Some 36% of crime on the islands is thought to have been alcohol-related in 2017, while 60% of crimes occurred "in or around licensed premises".
The figures are included in a report outlining Public Health Services provided to the Isles of Scilly ahead of July 10th's meeting of the Council's Health & Wellbeing Board.
It also states that in 2017, 36% of offences and antisocial behaviour were directly attributable to the consumption of alcohol and six offences were also drug related.
Two alcohol deaths within the past 12 months have been looked at by the coroner, including a Regulation 28 (action taken to prevent deaths in similar circumstances).
The report, by Cornwall Council's Interim Director of Public Health Dr Caroline Court, also says that levels of increasing risk and higher risk alcohol use within the Isles of Scilly population "run at minimum of 25% and may be as high as 40%".
It continues: "Indicators such as prevalence of correlated disease with high levels of alcohol consumption such as hypertension, all forms of cancer, stroke, mental illness and gastro intestinal disorders is similar to Cornwall, and slightly higher than the national average (Public Health data)."
Over the counter medication sales of opioid medication and other analgesics was high but is reducing, while there are "low levels of benzodiazepine prescribing and low indicators of the use of other drugs, mainly cannabis, cocaine, ecstasy and New Psychoactive Substances".
There are 70 licensed premises on the islands, making it a "geographical concentration similar to Newquay".