Question: What is the population of the area of Inez Asher's birthplace?

full_context: Document 1: 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 2: 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 3: Tess Slesinger: Tess Slesinger (16 July 1905 – 21 February 1945) was an American writer and screenwriter and a member of the New York intellectual scene.
Document 4: 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 5: 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 6: Ines Cassettari: Ines Cassettari (died 1943) was an Italian emigrant to America whose autobiography became famous. She was born in 1866 or 1867 in Lombardy, Italy, and abandoned at birth, and lived in an orphanage and then a foster home. She was forced to marry an abusive man. They immigrated to the United States, where she refused to run a brothel for him and eventually left him. She remarried and worked as a cleaning woman in the Chicago Commons until she died.
Document 7: 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 8: Inez Asher: Inez Asher (née Inez Harriett Silverberg; January 1, 1911 in Des Moines, Iowa – May 8, 2006 in Yonkers, New York) was a novelist and television writer.
Document 9: Mina P. Shaughnessy: Mina P. Shaughnessy (1924–1978), a miner's daughter, born in the mining town of Lead, South Dakota, was a teacher and innovator in the field of basic writing at the City University of New York (CUNY).
Document 10: Inés Rodena: Inés Rodena (April 20, 1905 in Havana, Cuba – April 15, 1985 in Miami, USA) was a Cuban radio and television writer.
Document 11: Judith Herzberg: Judith Herzberg is the daughter of lawyer and writer Abel Herzberg, and lives alternately in the Netherlands and Israel. She mainly writes poems and plays, and also works on films. Herzberg debuted in 1961 as a poet in the weekly "Vrij Nederland". Two years later, she published her first poetry collection, "Zeepost". She also wrote the plays "Leedvermaak" and "Rijgdraad", both of which were made into films by Frans Weisz.
Document 12: 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 13: 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 14: 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 15: Irène Némirovsky: Irène Némirovsky (; 24 February 1903 – 17 August 1942) was a novelist of Ukrainian Jewish origin born in Kiev Ukraine under the Russian Empire; she lived more than half her life in France, and wrote in French, but was denied French citizenship. Arrested as a Jew under the racial laws – which did not take into account her conversion to Roman Catholicism – she died at Auschwitz at the age of 39. Némirovsky is best known for the posthumously published "Suite française.
ground_truth: 645,911
sub_queries: Inez Asher >> place of birth Answer: Des Moines
what is the population of the Des Moines area Answer: 645,911