Question: What is the population of the area to which KDPS is licensed to broadcast?

full_context: Document 1: Melbourne: A long list of AM and FM radio stations broadcast to greater Melbourne. These include "public" (i.e., state-owned ABC and SBS) and community stations. Many commercial stations are networked-owned: DMG has Nova 100 and Smooth; ARN controls Gold 104.3 and KIIS 101.1; and Southern Cross Austereo runs both Fox and Triple M. Stations from towns in regional Victoria may also be heard (e.g. 93.9 Bay FM, Geelong). Youth alternatives include ABC Triple J and youth run SYN. Triple J, and similarly PBS and Triple R, strive to play under represented music. JOY 94.9 caters for gay, lesbian, bisexual and transgender audiences. For fans of classical music there are 3MBS and ABC Classic FM. Light FM is a contemporary Christian station. AM stations include ABC: 774, Radio National, and News Radio; also Fairfax affiliates 3AW (talk) and Magic (easy listening). For sport fans and enthusiasts there is SEN 1116. Melbourne has many community run stations that serve alternative interests, such as 3CR and 3KND (Indigenous). Many suburbs have low powered community run stations serving local audiences.
Document 2: KDPS: KDPS is a radio station in Des Moines, Iowa. The station is owned by Des Moines Public Schools. The school district programs the station during daytime hours with a variety of rock music styles and staffs it with high school students who are learning radio. Most evenings and on weekends, KDPS is programmed by Grand View University with alternative rock music on weeknights and children's music on weekends, however every Friday is called Hip Hop Friday, as they play hip hop the entire day.
Document 3: WDPS: WDPS (89.5 FM) (for: Dayton Public Schools and its nickname Dayton's Power Source") is a radio station broadcasting a Jazz format. It serves its city of license, Dayton, Ohio, United States. The station is currently owned by Dayton Public Schools. Its programming is aired weekdays during school hours during the curricular school year. The frequency is shared with WQRP which airs a gospel music format when WDPS programming ends after the school day. According to a Dayton Daily News story dated July 21, 2009, the station has moved to new studios located in the David H. Ponitz Career Technology Center at 741 West Washington St. A switch to a "real jazz" format has also taken place.
Document 4: KSTZ: KSTZ (102.5 FM, "Star 102.5") is a commercial FM radio station in Des Moines, Iowa. The station has a Hot Adult Contemporary radio format. KSTZ is part of Saga Communications' Des Moines Radio Group, along with KPSZ, KRNT, KAZR, KIOA, and KMYR, with studios located on Locust Street in Des Moines.
Document 5: KPSZ: KPSZ (940 AM, "Praise 940") is a Christian radio station serving the Des Moines, Iowa, area. The station's studios are located on Locust Street in Des Moines along with Saga Communications' other Des Moines stations (KRNT, KSTZ, KIOA, KMYR and KAZR), while its 8-tower transmitter array is located near Hartford.
Document 6: KYDS: KYDS is a Sacramento, California, radio station with the frequency 91.5. It is maintained at El Camino Fundamental High School and select students from the school are allowed to participate in its operation. "KYDS"'s original inception was in 1976 where it broadcast only to the school cafeteria during lunch hour. "KYDS" originally got its FCC broadcast license in 1978 as one of the last Class "D" licensed FM stations in the country. The station went on the air with 10 watts of power (transmitter power output, not effective radiated power), into a 4-bay antenna and broadcast a monaural signal that effectively covered a 5-mile radius.
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: 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 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: 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 11: 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 12: 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 13: Ann Arbor, Michigan: Four major AM radio stations based in or near Ann Arbor are WAAM 1600, a conservative news and talk station; WLBY 1290, a business news and talk station; WDEO 990, Catholic radio; and WTKA 1050, which is primarily a sports station. The city's FM stations include NPR affiliate WUOM 91.7; country station WWWW 102.9; and adult-alternative station WQKL 107.1. Freeform station WCBN-FM 88.3 is a local community radio/college radio station operated by the students of the University of Michigan featuring noncommercial, eclectic music and public-affairs programming. The city is also served by public and commercial radio broadcasters in Ypsilanti, the Lansing/Jackson area, Detroit, Windsor, and Toledo.
Document 14: 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 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: KDPS >> licensed to broadcast to Answer: Des Moines
what is the population of the Des Moines area Answer: 645,911