Celina is situated on the northwestern shores of Grand Lake St.

[10] By the 1880s, the town had grown significantly, primarily due to the discovery of deposits of oil and natural gas nearby.

Numerous homes, building, trees, and power lines and poles were damaged or destroyed.

Huffy Bicycle and Mersman Furniture formerly had manufacturing plants in Celina but have since closed.

Companies such as Celina Aluminum Precision Technology (a Honda supplier), Crown Equipment Corporation (located in Huffy's former location), and Reynolds and Reynolds are the largest manufacturing employers.

Agriculture is a significant part of the economy, including soybeans, corn, and wheat.

[17][failed verification] Celina hosts the annual Freedom Days Picnic in early July in honor of American Independence.

The Lake Festival is host to one of the largest Amphicar gatherings in the world.

During the second week in August, Celina is home to the Mercer County Fair and hosts many arts and crafts, livestock, food, rides, and the demolition derby.

Celina hosts the annual Governors Cup Regatta which features hydroplane racing on Grand Lake St. Marys.

The Celina-Mercer County Head Start Program is for children in Pre-School.

WCSM-AM broadcasts at 1350 and features news, talk, and the Music of Your Life adult standards format.