Marksville, LA has a population of 5,560 and is the 6,037th largest city in the United States. The population density is 1,155 per sq mi which is 1202% higher than the Louisiana average and 1175% higher than the national average. The median age in Marksville is 34 which is approximately 7% lower than the Louisiana average of 36. In Marksville, 47% of the population over 15 years of age are married, 83% speak English and 1% speak Spanish. 91% of Marksville residents were born in Louisiana, 7% were born out of state, 0% were born outside of the United States and 2% were foreign born.