The one main transportation for Kennebec is by road (I‑90 and SD 273), as there is no airport, municipal or commercial.

There are no trains for passengers but the Ringneck & Western Railroad provides freight service to the Wheat Growers' Kennebec Elevator.

[9] According to the United States Census Bureau, the town has a total area of 0.85 square miles (2.20 km2), all land.

The racial makeup of the town was 90.0% White, 6.7% Native American, and 3.3% from two or more races.

The racial makeup of the town was 88.46% White, 6.64% Native American, 1.05% Asian, and 3.85% from two or more races.

About 3.9% of families and 8.1% of the population were below the poverty line, including 6.1% of those under the age of eighteen and 5.2% of those 65 or over.

Media related to Kennebec, South Dakota at Wikimedia Commons