Illinois Illinois State Facts

Illinois Map

There are fewer men than woman in Illinois. The overall gender ratio is 96 men to 100 women.

The Illinois flag was adopted on June 27, 1969. The flag has been ranked the 34th best U.S. flag by a leading Vexillology Organization.

The Illinois quarter was the 21st quarter released overall. The quarter was released on January 2, 2003.

Recent estimates put Illinois's population at around 12,881,000 people (5th out of 56).The population density is 232.0 people per square mile (18th out of 56).

Someone from Illinois is known as a Illinoisan. View our List of Adjectival and Demonyms for all the States.

Illinois was the 21st state when it joined the United States on December 3, 1818. Prior to 1818, Illinois was known as "Illinois Territory."

Essential Illinois Facts

  • IL
    Postal Code
    The Illinois postal code is IL. This abbreviation has been used since the USPS first established official codes in October 1963.
  • Gender Ratio
    Gender Ratio: 96 Men to 100 Women
    Male Population: 6,320,886 men
    Female Population: 6,559,694 women
  • State Flag
    The 7 main colors in the Illinois flag are #FFFFFF, #785A3C, #BE0A2F, #FFE60F, #B4B4B4, #000000, and #002768
  • State Quarter
    The Illinois Quarter was released in January 01, 2003.
    Total Mintage: 0.46 billion.
    Engraver: Donna Weaver
  • Population and Area
    Population: 12,880,580 people
    Land Area: 55,519 square miles
    Population Density: 12,880,580 people per square mile

Areas Codes in Illinois (0)

    Illinois Counties (0)

    County Top Cities
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