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 1941, IMPERIAL BEACH, CA 91933-1941
PO BOX 1942, IMPERIAL BEACH, CA 91933-1942
PO BOX 1943, IMPERIAL BEACH, CA 91933-1943
PO BOX 1944, IMPERIAL BEACH, CA 91933-1944
PO BOX 1945, IMPERIAL BEACH, CA 91933-1945
PO BOX 1946, IMPERIAL BEACH, CA 91933-1946
PO BOX 1947, IMPERIAL BEACH, CA 91933-1947
PO BOX 1948, IMPERIAL BEACH, CA 91933-1948
PO BOX 1949, IMPERIAL BEACH, CA 91933-1949
PO BOX 1950, IMPERIAL BEACH, CA 91933-1950
PO BOX 1951, IMPERIAL BEACH, CA 91933-1951
PO BOX 1952, IMPERIAL BEACH, CA 91933-1952
PO BOX 1953, IMPERIAL BEACH, CA 91933-1953
PO BOX 1954, IMPERIAL BEACH, CA 91933-1954
PO BOX 1955, IMPERIAL BEACH, CA 91933-1955
PO BOX 1956, IMPERIAL BEACH, CA 91933-1956
PO BOX 1957, IMPERIAL BEACH, CA 91933-1957
PO BOX 1958, IMPERIAL BEACH, CA 91933-1958
PO BOX 1959, IMPERIAL BEACH, CA 91933-1959
PO BOX 1960, IMPERIAL BEACH, CA 91933-1960
PO BOX 1961, IMPERIAL BEACH, CA 91933-1961
PO BOX 1962, IMPERIAL BEACH, CA 91933-1962
PO BOX 1963, IMPERIAL BEACH, CA 91933-1963
PO BOX 1964, IMPERIAL BEACH, CA 91933-1964
PO BOX 1965, IMPERIAL BEACH, CA 91933-1965
PO BOX 1966, IMPERIAL BEACH, CA 91933-1966
PO BOX 1967, IMPERIAL BEACH, CA 91933-1967
PO BOX 1968, IMPERIAL BEACH, CA 91933-1968
PO BOX 1969, IMPERIAL BEACH, CA 91933-1969
PO BOX 1970, IMPERIAL BEACH, CA 91933-1970
PO BOX 1971, IMPERIAL BEACH, CA 91933-1971
PO BOX 1972, IMPERIAL BEACH, CA 91933-1972
PO BOX 1973, IMPERIAL BEACH, CA 91933-1973
PO BOX 1974, IMPERIAL BEACH, CA 91933-1974
PO BOX 1975, IMPERIAL BEACH, CA 91933-1975
PO BOX 1976, IMPERIAL BEACH, CA 91933-1976
PO BOX 1977, IMPERIAL BEACH, CA 91933-1977
PO BOX 1978, IMPERIAL BEACH, CA 91933-1978
PO BOX 1979, IMPERIAL BEACH, CA 91933-1979
PO BOX 1980, IMPERIAL BEACH, CA 91933-1980
PO BOX 1981, IMPERIAL BEACH, CA 91933-1981
PO BOX 1982, IMPERIAL BEACH, CA 91933-1982
PO BOX 1983, IMPERIAL BEACH, CA 91933-1983
PO BOX 1984, IMPERIAL BEACH, CA 91933-1984
PO BOX 1985, IMPERIAL BEACH, CA 91933-1985
PO BOX 1986, IMPERIAL BEACH, CA 91933-1986
PO BOX 1987, IMPERIAL BEACH, CA 91933-1987
PO BOX 1988, IMPERIAL BEACH, CA 91933-1988
PO BOX 1989, IMPERIAL BEACH, CA 91933-1989
PO BOX 1990, IMPERIAL BEACH, CA 91933-1990
PO BOX 1991, IMPERIAL BEACH, CA 91933-1991
PO BOX 1992, IMPERIAL BEACH, CA 91933-1992
PO BOX 1993, IMPERIAL BEACH, CA 91933-1993
PO BOX 1994, IMPERIAL BEACH, CA 91933-1994
PO BOX 1995, IMPERIAL BEACH, CA 91933-1995
PO BOX 1996, IMPERIAL BEACH, CA 91933-1996
PO BOX 1997, IMPERIAL BEACH, CA 91933-1997
PO BOX 1998, IMPERIAL BEACH, CA 91933-1998
PO BOX 1999, IMPERIAL BEACH, CA 91933-1999
PO BOX 2000, IMPERIAL BEACH, CA 91933-2000
PO BOX 2001, IMPERIAL BEACH, CA 91933-2001
PO BOX 2002, IMPERIAL BEACH, CA 91933-2002
PO BOX 2003, IMPERIAL BEACH, CA 91933-2003
PO BOX 2004, IMPERIAL BEACH, CA 91933-2004
PO BOX 2005, IMPERIAL BEACH, CA 91933-2005
PO BOX 2006, IMPERIAL BEACH, CA 91933-2006
PO BOX 2007, IMPERIAL BEACH, CA 91933-2007
PO BOX 2008, IMPERIAL BEACH, CA 91933-2008
PO BOX 2009, IMPERIAL BEACH, CA 91933-2009
PO BOX 2010, IMPERIAL BEACH, CA 91933-2010
PO BOX 2011, IMPERIAL BEACH, CA 91933-2011
PO BOX 2012, IMPERIAL BEACH, CA 91933-2012
PO BOX 2013, IMPERIAL BEACH, CA 91933-2013
PO BOX 2014, IMPERIAL BEACH, CA 91933-2014
PO BOX 2015, IMPERIAL BEACH, CA 91933-2015
PO BOX 2016, IMPERIAL BEACH, CA 91933-2016
PO BOX 2017, IMPERIAL BEACH, CA 91933-2017
PO BOX 2018, IMPERIAL BEACH, CA 91933-2018
PO BOX 2019, IMPERIAL BEACH, CA 91933-2019
PO BOX 2020, IMPERIAL BEACH, CA 91933-2020
PO BOX 2021, IMPERIAL BEACH, CA 91933-2021
PO BOX 2022, IMPERIAL BEACH, CA 91933-2022
PO BOX 2023, IMPERIAL BEACH, CA 91933-2023
PO BOX 2024, IMPERIAL BEACH, CA 91933-2024
PO BOX 2025, IMPERIAL BEACH, CA 91933-2025
PO BOX 2026, IMPERIAL BEACH, CA 91933-2026
PO BOX 2027, IMPERIAL BEACH, CA 91933-2027
PO BOX 2028, IMPERIAL BEACH, CA 91933-2028
PO BOX 2029, IMPERIAL BEACH, CA 91933-2029
PO BOX 2030, IMPERIAL BEACH, CA 91933-2030
PO BOX 2031, IMPERIAL BEACH, CA 91933-2031
PO BOX 2032, IMPERIAL BEACH, CA 91933-2032
PO BOX 2033, IMPERIAL BEACH, CA 91933-2033
PO BOX 2034, IMPERIAL BEACH, CA 91933-2034
PO BOX 2035, IMPERIAL BEACH, CA 91933-2035
PO BOX 2036, IMPERIAL BEACH, CA 91933-2036
PO BOX 2037, IMPERIAL BEACH, CA 91933-2037
PO BOX 2038, IMPERIAL BEACH, CA 91933-2038
PO BOX 2039, IMPERIAL BEACH, CA 91933-2039
PO BOX 2040, IMPERIAL BEACH, CA 91933-2040
PO BOX 2041, IMPERIAL BEACH, CA 91933-2041
PO BOX 2042, IMPERIAL BEACH, CA 91933-2042
PO BOX 2043, IMPERIAL BEACH, CA 91933-2043
PO BOX 2044, IMPERIAL BEACH, CA 91933-2044
PO BOX 2045, IMPERIAL BEACH, CA 91933-2045
PO BOX 2046, IMPERIAL BEACH, CA 91933-2046
PO BOX 2047, IMPERIAL BEACH, CA 91933-2047
PO BOX 2048, IMPERIAL BEACH, CA 91933-2048
PO BOX 2049, IMPERIAL BEACH, CA 91933-2049
PO BOX 2050, IMPERIAL BEACH, CA 91933-2050
PO BOX 2051, IMPERIAL BEACH, CA 91933-2051
PO BOX 2052, IMPERIAL BEACH, CA 91933-2052
PO BOX 2053, IMPERIAL BEACH, CA 91933-2053
PO BOX 2054, IMPERIAL BEACH, CA 91933-2054
PO BOX 2055, IMPERIAL BEACH, CA 91933-2055
PO BOX 2056, IMPERIAL BEACH, CA 91933-2056
PO BOX 2057, IMPERIAL BEACH, CA 91933-2057
PO BOX 2058, IMPERIAL BEACH, CA 91933-2058
PO BOX 2059, IMPERIAL BEACH, CA 91933-2059
PO BOX 2060, IMPERIAL BEACH, CA 91933-2060
PO BOX 2061, IMPERIAL BEACH, CA 91933-2061
PO BOX 2062, IMPERIAL BEACH, CA 91933-2062
PO BOX 2063, IMPERIAL BEACH, CA 91933-2063
PO BOX 2064, IMPERIAL BEACH, CA 91933-2064
PO BOX 2065, IMPERIAL BEACH, CA 91933-2065
PO BOX 2066, IMPERIAL BEACH, CA 91933-2066
PO BOX 2067, IMPERIAL BEACH, CA 91933-2067
PO BOX 2068, IMPERIAL BEACH, CA 91933-2068
PO BOX 2069, IMPERIAL BEACH, CA 91933-2069
PO BOX 2070, IMPERIAL BEACH, CA 91933-2070
PO BOX 2071, IMPERIAL BEACH, CA 91933-2071
PO BOX 2072, IMPERIAL BEACH, CA 91933-2072
PO BOX 2073, IMPERIAL BEACH, CA 91933-2073
PO BOX 2074, IMPERIAL BEACH, CA 91933-2074
PO BOX 2075, IMPERIAL BEACH, CA 91933-2075
PO BOX 2076, IMPERIAL BEACH, CA 91933-2076
PO BOX 2077, IMPERIAL BEACH, CA 91933-2077
PO BOX 2078, IMPERIAL BEACH, CA 91933-2078
PO BOX 2079, IMPERIAL BEACH, CA 91933-2079
PO BOX 2080, IMPERIAL BEACH, CA 91933-2080
PO BOX 2081, IMPERIAL BEACH, CA 91933-2081
PO BOX 2082, IMPERIAL BEACH, CA 91933-2082
PO BOX 2083, IMPERIAL BEACH, CA 91933-2083
PO BOX 2084, IMPERIAL BEACH, CA 91933-2084
PO BOX 2085, IMPERIAL BEACH, CA 91933-2085
PO BOX 2086, IMPERIAL BEACH, CA 91933-2086
PO BOX 2087, IMPERIAL BEACH, CA 91933-2087
PO BOX 2088, IMPERIAL BEACH, CA 91933-2088
PO BOX 2089, IMPERIAL BEACH, CA 91933-2089
PO BOX 2090, IMPERIAL BEACH, CA 91933-2090
PO BOX 2091, IMPERIAL BEACH, CA 91933-2091
PO BOX 2092, IMPERIAL BEACH, CA 91933-2092
PO BOX 2093, IMPERIAL BEACH, CA 91933-2093
PO BOX 2094, IMPERIAL BEACH, CA 91933-2094
PO BOX 2095, IMPERIAL BEACH, CA 91933-2095
PO BOX 2096, IMPERIAL BEACH, CA 91933-2096
PO BOX 2097, IMPERIAL BEACH, CA 91933-2097
PO BOX 2098, IMPERIAL BEACH, CA 91933-2098
PO BOX 2099, IMPERIAL BEACH, CA 91933-2099
PO BOX 2100, IMPERIAL BEACH, CA 91933-2100
PO BOX 2101, IMPERIAL BEACH, CA 91933-2101
PO BOX 2102, IMPERIAL BEACH, CA 91933-2102
PO BOX 2103, IMPERIAL BEACH, CA 91933-2103
PO BOX 2104, IMPERIAL BEACH, CA 91933-2104
PO BOX 2105, IMPERIAL BEACH, CA 91933-2105
PO BOX 2106, IMPERIAL BEACH, CA 91933-2106
PO BOX 2107, IMPERIAL BEACH, CA 91933-2107
PO BOX 2108, IMPERIAL BEACH, CA 91933-2108
PO BOX 2109, IMPERIAL BEACH, CA 91933-2109
PO BOX 2110, IMPERIAL BEACH, CA 91933-2110
PO BOX 2111, IMPERIAL BEACH, CA 91933-2111
PO BOX 2112, IMPERIAL BEACH, CA 91933-2112
PO BOX 2113, IMPERIAL BEACH, CA 91933-2113
PO BOX 2114, IMPERIAL BEACH, CA 91933-2114
PO BOX 2115, IMPERIAL BEACH, CA 91933-2115
PO BOX 2116, IMPERIAL BEACH, CA 91933-2116
PO BOX 2117, IMPERIAL BEACH, CA 91933-2117
PO BOX 2118, IMPERIAL BEACH, CA 91933-2118
PO BOX 2119, IMPERIAL BEACH, CA 91933-2119
PO BOX 2120, IMPERIAL BEACH, CA 91933-2120
PO BOX 2121, IMPERIAL BEACH, CA 91933-2121
PO BOX 2122, IMPERIAL BEACH, CA 91933-2122
PO BOX 2123, IMPERIAL BEACH, CA 91933-2123
PO BOX 2124, IMPERIAL BEACH, CA 91933-2124
PO BOX 2125, IMPERIAL BEACH, CA 91933-2125
PO BOX 2126, IMPERIAL BEACH, CA 91933-2126
PO BOX 2127, IMPERIAL BEACH, CA 91933-2127
PO BOX 2128, IMPERIAL BEACH, CA 91933-2128
PO BOX 2129, IMPERIAL BEACH, CA 91933-2129
PO BOX 2130, IMPERIAL BEACH, CA 91933-2130
PO BOX 2131, IMPERIAL BEACH, CA 91933-2131
PO BOX 2132, IMPERIAL BEACH, CA 91933-2132
PO BOX 2133, IMPERIAL BEACH, CA 91933-2133
PO BOX 2134, IMPERIAL BEACH, CA 91933-2134
PO BOX 2135, IMPERIAL BEACH, CA 91933-2135
PO BOX 2136, IMPERIAL BEACH, CA 91933-2136
PO BOX 2137, IMPERIAL BEACH, CA 91933-2137
PO BOX 2138, IMPERIAL BEACH, CA 91933-2138
PO BOX 2139, IMPERIAL BEACH, CA 91933-2139
PO BOX 2140, IMPERIAL BEACH, CA 91933-2140
PO BOX 2141, IMPERIAL BEACH, CA 91933-2141
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