Södertälje is a city in Stockholm County, Sweden and seat of Södertälje Municipality. It is also a part of Greater Stockholm Metropolitan Area. As of 2020, it has 73,872 inhabitants. Södertälje is located at Mälarens confluence in to the Baltic Sea through the lock in the Södertälje Canal. Since year 2000, it is the largest city located entirely within the province of Södermanland.