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 436000, SAN YSIDRO, CA 92143-6000
PO BOX 436001, SAN YSIDRO, CA 92143-6001
PO BOX 436002, SAN YSIDRO, CA 92143-6002
PO BOX 436003, SAN YSIDRO, CA 92143-6003
PO BOX 436004, SAN YSIDRO, CA 92143-6004
PO BOX 436005, SAN YSIDRO, CA 92143-6005
PO BOX 436006, SAN YSIDRO, CA 92143-6006
PO BOX 436007, SAN YSIDRO, CA 92143-6007
PO BOX 436008, SAN YSIDRO, CA 92143-6008
PO BOX 436009, SAN YSIDRO, CA 92143-6009
PO BOX 436010, SAN YSIDRO, CA 92143-6010
PO BOX 436011, SAN YSIDRO, CA 92143-6011
PO BOX 436012, SAN YSIDRO, CA 92143-6012
PO BOX 436013, SAN YSIDRO, CA 92143-6013
PO BOX 436014, SAN YSIDRO, CA 92143-6014
PO BOX 436015, SAN YSIDRO, CA 92143-6015
PO BOX 436016, SAN YSIDRO, CA 92143-6016
PO BOX 436017, SAN YSIDRO, CA 92143-6017
PO BOX 436018, SAN YSIDRO, CA 92143-6018
PO BOX 436019, SAN YSIDRO, CA 92143-6019
PO BOX 436020, SAN YSIDRO, CA 92143-6020
PO BOX 436021, SAN YSIDRO, CA 92143-6021
PO BOX 436022, SAN YSIDRO, CA 92143-6022
PO BOX 436023, SAN YSIDRO, CA 92143-6023
PO BOX 436024, SAN YSIDRO, CA 92143-6024
PO BOX 436025, SAN YSIDRO, CA 92143-6025
PO BOX 436026, SAN YSIDRO, CA 92143-6026
PO BOX 436027, SAN YSIDRO, CA 92143-6027
PO BOX 436028, SAN YSIDRO, CA 92143-6028
PO BOX 436029, SAN YSIDRO, CA 92143-6029
PO BOX 436030, SAN YSIDRO, CA 92143-6030
PO BOX 436031, SAN YSIDRO, CA 92143-6031
PO BOX 436032, SAN YSIDRO, CA 92143-6032
PO BOX 436033, SAN YSIDRO, CA 92143-6033
PO BOX 436034, SAN YSIDRO, CA 92143-6034
PO BOX 436035, SAN YSIDRO, CA 92143-6035
PO BOX 436036, SAN YSIDRO, CA 92143-6036
PO BOX 436037, SAN YSIDRO, CA 92143-6037
PO BOX 436038, SAN YSIDRO, CA 92143-6038
PO BOX 436039, SAN YSIDRO, CA 92143-6039
PO BOX 436040, SAN YSIDRO, CA 92143-6040
PO BOX 436041, SAN YSIDRO, CA 92143-6041
PO BOX 436042, SAN YSIDRO, CA 92143-6042
PO BOX 436043, SAN YSIDRO, CA 92143-6043
PO BOX 436044, SAN YSIDRO, CA 92143-6044
PO BOX 436045, SAN YSIDRO, CA 92143-6045
PO BOX 436046, SAN YSIDRO, CA 92143-6046
PO BOX 436047, SAN YSIDRO, CA 92143-6047
PO BOX 436048, SAN YSIDRO, CA 92143-6048
PO BOX 436049, SAN YSIDRO, CA 92143-6049
PO BOX 436050, SAN YSIDRO, CA 92143-6050
PO BOX 436051, SAN YSIDRO, CA 92143-6051
PO BOX 436052, SAN YSIDRO, CA 92143-6052
PO BOX 436053, SAN YSIDRO, CA 92143-6053
PO BOX 436054, SAN YSIDRO, CA 92143-6054
PO BOX 436055, SAN YSIDRO, CA 92143-6055
PO BOX 436056, SAN YSIDRO, CA 92143-6056
PO BOX 436057, SAN YSIDRO, CA 92143-6057
PO BOX 436058, SAN YSIDRO, CA 92143-6058
PO BOX 436059, SAN YSIDRO, CA 92143-6059
PO BOX 436060, SAN YSIDRO, CA 92143-6060
PO BOX 436061, SAN YSIDRO, CA 92143-6061
PO BOX 436062, SAN YSIDRO, CA 92143-6062
PO BOX 436063, SAN YSIDRO, CA 92143-6063
PO BOX 436064, SAN YSIDRO, CA 92143-6064
PO BOX 436065, SAN YSIDRO, CA 92143-6065
PO BOX 436066, SAN YSIDRO, CA 92143-6066
PO BOX 436067, SAN YSIDRO, CA 92143-6067
PO BOX 436068, SAN YSIDRO, CA 92143-6068
PO BOX 436069, SAN YSIDRO, CA 92143-6069
PO BOX 436070, SAN YSIDRO, CA 92143-6070
PO BOX 436071, SAN YSIDRO, CA 92143-6071
PO BOX 436072, SAN YSIDRO, CA 92143-6072
PO BOX 436073, SAN YSIDRO, CA 92143-6073
PO BOX 436074, SAN YSIDRO, CA 92143-6074
PO BOX 436075, SAN YSIDRO, CA 92143-6075
PO BOX 436076, SAN YSIDRO, CA 92143-6076
PO BOX 436077, SAN YSIDRO, CA 92143-6077
PO BOX 436078, SAN YSIDRO, CA 92143-6078
PO BOX 436079, SAN YSIDRO, CA 92143-6079
PO BOX 436080, SAN YSIDRO, CA 92143-6080
PO BOX 436081, SAN YSIDRO, CA 92143-6081
PO BOX 436082, SAN YSIDRO, CA 92143-6082
PO BOX 436083, SAN YSIDRO, CA 92143-6083
PO BOX 436084, SAN YSIDRO, CA 92143-6084
PO BOX 436085, SAN YSIDRO, CA 92143-6085
PO BOX 436086, SAN YSIDRO, CA 92143-6086
PO BOX 436087, SAN YSIDRO, CA 92143-6087
PO BOX 436088, SAN YSIDRO, CA 92143-6088
PO BOX 436089, SAN YSIDRO, CA 92143-6089
PO BOX 436090, SAN YSIDRO, CA 92143-6090
PO BOX 436091, SAN YSIDRO, CA 92143-6091
PO BOX 436092, SAN YSIDRO, CA 92143-6092
PO BOX 436093, SAN YSIDRO, CA 92143-6093
PO BOX 436094, SAN YSIDRO, CA 92143-6094
PO BOX 436095, SAN YSIDRO, CA 92143-6095
PO BOX 436096, SAN YSIDRO, CA 92143-6096
PO BOX 436097, SAN YSIDRO, CA 92143-6097
PO BOX 436098, SAN YSIDRO, CA 92143-6098
PO BOX 436099, SAN YSIDRO, CA 92143-6099
PO BOX 436100, SAN YSIDRO, CA 92143-6100
PO BOX 436101, SAN YSIDRO, CA 92143-6101
PO BOX 436102, SAN YSIDRO, CA 92143-6102
PO BOX 436103, SAN YSIDRO, CA 92143-6103
PO BOX 436104, SAN YSIDRO, CA 92143-6104
PO BOX 436105, SAN YSIDRO, CA 92143-6105
PO BOX 436106, SAN YSIDRO, CA 92143-6106
PO BOX 436107, SAN YSIDRO, CA 92143-6107
PO BOX 436108, SAN YSIDRO, CA 92143-6108
PO BOX 436109, SAN YSIDRO, CA 92143-6109
PO BOX 436110, SAN YSIDRO, CA 92143-6110
PO BOX 436111, SAN YSIDRO, CA 92143-6111
PO BOX 436112, SAN YSIDRO, CA 92143-6112
PO BOX 436113, SAN YSIDRO, CA 92143-6113
PO BOX 436114, SAN YSIDRO, CA 92143-6114
PO BOX 436115, SAN YSIDRO, CA 92143-6115
PO BOX 436116, SAN YSIDRO, CA 92143-6116
PO BOX 436117, SAN YSIDRO, CA 92143-6117
PO BOX 436118, SAN YSIDRO, CA 92143-6118
PO BOX 436119, SAN YSIDRO, CA 92143-6119
PO BOX 436120, SAN YSIDRO, CA 92143-6120
PO BOX 436121, SAN YSIDRO, CA 92143-6121
PO BOX 436122, SAN YSIDRO, CA 92143-6122
PO BOX 436123, SAN YSIDRO, CA 92143-6123
PO BOX 436124, SAN YSIDRO, CA 92143-6124
PO BOX 436125, SAN YSIDRO, CA 92143-6125
PO BOX 436126, SAN YSIDRO, CA 92143-6126
PO BOX 436127, SAN YSIDRO, CA 92143-6127
PO BOX 436128, SAN YSIDRO, CA 92143-6128
PO BOX 436129, SAN YSIDRO, CA 92143-6129
PO BOX 436130, SAN YSIDRO, CA 92143-6130
PO BOX 436131, SAN YSIDRO, CA 92143-6131
PO BOX 436132, SAN YSIDRO, CA 92143-6132
PO BOX 436133, SAN YSIDRO, CA 92143-6133
PO BOX 436134, SAN YSIDRO, CA 92143-6134
PO BOX 436135, SAN YSIDRO, CA 92143-6135
PO BOX 436136, SAN YSIDRO, CA 92143-6136
PO BOX 436137, SAN YSIDRO, CA 92143-6137
PO BOX 436138, SAN YSIDRO, CA 92143-6138
PO BOX 436139, SAN YSIDRO, CA 92143-6139
PO BOX 436140, SAN YSIDRO, CA 92143-6140
PO BOX 436141, SAN YSIDRO, CA 92143-6141
PO BOX 436142, SAN YSIDRO, CA 92143-6142
PO BOX 436143, SAN YSIDRO, CA 92143-6143
PO BOX 436144, SAN YSIDRO, CA 92143-6144
PO BOX 436145, SAN YSIDRO, CA 92143-6145
PO BOX 436146, SAN YSIDRO, CA 92143-6146
PO BOX 436147, SAN YSIDRO, CA 92143-6147
PO BOX 436148, SAN YSIDRO, CA 92143-6148
PO BOX 436149, SAN YSIDRO, CA 92143-6149
PO BOX 436150, SAN YSIDRO, CA 92143-6150
PO BOX 436151, SAN YSIDRO, CA 92143-6151
PO BOX 436152, SAN YSIDRO, CA 92143-6152
PO BOX 436153, SAN YSIDRO, CA 92143-6153
PO BOX 436154, SAN YSIDRO, CA 92143-6154
PO BOX 436155, SAN YSIDRO, CA 92143-6155
PO BOX 436156, SAN YSIDRO, CA 92143-6156
PO BOX 436157, SAN YSIDRO, CA 92143-6157
PO BOX 436158, SAN YSIDRO, CA 92143-6158
PO BOX 436159, SAN YSIDRO, CA 92143-6159
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