| Year | Title | Role | Notes |
|---|---|---|---|
| 1940 | The Howards of Virginia | Neighbor Girl | Uncredited |
| 1942 | A-Haunting We Will Go | Dante’s Young Admirer | Uncredited |
| 1943 | True to Life | Little Girl | Uncredited |
| 1944 | Gaslight | Paula Alquist - Age 14 | Uncredited |
| 1945 | Son of Lassie | Thea | Credited as Helen Koford |
| 1946 | Shadowed | Virginia ‘Ginny’ Johnson | Credited as Helen Koford |
| 1947 | The Devil on Wheels | Rusty Davis | Credited as Jan Ford |
| 1948 | The Return of October | Terry Ramsey | |
| 1949 | Mighty Joe Young | Jill Young | |
| 1950 | The Great Rupert | Rosalinda Amendola | |
| He’s a Cockeyed Wonder | Judy Sears | ||
| 1951 | The Barefoot Mailman | Adie Titus | |
| Sunny Side of the Street | Betty Holloway | ||
| 1952 | Come Back, Little Sheba | Marie Buckholder | Nominated: Academy Award for Best Supporting Actress |
| 1953 | Beneath the 12-Mile Reef | Gwyneth Rhys | |
| King of the Khyber Rifles | Susan | ||
| 1955 | Daddy Long Legs | Linda Pendleton | |
| The United States Steel Hour | Caroline Schwendinger | Episode: “Scandal at Peppernut” | |
| 1956 | The 20th Century Fox Hour | Ann Winslow | Episode: “The Moneymaker” |
| 1957 | Peyton Place | Betty Anderson | |
| 1958 | Studio One | Annabelle | Episode: “The Man Who Asked for a Funeral” |
| 1959 | Rawhide | Dallas | Episode: “Incident Of The Tumbleweed” (Season 1 Episode 1 9 January 1959) |
| A Private’s Affair | Louise Wright | ||
| 1960 | Platinum High School | Jennifer Evans | Alternative title: Trouble at Sixteen |
| 1960 | Why Must I Die? | Lois King | |
| 1961 | The Rebel | Janice | Episode: “The Executioner” |
| 1962 to 1963 | Empire | Connie Garrett | 20 episodes |
| 1963 | Burke’s Law | Sarah Kingston | Episode: “Who Killed Eleanora Davis?” |
| 1965 | Black Spurs | Anna | |
| 1966 | My Three Sons | Eleanor | Episode: “Steve and the Huntress” |
| 1967 | Batman | Venus | 3 episodes |
| 1968 | A Man Called Dagger | Harper Davis | |
| 1970 | Bonanza | Lydia Yates | Episode: “Gideon the Good” |
| 1976 | Smash-Up on Interstate 5 | Trudy | Television movie |
| 1978 | Death Dimension | Madam Maria | |
| 1983 | Matt Houston | Emily Armor | Episode: “A Novel Way to Die” |
| 1985 | Hell Hole | Sidnee Hammond | |
| 1988 | Wiseguy | Dr. Leitner | Episode: “Phantom Pain”
Uncredited |
| 1989 | Going Overboard | Mistress | |
| 1991 | Marilyn & Me | Woman at Hyde’s Funeral | Television movie |
| 1995 | American Southern | Peggin | |
| 1998 | Mighty Joe Young | Elegant Woman at Party | |
| 1998 | Second Chances | Dallas Taylor Judd | |
| 1999 | Final Voyage | Christina | |
| 2000 | Stageghost | Olive | |
| 2006 | Kill Your Darlings | Ella Toscana | |
| 2007 | The Desert Rose | Jamie Shaw | |
| 2009 | Ariel | Liz | |
| 2010 | Dewitt & Maria | Terry | |
| 2012 | Margarine Wars | Miriam Cuningham | |
| 2014 | True Detective | Lilly Hill | Episode: “Form and Void” |
| 2014 | Looking for Mr. Right (TV Movie) | Instructor | |
| 2015 | Mansion of Blood | Natalie | |
| 2015 | Aimy in a Cage | Grandma |
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