Adams County, Indiana

Founding: 1836 (declared in 1835)
Parent county: Unorganized territory

Namesake: John Quincy Adams, U.S. president
Seat: Decatur (1836–)

Land area: 339 square miles

Population (2020): 35,809

Population (historic): 2,264 (1840); 9,252 (1860); 20,181 (1890); 19,957 (1930)

Periods of population growth: pre-1840–1900; 1930–2020

Subdivisions: Four cities; 12 townships

National Register listings: 10

Pre-1940 residences (estimated): 4,201 (31.8%)
Pre-1940 housing survival rate: 68.1%
Pre-1860 housing survival rate (1940): 4.2%

Farm housing in disrepair (1950): 8.8%

Nonfarm housing in disrepair (1950): 4.8%
Average farmhouse value (1930): $1,514
Average outbuilding value (1930): $1,548

Average farmhouse size (1940): 7 rooms
Number of farms (1920): 2,328
Average farm size (1920): 78 acres
Sources of settlement: Ohio, Germany, Pennsylvania, and Switzerland

_________________________________________________________________________________

Decatur

Namesake: Stephen Decatur, American naval officer

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

Population (2020): 9,913

Population (historic): 231 (1850); 858 (1870); 4,148 (1900); 5,156 (1930)

Periods of population growth: 1836–1980; 1990s; 2010s
Pre-1940 residences (estimated): 1,405 (32.3%)

_________________________________________________________________________________

View and filter the data. Or see a larger map.

_________________________________________________________________________________

Outstanding Buildings

1. Boeker Log House (c. 1840). 555 West 300S. Monroe. Razed.
2. Charles Heckman House (1867–1868). 11591 Winchester Road. Preble. Italianate.
3. John Christen Farm (1875). 9100 North 000. Root. Italianate.
4. Gerhard Franz Log House (c. 1845). 1244 East 1100N. Root. Razed.
5. *John Lenhart House (1848). 6929 Piqua Road. Root. Greek Revival.
6. John Dirkson Farm (1871). 9960 US Highway 27. Root.
7. Elsias Dailey House (1862). 1717 Piqua Road. St. Marys. Greek Revival.