New Madrid County, Missouri (English Wikipedia)

Eaton, David Wolfe (1917). How Missouri Counties, Towns and Streams Were Named. The State Historical Society of Missouri. p. 335.
Shoemaker, F.C.; State Historical Society of Missouri (1917). Missouri Historical Review. State Historical Society of Missouri. ISSN 0026-6582.

census.gov

"2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Archived from the original on October 21, 2013. Retrieved November 17, 2014.
"U.S. Decennial Census". United States Census Bureau. Retrieved November 17, 2014.
"Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved November 17, 2014.
"Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Archived (PDF) from the original on March 27, 2010. Retrieved November 17, 2014.
"Population and Housing Unit Estimates". Retrieved November 15, 2019.
"U.S. Census website". United States Census Bureau. Retrieved January 31, 2008.

"State & County QuickFacts". United States Census Bureau. Archived from the original on June 7, 2011. Retrieved September 12, 2013.

Breeding, Marshall. "Lilbourn Memorial Library". Libraries.org. Retrieved May 8, 2017.
Breeding, Marshall. "New Madrid County Library". Libraries.org. Retrieved May 8, 2017.

Bock/St, Jill; Democrat, ard (March 1, 2022). "Filing opens to fill New Madrid County and state offices". Sikeston Standard Democrat.

"Madrid de Sol a Sol: New Madrid, Estados Unidos". Telemadrid – Radio Televisión Madrid. August 7, 2017. Retrieved August 16, 2017.

Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved March 25, 2018.

"Historical Census Browser". University of Virginia Library. Retrieved November 17, 2014.

"2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Archived from the original on October 21, 2013. Retrieved November 17, 2014.
"Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Archived (PDF) from the original on March 27, 2010. Retrieved November 17, 2014.
"State & County QuickFacts". United States Census Bureau. Archived from the original on June 7, 2011. Retrieved September 12, 2013.

Shoemaker, F.C.; State Historical Society of Missouri (1917). Missouri Historical Review. State Historical Society of Missouri. ISSN 0026-6582.