From a total population of 9,342, Columbia has a median age of 41.2. The average age of males, in Columbia, is 36.3 while the average age of females is 43.4. When you compare this to median age of Illinois, Columbia is 4.2 years older.
The median income of individuals, in Columbia, is $35,855 while the average household income is $65,286. When comparing the median income of people living in Columbia to the rest of Illinois, the average income in Columbia is $5,836 more.