St. Louis County, Missouri

Founding: 1812
Parent county: Unorganized territory

Namesake: The city of St. Louis
Seat: St. Louis (1812–1877); Clayton (1877–)

Land area: 508 square miles

Population (2020): 1,004,125

Population (historic): 10,049 (1820); 104,978 (1850); 351,189 (1870); 50,040 (1900); 211,593 (1930)

Periods of population growth: pre-1820–1870; 1880–1970

Subdivisions: 70 cities; 18 villages; ten CDPs

Pre-1940 residences (estimated): 42,830 (9.7%)
Pre-1940 housing survival rate: 52.6%
Pre-1860 housing survival rate (1940): 15.2%

Farm housing in disrepair (1950): 5.8%

Nonfarm housing in disrepair (1950): 9.5%

Average farmhouse value (1930): $2,767
Average outbuilding value (1930): $1,778

Average farmhouse size (1940): 5 rooms
Number of farms (1920): 3,735
Average farm size (1920): 47.5 acres

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St. Louis (ex-seat)

Namesake: King Louis IX of France

Founding: 1764 (founding); 1804 (post office); 1822 (incorporation)

Population (2020): 301,578

Population (historic): 1,600 (1810); 16,469 (1840); 310,864 (1870); 575,238 (1900); 821,960 (1930)

Periods of population growth: pre-1810–1920
Pre-1940 residences (estimated): 99,367 (56.4%)

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Clayton

Namesake: Ralph Clayton, owner of the city site

Founding: 1877 (platting); 1885 (post office); 1913 (incorporation)

Population (2020): 17,355

Population (historic): 402 (1890); 3,028 (1920); 9,613 (1930)

Periods of population growth: 1877–1950; 2000s
Pre-1940 residences (estimated): 2,889 (46.3%)

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Outstanding Buildings

Alexander Stuart Log House (c. 1820). 500 Brookes Drive. Airport.
Conrad Hoppenberg House (c. 1867/1874). 526 Eatherton Road. Chesterfield.
Thornhill / Frederick Bates Farm (c. 1820). 15185 Olive Boulevard. Chesterfield. Classical Revival.
Valentine Kroenung House (c. 1865). 18620 Olive Street Road. Chesterfield. Greek Revival. Razed.
William Tyler House (c. 1837). 337 State Route 109. Chesterfield. Federal.
Samuel Stuart Log House (c. 1820). 2261 Valley Road. Chesterfield. Razed.
James Marshall House (1841). 2800 South McKnight Road. Clayton.
Joseph Sappington Log House (c. 1816). 10734 Clearwater Drive. Concord.
Wildwood / Ellen LaMotte House (1857). 40 Dames Court. Ferguson. Italianate.
Taille de Noyer / Deshetres–Mullanphy House (c. 1800/1830/1922). 1896 New Florissant Road. Ferguson.
John Myers House (1867–1870). 180 Dunn Road. Florissant. Italianate.
Oakland / Louis Benoist House (c. 1854). 7801 Genesta Street. Gravois. Italianate.
White Haven / William Long House (1808). 7400 Grant Road. Gravois. Federal.
Zephaniah Sappington House (c. 1815). 11145 Gravois Road. Gravois. Razed.
Thomas Sappington House (1808). 1015 Sappington Road. Gravois.
William McPherson House (1859). 115 Edwin Avenue. Jefferson.
Christopher Hawken House (1857). 1155 South Rock Hill Road. Jefferson. Greek Revival/Italianate.
St. Stanislaus Seminary (c. 1840). 700 Howdershell Road. Lewis and Clark. Greek Revival.
Jarville / Hyacinth Renard House (c. 1854/1924). 1721 South Mason Road. Missouri River. Greek Revival.
Wilson Hunt House (1906). 7717 Natural Bridge Road. Normandy. Classical Revival.
Mitzpah Presbyterian Church (1869). 11339 St. Charles Rock Road. Northwest. Romanesque.
James Willoughby House (c. 1860). 12380 St. Charles Rock Road. Northwest. Italianate. Razed.
Daniel Bissell House (c. 1820). 10225 Bellefontaine Road. St. Ferdinand. Greek Revival.
Bellefontaine Methodist Church (c. 1850/1926). 10600 Bellefontaine Road. St. Ferdinand. Romanesque.
Wilson Larimore House (1858). 11475 Lilac Avenue. St. Ferdinand. Italianate.
August Kassebaum House (1907). 5009 LeMay Ferry Road. Tesson Ferry. Classical Revival.