Nyköping is a locality in Sweden, situated in the Södermanland County. It serves as the seat of Nyköping Municipality and is located on the eastern coast of Sweden, near the Baltic Sea. The town has a rich history, dating back to the Middle Ages, and features several historical buildings, including the Nyköping Castle. The population of Nyköping is approximately 30,000 residents, making it one of the larger towns in the region. The town is known for its beautiful parks, waterfront areas, and cultural events. It also serves as a hub for transportation, with connections to Stockholm and other nearby cities.