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, NORTH LITTLE ROCK, AR 72115-0001
PO BOX 2, NORTH LITTLE ROCK, AR 72115-0002
PO BOX 3, NORTH LITTLE ROCK, AR 72115-0003
PO BOX 4, NORTH LITTLE ROCK, AR 72115-0004
PO BOX 5, NORTH LITTLE ROCK, AR 72115-0005
PO BOX 6, NORTH LITTLE ROCK, AR 72115-0006
PO BOX 7, NORTH LITTLE ROCK, AR 72115-0007
PO BOX 8, NORTH LITTLE ROCK, AR 72115-0008
PO BOX 9, NORTH LITTLE ROCK, AR 72115-0009
PO BOX 10, NORTH LITTLE ROCK, AR 72115-0010
PO BOX 11, NORTH LITTLE ROCK, AR 72115-0011
PO BOX 12, NORTH LITTLE ROCK, AR 72115-0012
PO BOX 13, NORTH LITTLE ROCK, AR 72115-0013
PO BOX 14, NORTH LITTLE ROCK, AR 72115-0014
PO BOX 15, NORTH LITTLE ROCK, AR 72115-0015
PO BOX 16, NORTH LITTLE ROCK, AR 72115-0016
PO BOX 17, NORTH LITTLE ROCK, AR 72115-0017
PO BOX 18, NORTH LITTLE ROCK, AR 72115-0018
PO BOX 19, NORTH LITTLE ROCK, AR 72115-0019
PO BOX 20, NORTH LITTLE ROCK, AR 72115-0020
PO BOX 21, NORTH LITTLE ROCK, AR 72115-0021
PO BOX 22, NORTH LITTLE ROCK, AR 72115-0022
PO BOX 23, NORTH LITTLE ROCK, AR 72115-0023
PO BOX 24, NORTH LITTLE ROCK, AR 72115-0024
PO BOX 25, NORTH LITTLE ROCK, AR 72115-0025
PO BOX 26, NORTH LITTLE ROCK, AR 72115-0026
PO BOX 27, NORTH LITTLE ROCK, AR 72115-0027
PO BOX 28, NORTH LITTLE ROCK, AR 72115-0028
PO BOX 29, NORTH LITTLE ROCK, AR 72115-0029
PO BOX 30, NORTH LITTLE ROCK, AR 72115-0030
PO BOX 31, NORTH LITTLE ROCK, AR 72115-0031
PO BOX 32, NORTH LITTLE ROCK, AR 72115-0032
PO BOX 33, NORTH LITTLE ROCK, AR 72115-0033
PO BOX 34, NORTH LITTLE ROCK, AR 72115-0034
PO BOX 35, NORTH LITTLE ROCK, AR 72115-0035
PO BOX 36, NORTH LITTLE ROCK, AR 72115-0036
PO BOX 37, NORTH LITTLE ROCK, AR 72115-0037
PO BOX 38, NORTH LITTLE ROCK, AR 72115-0038
PO BOX 39, NORTH LITTLE ROCK, AR 72115-0039
PO BOX 40, NORTH LITTLE ROCK, AR 72115-0040
PO BOX 41, NORTH LITTLE ROCK, AR 72115-0041
PO BOX 42, NORTH LITTLE ROCK, AR 72115-0042
PO BOX 43, NORTH LITTLE ROCK, AR 72115-0043
PO BOX 44, NORTH LITTLE ROCK, AR 72115-0044
PO BOX 45, NORTH LITTLE ROCK, AR 72115-0045
PO BOX 46, NORTH LITTLE ROCK, AR 72115-0046
PO BOX 47, NORTH LITTLE ROCK, AR 72115-0047
PO BOX 48, NORTH LITTLE ROCK, AR 72115-0048
PO BOX 49, NORTH LITTLE ROCK, AR 72115-0049
PO BOX 50, NORTH LITTLE ROCK, AR 72115-0050
PO BOX 51, NORTH LITTLE ROCK, AR 72115-0051
PO BOX 52, NORTH LITTLE ROCK, AR 72115-0052
PO BOX 53, NORTH LITTLE ROCK, AR 72115-0053
PO BOX 54, NORTH LITTLE ROCK, AR 72115-0054
PO BOX 55, NORTH LITTLE ROCK, AR 72115-0055
PO BOX 56, NORTH LITTLE ROCK, AR 72115-0056
PO BOX 57, NORTH LITTLE ROCK, AR 72115-0057
PO BOX 58, NORTH LITTLE ROCK, AR 72115-0058
PO BOX 59, NORTH LITTLE ROCK, AR 72115-0059
PO BOX 60, NORTH LITTLE ROCK, AR 72115-0060
PO BOX 61, NORTH LITTLE ROCK, AR 72115-0061
PO BOX 62, NORTH LITTLE ROCK, AR 72115-0062
PO BOX 63, NORTH LITTLE ROCK, AR 72115-0063
PO BOX 64, NORTH LITTLE ROCK, AR 72115-0064
PO BOX 65, NORTH LITTLE ROCK, AR 72115-0065
PO BOX 66, NORTH LITTLE ROCK, AR 72115-0066
PO BOX 67, NORTH LITTLE ROCK, AR 72115-0067
PO BOX 68, NORTH LITTLE ROCK, AR 72115-0068
PO BOX 69, NORTH LITTLE ROCK, AR 72115-0069
PO BOX 70, NORTH LITTLE ROCK, AR 72115-0070
PO BOX 71, NORTH LITTLE ROCK, AR 72115-0071
PO BOX 72, NORTH LITTLE ROCK, AR 72115-0072
PO BOX 73, NORTH LITTLE ROCK, AR 72115-0073
PO BOX 74, NORTH LITTLE ROCK, AR 72115-0074
PO BOX 75, NORTH LITTLE ROCK, AR 72115-0075
PO BOX 76, NORTH LITTLE ROCK, AR 72115-0076
PO BOX 77, NORTH LITTLE ROCK, AR 72115-0077
PO BOX 78, NORTH LITTLE ROCK, AR 72115-0078
PO BOX 79, NORTH LITTLE ROCK, AR 72115-0079
PO BOX 80, NORTH LITTLE ROCK, AR 72115-0080
PO BOX 81, NORTH LITTLE ROCK, AR 72115-0081
PO BOX 82, NORTH LITTLE ROCK, AR 72115-0082
PO BOX 83, NORTH LITTLE ROCK, AR 72115-0083
PO BOX 84, NORTH LITTLE ROCK, AR 72115-0084
PO BOX 85, NORTH LITTLE ROCK, AR 72115-0085
PO BOX 86, NORTH LITTLE ROCK, AR 72115-0086
PO BOX 87, NORTH LITTLE ROCK, AR 72115-0087
PO BOX 88, NORTH LITTLE ROCK, AR 72115-0088
PO BOX 89, NORTH LITTLE ROCK, AR 72115-0089
PO BOX 90, NORTH LITTLE ROCK, AR 72115-0090
PO BOX 91, NORTH LITTLE ROCK, AR 72115-0091
PO BOX 92, NORTH LITTLE ROCK, AR 72115-0092
PO BOX 93, NORTH LITTLE ROCK, AR 72115-0093
PO BOX 94, NORTH LITTLE ROCK, AR 72115-0094
PO BOX 95, NORTH LITTLE ROCK, AR 72115-0095
PO BOX 96, NORTH LITTLE ROCK, AR 72115-0096
PO BOX 97, NORTH LITTLE ROCK, AR 72115-0097
PO BOX 98, NORTH LITTLE ROCK, AR 72115-0098
PO BOX 99, NORTH LITTLE ROCK, AR 72115-0099
PO BOX 100, NORTH LITTLE ROCK, AR 72115-0100
PO BOX 101, NORTH LITTLE ROCK, AR 72115-0101
PO BOX 102, NORTH LITTLE ROCK, AR 72115-0102
PO BOX 103, NORTH LITTLE ROCK, AR 72115-0103
PO BOX 104, NORTH LITTLE ROCK, AR 72115-0104
PO BOX 105, NORTH LITTLE ROCK, AR 72115-0105
PO BOX 106, NORTH LITTLE ROCK, AR 72115-0106
PO BOX 107, NORTH LITTLE ROCK, AR 72115-0107
PO BOX 108, NORTH LITTLE ROCK, AR 72115-0108
PO BOX 109, NORTH LITTLE ROCK, AR 72115-0109
PO BOX 110, NORTH LITTLE ROCK, AR 72115-0110
PO BOX 111, NORTH LITTLE ROCK, AR 72115-0111
PO BOX 112, NORTH LITTLE ROCK, AR 72115-0112
PO BOX 113, NORTH LITTLE ROCK, AR 72115-0113
PO BOX 114, NORTH LITTLE ROCK, AR 72115-0114
PO BOX 115, NORTH LITTLE ROCK, AR 72115-0115
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