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, MILLINGTON, MD 21651-0001
PO BOX 2, MILLINGTON, MD 21651-0002
PO BOX 3, MILLINGTON, MD 21651-0003
PO BOX 4, MILLINGTON, MD 21651-0004
PO BOX 5, MILLINGTON, MD 21651-0005
PO BOX 6, MILLINGTON, MD 21651-0006
PO BOX 7, MILLINGTON, MD 21651-0007
PO BOX 8, MILLINGTON, MD 21651-0008
PO BOX 9, MILLINGTON, MD 21651-0009
PO BOX 10, MILLINGTON, MD 21651-0010
PO BOX 11, MILLINGTON, MD 21651-0011
PO BOX 12, MILLINGTON, MD 21651-0012
PO BOX 13, MILLINGTON, MD 21651-0013
PO BOX 14, MILLINGTON, MD 21651-0014
PO BOX 15, MILLINGTON, MD 21651-0015
PO BOX 16, MILLINGTON, MD 21651-0016
PO BOX 17, MILLINGTON, MD 21651-0017
PO BOX 18, MILLINGTON, MD 21651-0018
PO BOX 19, MILLINGTON, MD 21651-0019
PO BOX 20, MILLINGTON, MD 21651-0020
PO BOX 21, MILLINGTON, MD 21651-0021
PO BOX 22, MILLINGTON, MD 21651-0022
PO BOX 23, MILLINGTON, MD 21651-0023
PO BOX 24, MILLINGTON, MD 21651-0024
PO BOX 25, MILLINGTON, MD 21651-0025
PO BOX 26, MILLINGTON, MD 21651-0026
PO BOX 27, MILLINGTON, MD 21651-0027
PO BOX 28, MILLINGTON, MD 21651-0028
PO BOX 29, MILLINGTON, MD 21651-0029
PO BOX 30, MILLINGTON, MD 21651-0030
PO BOX 31, MILLINGTON, MD 21651-0031
PO BOX 32, MILLINGTON, MD 21651-0032
PO BOX 33, MILLINGTON, MD 21651-0033
PO BOX 34, MILLINGTON, MD 21651-0034
PO BOX 35, MILLINGTON, MD 21651-0035
PO BOX 36, MILLINGTON, MD 21651-0036
PO BOX 37, MILLINGTON, MD 21651-0037
PO BOX 38, MILLINGTON, MD 21651-0038
PO BOX 39, MILLINGTON, MD 21651-0039
PO BOX 40, MILLINGTON, MD 21651-0040
PO BOX 41, MILLINGTON, MD 21651-0041
PO BOX 42, MILLINGTON, MD 21651-0042
PO BOX 43, MILLINGTON, MD 21651-0043
PO BOX 44, MILLINGTON, MD 21651-0044
PO BOX 45, MILLINGTON, MD 21651-0045
PO BOX 46, MILLINGTON, MD 21651-0046
PO BOX 47, MILLINGTON, MD 21651-0047
PO BOX 48, MILLINGTON, MD 21651-0048
PO BOX 49, MILLINGTON, MD 21651-0049
PO BOX 50, MILLINGTON, MD 21651-0050
PO BOX 51, MILLINGTON, MD 21651-0051
PO BOX 52, MILLINGTON, MD 21651-0052
PO BOX 53, MILLINGTON, MD 21651-0053
PO BOX 54, MILLINGTON, MD 21651-0054
PO BOX 55, MILLINGTON, MD 21651-0055
PO BOX 56, MILLINGTON, MD 21651-0056
PO BOX 57, MILLINGTON, MD 21651-0057
PO BOX 58, MILLINGTON, MD 21651-0058
PO BOX 59, MILLINGTON, MD 21651-0059
PO BOX 60, MILLINGTON, MD 21651-0060
PO BOX 61, MILLINGTON, MD 21651-0061
PO BOX 62, MILLINGTON, MD 21651-0062
PO BOX 63, MILLINGTON, MD 21651-0063
PO BOX 64, MILLINGTON, MD 21651-0064
PO BOX 65, MILLINGTON, MD 21651-0065
PO BOX 66, MILLINGTON, MD 21651-0066
PO BOX 67, MILLINGTON, MD 21651-0067
PO BOX 68, MILLINGTON, MD 21651-0068
PO BOX 69, MILLINGTON, MD 21651-0069
PO BOX 70, MILLINGTON, MD 21651-0070
PO BOX 71, MILLINGTON, MD 21651-0071
PO BOX 72, MILLINGTON, MD 21651-0072
PO BOX 73, MILLINGTON, MD 21651-0073
PO BOX 74, MILLINGTON, MD 21651-0074
PO BOX 75, MILLINGTON, MD 21651-0075
PO BOX 76, MILLINGTON, MD 21651-0076
PO BOX 77, MILLINGTON, MD 21651-0077
PO BOX 78, MILLINGTON, MD 21651-0078
PO BOX 79, MILLINGTON, MD 21651-0079
PO BOX 80, MILLINGTON, MD 21651-0080
PO BOX 81, MILLINGTON, MD 21651-0081
PO BOX 82, MILLINGTON, MD 21651-0082
PO BOX 83, MILLINGTON, MD 21651-0083
PO BOX 84, MILLINGTON, MD 21651-0084
PO BOX 85, MILLINGTON, MD 21651-0085
PO BOX 86, MILLINGTON, MD 21651-0086
PO BOX 87, MILLINGTON, MD 21651-0087
PO BOX 88, MILLINGTON, MD 21651-0088
PO BOX 89, MILLINGTON, MD 21651-0089
PO BOX 90, MILLINGTON, MD 21651-0090
PO BOX 91, MILLINGTON, MD 21651-0091
PO BOX 92, MILLINGTON, MD 21651-0092
PO BOX 93, MILLINGTON, MD 21651-0093
PO BOX 94, MILLINGTON, MD 21651-0094
PO BOX 95, MILLINGTON, MD 21651-0095
PO BOX 96, MILLINGTON, MD 21651-0096
PO BOX 97, MILLINGTON, MD 21651-0097
PO BOX 98, MILLINGTON, MD 21651-0098
PO BOX 99, MILLINGTON, MD 21651-0099
PO BOX 100, MILLINGTON, MD 21651-0100
PO BOX 101, MILLINGTON, MD 21651-0101
PO BOX 102, MILLINGTON, MD 21651-0102
PO BOX 103, MILLINGTON, MD 21651-0103
PO BOX 104, MILLINGTON, MD 21651-0104
PO BOX 105, MILLINGTON, MD 21651-0105
PO BOX 106, MILLINGTON, MD 21651-0106
PO BOX 107, MILLINGTON, MD 21651-0107
PO BOX 108, MILLINGTON, MD 21651-0108
PO BOX 109, MILLINGTON, MD 21651-0109
PO BOX 110, MILLINGTON, MD 21651-0110
PO BOX 111, MILLINGTON, MD 21651-0111
PO BOX 112, MILLINGTON, MD 21651-0112
PO BOX 113, MILLINGTON, MD 21651-0113
PO BOX 114, MILLINGTON, MD 21651-0114
PO BOX 115, MILLINGTON, MD 21651-0115
PO BOX 116, MILLINGTON, MD 21651-0116
PO BOX 117, MILLINGTON, MD 21651-0117
PO BOX 118, MILLINGTON, MD 21651-0118
PO BOX 119, MILLINGTON, MD 21651-0119
PO BOX 120, MILLINGTON, MD 21651-0120
PO BOX 121, MILLINGTON, MD 21651-0121
PO BOX 122, MILLINGTON, MD 21651-0122
PO BOX 123, MILLINGTON, MD 21651-0123
PO BOX 124, MILLINGTON, MD 21651-0124
PO BOX 125, MILLINGTON, MD 21651-0125
PO BOX 126, MILLINGTON, MD 21651-0126
PO BOX 127, MILLINGTON, MD 21651-0127
PO BOX 128, MILLINGTON, MD 21651-0128
PO BOX 129, MILLINGTON, MD 21651-0129
PO BOX 130, MILLINGTON, MD 21651-0130
PO BOX 131, MILLINGTON, MD 21651-0131
PO BOX 132, MILLINGTON, MD 21651-0132
PO BOX 133, MILLINGTON, MD 21651-0133
PO BOX 134, MILLINGTON, MD 21651-0134
PO BOX 135, MILLINGTON, MD 21651-0135
PO BOX 136, MILLINGTON, MD 21651-0136
PO BOX 137, MILLINGTON, MD 21651-0137
PO BOX 138, MILLINGTON, MD 21651-0138
PO BOX 139, MILLINGTON, MD 21651-0139
PO BOX 140, MILLINGTON, MD 21651-0140
PO BOX 141, MILLINGTON, MD 21651-0141
PO BOX 142, MILLINGTON, MD 21651-0142
PO BOX 143, MILLINGTON, MD 21651-0143
PO BOX 144, MILLINGTON, MD 21651-0144
PO BOX 145, MILLINGTON, MD 21651-0145
PO BOX 146, MILLINGTON, MD 21651-0146
PO BOX 147, MILLINGTON, MD 21651-0147
PO BOX 148, MILLINGTON, MD 21651-0148
PO BOX 149, MILLINGTON, MD 21651-0149
PO BOX 150, MILLINGTON, MD 21651-0150
PO BOX 151, MILLINGTON, MD 21651-0151
PO BOX 152, MILLINGTON, MD 21651-0152
PO BOX 153, MILLINGTON, MD 21651-0153
PO BOX 154, MILLINGTON, MD 21651-0154
PO BOX 155, MILLINGTON, MD 21651-0155
PO BOX 156, MILLINGTON, MD 21651-0156
PO BOX 157, MILLINGTON, MD 21651-0157
PO BOX 158, MILLINGTON, MD 21651-0158
PO BOX 159, MILLINGTON, MD 21651-0159
PO BOX 160, MILLINGTON, MD 21651-0160
PO BOX 161, MILLINGTON, MD 21651-0161
PO BOX 162, MILLINGTON, MD 21651-0162
PO BOX 163, MILLINGTON, MD 21651-0163
PO BOX 164, MILLINGTON, MD 21651-0164
PO BOX 165, MILLINGTON, MD 21651-0165
PO BOX 166, MILLINGTON, MD 21651-0166
PO BOX 167, MILLINGTON, MD 21651-0167
PO BOX 168, MILLINGTON, MD 21651-0168
PO BOX 169, MILLINGTON, MD 21651-0169
PO BOX 170, MILLINGTON, MD 21651-0170
PO BOX 171, MILLINGTON, MD 21651-0171
PO BOX 172, MILLINGTON, MD 21651-0172
PO BOX 173, MILLINGTON, MD 21651-0173
PO BOX 174, MILLINGTON, MD 21651-0174
PO BOX 175, MILLINGTON, MD 21651-0175
PO BOX 176, MILLINGTON, MD 21651-0176
PO BOX 177, MILLINGTON, MD 21651-0177
PO BOX 178, MILLINGTON, MD 21651-0178
PO BOX 179, MILLINGTON, MD 21651-0179
PO BOX 180, MILLINGTON, MD 21651-0180
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