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 910001, SAN DIEGO, CA 92191-0001
PO BOX 910002, SAN DIEGO, CA 92191-0002
PO BOX 910003, SAN DIEGO, CA 92191-0003
PO BOX 910004, SAN DIEGO, CA 92191-0004
PO BOX 910005, SAN DIEGO, CA 92191-0005
PO BOX 910006, SAN DIEGO, CA 92191-0006
PO BOX 910007, SAN DIEGO, CA 92191-0007
PO BOX 910008, SAN DIEGO, CA 92191-0008
PO BOX 910009, SAN DIEGO, CA 92191-0009
PO BOX 910010, SAN DIEGO, CA 92191-0010
PO BOX 910011, SAN DIEGO, CA 92191-0011
PO BOX 910012, SAN DIEGO, CA 92191-0012
PO BOX 910013, SAN DIEGO, CA 92191-0013
PO BOX 910014, SAN DIEGO, CA 92191-0014
PO BOX 910015, SAN DIEGO, CA 92191-0015
PO BOX 910016, SAN DIEGO, CA 92191-0016
PO BOX 910017, SAN DIEGO, CA 92191-0017
PO BOX 910018, SAN DIEGO, CA 92191-0018
PO BOX 910019, SAN DIEGO, CA 92191-0019
PO BOX 910020, SAN DIEGO, CA 92191-0020
PO BOX 910021, SAN DIEGO, CA 92191-0021
PO BOX 910022, SAN DIEGO, CA 92191-0022
PO BOX 910023, SAN DIEGO, CA 92191-0023
PO BOX 910024, SAN DIEGO, CA 92191-0024
PO BOX 910025, SAN DIEGO, CA 92191-0025
PO BOX 910026, SAN DIEGO, CA 92191-0026
PO BOX 910027, SAN DIEGO, CA 92191-0027
PO BOX 910028, SAN DIEGO, CA 92191-0028
PO BOX 910029, SAN DIEGO, CA 92191-0029
PO BOX 910030, SAN DIEGO, CA 92191-0030
PO BOX 910031, SAN DIEGO, CA 92191-0031
PO BOX 910032, SAN DIEGO, CA 92191-0032
PO BOX 910033, SAN DIEGO, CA 92191-0033
PO BOX 910034, SAN DIEGO, CA 92191-0034
PO BOX 910035, SAN DIEGO, CA 92191-0035
PO BOX 910036, SAN DIEGO, CA 92191-0036
PO BOX 910037, SAN DIEGO, CA 92191-0037
PO BOX 910038, SAN DIEGO, CA 92191-0038
PO BOX 910039, SAN DIEGO, CA 92191-0039
PO BOX 910040, SAN DIEGO, CA 92191-0040
PO BOX 910041, SAN DIEGO, CA 92191-0041
PO BOX 910042, SAN DIEGO, CA 92191-0042
PO BOX 910043, SAN DIEGO, CA 92191-0043
PO BOX 910044, SAN DIEGO, CA 92191-0044
PO BOX 910045, SAN DIEGO, CA 92191-0045
PO BOX 910046, SAN DIEGO, CA 92191-0046
PO BOX 910047, SAN DIEGO, CA 92191-0047
PO BOX 910048, SAN DIEGO, CA 92191-0048
PO BOX 910049, SAN DIEGO, CA 92191-0049
PO BOX 910050, SAN DIEGO, CA 92191-0050
PO BOX 910051, SAN DIEGO, CA 92191-0051
PO BOX 910052, SAN DIEGO, CA 92191-0052
PO BOX 910053, SAN DIEGO, CA 92191-0053
PO BOX 910054, SAN DIEGO, CA 92191-0054
PO BOX 910055, SAN DIEGO, CA 92191-0055
PO BOX 910056, SAN DIEGO, CA 92191-0056
PO BOX 910057, SAN DIEGO, CA 92191-0057
PO BOX 910058, SAN DIEGO, CA 92191-0058
PO BOX 910059, SAN DIEGO, CA 92191-0059
PO BOX 910060, SAN DIEGO, CA 92191-0060
PO BOX 910061, SAN DIEGO, CA 92191-0061
PO BOX 910062, SAN DIEGO, CA 92191-0062
PO BOX 910063, SAN DIEGO, CA 92191-0063
PO BOX 910064, SAN DIEGO, CA 92191-0064
PO BOX 910065, SAN DIEGO, CA 92191-0065
PO BOX 910066, SAN DIEGO, CA 92191-0066
PO BOX 910067, SAN DIEGO, CA 92191-0067
PO BOX 910068, SAN DIEGO, CA 92191-0068
PO BOX 910069, SAN DIEGO, CA 92191-0069
PO BOX 910070, SAN DIEGO, CA 92191-0070
PO BOX 910071, SAN DIEGO, CA 92191-0071
PO BOX 910072, SAN DIEGO, CA 92191-0072
PO BOX 910073, SAN DIEGO, CA 92191-0073
PO BOX 910074, SAN DIEGO, CA 92191-0074
PO BOX 910075, SAN DIEGO, CA 92191-0075
PO BOX 910076, SAN DIEGO, CA 92191-0076
PO BOX 910077, SAN DIEGO, CA 92191-0077
PO BOX 910078, SAN DIEGO, CA 92191-0078
PO BOX 910079, SAN DIEGO, CA 92191-0079
PO BOX 910080, SAN DIEGO, CA 92191-0080
PO BOX 910081, SAN DIEGO, CA 92191-0081
PO BOX 910082, SAN DIEGO, CA 92191-0082
PO BOX 910083, SAN DIEGO, CA 92191-0083
PO BOX 910084, SAN DIEGO, CA 92191-0084
PO BOX 910085, SAN DIEGO, CA 92191-0085
PO BOX 910086, SAN DIEGO, CA 92191-0086
PO BOX 910087, SAN DIEGO, CA 92191-0087
PO BOX 910088, SAN DIEGO, CA 92191-0088
PO BOX 910089, SAN DIEGO, CA 92191-0089
PO BOX 910090, SAN DIEGO, CA 92191-0090
PO BOX 910091, SAN DIEGO, CA 92191-0091
PO BOX 910092, SAN DIEGO, CA 92191-0092
PO BOX 910093, SAN DIEGO, CA 92191-0093
PO BOX 910094, SAN DIEGO, CA 92191-0094
PO BOX 910095, SAN DIEGO, CA 92191-0095
PO BOX 910096, SAN DIEGO, CA 92191-0096
PO BOX 910097, SAN DIEGO, CA 92191-0097
PO BOX 910098, SAN DIEGO, CA 92191-0098
PO BOX 910099, SAN DIEGO, CA 92191-0099
PO BOX 910100, SAN DIEGO, CA 92191-0100
PO BOX 910101, SAN DIEGO, CA 92191-0101
PO BOX 910102, SAN DIEGO, CA 92191-0102
PO BOX 910103, SAN DIEGO, CA 92191-0103
PO BOX 910104, SAN DIEGO, CA 92191-0104
PO BOX 910105, SAN DIEGO, CA 92191-0105
PO BOX 910106, SAN DIEGO, CA 92191-0106
PO BOX 910107, SAN DIEGO, CA 92191-0107
PO BOX 910108, SAN DIEGO, CA 92191-0108
PO BOX 910109, SAN DIEGO, CA 92191-0109
PO BOX 910110, SAN DIEGO, CA 92191-0110
PO BOX 910111, SAN DIEGO, CA 92191-0111
PO BOX 910112, SAN DIEGO, CA 92191-0112
PO BOX 910113, SAN DIEGO, CA 92191-0113
PO BOX 910114, SAN DIEGO, CA 92191-0114
PO BOX 910115, SAN DIEGO, CA 92191-0115
PO BOX 910116, SAN DIEGO, CA 92191-0116
PO BOX 910117, SAN DIEGO, CA 92191-0117
PO BOX 910118, SAN DIEGO, CA 92191-0118
PO BOX 910119, SAN DIEGO, CA 92191-0119
PO BOX 910120, SAN DIEGO, CA 92191-0120
PO BOX 910121, SAN DIEGO, CA 92191-0121
PO BOX 910122, SAN DIEGO, CA 92191-0122
PO BOX 910123, SAN DIEGO, CA 92191-0123
PO BOX 910124, SAN DIEGO, CA 92191-0124
PO BOX 910125, SAN DIEGO, CA 92191-0125
PO BOX 910126, SAN DIEGO, CA 92191-0126
PO BOX 910127, SAN DIEGO, CA 92191-0127
PO BOX 910128, SAN DIEGO, CA 92191-0128
PO BOX 910129, SAN DIEGO, CA 92191-0129
PO BOX 910130, SAN DIEGO, CA 92191-0130
PO BOX 910131, SAN DIEGO, CA 92191-0131
PO BOX 910132, SAN DIEGO, CA 92191-0132
PO BOX 910133, SAN DIEGO, CA 92191-0133
PO BOX 910134, SAN DIEGO, CA 92191-0134
PO BOX 910135, SAN DIEGO, CA 92191-0135
PO BOX 910136, SAN DIEGO, CA 92191-0136
PO BOX 910137, SAN DIEGO, CA 92191-0137
PO BOX 910138, SAN DIEGO, CA 92191-0138
PO BOX 910139, SAN DIEGO, CA 92191-0139
PO BOX 910140, SAN DIEGO, CA 92191-0140
PO BOX 910141, SAN DIEGO, CA 92191-0141
PO BOX 910142, SAN DIEGO, CA 92191-0142
PO BOX 910143, SAN DIEGO, CA 92191-0143
PO BOX 910144, SAN DIEGO, CA 92191-0144
PO BOX 910145, SAN DIEGO, CA 92191-0145
PO BOX 910146, SAN DIEGO, CA 92191-0146
PO BOX 910147, SAN DIEGO, CA 92191-0147
PO BOX 910148, SAN DIEGO, CA 92191-0148
PO BOX 910149, SAN DIEGO, CA 92191-0149
PO BOX 910150, SAN DIEGO, CA 92191-0150
PO BOX 910151, SAN DIEGO, CA 92191-0151
PO BOX 910152, SAN DIEGO, CA 92191-0152
PO BOX 910153, SAN DIEGO, CA 92191-0153
PO BOX 910154, SAN DIEGO, CA 92191-0154
PO BOX 910155, SAN DIEGO, CA 92191-0155
PO BOX 910156, SAN DIEGO, CA 92191-0156
PO BOX 910157, SAN DIEGO, CA 92191-0157
PO BOX 910158, SAN DIEGO, CA 92191-0158
PO BOX 910159, SAN DIEGO, CA 92191-0159
PO BOX 910160, SAN DIEGO, CA 92191-0160
PO BOX 910161, SAN DIEGO, CA 92191-0161
PO BOX 910162, SAN DIEGO, CA 92191-0162
PO BOX 910163, SAN DIEGO, CA 92191-0163
PO BOX 910164, SAN DIEGO, CA 92191-0164
PO BOX 910165, SAN DIEGO, CA 92191-0165
PO BOX 910166, SAN DIEGO, CA 92191-0166
PO BOX 910167, SAN DIEGO, CA 92191-0167
PO BOX 910168, SAN DIEGO, CA 92191-0168
PO BOX 910169, SAN DIEGO, CA 92191-0169
PO BOX 910170, SAN DIEGO, CA 92191-0170
PO BOX 910171, SAN DIEGO, CA 92191-0171
PO BOX 910172, SAN DIEGO, CA 92191-0172
PO BOX 910173, SAN DIEGO, CA 92191-0173
PO BOX 910174, SAN DIEGO, CA 92191-0174
PO BOX 910175, SAN DIEGO, CA 92191-0175
PO BOX 910176, SAN DIEGO, CA 92191-0176
PO BOX 910177, SAN DIEGO, CA 92191-0177
PO BOX 910178, SAN DIEGO, CA 92191-0178
PO BOX 910179, SAN DIEGO, CA 92191-0179
PO BOX 910180, SAN DIEGO, CA 92191-0180
PO BOX 910181, SAN DIEGO, CA 92191-0181
PO BOX 910182, SAN DIEGO, CA 92191-0182
PO BOX 910183, SAN DIEGO, CA 92191-0183
PO BOX 910184, SAN DIEGO, CA 92191-0184
PO BOX 910185, SAN DIEGO, CA 92191-0185
PO BOX 910186, SAN DIEGO, CA 92191-0186
PO BOX 910187, SAN DIEGO, CA 92191-0187
PO BOX 910188, SAN DIEGO, CA 92191-0188
PO BOX 910189, SAN DIEGO, CA 92191-0189
PO BOX 910190, SAN DIEGO, CA 92191-0190
PO BOX 910191, SAN DIEGO, CA 92191-0191
PO BOX 910192, SAN DIEGO, CA 92191-0192
PO BOX 910193, SAN DIEGO, CA 92191-0193
PO BOX 910194, SAN DIEGO, CA 92191-0194
PO BOX 910195, SAN DIEGO, CA 92191-0195
PO BOX 910196, SAN DIEGO, CA 92191-0196
PO BOX 910197, SAN DIEGO, CA 92191-0197
PO BOX 910198, SAN DIEGO, CA 92191-0198
PO BOX 910199, SAN DIEGO, CA 92191-0199
PO BOX 910200, SAN DIEGO, CA 92191-0200
PO BOX 910201, SAN DIEGO, CA 92191-0201
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