Iowa Highway 17 is a 103-mile-long (166 km) north–south state highway that traverses primarily rural areas in central and north-central Iowa. Iowa 17's southern end is near Granger in Dallas County at a freeway interchange with Iowa Highway 141, and its northern terminus is at an intersection with U.S. Highway 18 at the Kossuth-Hancock county line near Wesley.

Dallas County is a county located in the U.S. state of Iowa. As of the 2020 Census, the population was 99,678, making it the seventh-most populous county in Iowa. Between 2010 and 2020, it was the fastest growing county in Iowa and one of the fastest growing in the country. Its county seat is Adel, and its largest city is Waukee. The county was named for George M. Dallas, Vice President of the United States under James K. Polk, the namesake of neighboring Polk County.