Foyil is a town in Rogers County, Oklahoma, United States. It was named for Alfred Foyil, a local landowner and the first postmaster of the town. The population was 344 at the 2010 census, a 47.0 percent increase over the figure of 234 recorded in 2000.

Foyil is 10 miles (16 km) northeast of Claremore and 9 miles (14 km) southwest of Chelsea. It lies on Oklahoma State Highway 66, formerly U.S. Route 66, just south of its junction with Oklahoma State Highway 28.

According to the United States Census Bureau, the town has a total area of 0.4 square miles (1.0 km), all land.

Historical population

Census	Pop.	Note	%±
1920	109		—
1930	184		68.8%
1940	170		−7.6%
1950	146		−14.1%
1960	127		−13.0%
1970	164		29.1%
1980	191		16.5%
1990	86		−55.0%
2000	234		172.1%
2010	344		47.0%
2020	368		7.0%
U.S. Decennial Census

As of the census of 2000, there were 234 people, 97 households, and 68 families residing in the town. The population density was 657.2 inhabitants per square mile (253.7/km). There were 112 housing units at an average density of 314.6 per square mile (121.5/km). The racial makeup of the town was 79.06% White, 9.40% Native American, 1.71% from other races, and 9.83% from two or more races. Hispanic or Latino of any race were 2.56% of the population.

There were 97 households, out of which 23.7% had children under the age of 18 living with them, 57.7% were married couples living together, 11.3% had a female householder with no husband present, and 28.9% were non-families. 23.7% of all households were made up of individuals, and 12.4% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 2.83.

In the town, the population was spread out, with 21.8% under the age of 18, 6.8% from 18 to 24, 22.6% from 25 to 44, 33.3% from 45 to 64, and 15.4% who were 65 years of age or older. The median age was 44 years. For every 100 females, there were 95.0 males. For every 100 females age 18 and over, there were 88.7 males.

The median income for a household in the town was $23,125, and the median income for a family was $28,500. Males had a median income of $27,083 versus $24,107 for females. The per capita income for the town was $11,260. About 31.9% of families and 33.7% of the population were below the poverty line, including 37.7% of those under the age of eighteen and 15.6% of those 65 or over.

• Encyclopedia of Oklahoma History and Culture - Foyil