North London is the northern region of England's capital city. By some measures, it is the entire area north of the River Thames, which essentially divides Greater London into two halves, running east-west through the city. This definition is used by the Boundary Commission and means that North London makes up nearly two thirds of the entire city. By the Boundary Commission's map, North London includes the City of London and all its historic areas, the East and West End and most of the Tube. According to this definition, this large section of the city includes not only the City of London, but a number of London boroughs as well. Those boroughs are Barking and Dagenham, Brent, Camden, Barnet, Enfield, Ealing, Hammersmith and Fulham, Haringey, Hackney, Harrow, Hillingdon, Havering, Islington, Kensington and Chelsea, Redbridge, Newham, Waltham Forest, Tower Hamlets and Westminster. Although the London Borough of Richmond upon Thames falls on both sides of the River, it is considered part of South London by the Boundary Commission.
Within North London, there are a number of boroughs that are considered to be Inner London, namely Kensington and Chelsea, Islington, Hammersmith and Fulham, Hackney, Camden, Westminster and Tower Hamlets. The rest are part of Outer London. These designations were made in 1965 and still stand today. But North London doesn't only refer to the part of the city that lies north of the River Thames. It is also the name given to one of the sub regions in the London Plan. The North London sub region has existed since 2004, even though the boundaries changed slightly when the sub regions were re-designated in 2008. Originally, the North London sub region has four boroughs lying within its boundaries: Enfield, Barnet, Haringey and Waltham Forest. But today, Camden, Islington and Hackney have been added to the list of boroughs that lie within the North London sub region, bringing the total to seven. More than one million people call this sub region home.