Blackrock covers a large but not precisely defined area, rising from sea level on the coast to 90 metres (300 ft) at White's Cross on the N11 national primary road. Blackrock is bordered by Booterstown, Mount Merrion, Stillorgan, Foxrock, Deansgrange and Monkstown.

Blackrock is a large commercial centre with cafes, restaurants, an award winning independent fine wine and craft beer store (Blackrock Cellar), boutiques, hairdressers and barbers, a tattoo and piercing studio, pharmacies, supermarkets, art galleries, antiques and home improvements outlets as well as bars such as The Breffni, Jack O'Rourkes, Flash Harry's, Conways, The Wicked Wolf, Kelly & Coopers and the Ten Tun Tavern.

The Blackrock Shopping Centre was built in 1984 by Superquinn who managed the development and are the anchor store. Superquinn has now become Supervalu.

There are many high street finance branches for AIB, Bank of Ireland, EBS, National Irish Bank, Ulster Bank and the Blackrock Credit Union. Permanent TSB closed their Blackrock branch in March 2010 but retain their administrative offices on Carysfort Avenue.

There are many office buildings that house large corporations such as Zurich Financial Services and AIG, and car dealers such as Carroll & Kinsella Motors, Maxwell Motors (generally BMW) and Eco Aer (eco electric vehicles).

The Blackrock Market was set up in 1996 just off Main Street and has a range of independent sellers who sell all sorts of items like bean bags, candles, stamps and coins, second-hand books and antiques. In addition to a number of food stalls selling crepes, cakes and ethnic food, there are a number of restaurants including 3 Leaves, Hook't and the Michelin starred Liath Restaurant. The market is open Saturday and Sunday, but some stalls open during the week also.

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