In the year 1869, it separated from Farmington due to the distance of the town center and the growth of Plainville downtown due to the installation of the New York, New Haven and Hartford Railroad and the Hartford, Providence, and Fishkill Railroad.

[2] The east side of the town is bordered by two prominent peaks of the Metacomet Ridge: Pinnacle Rock and Bradley Mountain.

Key employers includes, Wheeler Clinic, Manafort Bros. Construction, Gems Sensors & Controls, Tilcon Connecticut, and Americold.

Plainville holds an annual Hot Air Balloon Festival at the end of August at Norton Park, gathering many of the townspeople together for fun-filled nights of games, music, and fireworks.

This event is a downtown, outdoor festival featuring live music, a kid's costume parade, games, a large variety of food trucks, a haunted house, and many local vendors, downtown restaurants, and businesses.

In June at Robertson Field, the airport hosts the annual Plainville Wings & Wheels fly-in and car show.

This event supports the Petit Family Foundation and the Plainville Community Food Pantry.

Finally, Plainville is the home of Robertson Field, the oldest private airport in Connecticut.

The Plainville High School cheer team are Central Connecticut Conference Grand Champions, having won the title in 2017, 2018, 2019, 2020, & 2022.