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, STOCKTON, MD 21864-0001
PO BOX 2, STOCKTON, MD 21864-0002
PO BOX 3, STOCKTON, MD 21864-0003
PO BOX 4, STOCKTON, MD 21864-0004
PO BOX 5, STOCKTON, MD 21864-0005
PO BOX 6, STOCKTON, MD 21864-0006
PO BOX 7, STOCKTON, MD 21864-0007
PO BOX 8, STOCKTON, MD 21864-0008
PO BOX 9, STOCKTON, MD 21864-0009
PO BOX 10, STOCKTON, MD 21864-0010
PO BOX 11, STOCKTON, MD 21864-0011
PO BOX 12, STOCKTON, MD 21864-0012
PO BOX 13, STOCKTON, MD 21864-0013
PO BOX 14, STOCKTON, MD 21864-0014
PO BOX 15, STOCKTON, MD 21864-0015
PO BOX 16, STOCKTON, MD 21864-0016
PO BOX 17, STOCKTON, MD 21864-0017
PO BOX 18, STOCKTON, MD 21864-0018
PO BOX 19, STOCKTON, MD 21864-0019
PO BOX 20, STOCKTON, MD 21864-0020
PO BOX 21, STOCKTON, MD 21864-0021
PO BOX 22, STOCKTON, MD 21864-0022
PO BOX 23, STOCKTON, MD 21864-0023
PO BOX 24, STOCKTON, MD 21864-0024
PO BOX 25, STOCKTON, MD 21864-0025
PO BOX 26, STOCKTON, MD 21864-0026
PO BOX 27, STOCKTON, MD 21864-0027
PO BOX 28, STOCKTON, MD 21864-0028
PO BOX 29, STOCKTON, MD 21864-0029
PO BOX 30, STOCKTON, MD 21864-0030
PO BOX 31, STOCKTON, MD 21864-0031
PO BOX 32, STOCKTON, MD 21864-0032
PO BOX 33, STOCKTON, MD 21864-0033
PO BOX 34, STOCKTON, MD 21864-0034
PO BOX 35, STOCKTON, MD 21864-0035
PO BOX 36, STOCKTON, MD 21864-0036
PO BOX 37, STOCKTON, MD 21864-0037
PO BOX 38, STOCKTON, MD 21864-0038
PO BOX 39, STOCKTON, MD 21864-0039
PO BOX 40, STOCKTON, MD 21864-0040
PO BOX 41, STOCKTON, MD 21864-0041
PO BOX 42, STOCKTON, MD 21864-0042
PO BOX 43, STOCKTON, MD 21864-0043
PO BOX 44, STOCKTON, MD 21864-0044
PO BOX 45, STOCKTON, MD 21864-0045
PO BOX 46, STOCKTON, MD 21864-0046
PO BOX 47, STOCKTON, MD 21864-0047
PO BOX 48, STOCKTON, MD 21864-0048
PO BOX 49, STOCKTON, MD 21864-0049
PO BOX 50, STOCKTON, MD 21864-0050
PO BOX 51, STOCKTON, MD 21864-0051
PO BOX 52, STOCKTON, MD 21864-0052
PO BOX 53, STOCKTON, MD 21864-0053
PO BOX 54, STOCKTON, MD 21864-0054
PO BOX 55, STOCKTON, MD 21864-0055
PO BOX 56, STOCKTON, MD 21864-0056
PO BOX 57, STOCKTON, MD 21864-0057
PO BOX 58, STOCKTON, MD 21864-0058
PO BOX 59, STOCKTON, MD 21864-0059
PO BOX 60, STOCKTON, MD 21864-0060
PO BOX 61, STOCKTON, MD 21864-0061
PO BOX 62, STOCKTON, MD 21864-0062
PO BOX 63, STOCKTON, MD 21864-0063
PO BOX 64, STOCKTON, MD 21864-0064
PO BOX 65, STOCKTON, MD 21864-0065
PO BOX 66, STOCKTON, MD 21864-0066
PO BOX 67, STOCKTON, MD 21864-0067
PO BOX 68, STOCKTON, MD 21864-0068
PO BOX 69, STOCKTON, MD 21864-0069
PO BOX 70, STOCKTON, MD 21864-0070
PO BOX 71, STOCKTON, MD 21864-0071
PO BOX 72, STOCKTON, MD 21864-0072
PO BOX 73, STOCKTON, MD 21864-0073
PO BOX 74, STOCKTON, MD 21864-0074
PO BOX 75, STOCKTON, MD 21864-0075
PO BOX 76, STOCKTON, MD 21864-0076
PO BOX 77, STOCKTON, MD 21864-0077
PO BOX 78, STOCKTON, MD 21864-0078
PO BOX 79, STOCKTON, MD 21864-0079
PO BOX 80, STOCKTON, MD 21864-0080
PO BOX 81, STOCKTON, MD 21864-0081
PO BOX 82, STOCKTON, MD 21864-0082
PO BOX 83, STOCKTON, MD 21864-0083
PO BOX 84, STOCKTON, MD 21864-0084
PO BOX 85, STOCKTON, MD 21864-0085
PO BOX 86, STOCKTON, MD 21864-0086
PO BOX 87, STOCKTON, MD 21864-0087
PO BOX 88, STOCKTON, MD 21864-0088
PO BOX 89, STOCKTON, MD 21864-0089
PO BOX 90, STOCKTON, MD 21864-0090
PO BOX 91, STOCKTON, MD 21864-0091
PO BOX 92, STOCKTON, MD 21864-0092
PO BOX 93, STOCKTON, MD 21864-0093
PO BOX 94, STOCKTON, MD 21864-0094
PO BOX 95, STOCKTON, MD 21864-0095
PO BOX 96, STOCKTON, MD 21864-0096
PO BOX 97, STOCKTON, MD 21864-0097
PO BOX 98, STOCKTON, MD 21864-0098
PO BOX 99, STOCKTON, MD 21864-0099
PO BOX 100, STOCKTON, MD 21864-0100
PO BOX 101, STOCKTON, MD 21864-0101
PO BOX 102, STOCKTON, MD 21864-0102
PO BOX 103, STOCKTON, MD 21864-0103
PO BOX 104, STOCKTON, MD 21864-0104
PO BOX 105, STOCKTON, MD 21864-0105
PO BOX 106, STOCKTON, MD 21864-0106
PO BOX 107, STOCKTON, MD 21864-0107
PO BOX 108, STOCKTON, MD 21864-0108
PO BOX 109, STOCKTON, MD 21864-0109
PO BOX 110, STOCKTON, MD 21864-0110
PO BOX 111, STOCKTON, MD 21864-0111
PO BOX 112, STOCKTON, MD 21864-0112
PO BOX 113, STOCKTON, MD 21864-0113
PO BOX 114, STOCKTON, MD 21864-0114
PO BOX 115, STOCKTON, MD 21864-0115
PO BOX 116, STOCKTON, MD 21864-0116
PO BOX 117, STOCKTON, MD 21864-0117
PO BOX 118, STOCKTON, MD 21864-0118
PO BOX 119, STOCKTON, MD 21864-0119
PO BOX 120, STOCKTON, MD 21864-0120
PO BOX 121, STOCKTON, MD 21864-0121
PO BOX 122, STOCKTON, MD 21864-0122
PO BOX 123, STOCKTON, MD 21864-0123
PO BOX 124, STOCKTON, MD 21864-0124
PO BOX 125, STOCKTON, MD 21864-0125
PO BOX 126, STOCKTON, MD 21864-0126
PO BOX 127, STOCKTON, MD 21864-0127
PO BOX 128, STOCKTON, MD 21864-0128
PO BOX 129, STOCKTON, MD 21864-0129
PO BOX 130, STOCKTON, MD 21864-0130
PO BOX 131, STOCKTON, MD 21864-0131
PO BOX 132, STOCKTON, MD 21864-0132
PO BOX 133, STOCKTON, MD 21864-0133
PO BOX 134, STOCKTON, MD 21864-0134
PO BOX 135, STOCKTON, MD 21864-0135
PO BOX 136, STOCKTON, MD 21864-0136
PO BOX 137, STOCKTON, MD 21864-0137
PO BOX 138, STOCKTON, MD 21864-0138
PO BOX 139, STOCKTON, MD 21864-0139
PO BOX 140, STOCKTON, MD 21864-0140
PO BOX 141, STOCKTON, MD 21864-0141
PO BOX 142, STOCKTON, MD 21864-0142
PO BOX 143, STOCKTON, MD 21864-0143
PO BOX 144, STOCKTON, MD 21864-0144
PO BOX 145, STOCKTON, MD 21864-0145
PO BOX 146, STOCKTON, MD 21864-0146
PO BOX 147, STOCKTON, MD 21864-0147
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