Clementi's arterial road, Clementi Road, runs for some 5 kilometres, from the vicinity around Bukit Timah, at Jalan Anak Bukit, to the West Coast Highway, but the geographical entity of Clementi is generally regarded as the area dominated by HDB apartment blocks around Commonwealth Avenue West and the Clementi MRT Station.
The primary residential district in Clementi is Clementi New Town and forms a large bulk of its residents and identity. The area also consists of many landed properties, especially in the West of the area. The boundaries of Clementi New Town are Sunset Way estate for the North, Clementi Road for the East, Clementi Woods for the South, and Sungei Pandan for the West.
Further from the town centre, a shopping complex, Ginza Plaza, used to serve residents near West Coast Road. However, it has been closed indefinitely. The shopping complex has been undergoing renovation and will be renamed as West Coast Plaza.
Towards Pasir Panjang, there is also the stretch of mostly 24-hour eating places, such as Fong Seng nasi lemak, Niqqi's cheese prata and also the new takeaway food store, Ai-Takeaway. National University of Singapore students frequent these popular late-night eating spots.
The Singapore Police 'D' Divisional Headquarters is located at Clementi Avenue 5. There is also a fire station off Commonwealth Avenue West.
In April 2005, the HDB announced plans to build a 40-storey complex in Clementi Central on the existing bus interchange site. The complex will comprise housing and commercial zones, a public library, and the renovated bus interchange. It is planned to be completed in 2010 and is tentatively named as The Clematis. A temporary bus interchange has been built at a site across the road from the old interchange.
The PAP slate for five-member West Coast GRC, comprising Lim Hng Kiang, Cedric Foo Chee Keng, S. Iswaran, Arthur Fong and Madeleine Ho Geok Choo, was unchallenged in the 2006 general elections. Arthur Fong currently represents the Clementi division of the GRC, while Iswaran represents the constituents residing in some HDB blocks around Clementi Avenue 1 and the Ginza Plaza area as part of the West Coast division.
Tertiary educational institutions in Clementi include Ngee Ann Polytechnic and a branch of the Institute of Technical Education - ITE Clementi. Singapore Polytechnic and the National University of Singapore borders on Clementi, although they are technically part of Queenstown. There is a direct bus from the Clementi bus interchange that loops around the NUS campus.
The Japanese School or Singapore Nihonjin gakko has two elementary school campuses on Clementi Road and Upper Changi Road North and a middle school campus on West Coast Road. Waseda Shibuya High School Singapore campus is also located at West Coast Road.