Greater Bristol is a term used for the conurbation which contains and surrounds the city of Bristol in the South West of England. There is no official "Greater Bristol" authority, but the term is sometimes used by local, regional and national authorities, and others as a synonym for either the "Bristol Urban Area" or the wider area of the former County of Avon. The Bristol post town covers a wider area than the city of Bristol.
Problems of definition 
One definition of "Greater Bristol" is the "Bristol Urban Area" as defined by the UK Office for National Statistics (ONS). This covers the contiguous built-up area around Bristol, including the Kingswood, Mangotsfield, Stoke Gifford, Bradley Stoke, Patchway, Filton, Almondsbury, Frampton Cotterell and Winterbourne areas within South Gloucestershire; Easton-in-Gordano within North Somerset; and part of Whitchurch which falls within the administrative area of Bath and North East Somerset. However, this ONS definition does not include the city of Bath, Weston-super-Mare, or even small towns closer to Bristol such as Yate, Keynsham or Portishead.
The wider "Greater Bristol" area - that is, the former Avon area - has since 1996 been divided for local government purposes between Bristol City Council, and Bath and North East Somerset, North Somerset, and South Gloucestershire councils, and is shown on the map on this page. The boundaries of the County of Avon, which administered the area from 1974 to 1996, were similar to those of the Bristol Travel to Work Area as originally defined in the 1950s. The former county area is still used in some official UK statistics and by local and regional authorities, for example in transport planning, with the South West Regional Government Office commissioning a Greater Bristol Strategic Transport Study in 2005, and the local authorities presenting a Joint Local Transport Plan to the DfT in 2006. Other alternative names in official use for the former Avon area include the West of England and Severnside. The term "CUBA" (for The County that Used to Be Avon) has also occasionally been used unofficially.
The area within the administrative City of Bristol limits had a population of 380,615 according to the 2001 census. The ONS give a figure for the Bristol Urban Area of 551,066, making it the ninth largest conurbation in England and Wales; the 1991 census figure was 522,784. The 2001 population of the former county of Avon was 1,015,200.
According to the ONS, the Bristol Urban Area consists of the areas set out below. The ONS definition of Bristol itself goes beyond the City Council area, to include such areas as Filton, Bradley Stoke and Patchway - for details see this ONS map .
- Frampton Cotterell/Winterbourne
- Stoke Gifford