Pulaski County was formed on March 3, 1843, out of parts of Alexander and Johnson counties.  It was named in honor of Casimir Pulaski who was killed at the siege of Savannah in the Revolutionary War.
     Mound city is the County Seat.  Mounds is the largest city being located along the Ohio River in the southwestern portion of the state, known locally as "Little Egypt."
Source:  https://en.wikipedia.org/wiki/Pulaski_County,_Illinois