Neumünster is a city in the middle of Schleswig-Holstein, Germany. With more than 79,000 registered inhabitants, it is the fourth-largest munic…Neumünster is a city in the middle of Schleswig-Holstein, Germany. With more than 79,000 registered inhabitants, it is the fourth-largest municipality in Schleswig-Holstein. The Holstenhallen and the Stadthalle make the city an important trade fair location.