Question: What is the population of the area where To My Surprise was formed?

full_context: Document 1: Great Big Mouth Records: Great Big Mouth Records is a record label based in Des Moines, Iowa, which was founded by Slipknot and Stone Sour frontman Corey Taylor and Denny Harvey. The label was conceived to help bring attention to Midwestern bands, Taylor explains; "basically we're just trying to unify the scene and really bring more attention to the Midwest than there is right now.".
Document 2: Jonathan Davis and the SFA: Jonathan Davis and the SFA went on their first tour in the United States in November 2007, and a European tour in May 2008. Their debut album was planned for a release sometime in 2011 and a North American tour was expected to follow. Jonathan Davis and the SFA have a CD/DVD combo available at Invisible Arts. Jonathan's bodyguard and assistant Loc came up with the name of the band. The band has recently used their official website and a Ustream webcast to preview several demos from their upcoming album. Working titles include "Basic Needs", "Medicate", "Happiness", " Final Days", "Russia", "August 12", and "Gender", which was previously said to have been inspired by Buffalo Bill and "Silence of the Lambs". The band has also recorded 3 other untitled demos.
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: Avenged Sevenfold: Before the release of their debut album, the band recorded two demos in 1999 and 2000. In mid-2001, it was reported that Meacham had attempted suicide by drinking excessive amounts of cough syrup. The attempt affected the band's Take Action Tour. During his hospitalization he remained in poor condition and was replaced by Dameon Ash. In an interview, lead singer M. Shadows said of Meacham that ``he perma - fried his brain and was in a mental institution for a long time, and when you have someone in your band who does that, it ruins everything that's going on all around you, and it makes you want to do something to prevent it from happening to other people. ''Avenged Sevenfold's debut album, Sounding the Seventh Trumpet, was recorded when the band members were in their late teens and still in high school. It was originally released on their first label, Good Life Recordings in 2001. When lead guitarist Synyster Gates joined the band after the album was released, the introductory track`` To End the Rapture'' was re-recorded featuring a full band element. The album was subsequently re-released on Hopeless Records in 2002. The band started to receive recognition, performing with bands such as Mushroomhead and Shadows Fall and playing on the Take Action Tour.
Document 6: 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 7: Staind: Staind (/ steɪnd / STAYND) is an American rock band formed in 1995. The original lineup consisted of lead vocalist and rhythm guitarist Aaron Lewis, lead guitarist Mike Mushok, bassist and backing vocalist Johnny April, and drummer Jon Wysocki. The lineup has been stable outside of Wysocki's departure in 2011, who was replaced by Sal Giancarelli. The band has recorded seven studio albums: Tormented (1996), Dysfunction (1999), Break the Cycle (2001), 14 Shades of Grey (2003), Chapter V (2005), The Illusion of Progress (2008), and Staind (2011). The band's activity became more sporadic after their self - titled release; with Lewis pursuing a solo country music career and Mushok subsequently joining the band Saint Asonia, but the band continued to tour off and on in the coming years. As of 2016, Lewis had reiterated that the band has not broken up, and will possibly create another album, but that his current focus is his solo career. The band's most recently performed live in 2017, and as of 2018, is in a hiatus. The band has sold over 15 million records worldwide. Many of the band's singles have substantially charted on US rock and all - format charts as well, including ``It's Been Awhile '',`` Fade'', ``Price to Play '',`` So Far Away'', and ``Right Here ''.
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: 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: Further Seems Forever: Further Seems Forever is an American rock band formed in 1998 in Pompano Beach, Florida. Over its initial eight-year run the band experienced several lineup changes, resulting in a different lead vocalist performing on each of their first three studio albums. Original singer Chris Carrabba recorded "The Moon Is Down" (2001) with the group before leaving to start Dashboard Confessional. He was replaced by Jason Gleason, who performed on "How to Start a Fire" (2003) but left the band the following year. Former Sense Field vocalist Jon Bunch joined Further Seems Forever for "Hide Nothing" (2004). The band broke up in 2006 but reunited four years later with Carrabba on vocals. Their fourth studio album, "Penny Black", was released in 2012.
Document 11: 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 12: Two Door Cinema Club: Trimble, Halliday and Baird formed another band shortly after the demise of their first musical project; on this occasion, a permanent drummer was not included. An interim drummer by the name of Owen Bullington was appointed but was kicked out due to creative differences. The new band's name was taken from Halliday's mispronunciation of the name of the local cinema, the Tudor Cinema; in 2007, Two Door Cinema Club was formed. Following an increased interest in the band's social network page, the three members forewent their university places and commenced work on studio material.
Document 13: To My Surprise: To My Surprise was an American experimental rock band formed in 2002 in Des Moines, Iowa. They are referred to as a side project of Shawn Crahan, a member/founder of heavy metal band Slipknot. In 2003 they released their debut album "To My Surprise", however after losing frontman Brandon Darner in 2004 they parted ways with their record label. 2005 saw four new members join the band to begin work on a second album and in 2006 they began performing shows in the US. However, shortly after To My Surprise canceled several upcoming appearances and disbanded without releasing a second album.
Document 14: 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 15: Hard rock: Although Foo Fighters continued to be one of the most successful rock acts, with albums like In Your Honor (2005) reaching number two in the US and UK, many of the first wave of post-grunge bands began to fade in popularity. Acts like Creed, Staind, Puddle of Mudd and Nickelback took the genre into the 2000s with considerable commercial success, abandoning most of the angst and anger of the original movement for more conventional anthems, narratives and romantic songs. They were followed in this vein by new acts including Shinedown and Seether. Acts with more conventional hard rock sounds included Andrew W.K., Beautiful Creatures and Buckcherry, whose breakthrough album 15 (2006) went platinum and spawned the single "Sorry" (2007), which made the Top 10 of the Billboard 100. These were joined by bands with hard rock leanings that emerged in the mid-2000s from the garage rock or post punk revival, including Black Rebel Motorcycle Club and Kings of Leon, and Queens of the Stone Age from the US, Three Days Grace from Canada, Jet from Australia and The Datsuns from New Zealand. In 2009 Them Crooked Vultures, a supergroup that brought together Foo Fighters' Dave Grohl, Queens of the Stone Age's Josh Homme and Led Zeppelin bass player John Paul Jones attracted attention as a live act and released a self-titled debut album that reached the top 20 in the US and UK and the top ten in several other countries.
ground_truth: 645,911
sub_queries: To My Surprise >> location of formation Answer: Des Moines
what is the population of the Des Moines area Answer: 645,911