Smithville, AR has a population of 97 and is the 27,024th largest city in the United States. The population density is 146 per sq mi which is 163% higher than the Arkansas average and 61% higher than the national average. The median age in Smithville is 41 which is approximately 9% higher than the Arkansas average of 38. In Smithville, 68% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 73% of Smithville residents were born in Arkansas, 25% were born out of state, 0% were born outside of the United States and 2% were foreign born.