Question: What is the population of the city where Lanny Morgan was born?

full_context: Document 1: The Al Morgan Show: The Al Morgan Show is an American variety program broadcast on the DuMont Television Network from 1949 to 1951. The series starred pianist and songwriter Al Morgan (1915-1989).
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: 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 4: Candy (Lee Morgan album): Candy is an album by jazz trumpeter Lee Morgan released on the Blue Note label in 1958, featuring performances by Morgan, Sonny Clark, Doug Watkins and Art Taylor.
Document 5: Allen Eager: Allen Eager (January 10, 1927 – April 13, 2003) was an American jazz tenor and alto saxophonist who also competed in auto racing and took part in LSD experiments.
Document 6: Lanny Morgan: Lanny Morgan (born March 30, 1934, Des Moines, Iowa) is an American jazz alto saxophonist chiefly active on the West Coast jazz scene.
Document 7: 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 8: Infinity (Lee Morgan album): Infinity is an album by jazz trumpeter Lee Morgan released on the Blue Note label. It was recorded on November 16, 1965 but not released until 1981 and features performances by Morgan with a quintet featuring Jackie McLean, Larry Willis, Reggie Workman and Billy Higgins. The album was reissued on CD in 1998 as a limited edition.
Document 9: 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 10: 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 11: 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 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: 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 14: Bass clarinet: The first jazz album on which the leader solely played bass clarinet was Great Ideas of Western Mann (1957) by Herbie Mann, better known as a flautist. However, avant - garde musician Eric Dolphy (1928 -- 1964) was the first major jazz soloist on the instrument, and established much of the vocabulary and technique used by later performers. He used the entire range of the instrument in his solos. Bennie Maupin emerged in the late 1960s as a primary player of the instrument, playing on Miles Davis's seminal record Bitches Brew as well as several records with Herbie Hancock's Mwandishi group. His style resembles Dolphy's in its use of advanced harmonies.
Document 15: The Cooker: The Cooker is an album by the jazz trumpeter Lee Morgan, released on the Blue Note label in 1958 as BLP 1578. It was recorded on September 29, 1957, and features a quintet with Morgan, Pepper Adams, Bobby Timmons, Paul Chambers and Philly Joe Jones.
ground_truth: 645,911
sub_queries: Lanny Morgan >> place of birth Answer: Des Moines
what is the population of the Des Moines area Answer: 645,911