Bay Area internet service provider Sonic is expanding into southern San Francisco neighborhoods and Daly City.

Mission Terrace, Excelsior, Crocker Amazon and northern Daly City will have the company’s gigabit fiber internet service by the end of the summer. The announcement follows Sonic’s recent expansion in the East Bay. Headquartered in Santa Rosa, Sonic serves over 100,000 customers on the California coast and intends to continue growing across San Francisco and the Bay Area, according to CEO Dane Jasper.

“It’s really exciting to see the public response,” Jasper said. “The public has been frustrated with their current broadband and telephone-service options, so there’s a real interest in a disruptive new service.”

Sonic is known for its commitment to its customers’ privacy, and Jasper has also championed net neutrality.

“Until there is adequate competitive choice for broadband internet access for consumers, we need to continue to have some form of regulation around consumer protection privacy and neutrality,” Jasper said.

Jasper has made two trips to Washington, D.C., in the past month. He is lobbying against a proposal before the Federal Communications Commission that would hobble Sonic’s access to AT&T’s existing lines, which Sonic argues it needs to maintain a competitive broadband business while it builds out its own fiber network.

Sonic says its $40-a-month gigabit fiber internet service is 20 times faster than the average download speed in the U.S.

Rebecca Aydin is a San Francisco Chronicle staff writer. Email: rebecca.aydin@sfchronicle.com Twitter: @beckyaydin