As a civil parish, Crowmarsh has three tiers of local government. The lowest tier is Crowmarsh Parish Council, which has responsibility for minor matters such as allotments, open spaces and community halls. The parish council has 12 members, elected for a four-year term. The middle level is South Oxfordshire District Council (with responsibility for matters such as housing, planning and waste collection). The district is divided into 19 wards for the elections of councillors. Crowmarsh ward also comprises the parishes of Ipsden and Nuffield and elects one councillor to the 48 member authority. The upper tier of local government is Oxfordshire County Council, which administers "wide area" strategic services such as education, highways and social services. Crowmarsh forms part of the Benson electoral division, returning one councilor to the 74 member body.
