Marshall is a city located in Clark County Illinois. Marshall has a 2020 population of 4,310. It is also the county seat of Clark County. Marshall is currently declining at a rate of -0.99% annually and its population has decreased by -5.67% since the most recent census, which recorded a population of 4,569 in 2010. Marshall reached it's highest population of 4,569 in 2010.
The average household income in Marshall is $75,508 with a poverty rate of 14.81%. The median rental costs in recent years comes to $676 per month, and the median house value is $117,400. The median age in Marshall is 37.2 years, 35.3 years for males, and 41.8 years for females.