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, FEDERALSBURG, MD 21632-0001
PO BOX 2, FEDERALSBURG, MD 21632-0002
PO BOX 3, FEDERALSBURG, MD 21632-0003
PO BOX 4, FEDERALSBURG, MD 21632-0004
PO BOX 5, FEDERALSBURG, MD 21632-0005
PO BOX 6, FEDERALSBURG, MD 21632-0006
PO BOX 7, FEDERALSBURG, MD 21632-0007
PO BOX 8, FEDERALSBURG, MD 21632-0008
PO BOX 9, FEDERALSBURG, MD 21632-0009
PO BOX 10, FEDERALSBURG, MD 21632-0010
PO BOX 11, FEDERALSBURG, MD 21632-0011
PO BOX 12, FEDERALSBURG, MD 21632-0012
PO BOX 13, FEDERALSBURG, MD 21632-0013
PO BOX 14, FEDERALSBURG, MD 21632-0014
PO BOX 15, FEDERALSBURG, MD 21632-0015
PO BOX 16, FEDERALSBURG, MD 21632-0016
PO BOX 17, FEDERALSBURG, MD 21632-0017
PO BOX 18, FEDERALSBURG, MD 21632-0018
PO BOX 19, FEDERALSBURG, MD 21632-0019
PO BOX 20, FEDERALSBURG, MD 21632-0020
PO BOX 21, FEDERALSBURG, MD 21632-0021
PO BOX 22, FEDERALSBURG, MD 21632-0022
PO BOX 23, FEDERALSBURG, MD 21632-0023
PO BOX 24, FEDERALSBURG, MD 21632-0024
PO BOX 25, FEDERALSBURG, MD 21632-0025
PO BOX 26, FEDERALSBURG, MD 21632-0026
PO BOX 27, FEDERALSBURG, MD 21632-0027
PO BOX 28, FEDERALSBURG, MD 21632-0028
PO BOX 29, FEDERALSBURG, MD 21632-0029
PO BOX 30, FEDERALSBURG, MD 21632-0030
PO BOX 31, FEDERALSBURG, MD 21632-0031
PO BOX 32, FEDERALSBURG, MD 21632-0032
PO BOX 33, FEDERALSBURG, MD 21632-0033
PO BOX 34, FEDERALSBURG, MD 21632-0034
PO BOX 35, FEDERALSBURG, MD 21632-0035
PO BOX 36, FEDERALSBURG, MD 21632-0036
PO BOX 37, FEDERALSBURG, MD 21632-0037
PO BOX 38, FEDERALSBURG, MD 21632-0038
PO BOX 39, FEDERALSBURG, MD 21632-0039
PO BOX 40, FEDERALSBURG, MD 21632-0040
PO BOX 41, FEDERALSBURG, MD 21632-0041
PO BOX 42, FEDERALSBURG, MD 21632-0042
PO BOX 43, FEDERALSBURG, MD 21632-0043
PO BOX 44, FEDERALSBURG, MD 21632-0044
PO BOX 45, FEDERALSBURG, MD 21632-0045
PO BOX 46, FEDERALSBURG, MD 21632-0046
PO BOX 47, FEDERALSBURG, MD 21632-0047
PO BOX 48, FEDERALSBURG, MD 21632-0048
PO BOX 49, FEDERALSBURG, MD 21632-0049
PO BOX 50, FEDERALSBURG, MD 21632-0050
PO BOX 51, FEDERALSBURG, MD 21632-0051
PO BOX 52, FEDERALSBURG, MD 21632-0052
PO BOX 53, FEDERALSBURG, MD 21632-0053
PO BOX 54, FEDERALSBURG, MD 21632-0054
PO BOX 55, FEDERALSBURG, MD 21632-0055
PO BOX 56, FEDERALSBURG, MD 21632-0056
PO BOX 57, FEDERALSBURG, MD 21632-0057
PO BOX 58, FEDERALSBURG, MD 21632-0058
PO BOX 59, FEDERALSBURG, MD 21632-0059
PO BOX 60, FEDERALSBURG, MD 21632-0060
PO BOX 61, FEDERALSBURG, MD 21632-0061
PO BOX 62, FEDERALSBURG, MD 21632-0062
PO BOX 63, FEDERALSBURG, MD 21632-0063
PO BOX 64, FEDERALSBURG, MD 21632-0064
PO BOX 65, FEDERALSBURG, MD 21632-0065
PO BOX 66, FEDERALSBURG, MD 21632-0066
PO BOX 67, FEDERALSBURG, MD 21632-0067
PO BOX 68, FEDERALSBURG, MD 21632-0068
PO BOX 69, FEDERALSBURG, MD 21632-0069
PO BOX 70, FEDERALSBURG, MD 21632-0070
PO BOX 71, FEDERALSBURG, MD 21632-0071
PO BOX 72, FEDERALSBURG, MD 21632-0072
PO BOX 73, FEDERALSBURG, MD 21632-0073
PO BOX 74, FEDERALSBURG, MD 21632-0074
PO BOX 75, FEDERALSBURG, MD 21632-0075
PO BOX 76, FEDERALSBURG, MD 21632-0076
PO BOX 77, FEDERALSBURG, MD 21632-0077
PO BOX 78, FEDERALSBURG, MD 21632-0078
PO BOX 79, FEDERALSBURG, MD 21632-0079
PO BOX 80, FEDERALSBURG, MD 21632-0080
PO BOX 81, FEDERALSBURG, MD 21632-0081
PO BOX 82, FEDERALSBURG, MD 21632-0082
PO BOX 83, FEDERALSBURG, MD 21632-0083
PO BOX 84, FEDERALSBURG, MD 21632-0084
PO BOX 85, FEDERALSBURG, MD 21632-0085
PO BOX 86, FEDERALSBURG, MD 21632-0086
PO BOX 87, FEDERALSBURG, MD 21632-0087
PO BOX 88, FEDERALSBURG, MD 21632-0088
PO BOX 89, FEDERALSBURG, MD 21632-0089
PO BOX 90, FEDERALSBURG, MD 21632-0090
PO BOX 91, FEDERALSBURG, MD 21632-0091
PO BOX 92, FEDERALSBURG, MD 21632-0092
PO BOX 93, FEDERALSBURG, MD 21632-0093
PO BOX 94, FEDERALSBURG, MD 21632-0094
PO BOX 95, FEDERALSBURG, MD 21632-0095
PO BOX 96, FEDERALSBURG, MD 21632-0096
PO BOX 97, FEDERALSBURG, MD 21632-0097
PO BOX 98, FEDERALSBURG, MD 21632-0098
PO BOX 99, FEDERALSBURG, MD 21632-0099
PO BOX 100, FEDERALSBURG, MD 21632-0100
PO BOX 101, FEDERALSBURG, MD 21632-0101
PO BOX 102, FEDERALSBURG, MD 21632-0102
PO BOX 103, FEDERALSBURG, MD 21632-0103
PO BOX 104, FEDERALSBURG, MD 21632-0104
PO BOX 105, FEDERALSBURG, MD 21632-0105
PO BOX 106, FEDERALSBURG, MD 21632-0106
PO BOX 107, FEDERALSBURG, MD 21632-0107
PO BOX 108, FEDERALSBURG, MD 21632-0108
PO BOX 109, FEDERALSBURG, MD 21632-0109
PO BOX 110, FEDERALSBURG, MD 21632-0110
PO BOX 111, FEDERALSBURG, MD 21632-0111
PO BOX 112, FEDERALSBURG, MD 21632-0112
PO BOX 113, FEDERALSBURG, MD 21632-0113
PO BOX 114, FEDERALSBURG, MD 21632-0114
PO BOX 115, FEDERALSBURG, MD 21632-0115
PO BOX 116, FEDERALSBURG, MD 21632-0116
PO BOX 117, FEDERALSBURG, MD 21632-0117
PO BOX 118, FEDERALSBURG, MD 21632-0118
PO BOX 119, FEDERALSBURG, MD 21632-0119
PO BOX 120, FEDERALSBURG, MD 21632-0120
PO BOX 121, FEDERALSBURG, MD 21632-0121
PO BOX 122, FEDERALSBURG, MD 21632-0122
PO BOX 123, FEDERALSBURG, MD 21632-0123
PO BOX 124, FEDERALSBURG, MD 21632-0124
PO BOX 125, FEDERALSBURG, MD 21632-0125
PO BOX 126, FEDERALSBURG, MD 21632-0126
PO BOX 127, FEDERALSBURG, MD 21632-0127
PO BOX 128, FEDERALSBURG, MD 21632-0128
PO BOX 129, FEDERALSBURG, MD 21632-0129
PO BOX 130, FEDERALSBURG, MD 21632-0130
PO BOX 131, FEDERALSBURG, MD 21632-0131
PO BOX 132, FEDERALSBURG, MD 21632-0132
PO BOX 133, FEDERALSBURG, MD 21632-0133
PO BOX 134, FEDERALSBURG, MD 21632-0134
PO BOX 135, FEDERALSBURG, MD 21632-0135
PO BOX 136, FEDERALSBURG, MD 21632-0136
PO BOX 137, FEDERALSBURG, MD 21632-0137
PO BOX 138, FEDERALSBURG, MD 21632-0138
PO BOX 139, FEDERALSBURG, MD 21632-0139
PO BOX 140, FEDERALSBURG, MD 21632-0140
PO BOX 141, FEDERALSBURG, MD 21632-0141
PO BOX 142, FEDERALSBURG, MD 21632-0142
PO BOX 143, FEDERALSBURG, MD 21632-0143
PO BOX 144, FEDERALSBURG, MD 21632-0144
PO BOX 145, FEDERALSBURG, MD 21632-0145
PO BOX 146, FEDERALSBURG, MD 21632-0146
PO BOX 147, FEDERALSBURG, MD 21632-0147
PO BOX 148, FEDERALSBURG, MD 21632-0148
PO BOX 149, FEDERALSBURG, MD 21632-0149
PO BOX 150, FEDERALSBURG, MD 21632-0150
PO BOX 151, FEDERALSBURG, MD 21632-0151
PO BOX 152, FEDERALSBURG, MD 21632-0152
PO BOX 153, FEDERALSBURG, MD 21632-0153
PO BOX 154, FEDERALSBURG, MD 21632-0154
PO BOX 155, FEDERALSBURG, MD 21632-0155
PO BOX 156, FEDERALSBURG, MD 21632-0156
PO BOX 157, FEDERALSBURG, MD 21632-0157
PO BOX 158, FEDERALSBURG, MD 21632-0158
PO BOX 159, FEDERALSBURG, MD 21632-0159
PO BOX 160, FEDERALSBURG, MD 21632-0160
PO BOX 161, FEDERALSBURG, MD 21632-0161
PO BOX 162, FEDERALSBURG, MD 21632-0162
PO BOX 163, FEDERALSBURG, MD 21632-0163
PO BOX 164, FEDERALSBURG, MD 21632-0164
PO BOX 165, FEDERALSBURG, MD 21632-0165
PO BOX 166, FEDERALSBURG, MD 21632-0166
PO BOX 167, FEDERALSBURG, MD 21632-0167
PO BOX 168, FEDERALSBURG, MD 21632-0168
PO BOX 169, FEDERALSBURG, MD 21632-0169
PO BOX 170, FEDERALSBURG, MD 21632-0170
PO BOX 171, FEDERALSBURG, MD 21632-0171
PO BOX 172, FEDERALSBURG, MD 21632-0172
PO BOX 173, FEDERALSBURG, MD 21632-0173
PO BOX 174, FEDERALSBURG, MD 21632-0174
PO BOX 175, FEDERALSBURG, MD 21632-0175
PO BOX 176, FEDERALSBURG, MD 21632-0176
PO BOX 177, FEDERALSBURG, MD 21632-0177
PO BOX 178, FEDERALSBURG, MD 21632-0178
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