The news was trumpeted by Blick and other Swiss-German newspapers on Friday.
Turner, 73, has lived near Zurich since 1995, making a mansion in Küsnacht, overlooking Lake Zurich, her principal residence.
“I am very happy in Switzerland and I feel at home here,” she told Blick.
“I could not imagine a better place to live.”
Blick said Turner, whose real name is Anna Mae Bullock, had to undergo an interview with officials in Küsnacht before the municipality approved her “naturalization”.
The singer, who has sold 200 million records, first came to Zurich when her longtime partner, German music manager Erwin Bach was transferred to the Swiss city.
The eight-time Grammy Award winner retired from performing in 2009.
A spokesperson for Turner told Blick that she appreciates the cleanliness, orderliness and four seasons of Switzerland.
And the native of Tennessee is reportedly learning German “diligently”.
So opens a new chapter for the woman with the husky voice once known for the “most famous legs in show business".
Turner long ago turned the page on a tumultuous relationship with Ike Turner, her violent ex-husband and former musical partner, who died in 2007.
After touring the world over, she would never again live elsewhere, and is enjoying simply being a “private person,” Blick reported.