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 1851, HIGHLAND PARK, IL 60035-7851
PO BOX 1852, HIGHLAND PARK, IL 60035-7852
PO BOX 1853, HIGHLAND PARK, IL 60035-7853
PO BOX 1854, HIGHLAND PARK, IL 60035-7854
PO BOX 1855, HIGHLAND PARK, IL 60035-7855
PO BOX 1856, HIGHLAND PARK, IL 60035-7856
PO BOX 1857, HIGHLAND PARK, IL 60035-7857
PO BOX 1858, HIGHLAND PARK, IL 60035-7858
PO BOX 1859, HIGHLAND PARK, IL 60035-7859
PO BOX 1860, HIGHLAND PARK, IL 60035-7860
PO BOX 1861, HIGHLAND PARK, IL 60035-7861
PO BOX 1862, HIGHLAND PARK, IL 60035-7862
PO BOX 1863, HIGHLAND PARK, IL 60035-7863
PO BOX 1864, HIGHLAND PARK, IL 60035-7864
PO BOX 1865, HIGHLAND PARK, IL 60035-7865
PO BOX 1866, HIGHLAND PARK, IL 60035-7866
PO BOX 1867, HIGHLAND PARK, IL 60035-7867
PO BOX 1868, HIGHLAND PARK, IL 60035-7868
PO BOX 1869, HIGHLAND PARK, IL 60035-7869
PO BOX 1870, HIGHLAND PARK, IL 60035-7870
PO BOX 1871, HIGHLAND PARK, IL 60035-7871
PO BOX 1872, HIGHLAND PARK, IL 60035-7872
PO BOX 1873, HIGHLAND PARK, IL 60035-7873
PO BOX 1874, HIGHLAND PARK, IL 60035-7874
PO BOX 1875, HIGHLAND PARK, IL 60035-7875
PO BOX 1876, HIGHLAND PARK, IL 60035-7876
PO BOX 1877, HIGHLAND PARK, IL 60035-7877
PO BOX 1878, HIGHLAND PARK, IL 60035-7878
PO BOX 1879, HIGHLAND PARK, IL 60035-7879
PO BOX 1880, HIGHLAND PARK, IL 60035-7880
PO BOX 1881, HIGHLAND PARK, IL 60035-7881
PO BOX 1882, HIGHLAND PARK, IL 60035-7882
PO BOX 1883, HIGHLAND PARK, IL 60035-7883
PO BOX 1884, HIGHLAND PARK, IL 60035-7884
PO BOX 1885, HIGHLAND PARK, IL 60035-7885
PO BOX 1886, HIGHLAND PARK, IL 60035-7886
PO BOX 1887, HIGHLAND PARK, IL 60035-7887
PO BOX 1888, HIGHLAND PARK, IL 60035-7888
PO BOX 1889, HIGHLAND PARK, IL 60035-7889
PO BOX 1890, HIGHLAND PARK, IL 60035-7890
PO BOX 1891, HIGHLAND PARK, IL 60035-7891
PO BOX 1892, HIGHLAND PARK, IL 60035-7892
PO BOX 1893, HIGHLAND PARK, IL 60035-7893
PO BOX 1894, HIGHLAND PARK, IL 60035-7894
PO BOX 1895, HIGHLAND PARK, IL 60035-7895
PO BOX 1896, HIGHLAND PARK, IL 60035-7896
PO BOX 1897, HIGHLAND PARK, IL 60035-7897
PO BOX 1898, HIGHLAND PARK, IL 60035-7898
PO BOX 1899, HIGHLAND PARK, IL 60035-7899
PO BOX 1900, HIGHLAND PARK, IL 60035-7900
PO BOX 1901, HIGHLAND PARK, IL 60035-7901
PO BOX 1902, HIGHLAND PARK, IL 60035-7902
PO BOX 1903, HIGHLAND PARK, IL 60035-7903
PO BOX 1904, HIGHLAND PARK, IL 60035-7904
PO BOX 1905, HIGHLAND PARK, IL 60035-7905
PO BOX 1906, HIGHLAND PARK, IL 60035-7906
PO BOX 1907, HIGHLAND PARK, IL 60035-7907
PO BOX 1908, HIGHLAND PARK, IL 60035-7908
PO BOX 1909, HIGHLAND PARK, IL 60035-7909
PO BOX 1910, HIGHLAND PARK, IL 60035-7910
PO BOX 1911, HIGHLAND PARK, IL 60035-7911
PO BOX 1912, HIGHLAND PARK, IL 60035-7912
PO BOX 1913, HIGHLAND PARK, IL 60035-7913
PO BOX 1914, HIGHLAND PARK, IL 60035-7914
PO BOX 1915, HIGHLAND PARK, IL 60035-7915
PO BOX 1916, HIGHLAND PARK, IL 60035-7916
PO BOX 1917, HIGHLAND PARK, IL 60035-7917
PO BOX 1918, HIGHLAND PARK, IL 60035-7918
PO BOX 1919, HIGHLAND PARK, IL 60035-7919
PO BOX 1920, HIGHLAND PARK, IL 60035-7920
PO BOX 1921, HIGHLAND PARK, IL 60035-7921
PO BOX 1922, HIGHLAND PARK, IL 60035-7922
PO BOX 1923, HIGHLAND PARK, IL 60035-7923
PO BOX 1924, HIGHLAND PARK, IL 60035-7924
PO BOX 1925, HIGHLAND PARK, IL 60035-7925
PO BOX 1926, HIGHLAND PARK, IL 60035-7926
PO BOX 1927, HIGHLAND PARK, IL 60035-7927
PO BOX 1928, HIGHLAND PARK, IL 60035-7928
PO BOX 1929, HIGHLAND PARK, IL 60035-7929
PO BOX 1930, HIGHLAND PARK, IL 60035-7930
PO BOX 1931, HIGHLAND PARK, IL 60035-7931
PO BOX 1932, HIGHLAND PARK, IL 60035-7932
PO BOX 1933, HIGHLAND PARK, IL 60035-7933
PO BOX 1934, HIGHLAND PARK, IL 60035-7934
PO BOX 1935, HIGHLAND PARK, IL 60035-7935
PO BOX 1936, HIGHLAND PARK, IL 60035-7936
PO BOX 1937, HIGHLAND PARK, IL 60035-7937
PO BOX 1938, HIGHLAND PARK, IL 60035-7938
PO BOX 1939, HIGHLAND PARK, IL 60035-7939
PO BOX 1940, HIGHLAND PARK, IL 60035-7940
PO BOX 1941, HIGHLAND PARK, IL 60035-7941
PO BOX 1942, HIGHLAND PARK, IL 60035-7942
PO BOX 1943, HIGHLAND PARK, IL 60035-7943
PO BOX 1944, HIGHLAND PARK, IL 60035-7944
PO BOX 1945, HIGHLAND PARK, IL 60035-7945
PO BOX 1946, HIGHLAND PARK, IL 60035-7946
PO BOX 1947, HIGHLAND PARK, IL 60035-7947
PO BOX 1948, HIGHLAND PARK, IL 60035-7948
PO BOX 1949, HIGHLAND PARK, IL 60035-7949
PO BOX 1950, HIGHLAND PARK, IL 60035-7950
PO BOX 1951, HIGHLAND PARK, IL 60035-7951
PO BOX 1952, HIGHLAND PARK, IL 60035-7952
PO BOX 1953, HIGHLAND PARK, IL 60035-7953
PO BOX 1954, HIGHLAND PARK, IL 60035-7954
PO BOX 1955, HIGHLAND PARK, IL 60035-7955
PO BOX 1956, HIGHLAND PARK, IL 60035-7956
PO BOX 1957, HIGHLAND PARK, IL 60035-7957
PO BOX 1958, HIGHLAND PARK, IL 60035-7958
PO BOX 1959, HIGHLAND PARK, IL 60035-7959
PO BOX 1960, HIGHLAND PARK, IL 60035-7960
PO BOX 1961, HIGHLAND PARK, IL 60035-7961
PO BOX 1962, HIGHLAND PARK, IL 60035-7962
PO BOX 1963, HIGHLAND PARK, IL 60035-7963
PO BOX 1964, HIGHLAND PARK, IL 60035-7964
PO BOX 1965, HIGHLAND PARK, IL 60035-7965
PO BOX 1966, HIGHLAND PARK, IL 60035-7966
PO BOX 1967, HIGHLAND PARK, IL 60035-7967
PO BOX 1968, HIGHLAND PARK, IL 60035-7968
PO BOX 1969, HIGHLAND PARK, IL 60035-7969
PO BOX 1970, HIGHLAND PARK, IL 60035-7970
PO BOX 1971, HIGHLAND PARK, IL 60035-7971
PO BOX 1972, HIGHLAND PARK, IL 60035-7972
PO BOX 1973, HIGHLAND PARK, IL 60035-7973
PO BOX 1974, HIGHLAND PARK, IL 60035-7974
PO BOX 1975, HIGHLAND PARK, IL 60035-7975
PO BOX 1976, HIGHLAND PARK, IL 60035-7976
PO BOX 1977, HIGHLAND PARK, IL 60035-7977
PO BOX 1978, HIGHLAND PARK, IL 60035-7978
PO BOX 1979, HIGHLAND PARK, IL 60035-7979
PO BOX 1980, HIGHLAND PARK, IL 60035-7980
PO BOX 1981, HIGHLAND PARK, IL 60035-7981
PO BOX 1982, HIGHLAND PARK, IL 60035-7982
PO BOX 1983, HIGHLAND PARK, IL 60035-7983
PO BOX 1984, HIGHLAND PARK, IL 60035-7984
PO BOX 1985, HIGHLAND PARK, IL 60035-7985
PO BOX 1986, HIGHLAND PARK, IL 60035-7986
PO BOX 1987, HIGHLAND PARK, IL 60035-7987
PO BOX 1988, HIGHLAND PARK, IL 60035-7988
PO BOX 1989, HIGHLAND PARK, IL 60035-7989
PO BOX 1990, HIGHLAND PARK, IL 60035-7990
PO BOX 1991, HIGHLAND PARK, IL 60035-7991
PO BOX 1992, HIGHLAND PARK, IL 60035-7992
PO BOX 1993, HIGHLAND PARK, IL 60035-7993
PO BOX 1994, HIGHLAND PARK, IL 60035-7994
PO BOX 1995, HIGHLAND PARK, IL 60035-7995
PO BOX 1996, HIGHLAND PARK, IL 60035-7996
PO BOX 1997, HIGHLAND PARK, IL 60035-7997
PO BOX 1998, HIGHLAND PARK, IL 60035-7998
PO BOX 1999, HIGHLAND PARK, IL 60035-7999
PO BOX 2000, HIGHLAND PARK, IL 60035-8000
PO BOX 2001, HIGHLAND PARK, IL 60035-8001
PO BOX 2002, HIGHLAND PARK, IL 60035-8002
PO BOX 2003, HIGHLAND PARK, IL 60035-8003
PO BOX 2004, HIGHLAND PARK, IL 60035-8004
PO BOX 2005, HIGHLAND PARK, IL 60035-8005
PO BOX 2006, HIGHLAND PARK, IL 60035-8006
PO BOX 2007, HIGHLAND PARK, IL 60035-8007
PO BOX 2008, HIGHLAND PARK, IL 60035-8008
PO BOX 2009, HIGHLAND PARK, IL 60035-8009
PO BOX 2010, HIGHLAND PARK, IL 60035-8010
PO BOX 2011, HIGHLAND PARK, IL 60035-8011
PO BOX 2012, HIGHLAND PARK, IL 60035-8012
PO BOX 2013, HIGHLAND PARK, IL 60035-8013
PO BOX 2014, HIGHLAND PARK, IL 60035-8014
PO BOX 2015, HIGHLAND PARK, IL 60035-8015
PO BOX 2016, HIGHLAND PARK, IL 60035-8016
PO BOX 2017, HIGHLAND PARK, IL 60035-8017
PO BOX 2018, HIGHLAND PARK, IL 60035-8018
PO BOX 2019, HIGHLAND PARK, IL 60035-8019
PO BOX 2020, HIGHLAND PARK, IL 60035-8020
PO BOX 2021, HIGHLAND PARK, IL 60035-8021
PO BOX 2022, HIGHLAND PARK, IL 60035-8022
PO BOX 2023, HIGHLAND PARK, IL 60035-8023
PO BOX 2024, HIGHLAND PARK, IL 60035-8024
PO BOX 2025, HIGHLAND PARK, IL 60035-8025
PO BOX 2026, HIGHLAND PARK, IL 60035-8026
PO BOX 2027, HIGHLAND PARK, IL 60035-8027
PO BOX 2028, HIGHLAND PARK, IL 60035-8028
PO BOX 2029, HIGHLAND PARK, IL 60035-8029
PO BOX 2030, HIGHLAND PARK, IL 60035-8030
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