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 270001, SAN DIEGO, CA 92198-2001
PO BOX 270002, SAN DIEGO, CA 92198-2002
PO BOX 270003, SAN DIEGO, CA 92198-2003
PO BOX 270004, SAN DIEGO, CA 92198-2004
PO BOX 270005, SAN DIEGO, CA 92198-2005
PO BOX 270006, SAN DIEGO, CA 92198-2006
PO BOX 270007, SAN DIEGO, CA 92198-2007
PO BOX 270008, SAN DIEGO, CA 92198-2008
PO BOX 270009, SAN DIEGO, CA 92198-2009
PO BOX 270010, SAN DIEGO, CA 92198-2010
PO BOX 270011, SAN DIEGO, CA 92198-2011
PO BOX 270012, SAN DIEGO, CA 92198-2012
PO BOX 270013, SAN DIEGO, CA 92198-2013
PO BOX 270014, SAN DIEGO, CA 92198-2014
PO BOX 270015, SAN DIEGO, CA 92198-2015
PO BOX 270016, SAN DIEGO, CA 92198-2016
PO BOX 270017, SAN DIEGO, CA 92198-2017
PO BOX 270018, SAN DIEGO, CA 92198-2018
PO BOX 270019, SAN DIEGO, CA 92198-2019
PO BOX 270020, SAN DIEGO, CA 92198-2020
PO BOX 270021, SAN DIEGO, CA 92198-2021
PO BOX 270022, SAN DIEGO, CA 92198-2022
PO BOX 270023, SAN DIEGO, CA 92198-2023
PO BOX 270024, SAN DIEGO, CA 92198-2024
PO BOX 270025, SAN DIEGO, CA 92198-2025
PO BOX 270026, SAN DIEGO, CA 92198-2026
PO BOX 270027, SAN DIEGO, CA 92198-2027
PO BOX 270028, SAN DIEGO, CA 92198-2028
PO BOX 270029, SAN DIEGO, CA 92198-2029
PO BOX 270030, SAN DIEGO, CA 92198-2030
PO BOX 270031, SAN DIEGO, CA 92198-2031
PO BOX 270032, SAN DIEGO, CA 92198-2032
PO BOX 270033, SAN DIEGO, CA 92198-2033
PO BOX 270034, SAN DIEGO, CA 92198-2034
PO BOX 270035, SAN DIEGO, CA 92198-2035
PO BOX 270036, SAN DIEGO, CA 92198-2036
PO BOX 270037, SAN DIEGO, CA 92198-2037
PO BOX 270038, SAN DIEGO, CA 92198-2038
PO BOX 270039, SAN DIEGO, CA 92198-2039
PO BOX 270040, SAN DIEGO, CA 92198-2040
PO BOX 270041, SAN DIEGO, CA 92198-2041
PO BOX 270042, SAN DIEGO, CA 92198-2042
PO BOX 270043, SAN DIEGO, CA 92198-2043
PO BOX 270044, SAN DIEGO, CA 92198-2044
PO BOX 270045, SAN DIEGO, CA 92198-2045
PO BOX 270046, SAN DIEGO, CA 92198-2046
PO BOX 270047, SAN DIEGO, CA 92198-2047
PO BOX 270048, SAN DIEGO, CA 92198-2048
PO BOX 270049, SAN DIEGO, CA 92198-2049
PO BOX 270050, SAN DIEGO, CA 92198-2050
PO BOX 270051, SAN DIEGO, CA 92198-2051
PO BOX 270052, SAN DIEGO, CA 92198-2052
PO BOX 270053, SAN DIEGO, CA 92198-2053
PO BOX 270054, SAN DIEGO, CA 92198-2054
PO BOX 270055, SAN DIEGO, CA 92198-2055
PO BOX 270056, SAN DIEGO, CA 92198-2056
PO BOX 270057, SAN DIEGO, CA 92198-2057
PO BOX 270058, SAN DIEGO, CA 92198-2058
PO BOX 270059, SAN DIEGO, CA 92198-2059
PO BOX 270060, SAN DIEGO, CA 92198-2060
PO BOX 270061, SAN DIEGO, CA 92198-2061
PO BOX 270062, SAN DIEGO, CA 92198-2062
PO BOX 270063, SAN DIEGO, CA 92198-2063
PO BOX 270064, SAN DIEGO, CA 92198-2064
PO BOX 270065, SAN DIEGO, CA 92198-2065
PO BOX 270066, SAN DIEGO, CA 92198-2066
PO BOX 270067, SAN DIEGO, CA 92198-2067
PO BOX 270068, SAN DIEGO, CA 92198-2068
PO BOX 270069, SAN DIEGO, CA 92198-2069
PO BOX 270070, SAN DIEGO, CA 92198-2070
PO BOX 270071, SAN DIEGO, CA 92198-2071
PO BOX 270072, SAN DIEGO, CA 92198-2072
PO BOX 270073, SAN DIEGO, CA 92198-2073
PO BOX 270074, SAN DIEGO, CA 92198-2074
PO BOX 270075, SAN DIEGO, CA 92198-2075
PO BOX 270076, SAN DIEGO, CA 92198-2076
PO BOX 270077, SAN DIEGO, CA 92198-2077
PO BOX 270078, SAN DIEGO, CA 92198-2078
PO BOX 270079, SAN DIEGO, CA 92198-2079
PO BOX 270080, SAN DIEGO, CA 92198-2080
PO BOX 270081, SAN DIEGO, CA 92198-2081
PO BOX 270082, SAN DIEGO, CA 92198-2082
PO BOX 270083, SAN DIEGO, CA 92198-2083
PO BOX 270084, SAN DIEGO, CA 92198-2084
PO BOX 270085, SAN DIEGO, CA 92198-2085
PO BOX 270086, SAN DIEGO, CA 92198-2086
PO BOX 270087, SAN DIEGO, CA 92198-2087
PO BOX 270088, SAN DIEGO, CA 92198-2088
PO BOX 270089, SAN DIEGO, CA 92198-2089
PO BOX 270090, SAN DIEGO, CA 92198-2090
PO BOX 270091, SAN DIEGO, CA 92198-2091
PO BOX 270092, SAN DIEGO, CA 92198-2092
PO BOX 270093, SAN DIEGO, CA 92198-2093
PO BOX 270094, SAN DIEGO, CA 92198-2094
PO BOX 270095, SAN DIEGO, CA 92198-2095
PO BOX 270096, SAN DIEGO, CA 92198-2096
PO BOX 270097, SAN DIEGO, CA 92198-2097
PO BOX 270098, SAN DIEGO, CA 92198-2098
PO BOX 270099, SAN DIEGO, CA 92198-2099
PO BOX 270100, SAN DIEGO, CA 92198-2100
PO BOX 270101, SAN DIEGO, CA 92198-2101
PO BOX 270102, SAN DIEGO, CA 92198-2102
PO BOX 270103, SAN DIEGO, CA 92198-2103
PO BOX 270104, SAN DIEGO, CA 92198-2104
PO BOX 270105, SAN DIEGO, CA 92198-2105
PO BOX 270106, SAN DIEGO, CA 92198-2106
PO BOX 270107, SAN DIEGO, CA 92198-2107
PO BOX 270108, SAN DIEGO, CA 92198-2108
PO BOX 270109, SAN DIEGO, CA 92198-2109
PO BOX 270110, SAN DIEGO, CA 92198-2110
PO BOX 270111, SAN DIEGO, CA 92198-2111
PO BOX 270112, SAN DIEGO, CA 92198-2112
PO BOX 270113, SAN DIEGO, CA 92198-2113
PO BOX 270114, SAN DIEGO, CA 92198-2114
PO BOX 270115, SAN DIEGO, CA 92198-2115
PO BOX 270116, SAN DIEGO, CA 92198-2116
PO BOX 270117, SAN DIEGO, CA 92198-2117
PO BOX 270118, SAN DIEGO, CA 92198-2118
PO BOX 270119, SAN DIEGO, CA 92198-2119
PO BOX 270120, SAN DIEGO, CA 92198-2120
PO BOX 270121, SAN DIEGO, CA 92198-2121
PO BOX 270122, SAN DIEGO, CA 92198-2122
PO BOX 270123, SAN DIEGO, CA 92198-2123
PO BOX 270124, SAN DIEGO, CA 92198-2124
PO BOX 270125, SAN DIEGO, CA 92198-2125
PO BOX 270126, SAN DIEGO, CA 92198-2126
PO BOX 270127, SAN DIEGO, CA 92198-2127
PO BOX 270128, SAN DIEGO, CA 92198-2128
PO BOX 270129, SAN DIEGO, CA 92198-2129
PO BOX 270130, SAN DIEGO, CA 92198-2130
PO BOX 270131, SAN DIEGO, CA 92198-2131
PO BOX 270132, SAN DIEGO, CA 92198-2132
PO BOX 270133, SAN DIEGO, CA 92198-2133
PO BOX 270134, SAN DIEGO, CA 92198-2134
PO BOX 270135, SAN DIEGO, CA 92198-2135
PO BOX 270136, SAN DIEGO, CA 92198-2136
PO BOX 270137, SAN DIEGO, CA 92198-2137
PO BOX 270138, SAN DIEGO, CA 92198-2138
PO BOX 270139, SAN DIEGO, CA 92198-2139
PO BOX 270140, SAN DIEGO, CA 92198-2140
PO BOX 270141, SAN DIEGO, CA 92198-2141
PO BOX 270142, SAN DIEGO, CA 92198-2142
PO BOX 270143, SAN DIEGO, CA 92198-2143
PO BOX 270144, SAN DIEGO, CA 92198-2144
PO BOX 270145, SAN DIEGO, CA 92198-2145
PO BOX 270146, SAN DIEGO, CA 92198-2146
PO BOX 270147, SAN DIEGO, CA 92198-2147
PO BOX 270148, SAN DIEGO, CA 92198-2148
PO BOX 270149, SAN DIEGO, CA 92198-2149
PO BOX 270150, SAN DIEGO, CA 92198-2150
PO BOX 270151, SAN DIEGO, CA 92198-2151
PO BOX 270152, SAN DIEGO, CA 92198-2152
PO BOX 270153, SAN DIEGO, CA 92198-2153
PO BOX 270154, SAN DIEGO, CA 92198-2154
PO BOX 270155, SAN DIEGO, CA 92198-2155
PO BOX 270156, SAN DIEGO, CA 92198-2156
PO BOX 270157, SAN DIEGO, CA 92198-2157
PO BOX 270158, SAN DIEGO, CA 92198-2158
PO BOX 270159, SAN DIEGO, CA 92198-2159
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