Hi Cay,
I'm trying to connect Samuel to a family as well. Most of the Hyatt's in this area spelled their surname Hieatt and were very particular about it, and it's possible they wrote his name wrong on earlier records. This is what I have for him:
Marriage 25 May 1811: Record #515 Samuel Hiatt to Fanny Bell Bondsman: Daniel Bell
1820: (pg. 15 of the census for Mason County, township not stated).
Samuel Hieatt - head of household (presumably the male age 26-44)
Free White Persons - Males - 26 thru 44: 1
Free White Persons - Females - Under 10: 1
Free White Persons - Females - 26 thru 44: 1
Number of Persons - Engaged in Agriculture: 1
All Other Persons Except Indians not Taxed: 5
1830: same info you have
Possible Death:
Samuel Hiatt on 10 Apr 1856 in Shelby County, KY
Father's name: J Hiatt
Mother's name: E Hiatt
What is your connection to Samuel? That may help.