With the exception of the Meramec River, on which it borders, Kirkwood contains no major bodies of water; water mostly drains into either the Meramec or the River Des Peres to the east. Local terrain is mostly flat, with the exception of some low hills west of Interstate 270. The city has a total area of 9.20 square miles, and an average elevation of 659 feet.<ref>https://web.archive.org/web/20120125061959/http://www.census.gov/geo/www/gazetteer/files/Gaz_places_national.txt</ref>
==Demographics==
At the 2010 census, Kirkwood had a total of 27,540 inhabitants, grouped into 11,894 households, with a population density of 2,994.8 people per square mile. This figure was practically unchanged from the 2000 census, when Kirkwood had a population of 27,324. 89.45% of the inhabitants were White, 7.00% were African-American, 0.13% were Native American, 1.43% were Asian, 0.02% were Native Hawaiian or Pacific Islander, 0.42% were from some other race, and 1.55% were from two or more races. Hispanics of any race were 1.84% of the population.
The median age in Kirkwood was 42.6 years, with 23.2% of inhabitants under the age of 18, 6.1% between 18 and 24 years old, 23.8% between 25 and 44, 29.9% between 45 and 64, and 17.1% 65 years old or older. The sex ratio was 46.0% male, 54.0% female.<ref>https://mcdc.missouri.edu/applications/census2010/report.php?g=16000US2939044|04000US29</ref>
According to the 2018 American Community Survey, Kirkwood had a median household income of $88,378, and a median family income of $120,943. The unemployment rate was 2.5%. The per capita income was $50,828. About 4.5% of the population lived below the poverty line, including 3.3% of those under the age of 18 and 5.8% of those 65 years of age or older.<ref>https://data.census.gov/cedsci/table?g=0400000US29_1600000US2939044&d=ACS%205-Year%20Estimates%20Data%20Profiles&tid=ACSDP5Y2018.DP03</ref>
==References==