Welcome to Plymouth, Indiana. The City of Plymouth is located on the banks of the Yellow River in north-central Indiana. Plymouth is the county seat for Marshall County and has a population of over 10,000 residents. Where Community and Possibilities Connect.

Welcome to Plymouth, Indiana, a friendly small city with big ambitions! Nestled along the Yellow River in north-central Indiana, Plymouth serves as the proud county seat of Marshall County and is home to more than 10,000 residents. Our community blends small-town charm with forward-looking growth, offering rich history, active local government, and plenty of opportunities to connect, live, and thrive. Explore our website to learn more about city services, community events, and why Plymouth is a great place to visit, work, and call home.