Othes to do it outdoors.
Jim Ryun 3:58.3 May 22, 1965 KSHSAA Track and Field Championships
Wichita,
Kansas
Tim Danielson 3:59.4 June 11, 1966 San Diego Invitational San Diego, California
Marty Liquori 3:59.8 June 23, 1967 AAU Track and Field Championships
Bakersfield, CA
Alan Webb 3:53.43 May 27, 2001
Prefontaine Classic Eugene, Oregon
Lukas Verzbicas 3:59.71 June 11, 2011
Adidas Grand Prix New York City
Matthew Maton 3:59.38 May 8, 2015 Oregon Twilight Meet
Eugene, Oregon
Grant Fisher 3:59.38 June 4, 2015 Festival of Miles
St. Louis, Missouri
Michael Slagowski 3:59.53 April 29, 2016 Jesuit Twilight Invitational
Portland, OR
Reed Brown 3:59.30 June 1, 2017 Festival of Miles St. Louis, Missouri