Tennant is a census-designated place (CDP) in Siskiyou County, California, United States.

[2] According to the United States Census Bureau, the CDP has a total area of 0.2 square miles (0.52 km2), 99.81% of it land and 0.19% of it water.

This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F.

15 households (55.6%) were made up of individuals, and 8 (29.6%) had someone living alone who was 65 years of age or older.

There were 89 housing units at an average density of 366.3 per square mile (141.4/km2), of which 20 (74.1%) were owner-occupied, and 7 (25.9%) were occupied by renters.

44.1% of all households were made up of individuals, and 26.5% had someone living alone who was 65 years of age or older.

There were 31.3% of families and 34.8% of the population living below the poverty line, including 100.0% of under eighteens and 8.3% of those over 64.

[8] Federally, Tennant is in California's 1st congressional district, represented by Republican Doug LaMalfa.