In 1921, the club joined the County Championship and the team was elevated to first-class status, subsequently playing in every top-level domestic cricket competition in England and Wales.

The club is based in Cardiff and plays most of its home games at Sophia Gardens, which is located on the bank of the River Taff.

Glamorgan won the county championship in 1948 under the captaincy of Wilf Wooller, whose advocacy of high fielding standards was the key to beating stronger batting and bowling teams.

The 2005 captain, off spinner Robert Croft, proved effective on England tours, and was a useful pinch hitter in List A one-day games.

The club had plans in April 2006 to extend its grounds in the Grade 2 Listed Heritage Park that is Sophia Gardens, with a 17,500 seat super-stadium.

In 2021 Glamorgan won their first trophy for seventeen years, defeating Durham by 58 runs in the final of the Royal London One-Day Cup.