- A Opper
- A. Lincoln Opper
- Adolph Opper
- Beatrice Opper
- Bella Opper
- Camilla Opper
- Charles Opper
- Clarence V. Opper
- Clarence Victor Opper
- Dora Opper
- Doris Opper
- Edward J. Opper
- Edward J. (Mrs.) Opper
- Eleanor Opper
- Elias Opper
- Emily M. Opper
- Eva Opper
- Frank Opper
- Frank (Mrs.) Opper
- Frederick Opper
- Frieda Opper
- Hanna Opper
- Henry Opper
- Hinda Opper
- Jacob Opper
- Jennie Opper
- Leib Opper
- Lottie Opper
- Louis Opper
- Ludwig Opper
- Manny Opper
- Marcia Madeline Opper
- Max Opper
- Morris Opper
- Nellie Sarah Barnett Opper
- Nettie Opper
- P Opper
- Philip Opper
- Reina Opper
- Rosa Opper
- Sabina Opper
- Saul Opper
- V. M. Opper
- W.M Opper
- Yetta Opper