The suburb is residential, apart from a light industrial pocket to the south.
The area now including Pennington was subdivided in 1909 by Captain Alfred Hodgeman, who named a section after his wife, the former Helen Pennington. The Pennington Post Office opened on 1 May 1939 and closed in 1997.
Pennington was the site of a migrant hostel from 1950 until it closed in 1985. It was known as Finsbury Hostel from 1949 to 1966, then renamed to Pennington. It initially consisted of Nissen huts, Romney huts and Quonset huts, mostly second hand Army surplus. The huts provided dormitory and family accommodation, with separate dining, recreation and latrine buildings. Despite official closure, accommodation continued for migrants up to the mid-1990s.
The age distribution of Pennington residents is comparable to that of the greater Australian population. 66.9% of residents were over 25 years in 2006, compared to the Australian average of 66.5%; (and 33.1% were younger than 25 years, compared to the Australian average of 33.5%).
The suburb includes Pennington Primary School and the R-2 campus of Pennington Junior Primary School. Mount Carmel Primary School is also in Pennington.
There are shops and medical practices on Addison Road.
The largest park in Pennington lies between Butler Court, Booker Court and Windsor Avenue.
The Pennington Oval on Butler Avenue provides a venue for regular local sporting fixtures.
The suburb is served by the following main roads:
- Grand Junction Road, running east–west from Vista to Queenstown
- Addison Road, running through the middle of Pennington.
- Torrens Road, running northwest from North Adelaide, terminates in Pennington.
Pennington is served by public transport run by Adelaide Metro.
There is no train stop in Pennington itself; the closest statian is St Clair
Grand Junction Road is served by the 230, 232, 254 and the 254X express bus services. Torrens Road is served by the 230 and 232 services. Park Avenue and Northgate Streets are served by the 252 service.
- Australian Bureau of Statistics (25 October 2007). "Pennington (State Suburb)". 2006 Census QuickStats. Retrieved 30 November 2010.
- The Manning Index of South Australian History - Pennington
- Premier Postal History. "Post Office List". Premier Postal Auctions. Retrieved 26 May 2011.
- "Finsbury / Pennington". Migration Museum, Adelaide. Archived from the original on 24 June 2016. Retrieved 13 June 2016.
- City of Charles Sturt
- Local Government Association of SA - City of Charles Sturt
- 2006 ABS Census Data by Location