Yokosuka (, Yokosuka-shi) is a city located in Kanagawa, Japan. As of 2010, the city had an estimated population of 419,067and a population density of 4,160people perSquare kilometers. It covered an area of 100.62Square kilometers. Yokosuka is the 11th most populous city in Greater Tokyo, 12th in the Kant region. Yokosuka occupies most of Miura Peninsula, and is bordered by the mouth of Tokyo Bay to the east and Sagami Bay on the Pacific Ocean on the west. The area around present-day Yokosuka city has been inhabited for thousands of years. Archaeologists have found stone tools and shell middens from the Japanese Paleolithic period and ceramic shards from the Jmon and Kofun periods at numerous locations in the area.