 24, LINCOLNSHIRE, IL 60069-0024
PO BOX 25, LINCOLNSHIRE, IL 60069-0025
PO BOX 26, LINCOLNSHIRE, IL 60069-0026
PO BOX 27, LINCOLNSHIRE, IL 60069-0027
PO BOX 28, LINCOLNSHIRE, IL 60069-0028
PO BOX 29, LINCOLNSHIRE, IL 60069-0029
PO BOX 30, LINCOLNSHIRE, IL 60069-0030
PO BOX 31, LINCOLNSHIRE, IL 60069-0031
PO BOX 32, LINCOLNSHIRE, IL 60069-0032
PO BOX 33, LINCOLNSHIRE, IL 60069-0033
PO BOX 34, LINCOLNSHIRE, IL 60069-0034
PO BOX 35, LINCOLNSHIRE, IL 60069-0035
PO BOX 36, LINCOLNSHIRE, IL 60069-0036
PO BOX 37, LINCOLNSHIRE, IL 60069-0037
PO BOX 38, LINCOLNSHIRE, IL 60069-0038
PO BOX 39, LINCOLNSHIRE, IL 60069-0039
PO BOX 40, LINCOLNSHIRE, IL 60069-0040
PO BOX 41, LINCOLNSHIRE, IL 60069-0041
PO BOX 42, LINCOLNSHIRE, IL 60069-0042
PO BOX 43, LINCOLNSHIRE, IL 60069-0043
PO BOX 44, LINCOLNSHIRE, IL 60069-0044
PO BOX 45, LINCOLNSHIRE, IL 60069-0045
PO BOX 46, LINCOLNSHIRE, IL 60069-0046
PO BOX 47, LINCOLNSHIRE, IL 60069-0047
PO BOX 48, LINCOLNSHIRE, IL 60069-0048
PO BOX 49, LINCOLNSHIRE, IL 60069-0049
PO BOX 50, LINCOLNSHIRE, IL 60069-0050
PO BOX 51, LINCOLNSHIRE, IL 60069-0051
PO BOX 52, LINCOLNSHIRE, IL 60069-0052
PO BOX 53, LINCOLNSHIRE, IL 60069-0053
PO BOX 54, LINCOLNSHIRE, IL 60069-0054
PO BOX 55, LINCOLNSHIRE, IL 60069-0055
PO BOX 56, LINCOLNSHIRE, IL 60069-0056
PO BOX 57, LINCOLNSHIRE, IL 60069-0057
PO BOX 58, LINCOLNSHIRE, IL 60069-0058
PO BOX 59, LINCOLNSHIRE, IL 60069-0059
PO BOX 60, LINCOLNSHIRE, IL 60069-0060
PO BOX 61, LINCOLNSHIRE, IL 60069-0061
PO BOX 62, LINCOLNSHIRE, IL 60069-0062
PO BOX 63, LINCOLNSHIRE, IL 60069-0063
PO BOX 64, LINCOLNSHIRE, IL 60069-0064
PO BOX 65, LINCOLNSHIRE, IL 60069-0065
PO BOX 66, LINCOLNSHIRE, IL 60069-0066
PO BOX 67, LINCOLNSHIRE, IL 60069-0067
PO BOX 68, LINCOLNSHIRE, IL 60069-0068
PO BOX 69, LINCOLNSHIRE, IL 60069-0069
PO BOX 70, LINCOLNSHIRE, IL 60069-0070
PO BOX 71, LINCOLNSHIRE, IL 60069-0071
PO BOX 72, LINCOLNSHIRE, IL 60069-0072
PO BOX 73, LINCOLNSHIRE, IL 60069-0073
PO BOX 74, LINCOLNSHIRE, IL 60069-0074
PO BOX 75, LINCOLNSHIRE, IL 60069-0075
PO BOX 76, LINCOLNSHIRE, IL 60069-0076
PO BOX 77, LINCOLNSHIRE, IL 60069-0077
PO BOX 78, LINCOLNSHIRE, IL 60069-0078
PO BOX 79, LINCOLNSHIRE, IL 60069-0079
PO BOX 80, LINCOLNSHIRE, IL 60069-0080
PO BOX 81, LINCOLNSHIRE, IL 60069-0081
PO BOX 82, LINCOLNSHIRE, IL 60069-0082
PO BOX 83, LINCOLNSHIRE, IL 60069-0083
PO BOX 84, LINCOLNSHIRE, IL 60069-0084
PO BOX 85, LINCOLNSHIRE, IL 60069-0085
PO BOX 86, LINCOLNSHIRE, IL 60069-0086
PO BOX 87, LINCOLNSHIRE, IL 60069-0087
PO BOX 88, LINCOLNSHIRE, IL 60069-0088
PO BOX 89, LINCOLNSHIRE, IL 60069-0089
PO BOX 90, LINCOLNSHIRE, IL 60069-0090
PO BOX 91, LINCOLNSHIRE, IL 60069-0091
PO BOX 92, LINCOLNSHIRE, IL 60069-0092
PO BOX 93, LINCOLNSHIRE, IL 60069-0093
PO BOX 94, LINCOLNSHIRE, IL 60069-0094
PO BOX 95, LINCOLNSHIRE, IL 60069-0095
PO BOX 96, LINCOLNSHIRE, IL 60069-0096
PO BOX 97, LINCOLNSHIRE, IL 60069-0097
PO BOX 98, LINCOLNSHIRE, IL 60069-0098
PO BOX 99, LINCOLNSHIRE, IL 60069-0099
PO BOX 100, LINCOLNSHIRE, IL 60069-0100
PO BOX 101, LINCOLNSHIRE, IL 60069-0101
PO BOX 102, LINCOLNSHIRE, IL 60069-0102
PO BOX 103, LINCOLNSHIRE, IL 60069-0103
PO BOX 104, LINCOLNSHIRE, IL 60069-0104
PO BOX 105, LINCOLNSHIRE, IL 60069-0105
PO BOX 106, LINCOLNSHIRE, IL 60069-0106
PO BOX 107, LINCOLNSHIRE, IL 60069-0107
PO BOX 108, LINCOLNSHIRE, IL 60069-0108
PO BOX 109, LINCOLNSHIRE, IL 60069-0109
PO BOX 110, LINCOLNSHIRE, IL 60069-0110
PO BOX 111, LINCOLNSHIRE, IL 60069-0111
PO BOX 112, LINCOLNSHIRE, IL 60069-0112
PO BOX 113, LINCOLNSHIRE, IL 60069-0113
PO BOX 114, LINCOLNSHIRE, IL 60069-0114
PO BOX 115, LINCOLNSHIRE, IL 60069-0115
PO BOX 116, LINCOLNSHIRE, IL 60069-0116
PO BOX 117, LINCOLNSHIRE, IL 60069-0117
PO BOX 118, LINCOLNSHIRE, IL 60069-0118
PO BOX 119, LINCOLNSHIRE, IL 60069-0119
PO BOX 120, LINCOLNSHIRE, IL 60069-0120
PO BOX 121, LINCOLNSHIRE, IL 60069-0121
PO BOX 122, LINCOLNSHIRE, IL 60069-0122
PO BOX 123, LINCOLNSHIRE, IL 60069-0123
PO BOX 124, LINCOLNSHIRE, IL 60069-0124
PO BOX 125, LINCOLNSHIRE, IL 60069-0125
PO BOX 126, LINCOLNSHIRE, IL 60069-0126
PO BOX 127, LINCOLNSHIRE, IL 60069-0127
PO BOX 128, LINCOLNSHIRE, IL 60069-0128
PO BOX 129, LINCOLNSHIRE, IL 60069-0129
PO BOX 130, LINCOLNSHIRE, IL 60069-0130
PO BOX 131, LINCOLNSHIRE, IL 60069-0131
PO BOX 132, LINCOLNSHIRE, IL 60069-0132
PO BOX 133, LINCOLNSHIRE, IL 60069-0133
PO BOX 134, LINCOLNSHIRE, IL 60069-0134
PO BOX 135, LINCOLNSHIRE, IL 60069-0135
PO BOX 136, LINCOLNSHIRE, IL 60069-0136
PO BOX 137, LINCOLNSHIRE, IL 60069-0137
PO BOX 138, LINCOLNSHIRE, IL 60069-0138
PO BOX 139, LINCOLNSHIRE, IL 60069-0139
PO BOX 140, LINCOLNSHIRE, IL 60069-0140
PO BOX 141, LINCOLNSHIRE, IL 60069-0141
PO BOX 142, LINCOLNSHIRE, IL 60069-0142
PO BOX 143, LINCOLNSHIRE, IL 60069-0143
PO BOX 144, LINCOLNSHIRE, IL 60069-0144
PO BOX 145, LINCOLNSHIRE, IL 60069-0145
PO BOX 146, LINCOLNSHIRE, IL 60069-0146
PO BOX 147, LINCOLNSHIRE, IL 60069-0147
PO BOX 148, LINCOLNSHIRE, IL 60069-0148
PO BOX 149, LINCOLNSHIRE, IL 60069-0149
PO BOX 150, LINCOLNSHIRE, IL 60069-0150
PO BOX 151, LINCOLNSHIRE, IL 60069-0151
PO BOX 152, LINCOLNSHIRE, IL 60069-0152
PO BOX 153, LINCOLNSHIRE, IL 60069-0153
PO BOX 154, LINCOLNSHIRE, IL 60069-0154
PO BOX 155, LINCOLNSHIRE, IL 60069-0155
PO BOX 156, LINCOLNSHIRE, IL 60069-0156
PO BOX 157, LINCOLNSHIRE, IL 60069-0157
PO BOX 158, LINCOLNSHIRE, IL 60069-0158
PO BOX 159, LINCOLNSHIRE, IL 60069-0159
PO BOX 160, LINCOLNSHIRE, IL 60069-0160
PO BOX 161, LINCOLNSHIRE, IL 60069-0161
PO BOX 162, LINCOLNSHIRE, IL 60069-0162
PO BOX 163, LINCOLNSHIRE, IL 60069-0163
PO BOX 164, LINCOLNSHIRE, IL 60069-0164
PO BOX 165, LINCOLNSHIRE, IL 60069-0165
PO BOX 166, LINCOLNSHIRE, IL 60069-0166
PO BOX 167, LINCOLNSHIRE, IL 60069-0167
PO BOX 168, LINCOLNSHIRE, IL 60069-0168
PO BOX 169, LINCOLNSHIRE, IL 60069-0169
PO BOX 170, LINCOLNSHIRE, IL 60069-0170
PO BOX 171, LINCOLNSHIRE, IL 60069-0171
PO BOX 172, LINCOLNSHIRE, IL 60069-0172
PO BOX 173, LINCOLNSHIRE, IL 60069-0173
PO BOX 174, LINCOLNSHIRE, IL 60069-0174
PO BOX 175, LINCOLNSHIRE, IL 60069-0175
PO BOX 176, LINCOLNSHIRE, IL 60069-0176
PO BOX 177, LINCOLNSHIRE, IL 60069-0177
PO BOX 178, LINCOLNSHIRE, IL 60069-0178
PO BOX 179, LINCOLNSHIRE, IL 60069-0179
PO BOX 180, LINCOLNSHIRE, IL 60069-0180