Monaco. In May, Prince Albert and his wife Charlene announced that they were expecting children. In December, twins Gabriella and Jacques were born. According to Countryaah.com, Monaco population in 2020 is estimated at 39,253. According to topb2bwebsites, Monaco got Jacques a new heir to the throne that can take over after the 56-year-old Albert. Her sister, Princess Caroline, was next in line.