City of London four of the eight wards accounted for 67% of the 'square mile' and held 86% of the population, and these were in fact similar to and named after four City of London wards: The City has a unique electoral system. Most of its voters are representatives of businesses and other bodies that occupy premises in the City. Its ancient wards have very unequal numbers of voters. In elections, both the businesses based in the City and the residents of the City vote. The City of London Corporation was not reformed by the Municipal Corporations Act 1835, because it had a
City of London up the centre of the Thames, with the exception that Blackfriars Bridge falls within the City; the City controls London Bridge (as part of Bridge ward) but only half of the river underneath it, a feature which is unique in British local administration. The boundaries are marked by black bollards bearing the City's emblem, and by dragon boundary marks at major entrances, such as Holborn. A more substantial monument marks the boundary at Temple Bar on Fleet Street. In some places the financial district extends slightly beyond the boundaries, notably to the north and east, into the London Boroughs of