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 1981, SAN MARCOS, CA 92079-1981
PO BOX 1982, SAN MARCOS, CA 92079-1982
PO BOX 1983, SAN MARCOS, CA 92079-1983
PO BOX 1984, SAN MARCOS, CA 92079-1984
PO BOX 1985, SAN MARCOS, CA 92079-1985
PO BOX 1986, SAN MARCOS, CA 92079-1986
PO BOX 1987, SAN MARCOS, CA 92079-1987
PO BOX 1988, SAN MARCOS, CA 92079-1988
PO BOX 1989, SAN MARCOS, CA 92079-1989
PO BOX 1990, SAN MARCOS, CA 92079-1990
PO BOX 1991, SAN MARCOS, CA 92079-1991
PO BOX 1992, SAN MARCOS, CA 92079-1992
PO BOX 1993, SAN MARCOS, CA 92079-1993
PO BOX 1994, SAN MARCOS, CA 92079-1994
PO BOX 1995, SAN MARCOS, CA 92079-1995
PO BOX 1996, SAN MARCOS, CA 92079-1996
PO BOX 1997, SAN MARCOS, CA 92079-1997
PO BOX 1998, SAN MARCOS, CA 92079-1998
PO BOX 1999, SAN MARCOS, CA 92079-1999
PO BOX 2000, SAN MARCOS, CA 92079-2000
PO BOX 2001, SAN MARCOS, CA 92079-2001
PO BOX 2002, SAN MARCOS, CA 92079-2002
PO BOX 2003, SAN MARCOS, CA 92079-2003
PO BOX 2004, SAN MARCOS, CA 92079-2004
PO BOX 2005, SAN MARCOS, CA 92079-2005
PO BOX 2006, SAN MARCOS, CA 92079-2006
PO BOX 2007, SAN MARCOS, CA 92079-2007
PO BOX 2008, SAN MARCOS, CA 92079-2008
PO BOX 2009, SAN MARCOS, CA 92079-2009
PO BOX 2010, SAN MARCOS, CA 92079-2010
PO BOX 2011, SAN MARCOS, CA 92079-2011
PO BOX 2012, SAN MARCOS, CA 92079-2012
PO BOX 2013, SAN MARCOS, CA 92079-2013
PO BOX 2014, SAN MARCOS, CA 92079-2014
PO BOX 2015, SAN MARCOS, CA 92079-2015
PO BOX 2016, SAN MARCOS, CA 92079-2016
PO BOX 2017, SAN MARCOS, CA 92079-2017
PO BOX 2018, SAN MARCOS, CA 92079-2018
PO BOX 2019, SAN MARCOS, CA 92079-2019
PO BOX 2020, SAN MARCOS, CA 92079-2020
PO BOX 2021, SAN MARCOS, CA 92079-2021
PO BOX 2022, SAN MARCOS, CA 92079-2022
PO BOX 2023, SAN MARCOS, CA 92079-2023
PO BOX 2024, SAN MARCOS, CA 92079-2024
PO BOX 2025, SAN MARCOS, CA 92079-2025
PO BOX 2026, SAN MARCOS, CA 92079-2026
PO BOX 2027, SAN MARCOS, CA 92079-2027
PO BOX 2028, SAN MARCOS, CA 92079-2028
PO BOX 2029, SAN MARCOS, CA 92079-2029
PO BOX 2030, SAN MARCOS, CA 92079-2030
PO BOX 2031, SAN MARCOS, CA 92079-2031
PO BOX 2032, SAN MARCOS, CA 92079-2032
PO BOX 2033, SAN MARCOS, CA 92079-2033
PO BOX 2034, SAN MARCOS, CA 92079-2034
PO BOX 2035, SAN MARCOS, CA 92079-2035
PO BOX 2036, SAN MARCOS, CA 92079-2036
PO BOX 2037, SAN MARCOS, CA 92079-2037
PO BOX 2038, SAN MARCOS, CA 92079-2038
PO BOX 2039, SAN MARCOS, CA 92079-2039
PO BOX 2040, SAN MARCOS, CA 92079-2040
PO BOX 2041, SAN MARCOS, CA 92079-2041
PO BOX 2042, SAN MARCOS, CA 92079-2042
PO BOX 2043, SAN MARCOS, CA 92079-2043
PO BOX 2044, SAN MARCOS, CA 92079-2044
PO BOX 2045, SAN MARCOS, CA 92079-2045
PO BOX 2046, SAN MARCOS, CA 92079-2046
PO BOX 2047, SAN MARCOS, CA 92079-2047
PO BOX 2048, SAN MARCOS, CA 92079-2048
PO BOX 2049, SAN MARCOS, CA 92079-2049
PO BOX 2050, SAN MARCOS, CA 92079-2050
PO BOX 2051, SAN MARCOS, CA 92079-2051
PO BOX 2052, SAN MARCOS, CA 92079-2052
PO BOX 2053, SAN MARCOS, CA 92079-2053
PO BOX 2054, SAN MARCOS, CA 92079-2054
PO BOX 2055, SAN MARCOS, CA 92079-2055
PO BOX 2056, SAN MARCOS, CA 92079-2056
PO BOX 2057, SAN MARCOS, CA 92079-2057
PO BOX 2058, SAN MARCOS, CA 92079-2058
PO BOX 2059, SAN MARCOS, CA 92079-2059
PO BOX 2060, SAN MARCOS, CA 92079-2060
PO BOX 2061, SAN MARCOS, CA 92079-2061
PO BOX 2062, SAN MARCOS, CA 92079-2062
PO BOX 2063, SAN MARCOS, CA 92079-2063
PO BOX 2064, SAN MARCOS, CA 92079-2064
PO BOX 2065, SAN MARCOS, CA 92079-2065
PO BOX 2066, SAN MARCOS, CA 92079-2066
PO BOX 2067, SAN MARCOS, CA 92079-2067
PO BOX 2068, SAN MARCOS, CA 92079-2068
PO BOX 2069, SAN MARCOS, CA 92079-2069
PO BOX 2070, SAN MARCOS, CA 92079-2070
PO BOX 2071, SAN MARCOS, CA 92079-2071
PO BOX 2072, SAN MARCOS, CA 92079-2072
PO BOX 2073, SAN MARCOS, CA 92079-2073
PO BOX 2074, SAN MARCOS, CA 92079-2074
PO BOX 2075, SAN MARCOS, CA 92079-2075
PO BOX 2076, SAN MARCOS, CA 92079-2076
PO BOX 2077, SAN MARCOS, CA 92079-2077
PO BOX 2078, SAN MARCOS, CA 92079-2078
PO BOX 2079, SAN MARCOS, CA 92079-2079
PO BOX 2080, SAN MARCOS, CA 92079-2080
PO BOX 2081, SAN MARCOS, CA 92079-2081
PO BOX 2082, SAN MARCOS, CA 92079-2082
PO BOX 2083, SAN MARCOS, CA 92079-2083
PO BOX 2084, SAN MARCOS, CA 92079-2084
PO BOX 2085, SAN MARCOS, CA 92079-2085
PO BOX 2086, SAN MARCOS, CA 92079-2086
PO BOX 2087, SAN MARCOS, CA 92079-2087
PO BOX 2088, SAN MARCOS, CA 92079-2088
PO BOX 2089, SAN MARCOS, CA 92079-2089
PO BOX 2090, SAN MARCOS, CA 92079-2090
PO BOX 2091, SAN MARCOS, CA 92079-2091
PO BOX 2092, SAN MARCOS, CA 92079-2092
PO BOX 2093, SAN MARCOS, CA 92079-2093
PO BOX 2094, SAN MARCOS, CA 92079-2094
PO BOX 2095, SAN MARCOS, CA 92079-2095
PO BOX 2096, SAN MARCOS, CA 92079-2096
PO BOX 2097, SAN MARCOS, CA 92079-2097
PO BOX 2098, SAN MARCOS, CA 92079-2098
PO BOX 2099, SAN MARCOS, CA 92079-2099
PO BOX 2100, SAN MARCOS, CA 92079-2100
PO BOX 2101, SAN MARCOS, CA 92079-2101
PO BOX 2102, SAN MARCOS, CA 92079-2102
PO BOX 2103, SAN MARCOS, CA 92079-2103
PO BOX 2104, SAN MARCOS, CA 92079-2104
PO BOX 2105, SAN MARCOS, CA 92079-2105
PO BOX 2106, SAN MARCOS, CA 92079-2106
PO BOX 2107, SAN MARCOS, CA 92079-2107
PO BOX 2108, SAN MARCOS, CA 92079-2108
PO BOX 2109, SAN MARCOS, CA 92079-2109
PO BOX 2110, SAN MARCOS, CA 92079-2110
PO BOX 2111, SAN MARCOS, CA 92079-2111
PO BOX 2112, SAN MARCOS, CA 92079-2112
PO BOX 2113, SAN MARCOS, CA 92079-2113
PO BOX 2114, SAN MARCOS, CA 92079-2114
PO BOX 2115, SAN MARCOS, CA 92079-2115
PO BOX 2116, SAN MARCOS, CA 92079-2116
PO BOX 2117, SAN MARCOS, CA 92079-2117
PO BOX 2118, SAN MARCOS, CA 92079-2118
PO BOX 2119, SAN MARCOS, CA 92079-2119
PO BOX 2120, SAN MARCOS, CA 92079-2120
PO BOX 2121, SAN MARCOS, CA 92079-2121
PO BOX 2122, SAN MARCOS, CA 92079-2122
PO BOX 2123, SAN MARCOS, CA 92079-2123
PO BOX 2124, SAN MARCOS, CA 92079-2124
PO BOX 2125, SAN MARCOS, CA 92079-2125
PO BOX 2126, SAN MARCOS, CA 92079-2126
PO BOX 2127, SAN MARCOS, CA 92079-2127
PO BOX 2128, SAN MARCOS, CA 92079-2128
PO BOX 2129, SAN MARCOS, CA 92079-2129
PO BOX 2130, SAN MARCOS, CA 92079-2130
PO BOX 2131, SAN MARCOS, CA 92079-2131
PO BOX 2132, SAN MARCOS, CA 92079-2132
PO BOX 2133, SAN MARCOS, CA 92079-2133
PO BOX 2134, SAN MARCOS, CA 92079-2134
PO BOX 2135, SAN MARCOS, CA 92079-2135
PO BOX 2136, SAN MARCOS, CA 92079-2136
PO BOX 2137, SAN MARCOS, CA 92079-2137
PO BOX 2138, SAN MARCOS, CA 92079-2138
PO BOX 2139, SAN MARCOS, CA 92079-2139
PO BOX 2140, SAN MARCOS, CA 92079-2140
PO BOX 2141, SAN MARCOS, CA 92079-2141
PO BOX 2142, SAN MARCOS, CA 92079-2142
PO BOX 2143, SAN MARCOS, CA 92079-2143
PO BOX 2144, SAN MARCOS, CA 92079-2144
PO BOX 2145, SAN MARCOS, CA 92079-2145
PO BOX 2146, SAN MARCOS, CA 92079-2146
PO BOX 2147, SAN MARCOS, CA 92079-2147
PO BOX 2148, SAN MARCOS, CA 92079-2148
PO BOX 2149, SAN MARCOS, CA 92079-2149
PO BOX 2150, SAN MARCOS, CA 92079-2150
PO BOX 2151, SAN MARCOS, CA 92079-2151
PO BOX 2152, SAN MARCOS, CA 92079-2152
PO BOX 2153, SAN MARCOS, CA 92079-2153
PO BOX 2154, SAN MARCOS, CA 92079-2154
PO BOX 2155, SAN MARCOS, CA 92079-2155
PO BOX 2156, SAN MARCOS, CA 92079-2156
PO BOX 2157, SAN MARCOS, CA 92079-2157
PO BOX 2158, SAN MARCOS, CA 92079-2158
PO BOX 2159, SAN MARCOS, CA 92079-2159
PO BOX 2160, SAN MARCOS, CA 92079-2160
PO BOX 2161, SAN MARCOS, CA 92079-2161
PO BOX 2162, SAN MARCOS, CA 92079-2162
PO BOX 2163, SAN MARCOS, CA 92079-2163
PO BOX 2164, SAN MARCOS, CA 92079-2164
PO BOX 2165, SAN MARCOS, CA 92079-2165
PO BOX 2166, SAN MARCOS, CA 92079-2166
PO BOX 2167, SAN MARCOS, CA 92079-2167
PO BOX 2168, SAN MARCOS, CA 92079-2168
PO BOX 2169, SAN MARCOS, CA 92079-2169
PO BOX 2170, SAN MARCOS, CA 92079-2170
PO BOX 2171, SAN MARCOS, CA 92079-2171
PO BOX 2172, SAN MARCOS, CA 92079-2172
PO BOX 2173, SAN MARCOS, CA 92079-2173
PO BOX 2174, SAN MARCOS, CA 92079-2174
PO BOX 2175, SAN MARCOS, CA 92079-2175
PO BOX 2176, SAN MARCOS, CA 92079-2176
PO BOX 2177, SAN MARCOS, CA 92079-2177
PO BOX 2178, SAN MARCOS, CA 92079-2178
PO BOX 2179, SAN MARCOS, CA 92079-2179
PO BOX 2180, SAN MARCOS, CA 92079-2180
PO BOX 2181, SAN MARCOS, CA 92079-2181
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