Question: In which county was Nikki Ziegelmeyer born?

full_context: Document 1: A Girl Named Zippy: A Girl Named Zippy is a memoir by Haven Kimmel. This memoir describes the childhood of the author who grew up in the 1960s in the small town of Mooreland, Indiana. The title is taken from the author's nickname "Zippy" which her father gave her to describe her zipping around the house.
Document 2: St. Charles, Missouri: St. Charles is a city in, and the county seat of, St. Charles County, Missouri, United States. The population was 65,794 at the 2010 census, making St. Charles the ninth - largest city in Missouri. It lies to the northwest, and is a suburb of St. Louis, Missouri on the Missouri River.
Document 3: Natasha Kaiser-Brown: Kaiser-Brown was born in Des Moines, Iowa. In high school, she was a nine-time state champion for Des Moines Roosevelt and is the previous record-holder for the 100 meter and sprint medley relay events (both broken in the 2018 track season).
Document 4: Nikki Ziegelmeyer: She was born in Imperial, Missouri and is a 1993 graduate of Windsor Senior High becoming a Hall of Fame inductee in 2006.
Document 5: Imperial, Missouri: Imperial is a census-designated place (CDP) in Jefferson County, Missouri, United States. The population was 4,709 at the 2010 census, up from 4,373 in 2000. It was originally known as West Kimmswick, and is located south of downtown St. Louis. St. John's Church is a historic parish church located within Imperial.
Document 6: St. Louis: St. Louis (/ seɪnt ˈluːɪs /) is an independent city and major U.S. port in the state of Missouri, built along the western bank of the Mississippi River, on the border with Illinois. The city had an estimated 2016 population of 311,404, and is the cultural and economic center of the Greater St. Louis area (home to 2,916,447 people), making it the largest metropolitan area in Missouri and the 19th - largest in the United States.
Document 7: Niki Wories: Niki Wories was born on 18 June 1996 in Almere, Netherlands. She is the second daughter of Annelies and Paul Wories. She studied at the Johan Cruyff Academy before moving to Quebec, Canada.
Document 8: Empire, California: Empire is a census-designated place (CDP) in Stanislaus County, California, United States. The population was 4,189 at the 2010 census, up from 3,903 at the 2000 census. It is part of the Modesto Metropolitan Statistical Area. Influenced by the Mexican culture, Empire is agriculturally active, and is home to the new Empire Community Park.
Document 9: Herman Keiser: Keiser was born and raised in Springfield, Missouri. Like most professional golfers of his generation, he earned a living primarily as a club professional. His first job was as the assistant golf professional at Portage Country Club in Akron, Ohio. He eventually became head professional at Firestone Country Club in Akron, Ohio. Keiser's serious demeanor earned him the nickname, "The Missouri Mortician", among his fellow golfers.
Document 10: Crystal City, Missouri: Crystal City is a city in Jefferson County, Missouri, United States. The population was 4,855 at the 2010 census. It was 4,247 at the 2000 census.
Document 11: Unity Village, Missouri: Unity Village is a village in Jackson County, Missouri, United States. The population was 99 at the 2010 census. The village is the world headquarters of Unity Church, which has over 2 million followers. The Unity Tower was designed by the Kansas City firm Boillot & Lauck and built in 1929 to store water.
Document 12: Missouri: Well - known Missourians include U.S. President Harry S. Truman, Mark Twain, Walt Disney, Chuck Berry and Nelly. Some of the largest companies based in the state include Cerner, Express Scripts, Monsanto, Emerson Electric, Edward Jones, H&R Block, Wells Fargo Advisors and O'Reilly Auto Parts. Missouri has been called the ``Mother of the West ''and the`` Cave State''; however, Missouri's most famous nickname is the ``Show Me State '', as Missourians are known for being skeptical.
Document 13: Dorothy Jeakins: Born in San Diego, California, she went to public school in Los Angeles from first grade through high school. When she was a senior at Fairfax High School, she was offered a scholarship to study at the Otis Art Institute (now known as Otis College of Art and Design). She was later awarded an Honorary Doctorate from Otis College in 1987.
Document 14: Clayton, Missouri: Clayton is a city in and the county seat of St. Louis County, Missouri, United States, and borders the city of St. Louis. The population was 15,939 at the 2010 census. The city was organized in 1877 and is named after Ralph Clayton, who donated the land for the courthouse. The city is known for its multiple skyscrapers in its business district.
Document 15: Mike Nicolette: Nicolette was born in Pittsburgh, Pennsylvania. He attended Rollins College in Winter Park, Florida and was a member of the golf team. While a student at Rollins, he won the 1976 NCAA Division II Men's Golf Championship. He turned pro in 1978.
ground_truth: Jefferson County
sub_queries: Nikki Ziegelmeyer >> place of birth Answer: Imperial
Imperial >> located in the administrative territorial entity Answer: Jefferson County