The first contract was issued to George and Coryell Dunlap effective June 30, 1877. The first claim was awarded to John P Clark for policy #101 on December 10.
A resolution was adopted in 1887 to extend the company writing territory to all parts of the county except the boroughs of Laporte, Dushore, Bernice, Sonestown, Muncy Valley, and Eagles Mere.
The in-force insurance in 1903 was $932,147.
A resolution was adopted effective January 1, 1976, for all new and renewal contracts to be issued as non-assessable policies.
The company shorten/changed their name to Farmers' & Mechanics' Mutual Insurance Company in 1983. The same year, the company received approval to write homeowner, mobile homeowner, and farmowner contracts and to increase their standard deductible to $100.00.
The company affiliated with Lititz Mutual Insurance Company of Lititz, PA on July 19, 1999.
The merger of Union Mutual Insurance Company of Westmoreland County into F&M was effective January 1, 2001.