He married Sophia Vickers (Vikers, Vikors) on August 24, 1845 in, Ohio. Sophia was born in April, 1827 in Ohio.
Jacob and Sophia's chilren included:
Harriet Baker Walker (1846, married Asahel Walker),
Philip Baker (1848),
Mary Baker (1849),
Elizabeth Baker (1855),
William Baker (1857),
Orra Baker (1864),
Sherman C. Baker (1865),
Lemuel W. Baker (1870), and
Ephriam L. Baker (1874).
The family appeared in the 1850 census of German Township. The family consisted of Jacob age 27 who was a farmer, Sophia age 23, Harriet age 4, Philip age 2, and Mary who was two months. Jacob Branstitter age 11 also lived with the family.
In 1860 they were in Lincoln, Logan County, Illinois.
In 1870 and 1880 the family was in Goose Creek, Piatt County, Illinois. In 1880 the family consisted of Jacob age 57, who was a farmer, Sofiah age 23, William age 23, Orra age 16, Sherman age 14, Lemuel age 10 and Ephram age 5.
Jacob died on December 31, 1899 in Independence, Polk County, Oregon and Sophia died on February 1, 1910. They are buried together at Hilltop Cemetery.
Clark County, Ohio was formed March 1, 1817, from Champaign, Madison and Greene Counties. The first settlement was in 1796. The inhabitants of German Township were German Lutherans who came from Virginia.
Buildings in Clark County, Ohio ranged from simple log cabins to sophisticated Italianate and Gothic Revival structures.