Welcome to Piatt County
History & Genealogy
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Piatt County was formed in 1841 from Macon and Dewitt Counties. It was named after
James A. Piatt, a local resident instrumental in formation of the county.
County Seat Monticello
Largest city Monticello
The settlement of Piatt county began in 1830 when some
settlers came from Ohio. The county government was organized
in 1840 with Monticello, a village of one hundred inhabitants,
as the county town. Settlement increased but slowly
in the county and in 1850 the population was but 1,600
[Source: The Settlement of Illinois from 1830 to 1850]
Piatt County is divided into eight townships:
Bement -- Blue Ridge -- Cerro Gordo -- Goose Creek
Monticello -- Sangamon -- Unity -- Willow Branch
Atwood -- Bement -- Cerro Gordo -- Cisco -- De Land -- Hammond -- Mansfield