Sardinia is a village in Brown and Highland counties in the U.S. state of Ohio. The population was 980 at the 2010 census.
Sardinia was laid out in 1833. The village's name is derived from the homonymous island in the Mediterranean Sea. Historically, Sardinia was a post village of Brown County, in Washington township, established in 1830, situated on the east fork of White Oak Creek, 12 miles (19 km) north-east of Georgetown, and 44 miles (71 km) east of Cincinnati. In 1860, Sardinia's population was 200 and Washington Township had a population of 1,300.
Sardinia is located mostly in Washington Township in Brown County, and partly in Clay Township in southwestern Highland County, at 39°0′31″N 83°48′15″W (39.008718, -83.804213),
According to the United States Census Bureau, the village has a total area of 1.24 square miles (3.21 km2), all land.
As of the census of 2010, there were 980 people, 363 households, and 259 families living in the village. The population density was 790.3 inhabitants per square mile (305.1/km2). There were 416 housing units at an average density of 335.5 per square mile (129.5/km2). The racial makeup of the village was 99.2% White, 0.2% African American, 0.3% Native American, 0.1% from other races, and 0.2% from two or more races. Hispanic or Latino of any race were 0.3% of the population.