Trinway is an unincorporated community and census-designated place in northern Cass Township, Muskingum County, Ohio, United States, in the east-central part of the state. The village is 52 miles east of the state capital of Columbus and near the town of Dresden.

The community was originally known as "Dresden Junction", as it was the point where the Cincinnati and Muskingum Valley Railroad met the Stuebenville and Indiana Railroad (which later became part of the Pittsburgh, Cincinnati, Chicago and St. Louis Railroad). It was also the site of the first railroad station for the nearby village of Dresden.

There are several buildings of special historic interest in Trinway, including:

• The old Trinway School (Built 1880, located on 2nd Avenue)
• The Trinway Methodist Church (Built 1868, located at 12750 2nd Avenue, Trinway)
• The Cochran House (Built 1862, located at 12635 Main Street, Trinway)
• The Prospect Place Estate (Built 1856, located at 12150 Main Street, Trinway)

Trinway is the location of the township hall for Cass Township.

Students from Trinway attend the schools of the Tri-Valley Local School District.

Historical population

Census	Pop.	Note	%±
2020	358		—
U.S. Decennial Census

As of the census of 2010, there were 365 people, 138 households, and 91 families residing in the village. The racial makeup of Trinway was 97% White, 0.3% African American, 0.0% Native American, 0.0% Pacific Islander, 0.0% from other races, and 2.7% from two or more races. Hispanic or Latino of any race were 0.3% of the population.

There were 138 households, of which 33.3% had children under the age of 18 living with them, 50.7% were married couples living together, 10.9% had a female householder with no husband present, and 34.1% were non-families. 29.0% of all households were made up of individuals, and 26.1% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.24.

In the village the population was spread out, with 33.2% under the age of 19, 1.9% from 20 to 24, 32.1% from 25 to 44, 20.3% from 45 to 64, and 12.6% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 117 males. For every 100 females age 18 and over, there were 102 males.

• Trinway, Ohio demographics