List of Parliamentary constituencies in Avon
Avon was abolished in 1996 both as a county council and a ceremonial county, but the name Avon continues to be used unofficially in subsequent boundary reviews as presented by the Boundary Commission for England to describe the area covered by the former county for the purpose of the rules which strongly deter cross-council constituencies (spanning more than one local authority within its area).
The Boundary Commission for England reviewed Avon in 2000 and devised a constituencies scheme in which no constituency spanned the four unitary authority boundaries within the abolished county. This entailed four seats to Bristol, three to South Gloucestershire and two each to Bath and North East Somerset and North Somerset and accordingly a net increase of one seat. Constituency names were aligned with the new local council names. These changes were implemented at the 2010 general election. Bath was restored as a borough constituency (to which a different election expenses quota and returning officer applies compared to county constituencies). Thus Avon has 6 Borough constituencies and 5 County constituencies.
The immediate predecessor constituency definitions had persisted, with slight amendments in 1997, from before the general election in 1983 to that of 2005. The area had been used as a convenient unit for division into ten Parliamentary constituencies (five Borough constituencies and five County constituencies).