Locations > California > Mariposa Mariposa, California UFO Sightings Mariposa, California, Unspecified UFO Sighting - I was told they were taking my family from me 2 years ago by someone or something. I watched my wife being possessed for 2 years. I came home 5 months... 10/22-2022 Mariposa, California, Lights UFO Sighting - Hey my daughter and just saw a row of lights in the sky that was miles long. I tried to take a video but the video is for some reason pitch black. It ... 05/07-2021 - 1 comment Mariposa, California, Unspecified UFO Sighting - My husband my son and myself saw a huge UFO while driving down Old Priest Road near Groveland Calif. It was between 1979 and 1987. I can't find any in... 02/20-2020       Submit a UFO sighting for Mariposa, California: When did this happen (optional):