Cascade is a city in Dubuque and Jones counties, Iowa, United States. The Dubuque County portion is part of Dubuque Metropolitan Statistical Area, while the Jones County section is part of Cedar Rapids Metropolitan Statistical Area. The population was 2,386 at the 2020 census, up from 1,958 in 2000. The city is located within southwestern of Dubuque County and north-central Jones County.

Dubuque County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 99,266, making it the eighth-most populous county in Iowa. The county seat is Dubuque. The county is named for Julien Dubuque, the first European settler of Iowa.