Hanover is a city in Washington County, Kansas, United States. As of the 2020 census, the population of the city was 690. The city is primarily agricultural, and the surrounding countryside is filled with small family farms. Named after Hanover, Germany, the town is a traditional German community with strong German cultural influences. The local area is home to numerous other German communities such as Hollenberg, Hermansburg, Frankfort, and Bremen.