Early years Knight started her teaching career at sixteen. Over the years, she taught in three different states. She started as an apprentice in Michigan and worked there for several terms. Later, she joined her family in Dakota, where she worked in
Huron city schools for several years.
Washington state After a brief return to
Eaton Rapids, Knight followed her parents to Washington state, settling in
Shelton in 1890. She became a pioneer educator of the city. She left Shelton for five years to live and teach in Whatcom (now
Bellingham), but returned to Shelton. Over the years, Knight gained respect and popularity as an educator, and in 1900, became a nominee for the position of Mason County Superintendent of Schools as a part of the
Democratic ticket. After a Democratic win, she was appointed to the position. Knight served as County Superintendent of Schools for eighteen years. During her term, she consolidated five small school districts in western
Mason County. The consolidation was completed in 1924 and offered students more educational opportunities than five separate school districts had. The newly formed district was later named in Knight's honor: Mary M. Knight School District No. 311. Among Knight's other duties was improving communication between state educators. In 1909, partnering with the Thurston County Superintendent, Knight helped conduct the joint teachers organization meeting in Olympia. The meeting took place at Winlock Miller High School and was attended by over 100 teachers. Over the years, Knight was known as "a pioneer Mason County educator." Her experience in education was judged "exceptional," she was called "an excellent official in all respects," and during the Mason County inspection in 1910, she was termed a "capable and efficient" specialist who "perfectly kept accounts and records."
Life in retirement and honors Knight retired in 1921. In later years, she was the keeper of several Washington historic relics that belonged to the family of
Major General of the
Confederate States Army George Pickett. These items were displayed in the Harry Hartman Gallery. The Mary M. Knight High School in
Matlock was named in Knight's honor. ==Personal life and family==