Question: What county holds the city where KPSZ is located?

full_context: Document 1: KIPR: KIPR (92.3 FM, "Power 92 Jams") is a commercial radio station carrying an urban contemporary format located in Little Rock, Arkansas and licensed to Pine Bluff. It is owned by Cumulus Media. The station's studios are located in West Little Rock, and the transmitter tower is located in Jefferson, south of Pine Bluff. Due to the transmitter location emitting 100 kilowatts, the signal covers most of Central Arkansas including places like Brinkley, North Little Rock, Gould, Fordyce and Dumas.
Document 2: 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 3: 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 4: 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 5: KPSZ: KPSZ (940 AM, "Praise 940") is a Christian radio station serving the Des Moines, Iowa, area. The station's studios are located on Locust Street in Des Moines along with Saga Communications' other Des Moines stations (KRNT, KSTZ, KIOA, KMYR and KAZR), while its 8-tower transmitter array is located near Hartford.
Document 6: 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 7: KESZ: KESZ (99.9 FM; "KEZ") is an adult contemporary radio station based in Phoenix, Arizona. The station is owned and operated by iHeartMedia. Its studios are located in Phoenix near Sky Harbor Airport and its transmitter is in South Mountain Park.
Document 8: KDPS: KDPS is a radio station in Des Moines, Iowa. The station is owned by Des Moines Public Schools. The school district programs the station during daytime hours with a variety of rock music styles and staffs it with high school students who are learning radio. Most evenings and on weekends, KDPS is programmed by Grand View University with alternative rock music on weeknights and children's music on weekends, however every Friday is called Hip Hop Friday, as they play hip hop the entire day.
Document 9: 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 10: KXIC: KXIC (800 AM) is a radio station licensed to serve Iowa City, Iowa and the greater Johnson County area. The station is owned by iHeartMedia, Inc. and licensed to Citicasters Licenses, Inc. It airs a News/Talk radio format.
Document 11: 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.
Document 12: 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 13: KJJQ: KJJQ's transmitter is located in the town of Volga, South Dakota, but the studios are in the nearby city of Brookings. Known as The Ranch AM 910, the station has a broad range transmitting across eastern South Dakota and western Minnesota, reaching the cities of Yankton, South Dakota, Webster, South Dakota, Chamberlain, South Dakota, Marshall, Minnesota, Olivia, Minnesota, and the communities between these points. The station was formerly in a historic train depot and went by the name "Depot Radio". In 2005, the depot was sold and KJJQ relocated to the building now housing the other four commercial radio stations in Brookings.
Document 14: KSTZ: KSTZ (102.5 FM, "Star 102.5") is a commercial FM radio station in Des Moines, Iowa. The station has a Hot Adult Contemporary radio format. KSTZ is part of Saga Communications' Des Moines Radio Group, along with KPSZ, KRNT, KAZR, KIOA, and KMYR, with studios located on Locust Street in Des Moines.
Document 15: 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.
ground_truth: Warren County
sub_queries: What city is KPSZ located? Answer: Des Moines
Des Moines >> located in the administrative territorial entity Answer: Warren County