"Knoxville" sign found on the north side along IA 14
Location of Knoxville, Iowa
KNOXVILLE IOWA Latitude and Longitude:
|• Total||4.63 sq mi (11.99 km2)|
|• Land||4.63 sq mi (11.99 km2)|
|• Water||0 sq mi (0 km2)|
|Elevation||909 ft (277 m)|
| • Estimate |
|• Density||1,579/sq mi (609.8/km2)|
|Time zone||UTC-6 ( Central (CST))|
|• Summer ( DST)||UTC-5 (CDT)|
50138, 50197, 50198
|GNIS feature ID||0458137|
Knoxville is a city in Marion County, Iowa, United States. The population was 7,313 at the 2010 census, a decrease from 7,731 in the 2000 census. It is the county seat of Marion County.  Knoxville is home of the National Sprint Car Hall of Fame & Museum, located next to the famous Knoxville Raceway dirt track.
The site for the future county seat of Marion County was selected because it was within a mile of the geographic center of the county, reasonably level and near a good source of timber.
Knoxville is located in south-central Iowa, some 25 miles southeast of Des Moines. The area was originally inhabited by Native Americans of the Sac and Fox tribes. At that time, prairie grass covered the countryside at heights of 8 to 10 feet. In 1835, Dragoons first explored the Des Moines River valley through this area. In 1842, the Sac and Fox Indians signed a treaty to sell lands in central Iowa to the new settlers known as the New Purchase of 1842. By 1843, settlers began moving here. The first Marion County Courthouse was erected three years later.
Knoxville was founded in 1845 when Joseph Robinson and James Montgomery, Commissioners from Scott and Wapello County, selected the site for Knoxville and designated it as the county seat. They named Knoxville in honor of General Henry Knox, hero of the Revolutionary War. The City’s main streets are named after Robinson and Montgomery.
County surveyor Isaac B. Powers platted part of the town in September 1845, shortly after it was located. Clairborne Hall laid out the remainder of the town in the winter of 1846-47. Additional surveys were made in December 1849 and September 1852.
The first sale of lots on October 21, 1845 saw the best sites in town go for $15 to $65. The first survey made the streets 80 feet wide, alleys 10 feet wide, and lots 120’ x 60’, but the third survey changed the width of the streets to 50 feet, and made the blocks 265’ x 240’.
The first Marion County courthouse was built on a lot owned by L.C. Corny. Contractor Lewis M. Pearch started work on May 29, 1846 at a cost of approximately $80,000.
Knoxville remained an unincorporated village until 1853, when a movement for incorporation began. A judicial order was issued after an election in which 64 votes were cast in favor of incorporation, with 4 votes against. Knoxville was duly incorporated as a City in 1855.
In early 1853, the citizens of Marion County created a committee to attract railroad development to the county and to Knoxville, promising to buy shares in any railroad that reached town. The first contender was the Muscatine, Oskaloosa & Council Bluffs, proposing an east-west line that would pass through Knoxville, the line being suggested in January 1868 by the proposed Muscatine, Oskaloosa & Council Bluffs.  By 1875, when this line reached Knoxville, it was the Chicago, Burlington & Quincy Railroad. The second railroad to reach Knoxville was the Chicago, Rock Island & Pacific, which completed a line from Oskaloosa in 1876, it being the second railroad to reach Knoxville, the Chicago, Rock Island & Pacific which completed a line from Oskaloosa in 1876. 
Systematic coal mining in Marion County began with the Union Coal Company's mine in Flagler, 4 miles (6.4 km) east of Knoxville in around 1874 or 1875. For several years, the Number 5 mine in Flagler was one of the most productive in Iowa, employing around 150 men and working a coal vein over 8 feet (2.5 m) thick. The Oak Hill coal company also had mines in Flagler.
Shortly after the railroad reached Knoxville, J. T. James opened a coal mine in town just 8 blocks north of the courthouse. This mine continued in operation until 1890. A second mine nearby was operated by W. A. Gamble. In the 1880s, the White Breast Fuel Company opened the Number 11 mine at Flagler. This mine operated in a coal vein that was locally up to 14 feet thick, but only locally. The mine continued operating until 1892, working in progressively thinner coal as it expanded. 
|Iowa Data Center|
As of the census  of 2010, there were 7,313 people, 3,169 households, and 1,925 families residing in the city. The population density was 1,579.5 inhabitants per square mile (609.8/km2). There were 3,527 housing units at an average density of 761.8 per square mile (294.1/km2). The racial makeup of the city was 96.9% White, 1.1% African American, 0.3% Native American, 0.5% Asian, 0.2% from other races, and 1.0% from two or more races. Hispanic or Latino of any race were 1.9% of the population.
There were 3,169 households of which 30.5% had children under the age of 18 living with them, 43.9% were married couples living together, 12.3% had a female householder with no husband present, 4.5% had a male householder with no wife present, and 39.3% were non-families. 34.9% of all households were made up of individuals and 15.7% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.90.
The median age in the city was 41 years. 24.7% of residents were under the age of 18; 7.2% were between the ages of 18 and 24; 22.5% were from 25 to 44; 26.4% were from 45 to 64; and 19.1% were 65 years of age or older. The gender makeup of the city was 48.3% male and 51.7% female.
According to the census  of 2000, there were 7,731 people, 3,191 households, and 1,984 families residing in the city. The population density was 1,746.2 people per square mile (673.8/km²). There were 3,418 housing units at an average density of 772.0 per square mile (297.9/km²). The racial makeup of the city was 97.00% White, 0.88% African American, 0.31% Native American, 0.52% Asian, 0.06% Pacific Islander, 0.28% from other races, and 0.94% from two or more races. 0.83% of the population were Hispanics or Latinos of any race.
There were 3,191 households out of which 30.0% had children under the age of 18 living with them, 48.7% were married couples living together, 10.2% had a female householder with no husband present, and 37.8% were non-families. 33.4% of all households were made up of individuals and 15.1% had someone living alone who was 65 years of age or older. The average household size was 2.28 and the average family size was 2.92.
Age spread: 23.9% under the age of 18, 7.8% from 18 to 24, 26.5% from 25 to 44, 22.2% from 45 to 64, and 19.6% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 98.6 males. For every 100 females age 18 and over, there were 95.6 males.
The median income for a household in the city was $34,055, and the median income for a family was $44,078. Males had a median income of $34,832 versus $21,593 for females. The per capita income for the city was $17,893. About 9.6% of families and 11.1% of the population were below the poverty line, including 16.1% of those under age 18 and 8.9% of those age 65 or over.
Knoxille is located in the South central portion of the State.Knoxville is located 2 miles (3.2 km) east of White Breast Creek and 6 miles southwest of the confluence of White Breast Creek and the Des Moines River in Lake Red Rock, at (41.319096, -93.101509). 
- Robert L. Burns — Los Angeles, California, City Council member, 1929–45, born in Knoxville
- James Fee — Photographer.
- Dixie Cornell Gebhardt — Designer of the Flag of Iowa (and 1st cousin of Henry Carroll Timmonds, below)
- Joseph P. Graw - Minnesota state representative and businessman
- Edward R. Hays — U.S. congressman, 1890-1891.
- James Mathews — U.S. congressman (from Ohio), 1841–1843; professor at Iowa State College.
- Howard B. Myers — Economist
- Frank Steunenberg — Governor of Idaho (1897–1901), assassinated in 1905.
- William M. Stone — Governor of Iowa (1864–1868)
- William Corwin Stuart - Served as both a Federal Judge and an Iowa Supreme Court Judge
- Henry Carroll Timmonds — Missouri state representative and judge in late 1800s
- "US Gazetteer files 2010". United States Census Bureau. Archived from the original on 2012-07-14. Retrieved 2012-05-11.
- "American FactFinder". United States Census Bureau. Retrieved 2012-05-11.
- "Population and Housing Unit Estimates". Retrieved June 9, 2017.
- "Find a County". National Association of Counties. Archived from the original on 2011-05-31. Retrieved 2011-06-07.
-  I & W Railroad History, accessed January 2017
- pages 235-238.
- John W. Wright and W. A Young, History of Marion County Iowa and its People, S. J. Clarke, Chicago, 1915; page 253-254.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
|Wikimedia Commons has media related to Knoxville, Iowa.|
- Knoxville Journal Express Weekly newspaper in Knoxville
- KNIA/KRLS AM/FM radio station with local news
- Knoxville Chamber of Commerce Listing of area businesses and an up-to-date calendar of community events
- Peace Tree Brewing Company Award-winning microbrewery located just west of Downtown Knoxville
- Red Rock Area Tourism Sights, attractions, and points of interest in the Red Rock area
- Weiler Products Homegrown industry, and a major up-and-coming employer in the area
- City Data Comprehensive Statistical Data and more about Knoxville
- New International Encyclopedia. 1905. .