Question: What county is the city that owns Principal Park located in?

full_context: Document 1: Jack Trice Stadium: Jack Trice Stadium (originally Cyclone Stadium and formerly Jack Trice Field) is a stadium, in Ames, Iowa, United States. It is primarily used for college football and is the home field of the Iowa State Cyclones. It opened on September 20, 1975, with a 17–12 win over Air Force.
Document 2: Fort Dodge, Iowa: Fort Dodge is a city in and the county seat of Webster County, Iowa, United States, along the Des Moines River. The population was 25,206 in the 2010 census, an increase from 25,136 in the 2000 census. Fort Dodge is a major commercial center for North Central and Northwest Iowa. It is located on U.S. Routes 20 and 169.
Document 3: Chicago Cubs: The former location in Mesa is actually the second HoHoKam Park; the first was built in 1976 as the spring-training home of the Oakland Athletics who left the park in 1979. Apart from HoHoKam Park and Sloan Park the Cubs also have another Mesa training facility called Fitch Park, this complex provides 25,000 square feet (2,300 m2) of team facilities, including major league clubhouse, four practice fields, one practice infield, enclosed batting tunnels, batting cages, a maintenance facility, and administrative offices for the Cubs.
Document 4: Colo, Iowa: Colo is a city in Story County, Iowa, United States. The population was 876 at the 2010 census. It is part of the Ames, Iowa Metropolitan Statistical Area, which is a part of the larger Ames-Boone, Iowa Combined Statistical Area.
Document 5: Sloan Park: Sloan Park is an American baseball park in Mesa, Arizona which opened in 2014. The primary operator is the Chicago Cubs and the ballpark serves as their spring training home and is also the home of the Arizona League Cubs of the Arizona League and the Mesa Solar Sox of the Arizona Fall League. Sloan Park was built and paid for by residents of the City of Mesa, approved by ballot measure. It was primarily built to house spring training operations for the Chicago Cubs, who had previously played at nearby Hohokam Stadium. The stadium design was led by Populous. The dimensions of the playing surface closely match those of the Cubs' regular home stadium, Wrigley Field.
Document 6: Corydon, Iowa: Corydon is a city in Wayne County, Iowa, United States. The population was 1,585 in the 2010 census, a decline from 1,591 in the 2000 census. It is the county seat of Wayne County.
Document 7: Saylorville, Iowa: Saylorville is a census-designated place (CDP) in Polk County, Iowa, United States. The population was 3,301 at the 2010 census. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area. The Saydel Community School District is located in this area. The unincorporated community of Marquisville is in this area.
Document 8: Middletown, Iowa: Middletown is a city in Des Moines County, Iowa, United States. The population was 318 at the 2010 census. It is part of the Burlington, IA–IL Micropolitan Statistical Area.
Document 9: Principal Park: Principal Park, formerly Sec Taylor Stadium, is a minor league baseball stadium in Des Moines, Iowa. It is the home field of the Pacific Coast League's Iowa Cubs.
Document 10: Quad Cities River Bandits: The Quad Cities River Bandits are a Class A minor league baseball team, affiliated with the Houston Astros, that plays in the Midwest League. Its home games are played at Modern Woodmen Park (formerly John O'Donnell Stadium) in Davenport, Iowa, one of the Quad Cities.
Document 11: Indianola, Iowa: Indianola is a city in Warren County, Iowa, United States, 18 miles south of Des Moines, Iowa. The population was 14,782 at the 2010 census. It is the county seat of Warren County.
Document 12: Highland Park Stadium: Highland Park Stadium was built as the home of the Kokomo Giants in 1955, and then Kokomo Dodgers from 1956 to 1961. The stadium generally holds 3,000 people, but findable records show 7,000 people attended a game in 1961. The stadium received its first renovation in 1985, which added most of the bleachers that are there today. 1985 was also when it hosted a minor league world series game. The stadium is due for another renovation in 2014; however, it is unclear what exactly will be redone with the stadium. Currently the stadium is just used for local games such as high school baseball teams, and the mayor, Greg Goodnight, has stated he doesn't foresee any upcoming teams in Kokomo, although he would like to see one.
Document 13: Canal Park (Akron, Ohio): Canal Park is a baseball stadium located in Akron, Ohio, United States, that is the home of the Akron RubberDucks of the Eastern League. The team is a double-A minor-league affiliate of the Cleveland Indians. Opened in 1997, the stadium was designed by Populous, the same architectural firm that designed the Indians' Jacobs Field, which opened three years earlier. The stadium takes its name from its location adjacent to the Ohio and Erie Canal, which runs behind the left-field wall.
Document 14: Des Moines metropolitan area: The Des Moines metropolitan area, officially known as the Des Moines -- West Des Moines, IA Metropolitan Statistical Area (MSA), consists of five counties in central Iowa, United States: Polk, Dallas, Warren, Madison, and Guthrie. The 2010 census population of these counties was 569,633, and the 2017 estimated population was 645,911.
Document 15: Kalona, Iowa: Kalona is a city in Washington County, Iowa, United States. It is part of the Iowa City, Iowa Metropolitan Statistical Area. The population was 2,363 at the 2010 census. Kalona is the second largest city in Washington County.
ground_truth: Warren County
sub_queries: Principal Park >> owned by Answer: Des Moines
Des Moines >> located in the administrative territorial entity Answer: Warren County