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, ELK GROVE VILLAGE, IL 60009-0001
PO BOX 2, ELK GROVE VILLAGE, IL 60009-0002
PO BOX 3, ELK GROVE VILLAGE, IL 60009-0003
PO BOX 4, ELK GROVE VILLAGE, IL 60009-0004
PO BOX 5, ELK GROVE VILLAGE, IL 60009-0005
PO BOX 6, ELK GROVE VILLAGE, IL 60009-0006
PO BOX 7, ELK GROVE VILLAGE, IL 60009-0007
PO BOX 8, ELK GROVE VILLAGE, IL 60009-0008
PO BOX 9, ELK GROVE VILLAGE, IL 60009-0009
PO BOX 10, ELK GROVE VILLAGE, IL 60009-0010
PO BOX 11, ELK GROVE VILLAGE, IL 60009-0011
PO BOX 12, ELK GROVE VILLAGE, IL 60009-0012
PO BOX 13, ELK GROVE VILLAGE, IL 60009-0013
PO BOX 14, ELK GROVE VILLAGE, IL 60009-0014
PO BOX 15, ELK GROVE VILLAGE, IL 60009-0015
PO BOX 16, ELK GROVE VILLAGE, IL 60009-0016
PO BOX 17, ELK GROVE VILLAGE, IL 60009-0017
PO BOX 18, ELK GROVE VILLAGE, IL 60009-0018
PO BOX 19, ELK GROVE VILLAGE, IL 60009-0019
PO BOX 20, ELK GROVE VILLAGE, IL 60009-0020
PO BOX 21, ELK GROVE VILLAGE, IL 60009-0021
PO BOX 22, ELK GROVE VILLAGE, IL 60009-0022
PO BOX 23, ELK GROVE VILLAGE, IL 60009-0023
PO BOX 24, ELK GROVE VILLAGE, IL 60009-0024
PO BOX 25, ELK GROVE VILLAGE, IL 60009-0025
PO BOX 26, ELK GROVE VILLAGE, IL 60009-0026
PO BOX 27, ELK GROVE VILLAGE, IL 60009-0027
PO BOX 28, ELK GROVE VILLAGE, IL 60009-0028
PO BOX 29, ELK GROVE VILLAGE, IL 60009-0029
PO BOX 30, ELK GROVE VILLAGE, IL 60009-0030
PO BOX 31, ELK GROVE VILLAGE, IL 60009-0031
PO BOX 32, ELK GROVE VILLAGE, IL 60009-0032
PO BOX 33, ELK GROVE VILLAGE, IL 60009-0033
PO BOX 34, ELK GROVE VILLAGE, IL 60009-0034
PO BOX 35, ELK GROVE VILLAGE, IL 60009-0035
PO BOX 36, ELK GROVE VILLAGE, IL 60009-0036
PO BOX 37, ELK GROVE VILLAGE, IL 60009-0037
PO BOX 38, ELK GROVE VILLAGE, IL 60009-0038
PO BOX 39, ELK GROVE VILLAGE, IL 60009-0039
PO BOX 40, ELK GROVE VILLAGE, IL 60009-0040
PO BOX 41, ELK GROVE VILLAGE, IL 60009-0041
PO BOX 42, ELK GROVE VILLAGE, IL 60009-0042
PO BOX 43, ELK GROVE VILLAGE, IL 60009-0043
PO BOX 44, ELK GROVE VILLAGE, IL 60009-0044
PO BOX 45, ELK GROVE VILLAGE, IL 60009-0045
PO BOX 46, ELK GROVE VILLAGE, IL 60009-0046
PO BOX 47, ELK GROVE VILLAGE, IL 60009-0047
PO BOX 48, ELK GROVE VILLAGE, IL 60009-0048
PO BOX 49, ELK GROVE VILLAGE, IL 60009-0049
PO BOX 50, ELK GROVE VILLAGE, IL 60009-0050
PO BOX 51, ELK GROVE VILLAGE, IL 60009-0051
PO BOX 52, ELK GROVE VILLAGE, IL 60009-0052
PO BOX 53, ELK GROVE VILLAGE, IL 60009-0053
PO BOX 54, ELK GROVE VILLAGE, IL 60009-0054
PO BOX 55, ELK GROVE VILLAGE, IL 60009-0055
PO BOX 56, ELK GROVE VILLAGE, IL 60009-0056
PO BOX 57, ELK GROVE VILLAGE, IL 60009-0057
PO BOX 58, ELK GROVE VILLAGE, IL 60009-0058
PO BOX 59, ELK GROVE VILLAGE, IL 60009-0059
PO BOX 60, ELK GROVE VILLAGE, IL 60009-0060
PO BOX 61, ELK GROVE VILLAGE, IL 60009-0061
PO BOX 62, ELK GROVE VILLAGE, IL 60009-0062
PO BOX 63, ELK GROVE VILLAGE, IL 60009-0063
PO BOX 64, ELK GROVE VILLAGE, IL 60009-0064
PO BOX 65, ELK GROVE VILLAGE, IL 60009-0065
PO BOX 66, ELK GROVE VILLAGE, IL 60009-0066
PO BOX 67, ELK GROVE VILLAGE, IL 60009-0067
PO BOX 68, ELK GROVE VILLAGE, IL 60009-0068
PO BOX 69, ELK GROVE VILLAGE, IL 60009-0069
PO BOX 70, ELK GROVE VILLAGE, IL 60009-0070
PO BOX 71, ELK GROVE VILLAGE, IL 60009-0071
PO BOX 72, ELK GROVE VILLAGE, IL 60009-0072
PO BOX 73, ELK GROVE VILLAGE, IL 60009-0073
PO BOX 74, ELK GROVE VILLAGE, IL 60009-0074
PO BOX 75, ELK GROVE VILLAGE, IL 60009-0075
PO BOX 76, ELK GROVE VILLAGE, IL 60009-0076
PO BOX 77, ELK GROVE VILLAGE, IL 60009-0077
PO BOX 78, ELK GROVE VILLAGE, IL 60009-0078
PO BOX 79, ELK GROVE VILLAGE, IL 60009-0079
PO BOX 80, ELK GROVE VILLAGE, IL 60009-0080
PO BOX 81, ELK GROVE VILLAGE, IL 60009-0081
PO BOX 82, ELK GROVE VILLAGE, IL 60009-0082
PO BOX 83, ELK GROVE VILLAGE, IL 60009-0083
PO BOX 84, ELK GROVE VILLAGE, IL 60009-0084
PO BOX 85, ELK GROVE VILLAGE, IL 60009-0085
PO BOX 86, ELK GROVE VILLAGE, IL 60009-0086
PO BOX 87, ELK GROVE VILLAGE, IL 60009-0087
PO BOX 88, ELK GROVE VILLAGE, IL 60009-0088
PO BOX 89, ELK GROVE VILLAGE, IL 60009-0089
PO BOX 90, ELK GROVE VILLAGE, IL 60009-0090
PO BOX 91, ELK GROVE VILLAGE, IL 60009-0091
PO BOX 92, ELK GROVE VILLAGE, IL 60009-0092
PO BOX 93, ELK GROVE VILLAGE, IL 60009-0093
PO BOX 94, ELK GROVE VILLAGE, IL 60009-0094
PO BOX 95, ELK GROVE VILLAGE, IL 60009-0095
PO BOX 96, ELK GROVE VILLAGE, IL 60009-0096
PO BOX 97, ELK GROVE VILLAGE, IL 60009-0097
PO BOX 98, ELK GROVE VILLAGE, IL 60009-0098
PO BOX 99, ELK GROVE VILLAGE, IL 60009-0099
PO BOX 100, ELK GROVE VILLAGE, IL 60009-0100
PO BOX 101, ELK GROVE VILLAGE, IL 60009-0101
PO BOX 102, ELK GROVE VILLAGE, IL 60009-0102
PO BOX 103, ELK GROVE VILLAGE, IL 60009-0103
PO BOX 104, ELK GROVE VILLAGE, IL 60009-0104
PO BOX 105, ELK GROVE VILLAGE, IL 60009-0105
PO BOX 106, ELK GROVE VILLAGE, IL 60009-0106
PO BOX 107, ELK GROVE VILLAGE, IL 60009-0107
PO BOX 108, ELK GROVE VILLAGE, IL 60009-0108
PO BOX 109, ELK GROVE VILLAGE, IL 60009-0109
PO BOX 110, ELK GROVE VILLAGE, IL 60009-0110
PO BOX 111, ELK GROVE VILLAGE, IL 60009-0111
PO BOX 112, ELK GROVE VILLAGE, IL 60009-0112
PO BOX 113, ELK GROVE VILLAGE, IL 60009-0113
PO BOX 114, ELK GROVE VILLAGE, IL 60009-0114
PO BOX 115, ELK GROVE VILLAGE, IL 60009-0115
PO BOX 116, ELK GROVE VILLAGE, IL 60009-0116
PO BOX 117, ELK GROVE VILLAGE, IL 60009-0117
PO BOX 118, ELK GROVE VILLAGE, IL 60009-0118
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