Dubuque (listen) is the county seat of Dubuque County, Iowa, United States, located along the Mississippi River. At the time of the 2020 census, the population of Dubuque was 59,667.The city lies at the junction of Iowa, Illinois, and Wisconsin, a region locally known as the Tri-State Area. It serves as the main commercial, industrial, educational, and cultural center for the area. Geographically, it is part of the Driftless Area, a portion of North America that escaped all three phases of the Wisconsin Glaciation. Dubuque is a tourist destination featuring the city's unique architecture and river location. It is home to five institutions of higher education, making it a center for culture and learning. Dubuque has long been a center of manufacturing, but the economy grew rapidly and diversified to other areas in the first years of the 21st century. By 2005, the city led the state and the Midwest in job growth, ranking as the 22nd-fastest growing economy in the US. Alongside industry, the city has large health care, education, tourism, publishing, and financial service sectors.

Blackhawk is an unincorporated community in Carroll County, Illinois, United States. Balckhawk is located near Illinois Route 84, north of Savanna.

Darlington is a city in and the county seat of Lafayette County in the U.S. state of Wisconsin. The population was 2,451 at the 2010 census. The city is surrounded by the Town of Darlington.

Eastern Iowa Airport (IATA: CID, ICAO: KCID, FAA LID: CID) is in Cedar Rapids, Iowa, on Wright Brothers Boulevard on the south edge of town, two miles (3.2 km) west of Interstate 380. CID covers 3,288 acres (1,331 ha).