Sargeant was classified 10th at Austin's Circuit of the Americas after Mercedes' Hamilton was stripped of second place and Ferrari's Leclerc lost his sixth place when their cars failed post-race checks.
The last U.S. driver before the 22-year-old Florida native to score in a grand prix was Michael Andretti with McLaren in 1993.
"It’s amazing to score my first point in F1 on home turf after the challenging weekend I’ve had," said Sargeant, who failed to finish the previous race in Qatar after suffering exhaustion in the heat.
The team are seventh out of 10 in the constructors' standings, 10 points clear of eighth-placed Alfa Romeo with four races remaining.
Australian Daniel Ricciardo, returning from injury at AlphaTauri, is now the only driver on the starting grid yet to score this season.
Persons:
Williams, Logan Sargeant, Greenlee Beal, Lewis Hamilton, Charles Leclerc, Sargeant, Mercedes, Hamilton, Ferrari's Leclerc, Michael Andretti, I’ve, we’ve, Alex Albon, Romeo, Daniel Ricciardo, Alan Baldwin, Michael Perry
Organizations:
United, Prix, REUTERS, Williams, Formula, Austin's Circuit, McLaren, Thomson
Locations:
United States, Americas, Austin , Texas, U.S, , Texas, Florida, Qatar, AlphaTauri, London