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, UPPER MARLBORO, MD 20773-0001
PO BOX 2, UPPER MARLBORO, MD 20773-0002
PO BOX 3, UPPER MARLBORO, MD 20773-0003
PO BOX 4, UPPER MARLBORO, MD 20773-0004
PO BOX 5, UPPER MARLBORO, MD 20773-0005
PO BOX 6, UPPER MARLBORO, MD 20773-0006
PO BOX 7, UPPER MARLBORO, MD 20773-0007
PO BOX 8, UPPER MARLBORO, MD 20773-0008
PO BOX 9, UPPER MARLBORO, MD 20773-0009
PO BOX 10, UPPER MARLBORO, MD 20773-0010
PO BOX 11, UPPER MARLBORO, MD 20773-0011
PO BOX 12, UPPER MARLBORO, MD 20773-0012
PO BOX 13, UPPER MARLBORO, MD 20773-0013
PO BOX 14, UPPER MARLBORO, MD 20773-0014
PO BOX 15, UPPER MARLBORO, MD 20773-0015
PO BOX 16, UPPER MARLBORO, MD 20773-0016
PO BOX 17, UPPER MARLBORO, MD 20773-0017
PO BOX 18, UPPER MARLBORO, MD 20773-0018
PO BOX 19, UPPER MARLBORO, MD 20773-0019
PO BOX 20, UPPER MARLBORO, MD 20773-0020
PO BOX 21, UPPER MARLBORO, MD 20773-0021
PO BOX 22, UPPER MARLBORO, MD 20773-0022
PO BOX 23, UPPER MARLBORO, MD 20773-0023
PO BOX 24, UPPER MARLBORO, MD 20773-0024
PO BOX 25, UPPER MARLBORO, MD 20773-0025
PO BOX 26, UPPER MARLBORO, MD 20773-0026
PO BOX 27, UPPER MARLBORO, MD 20773-0027
PO BOX 28, UPPER MARLBORO, MD 20773-0028
PO BOX 29, UPPER MARLBORO, MD 20773-0029
PO BOX 30, UPPER MARLBORO, MD 20773-0030
PO BOX 31, UPPER MARLBORO, MD 20773-0031
PO BOX 32, UPPER MARLBORO, MD 20773-0032
PO BOX 33, UPPER MARLBORO, MD 20773-0033
PO BOX 34, UPPER MARLBORO, MD 20773-0034
PO BOX 35, UPPER MARLBORO, MD 20773-0035
PO BOX 36, UPPER MARLBORO, MD 20773-0036
PO BOX 37, UPPER MARLBORO, MD 20773-0037
PO BOX 38, UPPER MARLBORO, MD 20773-0038
PO BOX 39, UPPER MARLBORO, MD 20773-0039
PO BOX 40, UPPER MARLBORO, MD 20773-0040
PO BOX 41, UPPER MARLBORO, MD 20773-0041
PO BOX 42, UPPER MARLBORO, MD 20773-0042
PO BOX 43, UPPER MARLBORO, MD 20773-0043
PO BOX 44, UPPER MARLBORO, MD 20773-0044
PO BOX 45, UPPER MARLBORO, MD 20773-0045
PO BOX 46, UPPER MARLBORO, MD 20773-0046
PO BOX 47, UPPER MARLBORO, MD 20773-0047
PO BOX 48, UPPER MARLBORO, MD 20773-0048
PO BOX 49, UPPER MARLBORO, MD 20773-0049
PO BOX 50, UPPER MARLBORO, MD 20773-0050
PO BOX 51, UPPER MARLBORO, MD 20773-0051
PO BOX 52, UPPER MARLBORO, MD 20773-0052
PO BOX 53, UPPER MARLBORO, MD 20773-0053
PO BOX 54, UPPER MARLBORO, MD 20773-0054
PO BOX 55, UPPER MARLBORO, MD 20773-0055
PO BOX 56, UPPER MARLBORO, MD 20773-0056
PO BOX 57, UPPER MARLBORO, MD 20773-0057
PO BOX 58, UPPER MARLBORO, MD 20773-0058
PO BOX 59, UPPER MARLBORO, MD 20773-0059
PO BOX 60, UPPER MARLBORO, MD 20773-0060
PO BOX 61, UPPER MARLBORO, MD 20773-0061
PO BOX 62, UPPER MARLBORO, MD 20773-0062
PO BOX 63, UPPER MARLBORO, MD 20773-0063
PO BOX 64, UPPER MARLBORO, MD 20773-0064
PO BOX 65, UPPER MARLBORO, MD 20773-0065
PO BOX 66, UPPER MARLBORO, MD 20773-0066
PO BOX 67, UPPER MARLBORO, MD 20773-0067
PO BOX 68, UPPER MARLBORO, MD 20773-0068
PO BOX 69, UPPER MARLBORO, MD 20773-0069
PO BOX 70, UPPER MARLBORO, MD 20773-0070
PO BOX 71, UPPER MARLBORO, MD 20773-0071
PO BOX 72, UPPER MARLBORO, MD 20773-0072
PO BOX 73, UPPER MARLBORO, MD 20773-0073
PO BOX 74, UPPER MARLBORO, MD 20773-0074
PO BOX 75, UPPER MARLBORO, MD 20773-0075
PO BOX 76, UPPER MARLBORO, MD 20773-0076
PO BOX 77, UPPER MARLBORO, MD 20773-0077
PO BOX 78, UPPER MARLBORO, MD 20773-0078
PO BOX 79, UPPER MARLBORO, MD 20773-0079
PO BOX 80, UPPER MARLBORO, MD 20773-0080
PO BOX 81, UPPER MARLBORO, MD 20773-0081
PO BOX 82, UPPER MARLBORO, MD 20773-0082
PO BOX 83, UPPER MARLBORO, MD 20773-0083
PO BOX 84, UPPER MARLBORO, MD 20773-0084
PO BOX 85, UPPER MARLBORO, MD 20773-0085
PO BOX 86, UPPER MARLBORO, MD 20773-0086
PO BOX 87, UPPER MARLBORO, MD 20773-0087
PO BOX 88, UPPER MARLBORO, MD 20773-0088
PO BOX 89, UPPER MARLBORO, MD 20773-0089
PO BOX 90, UPPER MARLBORO, MD 20773-0090
PO BOX 91, UPPER MARLBORO, MD 20773-0091
PO BOX 92, UPPER MARLBORO, MD 20773-0092
PO BOX 93, UPPER MARLBORO, MD 20773-0093
PO BOX 94, UPPER MARLBORO, MD 20773-0094
PO BOX 95, UPPER MARLBORO, MD 20773-0095
PO BOX 96, UPPER MARLBORO, MD 20773-0096
PO BOX 97, UPPER MARLBORO, MD 20773-0097
PO BOX 98, UPPER MARLBORO, MD 20773-0098
PO BOX 99, UPPER MARLBORO, MD 20773-0099
PO BOX 100, UPPER MARLBORO, MD 20773-0100
PO BOX 101, UPPER MARLBORO, MD 20773-0101
PO BOX 102, UPPER MARLBORO, MD 20773-0102
PO BOX 103, UPPER MARLBORO, MD 20773-0103
PO BOX 104, UPPER MARLBORO, MD 20773-0104
PO BOX 105, UPPER MARLBORO, MD 20773-0105
PO BOX 106, UPPER MARLBORO, MD 20773-0106
PO BOX 107, UPPER MARLBORO, MD 20773-0107
PO BOX 108, UPPER MARLBORO, MD 20773-0108
PO BOX 109, UPPER MARLBORO, MD 20773-0109
PO BOX 110, UPPER MARLBORO, MD 20773-0110
PO BOX 111, UPPER MARLBORO, MD 20773-0111
PO BOX 112, UPPER MARLBORO, MD 20773-0112
PO BOX 113, UPPER MARLBORO, MD 20773-0113
PO BOX 114, UPPER MARLBORO, MD 20773-0114
PO BOX 115, UPPER MARLBORO, MD 20773-0115
PO BOX 116, UPPER MARLBORO, MD 20773-0116
PO BOX 117, UPPER MARLBORO, MD 20773-0117
PO BOX 118, UPPER MARLBORO, MD 20773-0118
PO BOX 119, UPPER MARLBORO, MD 20773-0119
PO BOX 120, UPPER MARLBORO, MD 20773-0120
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