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, GREENSBORO, MD 21639-0001
PO BOX 2, GREENSBORO, MD 21639-0002
PO BOX 3, GREENSBORO, MD 21639-0003
PO BOX 4, GREENSBORO, MD 21639-0004
PO BOX 5, GREENSBORO, MD 21639-0005
PO BOX 6, GREENSBORO, MD 21639-0006
PO BOX 7, GREENSBORO, MD 21639-0007
PO BOX 8, GREENSBORO, MD 21639-0008
PO BOX 9, GREENSBORO, MD 21639-0009
PO BOX 10, GREENSBORO, MD 21639-0010
PO BOX 11, GREENSBORO, MD 21639-0011
PO BOX 12, GREENSBORO, MD 21639-0012
PO BOX 13, GREENSBORO, MD 21639-0013
PO BOX 14, GREENSBORO, MD 21639-0014
PO BOX 15, GREENSBORO, MD 21639-0015
PO BOX 16, GREENSBORO, MD 21639-0016
PO BOX 17, GREENSBORO, MD 21639-0017
PO BOX 18, GREENSBORO, MD 21639-0018
PO BOX 19, GREENSBORO, MD 21639-0019
PO BOX 20, GREENSBORO, MD 21639-0020
PO BOX 21, GREENSBORO, MD 21639-0021
PO BOX 22, GREENSBORO, MD 21639-0022
PO BOX 23, GREENSBORO, MD 21639-0023
PO BOX 24, GREENSBORO, MD 21639-0024
PO BOX 25, GREENSBORO, MD 21639-0025
PO BOX 26, GREENSBORO, MD 21639-0026
PO BOX 27, GREENSBORO, MD 21639-0027
PO BOX 28, GREENSBORO, MD 21639-0028
PO BOX 29, GREENSBORO, MD 21639-0029
PO BOX 30, GREENSBORO, MD 21639-0030
PO BOX 31, GREENSBORO, MD 21639-0031
PO BOX 32, GREENSBORO, MD 21639-0032
PO BOX 33, GREENSBORO, MD 21639-0033
PO BOX 34, GREENSBORO, MD 21639-0034
PO BOX 35, GREENSBORO, MD 21639-0035
PO BOX 36, GREENSBORO, MD 21639-0036
PO BOX 37, GREENSBORO, MD 21639-0037
PO BOX 38, GREENSBORO, MD 21639-0038
PO BOX 39, GREENSBORO, MD 21639-0039
PO BOX 40, GREENSBORO, MD 21639-0040
PO BOX 41, GREENSBORO, MD 21639-0041
PO BOX 42, GREENSBORO, MD 21639-0042
PO BOX 43, GREENSBORO, MD 21639-0043
PO BOX 44, GREENSBORO, MD 21639-0044
PO BOX 45, GREENSBORO, MD 21639-0045
PO BOX 46, GREENSBORO, MD 21639-0046
PO BOX 47, GREENSBORO, MD 21639-0047
PO BOX 48, GREENSBORO, MD 21639-0048
PO BOX 49, GREENSBORO, MD 21639-0049
PO BOX 50, GREENSBORO, MD 21639-0050
PO BOX 51, GREENSBORO, MD 21639-0051
PO BOX 52, GREENSBORO, MD 21639-0052
PO BOX 53, GREENSBORO, MD 21639-0053
PO BOX 54, GREENSBORO, MD 21639-0054
PO BOX 55, GREENSBORO, MD 21639-0055
PO BOX 56, GREENSBORO, MD 21639-0056
PO BOX 57, GREENSBORO, MD 21639-0057
PO BOX 58, GREENSBORO, MD 21639-0058
PO BOX 59, GREENSBORO, MD 21639-0059
PO BOX 60, GREENSBORO, MD 21639-0060
PO BOX 61, GREENSBORO, MD 21639-0061
PO BOX 62, GREENSBORO, MD 21639-0062
PO BOX 63, GREENSBORO, MD 21639-0063
PO BOX 64, GREENSBORO, MD 21639-0064
PO BOX 65, GREENSBORO, MD 21639-0065
PO BOX 66, GREENSBORO, MD 21639-0066
PO BOX 67, GREENSBORO, MD 21639-0067
PO BOX 68, GREENSBORO, MD 21639-0068
PO BOX 69, GREENSBORO, MD 21639-0069
PO BOX 70, GREENSBORO, MD 21639-0070
PO BOX 71, GREENSBORO, MD 21639-0071
PO BOX 72, GREENSBORO, MD 21639-0072
PO BOX 73, GREENSBORO, MD 21639-0073
PO BOX 74, GREENSBORO, MD 21639-0074
PO BOX 75, GREENSBORO, MD 21639-0075
PO BOX 76, GREENSBORO, MD 21639-0076
PO BOX 77, GREENSBORO, MD 21639-0077
PO BOX 78, GREENSBORO, MD 21639-0078
PO BOX 79, GREENSBORO, MD 21639-0079
PO BOX 80, GREENSBORO, MD 21639-0080
PO BOX 81, GREENSBORO, MD 21639-0081
PO BOX 82, GREENSBORO, MD 21639-0082
PO BOX 83, GREENSBORO, MD 21639-0083
PO BOX 84, GREENSBORO, MD 21639-0084
PO BOX 85, GREENSBORO, MD 21639-0085
PO BOX 86, GREENSBORO, MD 21639-0086
PO BOX 87, GREENSBORO, MD 21639-0087
PO BOX 88, GREENSBORO, MD 21639-0088
PO BOX 89, GREENSBORO, MD 21639-0089
PO BOX 90, GREENSBORO, MD 21639-0090
PO BOX 91, GREENSBORO, MD 21639-0091
PO BOX 92, GREENSBORO, MD 21639-0092
PO BOX 93, GREENSBORO, MD 21639-0093
PO BOX 94, GREENSBORO, MD 21639-0094
PO BOX 95, GREENSBORO, MD 21639-0095
PO BOX 96, GREENSBORO, MD 21639-0096
PO BOX 97, GREENSBORO, MD 21639-0097
PO BOX 98, GREENSBORO, MD 21639-0098
PO BOX 99, GREENSBORO, MD 21639-0099
PO BOX 100, GREENSBORO, MD 21639-0100
PO BOX 101, GREENSBORO, MD 21639-0101
PO BOX 102, GREENSBORO, MD 21639-0102
PO BOX 103, GREENSBORO, MD 21639-0103
PO BOX 104, GREENSBORO, MD 21639-0104
PO BOX 105, GREENSBORO, MD 21639-0105
PO BOX 106, GREENSBORO, MD 21639-0106
PO BOX 107, GREENSBORO, MD 21639-0107
PO BOX 108, GREENSBORO, MD 21639-0108
PO BOX 109, GREENSBORO, MD 21639-0109
PO BOX 110, GREENSBORO, MD 21639-0110
PO BOX 111, GREENSBORO, MD 21639-0111
PO BOX 112, GREENSBORO, MD 21639-0112
PO BOX 113, GREENSBORO, MD 21639-0113
PO BOX 114, GREENSBORO, MD 21639-0114
PO BOX 115, GREENSBORO, MD 21639-0115
PO BOX 116, GREENSBORO, MD 21639-0116
PO BOX 117, GREENSBORO, MD 21639-0117
PO BOX 118, GREENSBORO, MD 21639-0118
PO BOX 119, GREENSBORO, MD 21639-0119
PO BOX 120, GREENSBORO, MD 21639-0120
PO BOX 121, GREENSBORO, MD 21639-0121
PO BOX 122, GREENSBORO, MD 21639-0122
PO BOX 123, GREENSBORO, MD 21639-0123
PO BOX 124, GREENSBORO, MD 21639-0124
PO BOX 125, GREENSBORO, MD 21639-0125
PO BOX 126, GREENSBORO, MD 21639-0126
PO BOX 127, GREENSBORO, MD 21639-0127
PO BOX 128, GREENSBORO, MD 21639-0128
PO BOX 129, GREENSBORO, MD 21639-0129
PO BOX 130, GREENSBORO, MD 21639-0130
PO BOX 131, GREENSBORO, MD 21639-0131
PO BOX 132, GREENSBORO, MD 21639-0132
PO BOX 133, GREENSBORO, MD 21639-0133
PO BOX 134, GREENSBORO, MD 21639-0134
PO BOX 135, GREENSBORO, MD 21639-0135
PO BOX 136, GREENSBORO, MD 21639-0136
PO BOX 137, GREENSBORO, MD 21639-0137
PO BOX 138, GREENSBORO, MD 21639-0138
PO BOX 139, GREENSBORO, MD 21639-0139
PO BOX 140, GREENSBORO, MD 21639-0140
PO BOX 141, GREENSBORO, MD 21639-0141
PO BOX 142, GREENSBORO, MD 21639-0142
PO BOX 143, GREENSBORO, MD 21639-0143
PO BOX 144, GREENSBORO, MD 21639-0144
PO BOX 145, GREENSBORO, MD 21639-0145
PO BOX 146, GREENSBORO, MD 21639-0146
PO BOX 147, GREENSBORO, MD 21639-0147
PO BOX 148, GREENSBORO, MD 21639-0148
PO BOX 149, GREENSBORO, MD 21639-0149
PO BOX 150, GREENSBORO, MD 21639-0150
PO BOX 151, GREENSBORO, MD 21639-0151
PO BOX 152, GREENSBORO, MD 21639-0152
PO BOX 153, GREENSBORO, MD 21639-0153
PO BOX 154, GREENSBORO, MD 21639-0154
PO BOX 155, GREENSBORO, MD 21639-0155
PO BOX 156, GREENSBORO, MD 21639-0156
PO BOX 157, GREENSBORO, MD 21639-0157
PO BOX 158, GREENSBORO, MD 21639-0158
PO BOX 159, GREENSBORO, MD 21639-0159
PO BOX 160, GREENSBORO, MD 21639-0160
PO BOX 161, GREENSBORO, MD 21639-0161
PO BOX 162, GREENSBORO, MD 21639-0162
PO BOX 163, GREENSBORO, MD 21639-0163
PO BOX 164, GREENSBORO, MD 21639-0164
PO BOX 165, GREENSBORO, MD 21639-0165
PO BOX 166, GREENSBORO, MD 21639-0166
PO BOX 167, GREENSBORO, MD 21639-0167
PO BOX 168, GREENSBORO, MD 21639-0168
PO BOX 169, GREENSBORO, MD 21639-0169
PO BOX 170, GREENSBORO, MD 21639-0170
PO BOX 171, GREENSBORO, MD 21639-0171
PO BOX 172, GREENSBORO, MD 21639-0172
PO BOX 173, GREENSBORO, MD 21639-0173
PO BOX 174, GREENSBORO, MD 21639-0174
PO BOX 175, GREENSBORO, MD 21639-0175
PO BOX 176, GREENSBORO, MD 21639-0176
PO BOX 177, GREENSBORO, MD 21639-0177
PO BOX 178, GREENSBORO, MD 21639-0178
PO BOX 179, GREENSBORO, MD 21639-0179
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