Jacob & Harriet cannot be found in the 1850 census, nor any census after. AIS Mortality Index lists:
1850 LONG HARRIET HAMILTON CO. OH 21 F JUL OH CHOLERA NONE LISTED MRT197_196460 (b. 1828)
1850 LONG JACOB HAMILTON CO. OH 23 M JUL OH CHOLERA SHOEMAKER, CORDWAINER MRT197_196493 (b. 1826)

Perhaps this is both of them, neither living long enough to appear in a census. It is not known if they had any children.

Harriet (Booram) Long was 
d/o Jesse Boram (& Jane)
g d/o Aaron Booram (& Mary Lane)
gg d/o William Booram (& Hannah Clawson)
ggg d/o Adriaen Boerum/Boor?m (& Sarah Smock)
gggg d/o Hendrick Willemse Van Boerum (& Maria Adriaense Smit)
ggggg d/o Willem Jacobse Van Boerum (& Geertje Hendrickse van Goch)

additional links: Daniel Artles et al vs. Elizabeth Booram widow et al