BBC Local Radio collectively lost over 4.5 million listening hours in the last quarter alone, suffering losses in reach, average hours and market share.
Many stations saw their audience collapse; BBC Radio Lancashire saw its figures slump to an all-time low in every measure, as did BBC Radio Manchester.
BBC Radio Newcastle's share of audience hit a new low, while total hours reached their lowest since 1999.
Total listening for BBC WM and BBC Southern Counties Radio went into freefall over the past three months; BBC WM lost nearly a quarter of its hours – over one million – while Southern Counties lost almost a third of theirs.
A handful of stations saw significant gains – BBC Cumbria, BBC Hereford & Worcester and Nottingham – but the losses far outweighed the gains at the majority of stations.