According to the 2021 census gazetteer files, Clay City has a total area of 1.78 square miles (4.61 km2), all land.

Solomon and Ida had children : Isom, Mary, Otto, Roy, Louise and Zella all born in Clay City.

Great-grandchildren of Louise: Wallace, and Caroline left Clay City, for St. Louis, Mo.

Paul George left for Ohio, and ultimately lost oil and mineral rights in Clay City/C In 1810 John McCawley and Seth Evans were traveling west from Fort Vincennes along the old Buffalo Trace when one of their horses died.

McCawley stayed behind in a cabin built on the west bank of the Little Wabash River just south and east of the future Clay City.

In 1825 Daniel May donated 20 acres (81,000 m2) of land, just over 2 miles (3 km) west of McCawley's Tavern, to the county for the purpose of constructing a courthouse.

A two-room courthouse was constructed in 1825, and court was held at Maysville until 1841 when it was moved to the new and present county seat, Louisville.

In 1855, after the O&M Railroad was located about 1 mile (1.6 km) north of Maysville, Clay City was established by Mr. J.D.

With the passenger trains stopping in Clay City it also served as a source of transportation for the surrounding area.

In 1936 oil was discovered in this area, and oil-related businesses continue to thrive in Clay City today.