Blair Athol was originally a private subdivision of section 357 in the Hundred of Yatala in the vicinity of today's Lionel Avenue. The suburb name was formalised in 1944 at which time the boundaries stretched from Grand Junction Road to Irish Harp Road. In 2000, the portion south of Angwin Avenue and its easterly projection to Main North Road was annexed by Prospect. The historic area known as Gepp's Cross overlaps the north east corner of the modern suburb and includes the historic Gepps Cross Hotel. The modern suburb of Gepps Cross occupies only the land north of the intersection. Blair Athol Post Office opened on 15 June 1955 and was renamed Blair Athol West in 1966. At that time the existing Enfield office was renamed Blair Athol and it was replaced by the Enfield Plaza office in 1997.
Reserves
Blair Athol has two reserves, Blair Athol Recreational Reserve and Barton Street Reserve. The Blair Athol Recreational Reserve is a large reserve covering a total area of approximately. It features a football oval, a cricket ground with batting cages, two netball/basketball courts, and tennis courts which are exclusively used by members of the Kilburn tennis club. The reserve also has two playgrounds, a gazebo, the Kilburn Footy Club and a large parking lot. Barton Street Reserve features a large grass field and a playground with several benches. This reserve covers a total area of approximately.
Government
Blair Athol is run by the City of Port Adelaide Enfield. The council was set up in 1996 and one of its main offices is located in Enfield. The South Australian Education Department helped set up the school system in Blair Athol and Kilburn. Blair Athol has three main schools. Gepps Cross Primary School and St. Paul Lutheran Primary School cater for levels 1–7. Gepps Cross Senior School is the only secondary school in Blair Athol and is partners with Enfield High School.
Shopping
Blair Athol has one of the few family-owned hardware stores left, Randall's Hardware, next to another family-owned business Pets Everywhere. There was formerly a Coles Supermarkets located on the corner of Florence Avenue and Prospect Road. This supermarket ceased operation in July 2016, with the site to be redeveloped. It was reopened in 2017 as an IGA featuring products from Afghanistan, Iran and Pakistan. Kilburn Post Office is located across the road from it.
Transport
Blair Athol is serviced by the G10 bus line between Adelaide and Grand Junction Road, travelling via Prospect Road and also bus routes 221, 222, 224, 225, 226, 228 and 229, which travel between Adelaide and various destinations in the Northern suburbs via Main North Road. Residents of Blair Athol can also catch the train line to and from the city. The station is located in Kilburn, several hundred metres from Prospect Road.
