Question: What is the population of the city where Matt Bobo was born?

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: 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 3: 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 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: Matt Macri: Matthew Michael Macri (born May 29, 1982 in Des Moines, Iowa) is a Major League Baseball player who plays third base.
Document 6: Bob Mattick: Mattick, a 6'11 center from Chicago, played for Oklahoma A&M from 1951–54. Mattick was a star for the Aggies and one of the premier big men in college basketball his last two seasons. Mattick was named All-Missouri Valley Conference both years, and led the Aggies to two NCAA Tournament bids in 1953 and 1954. As a senior, Bob Mattick became the first player in Oklahoma A&M (now called Oklahoma State) history to average more than 20 points per game (20.7) and the first to average a double-double (20.7 points, 11.2 rebounds per game). He was named a consensus second team All-American that year. He finished with 1,378 points (16.6 per game) and 772 rebounds (9.3 per game) for his three-year career.
Document 7: Nathan Bourdeau: Nathan "Nate" Bourdeau (born August 10, 1990 in Baldwinsville, NY) is a professional American soccer player who currently plays for Utica City FC in the Major Arena Soccer League and Syracuse FC of the National Premier Soccer League.
Document 8: 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 9: Matt Ryan (American football): Matthew Thomas Ryan (born May 17, 1985), nicknamed ``Matty Ice '', is an American football quarterback for the Atlanta Falcons of the National Football League (NFL). After playing college football for Boston College, Ryan was drafted by the Falcons with the third overall pick in the first round of the 2008 NFL Draft.
Document 10: Matt Bobo: Matthew "Matt" Bobo (born January 6, 1977 in Des Moines, Iowa) is an American soccer player who last played for Carolina RailHawks in the North American Soccer League.
Document 11: List of foreign Premier League goalscorers: Jozy Altidore -- Hull City, Sunderland DaMarcus Beasley -- Manchester City Carlos Bocanegra -- Fulham Geoff Cameron -- Stoke City Jay DeMerit -- Watford Clint Dempsey -- Fulham, Tottenham Hotspur (57) Landon Donovan -- Everton Brad Friedel -- Blackburn Rovers John Harkes -- Sheffield Wednesday Stuart Holden -- Bolton Wanderers Tim Howard -- Everton Cobi Jones -- Coventry City Jovan Kirovski -- Birmingham City Eric Lichaj -- Aston Villa Brian McBride -- Everton, Fulham Joe - Max Moore -- Everton Preki -- Everton Claudio Reyna -- Sunderland, Manchester City Jonathan Spector -- West Ham United Roy Wegerle -- Blackburn Rovers, Coventry City
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: Matt Snider: Matthew "Matt" Kale Snider (born on January 26, 1976, in Des Moines, Iowa) is a former American football fullback from the University of Richmond. He graduated in 1999 with a Bachelor of Arts degree in Sports Science and Health. The Carolina Panthers offered him an NFL free agent contract in the spring of 1999. He spent the summer in Charlotte and went through three mini-camps with the club, but they released him after the third. The Green Bay Packers then offered him a two-year contract in July 1999, and Snider made the roster as the back-up fullback and special teams performer after coming into camp as the fourth-string fullback. One highlight of his career at Green Bay was a 66-yard touchdown reception at Lambeau Field.
Document 14: Bobo Brazil: Houston Harris (July 10, 1924 – January 20, 1998) was an American professional wrestler, better known by his ring name Bobo Brazil. Credited with breaking down barriers of racial segregation in professional wrestling, Harris is considered one of the first successful African-American professional wrestlers.
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: Matt Bobo >> place of birth Answer: Des Moines
what is the population of the Des Moines area Answer: 645,911