France in the Ancien Régime covered a territory of around 200,000 square miles , and supported 22 million people in 1700. At least 96% of the population were peasants. France had the largest population in Europe, with European Russia second at 20 million. Britain had nearly six million, Spain had eight million, and the Austrian Habsburgs had around eight million. Russia was the most populated European country at the time. France's lead slowly faded after 1700, as other countries grew faster.. Which country had a larger population, Spain or Britain?