Hamburg is the most southwestern city in Iowa hugging the borders of Missouri to the south and Nebraska to the west. It derives its name from the German city of Hamburg. It is the corporate headquarters of Vogel Popcorn which claims to be the source of 52 percent of the popcorn grown in the United States.It is located in Fremont County, Iowa, United States, and is situated between the Nishnabotna River and the Missouri River. The population was 1,187 at the 2010 census.