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Mississippi
County was once a part of Arkansas County, then Phillips County and
next Crittenden County, from which it was separated
by the Territorial Legislature November 1, 1833, and named Mississippi
County from the great river that is her eastern boundary line.
The original boundary extended to St. Francis river, and included 1,000
square miles. The first County seat, located opposite the first
Chickasaw Bluffs, was called Cornwall.
Cornwall was
on the site of an old Spanish encampment and has long since
disappeared, and Osceola was adopted soon thereafter.
