Mason, IL has a population of 352 and is the 21,582nd largest city in the United States. The population density is 273 per sq mi which is 23% higher than the Illinois average and 202% higher than the national average. The median age in Mason is 37 which is approximately 1% lower than the Illinois average of 37. In Mason, 49% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 95% of Mason residents were born in Illinois, 5% were born out of state, 0% were born outside of the United States and 0% were foreign born.
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The population density in Mason is 23% higher than Illinois.
The median age in Mason is 1% lower than Illinois.
In Mason 99.15% of the population is White.
In Mason 0.00% of the population is Black or African American.