La Fayette, IL has a population of 220 and is the 24,016th largest city in the United States. The population density is 1,165 per sq mi which is 424% higher than the Illinois average and 1186% higher than the national average. The median age in La Fayette is 45 which is approximately 19% higher than the Illinois average of 37. In La Fayette, 57% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 92% of La Fayette residents were born in Illinois, 8% were born out of state, 0% were born outside of the United States and 0% were foreign born.