Well, many of these credits are accurate, but TMDb needs a little more research for some of the others.
For example, Jan Clayton is listed here with only one appearance, whereas she headlines the show along with George Cleveland, Tommy Rettig and Lassie for its first three full seasons, as well as part of its fourth.
Richard Garland portrays Constable Clay Horton in many of these early episodes, whereas TMDb doesn't list him at all.
Leachman plays the second matron, in season four, but only has one citation here.
Lassie is played by a string of descendants of the original collie, so that's okay if she's classified as a single actress although this series' central figure.
Series Cast (with at least 18 appearances)
Lassie Lassie Lassie ... / ... 366 episodes, 1954-1973
Jon Provost ... Timmy Martin / ... 249 episodes, 1957-1964
June Lockhart ... Ruth Martin 207 episodes, 1958-1964
Hugh Reilly ... Paul Martin 170 episodes, 1958-1964
Lassie the Dog ... Lassie 169 episodes, 1954-1972
Robert Bray ... Corey Stuart 118 episodes, 1964-1968
Jan Clayton ... Ellen Miller 117 episodes, 1954-1957
Tommy Rettig ... Jeff Miller 116 episodes, 1954-1957
George Cleveland ... George 'Gramps' Miller 116 episodes, 1954-1957
Joey D. Vieira ... Porky Brockway / ... 91 episodes, 1954-1957
George Chandler ... Uncle Petrie Martin / ... 59 episodes, 1956-1959
Arthur Space ... Dr. Frank Weaver / ... 41 episodes, 1955-1964
Andy Clyde ... Cully Wilson / ... 31 episodes, 1959-1966
Jon Shepodd ... Paul Martin / ... 29 episodes, 1957-1958
Cloris Leachman ... Ruth Martin 28 episodes, 1957-1958
Todd Ferrell ... Boomer Bates / ... 26 episodes, 1958-1959
Jed Allan ... Scott Turner / ... 26 episodes, 1968-1970
Robert Foulk ... Sheriff Miller / ... 24 episodes, 1954-1970
Larry Wilcox ... Dale Mitchell / ... 24 episodes, 1971-1973
Jack De Mave ... Bob Erickson / ... 21 episodes, 1968-1970
Larry Pennell ... Keith Holden 21 episodes, 1972-1973
Florence Lake ... Jenny / ... 20 episodes, 1954-1962
Richard Garland ... Constable Clay Horton / ... 19 episodes, 1954-1957
Lloyd Nelson ... Radio Announcer / ... 19 episodes, 1957-1972
Ron Hayes ... Garth Holden / ... 18 episodes, 1968-1972
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Reply by Banana
on September 9, 2019 at 8:29 PM
Hi there, if you have access to the episodes, feel free to correct any mistake. The regular cast for each season are here: https://www.themoviedb.org/tv/5368-lassie/edit?active_nav_item=regular_cast and the guest stars for each episodes are over there: https://www.themoviedb.org/tv/5368-lassie/season/1/episode/1/edit?active_nav_item=guest_stars
Reply by QuitePleasant
on September 9, 2019 at 9:57 PM
Thank-you, Banana Moderator.
Well, the original "Lassie" television series runs 19 seasons, from 1954 through 1973, so there would be cast changes among its regular except for Lassie, herself, although she doesn't act through the entire series because her descendants step in, one after another, wherever some leave off, and also she is played by a male collie, which only begins the confusion because in more than one season, s/he delivers puppies, and the human casting becomes even more complex over the years for quite a few reasons.
Appreciate your consideration!