In 1913,
the parish of Morden was
transferred from the Croydon Rural District to the Merton Urban
District and the district was renamed Merton and Morden
Urban District.
In 1943, the council was granted a civic coat of arms incorporating Lions from the
Garth Family arms and the
fret from the arms of Merton Abbey. The
motto, "In Libertate Vis", means "Our Strength is our
Freedom".