Greenville is a borough with home rule status in northwestern Mercer County, Pennsylvania, United States.

Located along the Shenango River, it lies roughly 80 miles from both Pittsburgh and Cleveland.

It was home to the Werner Company, the world's largest manufacturer of step and extension ladders.

Greenville was known for its manufacturing interests, including railroad shops, bridge works, gristmills, a cement-block plant, an automobile factory, foundries and machine shops, saw and planing mills, steelworks, a railroad-car manufacturer, and flour mills.

The early products were job tools, thread, and metal trim for carpet thresholds.

The company is growing rapidly today, headquarters at 93 Werner Road in Greenville.

[19] The borough owns and maintains seven parks in Greenville, the biggest being Riverside Park, which houses its own recreation center, outdoor amphitheater, which was just newly renovated, and a new playground, which was built in 2012 by community volunteers.

Riverside Park was previously home to the Greenville Memorial Pool, which opened in 1952 and closed in 2009.

A sports complex is housed in the adjacent West Salem Township, where community softball, soccer and football programs are held.

[20] The Greenville Area Community Theatre is open to people ages 18 and over.

This includes a fireworks display, crafters and vendors, historical reenactments, children's activities, and the area's largest free car show.

The post office is considered among the finest of Depression-Era design, built under the WPA program during the Roosevelt administration.