The 19-year-old stands 5-foot-10 and weighs 175 pounds.
The Draft concludes Saturday, with exclusive coverage of Rounds 11-40 beginning on MLB.com at 10 a.m. PT.
Loehr, who was named a 2014 First Team All-American by Perfect Game, started at second base for USA Baseball's 18U team, scoring the winning run in the World Cup final against Japan last September.
He started 13 games for Team USA, posting a 1.000 fielding percentage as well as team highs in stolen bases (six) and walks (seven).
"We were able to identify a high school kid that put together a combination of performance and skill, as well as the competitiveness and the makeup that we look for in those guys," said A's assistant director of scouting Michael Holmes.
After drafting college third baseman Matt Chapman in Round 1, the A's took four straight college right-handers before snagging Loehr.
Aaron Leibowitz is an associate reporter for MLB.com.