The Michigan Association of Public School Academies says only seven new charter schools are opening for the 2015-16 school year.
That's down from 17 new charters that opened last year, and 32 in 2013.
Dan Quisenberry, president of MAPSA, said there's been a steady decline since state lawmakers voted to lift the cap on university-authorized charters in 2011.
The drop, he said, is a sign the state's authorization system is working.
"Authorizers, people who are opening charter schools are being responsive to needs," he said. "They open schools where they are needed and they don't [open them] where they're not."
Quisenberry said this fall will be the first time in years a new charter won't be opening in Detroit.
The new schools are in Augusta, Clinton Township, Farmington Hills, Flint, Oak Park, Pinckney and Plymouth.
All are university-authorized charters.