Formed in the year 1830, McLean County was named after John McLean, United States Senator. It has a total area of 1,186.27 sq mi. Bloomington is the county seat and the largest city of McLean. It is the largest county by land area with a total population of over 0.17 million with a racial makeup including White, Native American, black or African American, Asian, Hispanic or Latino, Pacific Islander, and others including more than 56.7K households and 35.4K families.

Previously, to obtain data of the past, one would need to roam around with almost zero results but nowadays the task has been made easier by the McLean County records index for people from all over the world to study their genealogical history on obituary notice, civil court case lookups, land and estate data, burial and cemetery details, war and enlistment data, origin and birth details, marriage volume number, divorce details, World War I and II information, last will or probate specifics, real estate and property facts, census data, American Civil War history, immigration and naturalization specifics, demise facts successfully!!!