US Counties within Illinois in which the Least tern, interior pop. is known to or is believed to occur:

State County
Illinois Williamson
Illinois White
Illinois Washington
Illinois Wabash
Illinois Union
Illinois St. Clair
Illinois Randolph
Illinois Pulaski
Illinois Pope
Illinois Perry
Illinois Montgomery
Illinois Monroe
Illinois Massac
Illinois Madison
Illinois Macoupin
Illinois Lawrence
Illinois Johnson
Illinois Jersey
Illinois Jackson
Illinois Hardin
Illinois Gallatin
Illinois Franklin
Illinois Edwards
Illinois Clinton
Illinois Calhoun
Illinois Alexander

This report contains Counties in which this species is known to or is believed to occur. If you are looking for the Section 7 range (for Section 7 Consultations), please visit the IPaC application.