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 380001, CAMBRIDGE, MA 02238-0001
PO BOX 380002, CAMBRIDGE, MA 02238-0002
PO BOX 380003, CAMBRIDGE, MA 02238-0003
PO BOX 380004, CAMBRIDGE, MA 02238-0004
PO BOX 380005, CAMBRIDGE, MA 02238-0005
PO BOX 380006, CAMBRIDGE, MA 02238-0006
PO BOX 380007, CAMBRIDGE, MA 02238-0007
PO BOX 380008, CAMBRIDGE, MA 02238-0008
PO BOX 380009, CAMBRIDGE, MA 02238-0009
PO BOX 380010, CAMBRIDGE, MA 02238-0010
PO BOX 380011, CAMBRIDGE, MA 02238-0011
PO BOX 380012, CAMBRIDGE, MA 02238-0012
PO BOX 380013, CAMBRIDGE, MA 02238-0013
PO BOX 380014, CAMBRIDGE, MA 02238-0014
PO BOX 380015, CAMBRIDGE, MA 02238-0015
PO BOX 380016, CAMBRIDGE, MA 02238-0016
PO BOX 380017, CAMBRIDGE, MA 02238-0017
PO BOX 380018, CAMBRIDGE, MA 02238-0018
PO BOX 380019, CAMBRIDGE, MA 02238-0019
PO BOX 380020, CAMBRIDGE, MA 02238-0020
PO BOX 380021, CAMBRIDGE, MA 02238-0021
PO BOX 380022, CAMBRIDGE, MA 02238-0022
PO BOX 380023, CAMBRIDGE, MA 02238-0023
PO BOX 380024, CAMBRIDGE, MA 02238-0024
PO BOX 380025, CAMBRIDGE, MA 02238-0025
PO BOX 380026, CAMBRIDGE, MA 02238-0026
PO BOX 380027, CAMBRIDGE, MA 02238-0027
PO BOX 380028, CAMBRIDGE, MA 02238-0028
PO BOX 380029, CAMBRIDGE, MA 02238-0029
PO BOX 380030, CAMBRIDGE, MA 02238-0030
PO BOX 380031, CAMBRIDGE, MA 02238-0031
PO BOX 380032, CAMBRIDGE, MA 02238-0032
PO BOX 380033, CAMBRIDGE, MA 02238-0033
PO BOX 380034, CAMBRIDGE, MA 02238-0034
PO BOX 380035, CAMBRIDGE, MA 02238-0035
PO BOX 380036, CAMBRIDGE, MA 02238-0036
PO BOX 380037, CAMBRIDGE, MA 02238-0037
PO BOX 380038, CAMBRIDGE, MA 02238-0038
PO BOX 380039, CAMBRIDGE, MA 02238-0039
PO BOX 380040, CAMBRIDGE, MA 02238-0040
PO BOX 380041, CAMBRIDGE, MA 02238-0041
PO BOX 380042, CAMBRIDGE, MA 02238-0042
PO BOX 380043, CAMBRIDGE, MA 02238-0043
PO BOX 380044, CAMBRIDGE, MA 02238-0044
PO BOX 380045, CAMBRIDGE, MA 02238-0045
PO BOX 380046, CAMBRIDGE, MA 02238-0046
PO BOX 380047, CAMBRIDGE, MA 02238-0047
PO BOX 380048, CAMBRIDGE, MA 02238-0048
PO BOX 380049, CAMBRIDGE, MA 02238-0049
PO BOX 380050, CAMBRIDGE, MA 02238-0050
PO BOX 380051, CAMBRIDGE, MA 02238-0051
PO BOX 380052, CAMBRIDGE, MA 02238-0052
PO BOX 380053, CAMBRIDGE, MA 02238-0053
PO BOX 380054, CAMBRIDGE, MA 02238-0054
PO BOX 380055, CAMBRIDGE, MA 02238-0055
PO BOX 380056, CAMBRIDGE, MA 02238-0056
PO BOX 380057, CAMBRIDGE, MA 02238-0057
PO BOX 380058, CAMBRIDGE, MA 02238-0058
PO BOX 380059, CAMBRIDGE, MA 02238-0059
PO BOX 380060, CAMBRIDGE, MA 02238-0060
PO BOX 380061, CAMBRIDGE, MA 02238-0061
PO BOX 380062, CAMBRIDGE, MA 02238-0062
PO BOX 380063, CAMBRIDGE, MA 02238-0063
PO BOX 380064, CAMBRIDGE, MA 02238-0064
PO BOX 380065, CAMBRIDGE, MA 02238-0065
PO BOX 380066, CAMBRIDGE, MA 02238-0066
PO BOX 380067, CAMBRIDGE, MA 02238-0067
PO BOX 380068, CAMBRIDGE, MA 02238-0068
PO BOX 380069, CAMBRIDGE, MA 02238-0069
PO BOX 380070, CAMBRIDGE, MA 02238-0070
PO BOX 380071, CAMBRIDGE, MA 02238-0071
PO BOX 380072, CAMBRIDGE, MA 02238-0072
PO BOX 380073, CAMBRIDGE, MA 02238-0073
PO BOX 380074, CAMBRIDGE, MA 02238-0074
PO BOX 380075, CAMBRIDGE, MA 02238-0075
PO BOX 380076, CAMBRIDGE, MA 02238-0076
PO BOX 380077, CAMBRIDGE, MA 02238-0077
PO BOX 380078, CAMBRIDGE, MA 02238-0078
PO BOX 380079, CAMBRIDGE, MA 02238-0079
PO BOX 380080, CAMBRIDGE, MA 02238-0080
PO BOX 380081, CAMBRIDGE, MA 02238-0081
PO BOX 380082, CAMBRIDGE, MA 02238-0082
PO BOX 380083, CAMBRIDGE, MA 02238-0083
PO BOX 380084, CAMBRIDGE, MA 02238-0084
PO BOX 380085, CAMBRIDGE, MA 02238-0085
PO BOX 380086, CAMBRIDGE, MA 02238-0086
PO BOX 380087, CAMBRIDGE, MA 02238-0087
PO BOX 380088, CAMBRIDGE, MA 02238-0088
PO BOX 380089, CAMBRIDGE, MA 02238-0089
PO BOX 380090, CAMBRIDGE, MA 02238-0090
PO BOX 380091, CAMBRIDGE, MA 02238-0091
PO BOX 380092, CAMBRIDGE, MA 02238-0092
PO BOX 380093, CAMBRIDGE, MA 02238-0093
PO BOX 380094, CAMBRIDGE, MA 02238-0094
PO BOX 380095, CAMBRIDGE, MA 02238-0095
PO BOX 380096, CAMBRIDGE, MA 02238-0096
PO BOX 380097, CAMBRIDGE, MA 02238-0097
PO BOX 380098, CAMBRIDGE, MA 02238-0098
PO BOX 380099, CAMBRIDGE, MA 02238-0099
PO BOX 380100, CAMBRIDGE, MA 02238-0100
PO BOX 380101, CAMBRIDGE, MA 02238-0101
PO BOX 380102, CAMBRIDGE, MA 02238-0102
PO BOX 380103, CAMBRIDGE, MA 02238-0103
PO BOX 380104, CAMBRIDGE, MA 02238-0104
PO BOX 380105, CAMBRIDGE, MA 02238-0105
PO BOX 380106, CAMBRIDGE, MA 02238-0106
PO BOX 380107, CAMBRIDGE, MA 02238-0107
PO BOX 380108, CAMBRIDGE, MA 02238-0108
PO BOX 380109, CAMBRIDGE, MA 02238-0109
PO BOX 380110, CAMBRIDGE, MA 02238-0110
PO BOX 380111, CAMBRIDGE, MA 02238-0111
PO BOX 380112, CAMBRIDGE, MA 02238-0112
PO BOX 380113, CAMBRIDGE, MA 02238-0113
PO BOX 380114, CAMBRIDGE, MA 02238-0114
PO BOX 380115, CAMBRIDGE, MA 02238-0115
PO BOX 380116, CAMBRIDGE, MA 02238-0116
PO BOX 380117, CAMBRIDGE, MA 02238-0117
PO BOX 380118, CAMBRIDGE, MA 02238-0118
PO BOX 380119, CAMBRIDGE, MA 02238-0119
PO BOX 380120, CAMBRIDGE, MA 02238-0120
PO BOX 380121, CAMBRIDGE, MA 02238-0121
PO BOX 380122, CAMBRIDGE, MA 02238-0122
PO BOX 380123, CAMBRIDGE, MA 02238-0123
PO BOX 380124, CAMBRIDGE, MA 02238-0124
PO BOX 380125, CAMBRIDGE, MA 02238-0125
PO BOX 380126, CAMBRIDGE, MA 02238-0126
PO BOX 380127, CAMBRIDGE, MA 02238-0127
PO BOX 380128, CAMBRIDGE, MA 02238-0128
PO BOX 380129, CAMBRIDGE, MA 02238-0129
PO BOX 380130, CAMBRIDGE, MA 02238-0130
PO BOX 380131, CAMBRIDGE, MA 02238-0131
PO BOX 380132, CAMBRIDGE, MA 02238-0132
PO BOX 380133, CAMBRIDGE, MA 02238-0133
PO BOX 380134, CAMBRIDGE, MA 02238-0134
PO BOX 380135, CAMBRIDGE, MA 02238-0135
PO BOX 380136, CAMBRIDGE, MA 02238-0136
PO BOX 380137, CAMBRIDGE, MA 02238-0137
PO BOX 380138, CAMBRIDGE, MA 02238-0138
PO BOX 380139, CAMBRIDGE, MA 02238-0139
PO BOX 380140, CAMBRIDGE, MA 02238-0140
PO BOX 380141, CAMBRIDGE, MA 02238-0141
PO BOX 380142, CAMBRIDGE, MA 02238-0142
PO BOX 380143, CAMBRIDGE, MA 02238-0143
PO BOX 380144, CAMBRIDGE, MA 02238-0144
PO BOX 380145, CAMBRIDGE, MA 02238-0145
PO BOX 380146, CAMBRIDGE, MA 02238-0146
PO BOX 380147, CAMBRIDGE, MA 02238-0147
PO BOX 380148, CAMBRIDGE, MA 02238-0148
PO BOX 380149, CAMBRIDGE, MA 02238-0149
PO BOX 380150, CAMBRIDGE, MA 02238-0150
PO BOX 380151, CAMBRIDGE, MA 02238-0151
PO BOX 380152, CAMBRIDGE, MA 02238-0152
PO BOX 380153, CAMBRIDGE, MA 02238-0153
PO BOX 380154, CAMBRIDGE, MA 02238-0154
PO BOX 380155, CAMBRIDGE, MA 02238-0155
PO BOX 380156, CAMBRIDGE, MA 02238-0156
PO BOX 380157, CAMBRIDGE, MA 02238-0157
PO BOX 380158, CAMBRIDGE, MA 02238-0158
PO BOX 380159, CAMBRIDGE, MA 02238-0159
PO BOX 380160, CAMBRIDGE, MA 02238-0160
PO BOX 380161, CAMBRIDGE, MA 02238-0161
PO BOX 380162, CAMBRIDGE, MA 02238-0162
PO BOX 380163, CAMBRIDGE, MA 02238-0163
PO BOX 380164, CAMBRIDGE, MA 02238-0164
PO BOX 380165, CAMBRIDGE, MA 02238-0165
PO BOX 380166, CAMBRIDGE, MA 02238-0166
PO BOX 380167, CAMBRIDGE, MA 02238-0167
PO BOX 380168, CAMBRIDGE, MA 02238-0168
PO BOX 380169, CAMBRIDGE, MA 02238-0169
PO BOX 380170, CAMBRIDGE, MA 02238-0170
PO BOX 380171, CAMBRIDGE, MA 02238-0171
PO BOX 380172, CAMBRIDGE, MA 02238-0172
PO BOX 380173, CAMBRIDGE, MA 02238-0173
PO BOX 380174, CAMBRIDGE, MA 02238-0174
PO BOX 380175, CAMBRIDGE, MA 02238-0175
PO BOX 380176, CAMBRIDGE, MA 02238-0176
PO BOX 380177, CAMBRIDGE, MA 02238-0177
PO BOX 380178, CAMBRIDGE, MA 02238-0178
PO BOX 380179, CAMBRIDGE, MA 02238-0179
PO BOX 380180, CAMBRIDGE, MA 02238-0180
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