[3] A new high school was constructed and opened for use in September 1905 on East Montgomery Avenue and Monroe Street.

[14] On June 10, 2008, Montgomery County Public Schools announced that Carrasco had been named the new director of secondary leadership training.

[15] On June 23, 2008, Nelson McLeod II was named the new principal of Richard Montgomery High School.

[18] In 2020, a petition was started to rename the school due to its namesake, Richard Montgomery, being a slave owner.

The new building features wireless internet for the teachers which has since been opened to student access, LCD projectors in every classroom, dozens of Promethean interactive whiteboards and learner response devices, a modern auditorium, and a recording and TV studio.

This competitive-entry magnet programme draws students from all over Montgomery County and has an IB diploma rate of 97%, the highest of its kind in the United States.

[24] The MYP curriculum stresses "life long learning," "critical thinking," and "responsible global citizenship."

Richard Montgomery has also had multiple Marian Greenblatt Education Fund award winner teachers.

[30] Fine Lines has received various Gold Crown Awards from the Columbia Scholastic Press Association, including in 2003.

[33] Richard Montgomery's International Space Settlement Design Competition team won the 2008 cycle in Houston, Texas.

Under longtime coach Daniel Evans, who retired in 2024, the team won twenty-six Montgomery County championships, reached fifteen statewide Final Fours, appeared in ten state finals, and won five state championships, most recently in 2019 and 2023.