Landmark, AR has a population of 3,045 and is the 8,738th largest city in the United States. The population density is 330 per sq mi which is 496% higher than the Arkansas average and 265% higher than the national average. The median age in Landmark is 43 which is approximately 14% higher than the Arkansas average of 38. In Landmark, 55% of the population over 15 years of age are married, 94% speak English and 4% speak Spanish. 74% of Landmark residents were born in Arkansas, 23% were born out of state, 1% were born outside of the United States and 3% were foreign born.