Question: What is the current population of Monrad Wallgren's birth city?

full_context: Document 1: Erik W. G. Leidzén: He was born into a Salvation Army family in Stockholm, Sweden on Easter Sunday, March 25, 1894. He took up the E-flat flugelhorn at age 6, and attended the Royal Swedish Academy of Music, graduating with honors in 1914. He emigrated to the United States in 1915, and continued his association with Salvation Army music there.
Document 2: Des Moines, Iowa: Age spread: 24.8% under the age of 18, 10.6% from 18 to 24, 31.8% from 25 to 44, 20.4% from 45 to 64, and 12.4% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 93.8 males. For every 100 females age 18 and over, there were 90.5 males.
Document 3: Gordon Glisson: Born in Winnsboro, South Carolina, at age fifteen he and his mother moved to Seattle, Washington. He began working at the Longacres Racetrack in nearby Renton, Washington then as an apprentice jockey rode in his first race at the Ak-Sar-Ben Racetrack in Omaha, Nebraska. In 1948, younger brother John Weldon Glisson would also become a jockey.
Document 4: Johnston, Iowa: Johnston is a city in Polk County, Iowa, United States. The population was 17,278 in the 2010 census, an increase of almost 100% from the 8,649 population in the 2000 census. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area.
Document 5: 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 6: Cedar Rapids, Iowa: As of the 2010 United States Census, the city population was 126,326. The estimated population of the three - county Metropolitan Statistical Area, which includes the nearby cities of Marion and Hiawatha, was 255,452 in 2008. Cedar Rapids is an economic hub of the state, located in the core of the Interstate 380.
Document 7: Franklin B. Ware: He was born in New York City in 1873, and received a degree in architecture from Columbia University in 1894. He entered practice with his father and brother in 1900 under the name James E. Ware and Sons. From 1901 to 1905, he was on the New York City Board of Aldermen. From 1907 to 1912, he served as State architect of New York. His father died in 1918, and he continued in practice with his brother. In addition to designing the White Plains Armory while State architect, in private practice his partnership designed the Huntington Gymnasium at Colgate University; Baggs Park Museum and Grace Church at Utica, New York; United States Post Office at Ossining, New York; buildings at Marymount University, Tarrytown, New York; the Grant Avenue Presbyterian Church, Plainfield, New Jersey; and a number of private residences in New York and New Jersey. While in practice with his father, they designed City and Suburban Homes Company's First Avenue Estate Historic District, added to the National Register of Historic Places in 1986.
Document 8: 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 9: Des Moines, Iowa: On September 22, 1851, Des Moines was incorporated as a city; the charter was approved by voters on October 18. In 1857, the name ``Fort Des Moines ''was shortened to`` Des Moines'', and it was designated as the second state capital, previously at Iowa City. Growth was slow during the Civil War period, but the city exploded in size and importance after a railroad link was completed in 1866.
Document 10: Wallace Townsend: Townsend was born in DeWitt in Clinton County in easternmost Iowa, a son of John R. Townsend and the former Italia James. In 1894, Townsend moved with his family to the capital city of Little Rock, where his brother, A. E. "Jack" Townsend, was the long-term assistant postmaster. In 1902, Wallace Townsend obtained a Bachelor of Arts degree from Hendrix College in Conway, Arkansas, and became an educator for eight years. From 1906 to 1910, he was principal of Little Rock High School, in which capacity he obtained the first accreditation of the institution.
Document 11: William F. Double: Born in Milwaukee, Wisconsin, Double went to Ripon College, Marquette University, and received his law degree from Marquette University Law School. Double served in the Wisconsin National Guard and the Temporary Coast Guard Reserve. Double practiced law, worked as a lobbyist, and was involved with the banking business. Double served in the Wisconsin State Assembly from 1939 to 1944 and was a Republican. Double died in Mequon, Wisconsin.
Document 12: Monrad Wallgren: Wallgren, of Swedish descent, was born in Des Moines, Iowa in 1891. His family moved to Texas in 1894 and then to Everett, Washington in 1901. He attended public schools and business college in Everett, graduating from the Washington State School of Optometry in Spokane, Washington in 1914. He worked in retail jewelry and optometry from 1915 to 1932, as well as serving in the Washington National Guard from 1917 to 1919 and 1921 to 1922. He was an outstanding player of three-cushion billiards and balkline and straight rail billiards.
Document 13: Deane Waldo Malott: The son of a banker, Malott was born in Abilene, Kansas and went on to study at the University of Kansas. While at school there, he wrote for the "University Daily Kansan" and was a brother in the Alpha Nu Chapter of the Beta Theta Pi fraternity and the Alpha Kappa Psi business fraternity. He graduated in 1921 with a degree in economics, and he went on to the Harvard Business School. After his 1923 graduation, he worked as an administrator at Harvard until 1929 when he was hired by the Hawaiian Pineapple Company. He returned to Harvard in 1933 as a Professor and then in 1939 he returned to his alma mater to become Chancellor of University of Kansas. While serving as Chancellor of the university, he helped oversee the transition of a peacetime campus to a wartime one, and enabled KU to train thousands of military personnel.
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: 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.
ground_truth: 645,911
sub_queries: Monrad Wallgren >> place of birth Answer: Des Moines
what is the population of the Des Moines area Answer: 645,911