In 2022, the population of Lillie was 107, a 1.83% decrease year-by-year from 2021. Previously, in 2021, Lillie's population was 109, a decline of 0.91% compared to a population of 110 in 2020.
The median age in Lillie, LA is 42.5, as per 2021 ACS 5-Year Estimates. Of the total population, 19.55% were under the age of 15, 24.81% aged 15 to 29, 34.59% aged 30 to 64, 18.80% aged 65 to 84, and 2.26% were 85 years of age and older.