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 1841, SPRING VALLEY, CA 91979-1841
PO BOX 1842, SPRING VALLEY, CA 91979-1842
PO BOX 1843, SPRING VALLEY, CA 91979-1843
PO BOX 1844, SPRING VALLEY, CA 91979-1844
PO BOX 1845, SPRING VALLEY, CA 91979-1845
PO BOX 1846, SPRING VALLEY, CA 91979-1846
PO BOX 1847, SPRING VALLEY, CA 91979-1847
PO BOX 1848, SPRING VALLEY, CA 91979-1848
PO BOX 1849, SPRING VALLEY, CA 91979-1849
PO BOX 1850, SPRING VALLEY, CA 91979-1850
PO BOX 1851, SPRING VALLEY, CA 91979-1851
PO BOX 1852, SPRING VALLEY, CA 91979-1852
PO BOX 1853, SPRING VALLEY, CA 91979-1853
PO BOX 1854, SPRING VALLEY, CA 91979-1854
PO BOX 1855, SPRING VALLEY, CA 91979-1855
PO BOX 1856, SPRING VALLEY, CA 91979-1856
PO BOX 1857, SPRING VALLEY, CA 91979-1857
PO BOX 1858, SPRING VALLEY, CA 91979-1858
PO BOX 1859, SPRING VALLEY, CA 91979-1859
PO BOX 1860, SPRING VALLEY, CA 91979-1860
PO BOX 1861, SPRING VALLEY, CA 91979-1861
PO BOX 1862, SPRING VALLEY, CA 91979-1862
PO BOX 1863, SPRING VALLEY, CA 91979-1863
PO BOX 1864, SPRING VALLEY, CA 91979-1864
PO BOX 1865, SPRING VALLEY, CA 91979-1865
PO BOX 1866, SPRING VALLEY, CA 91979-1866
PO BOX 1867, SPRING VALLEY, CA 91979-1867
PO BOX 1868, SPRING VALLEY, CA 91979-1868
PO BOX 1869, SPRING VALLEY, CA 91979-1869
PO BOX 1870, SPRING VALLEY, CA 91979-1870
PO BOX 1871, SPRING VALLEY, CA 91979-1871
PO BOX 1872, SPRING VALLEY, CA 91979-1872
PO BOX 1873, SPRING VALLEY, CA 91979-1873
PO BOX 1874, SPRING VALLEY, CA 91979-1874
PO BOX 1875, SPRING VALLEY, CA 91979-1875
PO BOX 1876, SPRING VALLEY, CA 91979-1876
PO BOX 1877, SPRING VALLEY, CA 91979-1877
PO BOX 1878, SPRING VALLEY, CA 91979-1878
PO BOX 1879, SPRING VALLEY, CA 91979-1879
PO BOX 1880, SPRING VALLEY, CA 91979-1880
PO BOX 1881, SPRING VALLEY, CA 91979-1881
PO BOX 1882, SPRING VALLEY, CA 91979-1882
PO BOX 1883, SPRING VALLEY, CA 91979-1883
PO BOX 1884, SPRING VALLEY, CA 91979-1884
PO BOX 1885, SPRING VALLEY, CA 91979-1885
PO BOX 1886, SPRING VALLEY, CA 91979-1886
PO BOX 1887, SPRING VALLEY, CA 91979-1887
PO BOX 1888, SPRING VALLEY, CA 91979-1888
PO BOX 1889, SPRING VALLEY, CA 91979-1889
PO BOX 1890, SPRING VALLEY, CA 91979-1890
PO BOX 1891, SPRING VALLEY, CA 91979-1891
PO BOX 1892, SPRING VALLEY, CA 91979-1892
PO BOX 1893, SPRING VALLEY, CA 91979-1893
PO BOX 1894, SPRING VALLEY, CA 91979-1894
PO BOX 1895, SPRING VALLEY, CA 91979-1895
PO BOX 1896, SPRING VALLEY, CA 91979-1896
PO BOX 1897, SPRING VALLEY, CA 91979-1897
PO BOX 1898, SPRING VALLEY, CA 91979-1898
PO BOX 1899, SPRING VALLEY, CA 91979-1899
PO BOX 1900, SPRING VALLEY, CA 91979-1900
PO BOX 1901, SPRING VALLEY, CA 91979-1901
PO BOX 1902, SPRING VALLEY, CA 91979-1902
PO BOX 1903, SPRING VALLEY, CA 91979-1903
PO BOX 1904, SPRING VALLEY, CA 91979-1904
PO BOX 1905, SPRING VALLEY, CA 91979-1905
PO BOX 1906, SPRING VALLEY, CA 91979-1906
PO BOX 1907, SPRING VALLEY, CA 91979-1907
PO BOX 1908, SPRING VALLEY, CA 91979-1908
PO BOX 1909, SPRING VALLEY, CA 91979-1909
PO BOX 1910, SPRING VALLEY, CA 91979-1910
PO BOX 1911, SPRING VALLEY, CA 91979-1911
PO BOX 1912, SPRING VALLEY, CA 91979-1912
PO BOX 1913, SPRING VALLEY, CA 91979-1913
PO BOX 1914, SPRING VALLEY, CA 91979-1914
PO BOX 1915, SPRING VALLEY, CA 91979-1915
PO BOX 1916, SPRING VALLEY, CA 91979-1916
PO BOX 1917, SPRING VALLEY, CA 91979-1917
PO BOX 1918, SPRING VALLEY, CA 91979-1918
PO BOX 1919, SPRING VALLEY, CA 91979-1919
PO BOX 1920, SPRING VALLEY, CA 91979-1920
PO BOX 1921, SPRING VALLEY, CA 91979-1921
PO BOX 1922, SPRING VALLEY, CA 91979-1922
PO BOX 1923, SPRING VALLEY, CA 91979-1923
PO BOX 1924, SPRING VALLEY, CA 91979-1924
PO BOX 1925, SPRING VALLEY, CA 91979-1925
PO BOX 1926, SPRING VALLEY, CA 91979-1926
PO BOX 1927, SPRING VALLEY, CA 91979-1927
PO BOX 1928, SPRING VALLEY, CA 91979-1928
PO BOX 1929, SPRING VALLEY, CA 91979-1929
PO BOX 1930, SPRING VALLEY, CA 91979-1930
PO BOX 1931, SPRING VALLEY, CA 91979-1931
PO BOX 1932, SPRING VALLEY, CA 91979-1932
PO BOX 1933, SPRING VALLEY, CA 91979-1933
PO BOX 1934, SPRING VALLEY, CA 91979-1934
PO BOX 1935, SPRING VALLEY, CA 91979-1935
PO BOX 1936, SPRING VALLEY, CA 91979-1936
PO BOX 1937, SPRING VALLEY, CA 91979-1937
PO BOX 1938, SPRING VALLEY, CA 91979-1938
PO BOX 1939, SPRING VALLEY, CA 91979-1939
PO BOX 1940, SPRING VALLEY, CA 91979-1940
PO BOX 1941, SPRING VALLEY, CA 91979-1941
PO BOX 1942, SPRING VALLEY, CA 91979-1942
PO BOX 1943, SPRING VALLEY, CA 91979-1943
PO BOX 1944, SPRING VALLEY, CA 91979-1944
PO BOX 1945, SPRING VALLEY, CA 91979-1945
PO BOX 1946, SPRING VALLEY, CA 91979-1946
PO BOX 1947, SPRING VALLEY, CA 91979-1947
PO BOX 1948, SPRING VALLEY, CA 91979-1948
PO BOX 1949, SPRING VALLEY, CA 91979-1949
PO BOX 1950, SPRING VALLEY, CA 91979-1950
PO BOX 1951, SPRING VALLEY, CA 91979-1951
PO BOX 1952, SPRING VALLEY, CA 91979-1952
PO BOX 1953, SPRING VALLEY, CA 91979-1953
PO BOX 1954, SPRING VALLEY, CA 91979-1954
PO BOX 1955, SPRING VALLEY, CA 91979-1955
PO BOX 1956, SPRING VALLEY, CA 91979-1956
PO BOX 1957, SPRING VALLEY, CA 91979-1957
PO BOX 1958, SPRING VALLEY, CA 91979-1958
PO BOX 1959, SPRING VALLEY, CA 91979-1959
PO BOX 1960, SPRING VALLEY, CA 91979-1960
PO BOX 1961, SPRING VALLEY, CA 91979-1961
PO BOX 1962, SPRING VALLEY, CA 91979-1962
PO BOX 1963, SPRING VALLEY, CA 91979-1963
PO BOX 1964, SPRING VALLEY, CA 91979-1964
PO BOX 1965, SPRING VALLEY, CA 91979-1965
PO BOX 1966, SPRING VALLEY, CA 91979-1966
PO BOX 1967, SPRING VALLEY, CA 91979-1967
PO BOX 1968, SPRING VALLEY, CA 91979-1968
PO BOX 1969, SPRING VALLEY, CA 91979-1969
PO BOX 1970, SPRING VALLEY, CA 91979-1970
PO BOX 1971, SPRING VALLEY, CA 91979-1971
PO BOX 1972, SPRING VALLEY, CA 91979-1972
PO BOX 1973, SPRING VALLEY, CA 91979-1973
PO BOX 1974, SPRING VALLEY, CA 91979-1974
PO BOX 1975, SPRING VALLEY, CA 91979-1975
PO BOX 1976, SPRING VALLEY, CA 91979-1976
PO BOX 1977, SPRING VALLEY, CA 91979-1977
PO BOX 1978, SPRING VALLEY, CA 91979-1978
PO BOX 1979, SPRING VALLEY, CA 91979-1979
PO BOX 1980, SPRING VALLEY, CA 91979-1980
PO BOX 1981, SPRING VALLEY, CA 91979-1981
PO BOX 1982, SPRING VALLEY, CA 91979-1982
PO BOX 1983, SPRING VALLEY, CA 91979-1983
PO BOX 1984, SPRING VALLEY, CA 91979-1984
PO BOX 1985, SPRING VALLEY, CA 91979-1985
PO BOX 1986, SPRING VALLEY, CA 91979-1986
PO BOX 1987, SPRING VALLEY, CA 91979-1987
PO BOX 1988, SPRING VALLEY, CA 91979-1988
PO BOX 1989, SPRING VALLEY, CA 91979-1989
PO BOX 1990, SPRING VALLEY, CA 91979-1990
PO BOX 1991, SPRING VALLEY, CA 91979-1991
PO BOX 1992, SPRING VALLEY, CA 91979-1992
PO BOX 1993, SPRING VALLEY, CA 91979-1993
PO BOX 1994, SPRING VALLEY, CA 91979-1994
PO BOX 1995, SPRING VALLEY, CA 91979-1995
PO BOX 1996, SPRING VALLEY, CA 91979-1996
PO BOX 1997, SPRING VALLEY, CA 91979-1997
PO BOX 1998, SPRING VALLEY, CA 91979-1998
PO BOX 1999, SPRING VALLEY, CA 91979-1999
PO BOX 2000, SPRING VALLEY, CA 91979-2000
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