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; 

National Register listings: 182 (and 435 in St. Louis proper)

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

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