Specifically, it consists of the part of the city lying east and north of a line drawn from the northern limit of the city south along Highbury Avenue North, west along the Thames River (South Branch), south along the Canadian National Railway, west along Commissioners Road East, south along Wharncliffe Road South, east along Southdale Road East, south along White Oak Road, east along Exeter Road, north along Meg Drive, west along Jalna Boulevard, north along Ernest Avenue, east along Bradley Avenue, north along Highbury Avenue South, east along Arran Place and Bradley Avenue to the eastern limit of the city.

The riding was created in 1996 from parts of London East and London—Middlesex. From 1997 until 2005 it was represented by Liberal/Independent Member of Parliament Pat O'Brien.

It consisted initially of the part of the City of London lying east and north of a line drawn from the northern limit of the city south along Highbury Avenue and Highway 126, west along the Thames River, south along the Canadian National Railway tracks, west along Commissioners Road East, south along Wharncliffe Road South, east along Southdale Road East, south along White Oak Road, east along Exeter Road, north along Meg Drive, west along Jalna Boulevard, north along Ernest Avenue, east along Bradley Avenue, north along the Highbury Avenue, east along Arran Place and Bradley Avenue to the eastern limit of the city.

In 2003, it was given its current boundaries as described above.

This riding gained territory from London North Centre and Elgin—Middlesex—London during the 2012 electoral redistribution.

This riding has elected the following members of the Canadian House of Commons:

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