Of 27,000 people across Argyll and Bute, 25,000 are over the age of 60 and more than 2,000 disabled people.
The figures follow an announcement from Transport Scotland last week that a further £414m will be invested in the scheme over the next two years.
This will ensure Scotland-wide free bus travel will continue to be available for people over the age of 60, injured service veterans and people with disabilities.
West of Scotland MSP Stuart McMillan welcomed the news.
He said: “The SNP Government’s deal to ensure concessionary bus travel continues in coming years is hugely significant – and this new research shows just how important this investment is to the thousands of older and disabled people in Argyll and Bute who are benefiting from this scheme.
“Funding for the scheme has increased every year since its introduction and with the scheme helping older people, disabled people – and now injured armed services veterans too - to make almost 147 million journeys last year, it is vital the scheme continues.” Around 1.3m people across Scotland benefit from the scheme.
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