Ogle County, Illinois

Founding: 1836
Parent counties: Jo Daviess and unorganized territory

Namesake: Joseph Ogle, Illinois frontiersman
Seat: Oregon (1837–)

Land area: 759 square miles

Population (2020): 51,788

Population (historic): 3,479 (1840); 22,888 (1860); 29,937 (1880); 29,129 (1900); 28,118 (1930)

Periods of population growth: pre-1840–1880; 1890s; 1920–1980; 1990–2010

Subdivisions: Four cities; nine villages; two CDPs; 24 townships

National Register listings: 28

Pre-1940 residences (estimated): 5,944 (26.2%)
Pre-1940 housing survival rate: 67.1%
Pre-1860 housing survival rate (1940): 16.2%

Farm housing in disrepair (1950): 4.5%

Nonfarm housing in disrepair (1950): 4.7%

Average farmhouse value (1930): $2,301
Average outbuilding value (1930): $3,268

Average farmhouse size (1940): 7.5 rooms
Number of farms (1920): 2,784
Average farm size (1920): 137.4 acres
Sources of settlement: Pennsylvania, New York, Maryland, Germany, Ohio, Ireland, and Canada
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Oregon

Namesake: The Oregon Territory

Founding: 1836 (platting); 1837 (post office); 1843 (incorporation)

Population (2020): 3,604

Population (historic): 1,088 (1880); 1,577 (1900); 2,376 (1930)

Periods of population growth: pre-1880–1960; 1970–2000
Pre-1940 residences (estimated): 570 (30.2%)
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Outstanding Buildings

1. *David Hoffhein House Ruins (c. 1860). 4801 Brookville Road. Brookville.
2. *Hiram Gitchel Farm (c. 1855). 479 Oak Grove Road. Byron. Greek Revival.
3. *William Moats Farm (1844). 4975 Wood Road. Lafayette.
4. Peter Good Farm (c. 1875). 2784 Summer Hill Road. Lincoln. Italianate.
5. *West Branch Brethren Church (1862). 4014 West Branch Road. Lincoln. Greek Revival.
6. Ernest Gesin House (c. 1870). 9760 State Route 72. Maryland. Italianate.
7. Henry Buterbaugh Farm (c. 1870). 6468 Leaf River Road. Mount Morris. Italianate.
8. *Samuel Hitt Farm (1858). 7782 State Route 64. Mount Morris. Italianate.
9. *Chana School (1883). 201 River Road. Oregon.
10. House (c. 1885). 6988 Brick Road. Pine Rock. Eastlake.
11. *John Hayes House (c. 1860). 2307 White Rock Road. White Rock. Italianate.