Halfway Point: Billings, MT to Pontiac, MI

The geographic midpoint between **Billings, Montana** and **Pontiac, Michigan** is near **Oacoma, South Dakota**.

Coordinates

43°59′59.999″ N, 99°15′00″ W

Context

• Oacoma is a small town in Lyman County, on the **Missouri River** (Lake Francis Case), just across from **Chamberlain** (I-90 Exit 263).
• Distance each way: ~800 miles (1,287 km).
• Driving time each way: ~11.5–12 hours.
• Route: I-90 nearly the entire way (Billings → Butte → Missoula? No — I-90 east from Billings across MT, WY, SD, MN, WI, IL, IN, OH, MI).

Practical Stop

Chamberlain/Oacoma is a **natural overnight stop**: hotels, gas, food, **Akta Lakota Museum**, **Dignity Statue** (50-ft Native woman), Missouri River views. Ideal for breaking the 23–24 hour drive.