The figures, which do not include visits via mobile, show the UK was ranked the seventh-highest country in terms of monthly visitors, close behind Japan, but falling some way short of France and Germany, and emerging markets Brazil and India.
Worldwide traffic for the site in November was 66.7 million unique visitors, with 14.7 million of those coming from the top territory, the US.
Google+ recorded its second-highest traffic from internet users in India for that period, with 4.3 million unique visits, followed by Brazil with 3.6 million.
Its UK traffic is still a long way from rivalling Facebook, which received 32.3 million unique visits. Twitter received 8.7 million.