The area incorporating the current suburb of Ridleyton was originally granted to Osmond Gilles in March 1839. He later transferred it to John Ridley, inventor of the stripper or reaping machine, in June 1842 for £275. In 1873, Ridley lodged a plan to subdivide his land, naming one part Ridleyton.

Ridleyton is primarily bounded by South Road, Torrens Road, Wood Avenue and Blight Street. The suburb includes the northwestern end of the redeveloped Hawker Street precinct.

The 2006 Census by the Australian Bureau of Statistics counted 938 persons in Ridleyton on census night. Of these, 46.3% were male and 53.7% were female.

The majority of residents (59.4%) are of Australian birth, with other common census responses being Vietnam (4.4%), England (3.6%), Greece (3.3%) and China (2.1%).

The age distribution of Ridleyton residents is similar to that of the greater Australian population. 71.4% of residents were over 25 years in 2006, compared to the Australian average of 66.5%; and 28.6% were younger than 25 years, compared to the Australian average of 33.5%.

Ridleyton is part of Hindmarsh Ward in the City of Charles Sturt local government area, being represented in that council by Paul Alexandrides and Craig Auricht.

Ridleyton lies in the state electoral district of Croydon and the federal electoral division of Adelaide. The suburb is represented in the South Australian House of Assembly by Michael Atkinson and federally by Kate Ellis.

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