Mayking is an unincorporated community and census-designated place in Letcher County, Kentucky, United States. Its population was 475 as of the 2020 census. Mayking has a post office with ZIP code 41837, which opened on January 25, 1894. U.S. Route 119 passes through the community.

According to the U.S. Census Bureau, the community has an area of 1.563 square miles (4.05 km); 1.540 square miles (3.99 km) of its area is land, and 0.023 square miles (0.060 km) is water.

As of the 2020 census, there were 475 people, 233 housing units, and 220 families in the CDP. The racial makeup was 96.8% White, 0.6% African American, 0.4% Native American, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 0.4% of the population.

The ancestry of the CDP was 36.7% American, 9.2% Scotch-Irish, and 6.0% Irish.

The median age was 39.4 years old. 7.9% of the population were between the ages of 65 and 74. 36.9% of the population were under 18, with 20.5% under 5, and 16.4% between the ages of 5 and 14.

The median income for married couples was $93,138. 58.8% of the population was in poverty, with 77.0% of people under 18, 54.9% of people between the ages of 18 and 64, and 0.0% of people over 65 were in poverty.

Historical population

Census	Pop.	Note	%±
2020	475		—
U.S. Decennial Census