Local residents include the the Queen and Elton John, so it's perhaps of little surprise that Windsor tops the table of the country's wealthiest settlements with fewer than 30,000 people.
The Berkshire town is closely followed by Weybridge and Sevenoaks, according to analysis by consultancy WealthInsight.
Eight out of ten of the small towns in Britain with the most millionaires are located in the South East. And seven of these are located in a pocket of wealth across the Thames Valley.
Alderley Edge and Hake are the only two places in the top ten that don’t count London as their nearest major city.
“It is interesting to see that a couple small towns around Manchester also make the list. This reflects the affluent nature of the Cheshire area,” said WealthInsight analyst Andrew Amoils.
But it's Henley that has the fastest growing wealth, as the number of millionaires living there increased by 25% between 2007 and 2012. The number of millionaires in the UK declined overall by 9% during this period.
Narrowly missing a place in the list were the Cotswold towns Burford and Chipping Campden, as well as northern towns Ponteland and Windemere.
The property market in table-topping Windsor has a bright future, according to Phil Warren from Fine & Country Windsor.
"Prices are increasing with a lot of interest coming from overseas buyers hoping for a slice of the Windsor lifestyle that is less manic than London," he commented.
"There is also a quick turnaround when properties go on the market in the Windsor and Eton areas, usually 3 or 4 weeks."