Arundel and South Downs Conservative Association covers the Parliamentary Constituency of Arundel and South Downs, encompassing downland wards within Chichester District Council, Arun District Council, Horsham District Council and Mid-Sussex District Council, all within the County of West Sussex. It is geographically spread out with an electorate of approximately 78,000 and is divided by two main rivers and several main roads.
The Parliamentary seat of Arundel and South Downs is considered a safe Conservative seat with a current majority of in excess of 26,000 votes. The current Member of Parliament for the Constituency is the Rt Hon Nick Herbert CBE MP, who was first elected to to the seat in 2005 and returned with increased majorities in both the 2010 and 2015 general elections and an increased share of the vote in 2017.
There are 35 district council elected representatives within the constituency, 34 of which are Conservatives, with the other seat being represented by an Independent. There are 11 West Sussex County Council elected representatives covering the whole of the Constituency, 10 of which are currently Conservative.
Membership of the Association is spread within a network of 5 branches represented by their own committees and volunteers.