[1] On March 5, 1957, Jameson was nominated by President Dwight D. Eisenhower to a seat on the United States District Court for the District of Montana vacated by Judge Charles Nelson Pray.
He remained in senior status until his death on October 8, 1990.
[2][1] In 1973, Jameson received the highest honor given by the American Bar Association, the ABA Medal.
[5] The State Bar of Montana's highest honor is also named after Jameson.
The William J. Jameson Award has been given annually since 1989 to a Montana attorney who, among other criteria, "Shows ethical and personal conduct, commitment and activities that exemplify the essence of professionalism".