When Peter Jensen was born on 17 March 1870, in Århus, Denmark, his father, Poul Jensen, was 26 and his mother, Frederikke Anine Magrethe Frederiksen, was 22. He married Adeline Ingeborg Andresen on 1 April 1893, in Rudkøbing, Langelands Nørre, Svendborg, Denmark. They were the parents of at least 2 sons and 3 daughters. He lived in Los Angeles, Los Angeles, California, United States in 1920 and Inglewood Judicial Township, Los Angeles, California, United States in 1940. He died on 1 December 1958, in Inglewood, Los Angeles, California, United States, at the age of 88, and was buried in Inglewood Park Cemetery, Inglewood, Los Angeles, California, United States.