Smithville is a town in McCurtain County, Oklahoma, United States. Its population was 77 at the 2020 census, down from 113 at the 2010 census. Smithville has the distinction of being the wettest spot in Oklahoma ranked by highest annual average precipitation, at 55.71 inches.

Smithville lies in McCurtain County, just east of U.S. Route 259 on Oklahoma Route 4. The town is just north of the Mountain Fork River and about 10 miles north of Broken Bow Lake. The town is among a handful of towns in the southeastern corner of Oklahoma, in an area known as Little Dixie.

According to the United States Census Bureau, the town has a total area of 1.1 square miles (2.8 km), all land.

Historical population

Census	Pop.	Note	%±
2020	77		—
U.S. Decennial Census

As of the census of 2010, 113 people, 53 households, and 28 families were residing in the town. The population density was 111 people per square mile (39/km). The 65 housing units had an average density of 60/sq mi (23/km). The racial makeup of the town was 58.4% White, 34.5% Native American, and 7.1% from two or more races. Hispanics or Latinos of any race were 2.7% of the population.

Of the 53 households, 32% included children under 18, 34% were married couples living together, 17% had a female householder with no husband present, and 47% were not families. Individuals living alone accounted for 47% of households and those individuals 65 or older living alone accounted for 21% of households. The average household size was 2.13, and the average family size was 3.07.

In the town, theage distribution was 31% under 18, 7% from 18 to 24, 22% from 25 to 44, 25% from 45 to 64, and 15% who were 65 or older. The median age was 32 years.

The median income for a household in the town was $21,136, and for a family was $16,083. The per capita income for the town was $15,674. There were 61.9% of families and 45.2% of the population living below the poverty line.

• Curtis McDaniel, politician

• List of towns in Oklahoma