Old Eucha is a census-designated place (CDP) in Delaware County, Oklahoma, United States.

It is bordered to the southwest by Kenwood and to the southeast by Tagg Flats.

According to the United States Census Bureau, the Old Eucha CDP has a total area of 3.1 square miles (8.0 km2), all land.

[3] As of the census[5] of 2000, there were 46 people, 14 households, and 14 families residing in the CDP.

There were 9.5% of families and 12.4% of the population living below the poverty line, including 20.0% of under eighteens and none of those over 64.