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, CAMBRIDGE, MD 21613-0001
PO BOX 2, CAMBRIDGE, MD 21613-0002
PO BOX 3, CAMBRIDGE, MD 21613-0003
PO BOX 4, CAMBRIDGE, MD 21613-0004
PO BOX 5, CAMBRIDGE, MD 21613-0005
PO BOX 6, CAMBRIDGE, MD 21613-0006
PO BOX 7, CAMBRIDGE, MD 21613-0007
PO BOX 8, CAMBRIDGE, MD 21613-0008
PO BOX 9, CAMBRIDGE, MD 21613-0009
PO BOX 10, CAMBRIDGE, MD 21613-0010
PO BOX 11, CAMBRIDGE, MD 21613-0011
PO BOX 12, CAMBRIDGE, MD 21613-0012
PO BOX 13, CAMBRIDGE, MD 21613-0013
PO BOX 14, CAMBRIDGE, MD 21613-0014
PO BOX 15, CAMBRIDGE, MD 21613-0015
PO BOX 16, CAMBRIDGE, MD 21613-0016
PO BOX 17, CAMBRIDGE, MD 21613-0017
PO BOX 18, CAMBRIDGE, MD 21613-0018
PO BOX 19, CAMBRIDGE, MD 21613-0019
PO BOX 20, CAMBRIDGE, MD 21613-0020
PO BOX 21, CAMBRIDGE, MD 21613-0021
PO BOX 22, CAMBRIDGE, MD 21613-0022
PO BOX 23, CAMBRIDGE, MD 21613-0023
PO BOX 24, CAMBRIDGE, MD 21613-0024
PO BOX 25, CAMBRIDGE, MD 21613-0025
PO BOX 26, CAMBRIDGE, MD 21613-0026
PO BOX 27, CAMBRIDGE, MD 21613-0027
PO BOX 28, CAMBRIDGE, MD 21613-0028
PO BOX 29, CAMBRIDGE, MD 21613-0029
PO BOX 30, CAMBRIDGE, MD 21613-0030
PO BOX 31, CAMBRIDGE, MD 21613-0031
PO BOX 32, CAMBRIDGE, MD 21613-0032
PO BOX 33, CAMBRIDGE, MD 21613-0033
PO BOX 34, CAMBRIDGE, MD 21613-0034
PO BOX 35, CAMBRIDGE, MD 21613-0035
PO BOX 36, CAMBRIDGE, MD 21613-0036
PO BOX 37, CAMBRIDGE, MD 21613-0037
PO BOX 38, CAMBRIDGE, MD 21613-0038
PO BOX 39, CAMBRIDGE, MD 21613-0039
PO BOX 40, CAMBRIDGE, MD 21613-0040
PO BOX 41, CAMBRIDGE, MD 21613-0041
PO BOX 42, CAMBRIDGE, MD 21613-0042
PO BOX 43, CAMBRIDGE, MD 21613-0043
PO BOX 44, CAMBRIDGE, MD 21613-0044
PO BOX 45, CAMBRIDGE, MD 21613-0045
PO BOX 46, CAMBRIDGE, MD 21613-0046
PO BOX 47, CAMBRIDGE, MD 21613-0047
PO BOX 48, CAMBRIDGE, MD 21613-0048
PO BOX 49, CAMBRIDGE, MD 21613-0049
PO BOX 50, CAMBRIDGE, MD 21613-0050
PO BOX 51, CAMBRIDGE, MD 21613-0051
PO BOX 52, CAMBRIDGE, MD 21613-0052
PO BOX 53, CAMBRIDGE, MD 21613-0053
PO BOX 54, CAMBRIDGE, MD 21613-0054
PO BOX 55, CAMBRIDGE, MD 21613-0055
PO BOX 56, CAMBRIDGE, MD 21613-0056
PO BOX 57, CAMBRIDGE, MD 21613-0057
PO BOX 58, CAMBRIDGE, MD 21613-0058
PO BOX 59, CAMBRIDGE, MD 21613-0059
PO BOX 60, CAMBRIDGE, MD 21613-0060
PO BOX 61, CAMBRIDGE, MD 21613-0061
PO BOX 62, CAMBRIDGE, MD 21613-0062
PO BOX 63, CAMBRIDGE, MD 21613-0063
PO BOX 64, CAMBRIDGE, MD 21613-0064
PO BOX 65, CAMBRIDGE, MD 21613-0065
PO BOX 66, CAMBRIDGE, MD 21613-0066
PO BOX 67, CAMBRIDGE, MD 21613-0067
PO BOX 68, CAMBRIDGE, MD 21613-0068
PO BOX 69, CAMBRIDGE, MD 21613-0069
PO BOX 70, CAMBRIDGE, MD 21613-0070
PO BOX 71, CAMBRIDGE, MD 21613-0071
PO BOX 72, CAMBRIDGE, MD 21613-0072
PO BOX 73, CAMBRIDGE, MD 21613-0073
PO BOX 74, CAMBRIDGE, MD 21613-0074
PO BOX 75, CAMBRIDGE, MD 21613-0075
PO BOX 76, CAMBRIDGE, MD 21613-0076
PO BOX 77, CAMBRIDGE, MD 21613-0077
PO BOX 78, CAMBRIDGE, MD 21613-0078
PO BOX 79, CAMBRIDGE, MD 21613-0079
PO BOX 80, CAMBRIDGE, MD 21613-0080
PO BOX 81, CAMBRIDGE, MD 21613-0081
PO BOX 82, CAMBRIDGE, MD 21613-0082
PO BOX 83, CAMBRIDGE, MD 21613-0083
PO BOX 84, CAMBRIDGE, MD 21613-0084
PO BOX 85, CAMBRIDGE, MD 21613-0085
PO BOX 86, CAMBRIDGE, MD 21613-0086
PO BOX 87, CAMBRIDGE, MD 21613-0087
PO BOX 88, CAMBRIDGE, MD 21613-0088
PO BOX 89, CAMBRIDGE, MD 21613-0089
PO BOX 90, CAMBRIDGE, MD 21613-0090
PO BOX 91, CAMBRIDGE, MD 21613-0091
PO BOX 92, CAMBRIDGE, MD 21613-0092
PO BOX 93, CAMBRIDGE, MD 21613-0093
PO BOX 94, CAMBRIDGE, MD 21613-0094
PO BOX 95, CAMBRIDGE, MD 21613-0095
PO BOX 96, CAMBRIDGE, MD 21613-0096
PO BOX 97, CAMBRIDGE, MD 21613-0097
PO BOX 98, CAMBRIDGE, MD 21613-0098
PO BOX 99, CAMBRIDGE, MD 21613-0099
PO BOX 100, CAMBRIDGE, MD 21613-0100
PO BOX 101, CAMBRIDGE, MD 21613-0101
PO BOX 102, CAMBRIDGE, MD 21613-0102
PO BOX 103, CAMBRIDGE, MD 21613-0103
PO BOX 104, CAMBRIDGE, MD 21613-0104
PO BOX 105, CAMBRIDGE, MD 21613-0105
PO BOX 106, CAMBRIDGE, MD 21613-0106
PO BOX 107, CAMBRIDGE, MD 21613-0107
PO BOX 108, CAMBRIDGE, MD 21613-0108
PO BOX 109, CAMBRIDGE, MD 21613-0109
PO BOX 110, CAMBRIDGE, MD 21613-0110
PO BOX 111, CAMBRIDGE, MD 21613-0111
PO BOX 112, CAMBRIDGE, MD 21613-0112
PO BOX 113, CAMBRIDGE, MD 21613-0113
PO BOX 114, CAMBRIDGE, MD 21613-0114
PO BOX 115, CAMBRIDGE, MD 21613-0115
PO BOX 116, CAMBRIDGE, MD 21613-0116
PO BOX 117, CAMBRIDGE, MD 21613-0117
PO BOX 118, CAMBRIDGE, MD 21613-0118
PO BOX 119, CAMBRIDGE, MD 21613-0119
PO BOX 120, CAMBRIDGE, MD 21613-0120
PO BOX 121, CAMBRIDGE, MD 21613-0121
PO BOX 122, CAMBRIDGE, MD 21613-0122
PO BOX 123, CAMBRIDGE, MD 21613-0123
PO BOX 124, CAMBRIDGE, MD 21613-0124
PO BOX 125, CAMBRIDGE, MD 21613-0125
PO BOX 126, CAMBRIDGE, MD 21613-0126
PO BOX 127, CAMBRIDGE, MD 21613-0127
PO BOX 128, CAMBRIDGE, MD 21613-0128
PO BOX 129, CAMBRIDGE, MD 21613-0129
PO BOX 130, CAMBRIDGE, MD 21613-0130
PO BOX 131, CAMBRIDGE, MD 21613-0131
PO BOX 132, CAMBRIDGE, MD 21613-0132
PO BOX 133, CAMBRIDGE, MD 21613-0133
PO BOX 134, CAMBRIDGE, MD 21613-0134
PO BOX 135, CAMBRIDGE, MD 21613-0135
PO BOX 136, CAMBRIDGE, MD 21613-0136
PO BOX 137, CAMBRIDGE, MD 21613-0137
PO BOX 138, CAMBRIDGE, MD 21613-0138
PO BOX 139, CAMBRIDGE, MD 21613-0139
PO BOX 140, CAMBRIDGE, MD 21613-0140
PO BOX 141, CAMBRIDGE, MD 21613-0141
PO BOX 142, CAMBRIDGE, MD 21613-0142
PO BOX 143, CAMBRIDGE, MD 21613-0143
PO BOX 144, CAMBRIDGE, MD 21613-0144
PO BOX 145, CAMBRIDGE, MD 21613-0145
PO BOX 146, CAMBRIDGE, MD 21613-0146
PO BOX 147, CAMBRIDGE, MD 21613-0147
PO BOX 148, CAMBRIDGE, MD 21613-0148
PO BOX 149, CAMBRIDGE, MD 21613-0149
PO BOX 150, CAMBRIDGE, MD 21613-0150
PO BOX 151, CAMBRIDGE, MD 21613-0151
PO BOX 152, CAMBRIDGE, MD 21613-0152
PO BOX 153, CAMBRIDGE, MD 21613-0153
PO BOX 154, CAMBRIDGE, MD 21613-0154
PO BOX 155, CAMBRIDGE, MD 21613-0155
PO BOX 156, CAMBRIDGE, MD 21613-0156
PO BOX 157, CAMBRIDGE, MD 21613-0157
PO BOX 158, CAMBRIDGE, MD 21613-0158
PO BOX 159, CAMBRIDGE, MD 21613-0159
PO BOX 160, CAMBRIDGE, MD 21613-0160
PO BOX 161, CAMBRIDGE, MD 21613-0161
PO BOX 162, CAMBRIDGE, MD 21613-0162
PO BOX 163, CAMBRIDGE, MD 21613-0163
PO BOX 164, CAMBRIDGE, MD 21613-0164
PO BOX 165, CAMBRIDGE, MD 21613-0165
PO BOX 166, CAMBRIDGE, MD 21613-0166
PO BOX 167, CAMBRIDGE, MD 21613-0167
PO BOX 168, CAMBRIDGE, MD 21613-0168
PO BOX 169, CAMBRIDGE, MD 21613-0169
PO BOX 170, CAMBRIDGE, MD 21613-0170
PO BOX 171, CAMBRIDGE, MD 21613-0171
PO BOX 172, CAMBRIDGE, MD 21613-0172
PO BOX 173, CAMBRIDGE, MD 21613-0173
PO BOX 174, CAMBRIDGE, MD 21613-0174
PO BOX 175, CAMBRIDGE, MD 21613-0175
PO BOX 176, CAMBRIDGE, MD 21613-0176
PO BOX 177, CAMBRIDGE, MD 21613-0177
PO BOX 178, CAMBRIDGE, MD 21613-0178
PO BOX 179, CAMBRIDGE, MD 21613-0179
PO BOX 180, CAMBRIDGE, MD 21613-0180
PO BOX 181, CAMBRIDGE, MD 21613-0181
PO BOX 182, CAMBRIDGE, MD 21613-0182
PO BOX 183, CAMBRIDGE, MD 21613-0183
PO BOX 184, CAMBRIDGE, MD 21613-0184
PO BOX 185, CAMBRIDGE, MD 21613-0185
PO BOX 186, CAMBRIDGE, MD 21613-0186
PO BOX 187, CAMBRIDGE, MD 21613-0187
PO BOX 188, CAMBRIDGE, MD 21613-0188
PO BOX 189, CAMBRIDGE, MD 21613-0189
PO BOX 190, CAMBRIDGE, MD 21613-0190
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