More than a million registered voters in the Seattle area can now cast a ballot for an obscure election using a smartphone or computer. Organizers are calling the pilot program the largest mobile voting effort in the country.

Julie Wise, the director of elections in King County, said the election would be “a key step in moving toward electronic access” for voters across the region, in a statement released on Wednesday from Tusk Philanthropies, the nonprofit partnering with the county’s board of elections.

The vote in King County, Wash., which includes Seattle, will fill an open spot on the board of the King Conservation District, an agency that manages natural resources. Beginning this week, eligible voters will be able to use a smartphone or computer to log into a portal created by Democracy Live, a Seattle-based company that receives government funding.

“There’s no special app, there’s no electronic storage of votes. Instead a voter’s choice is recorded onto a PDF, which they then verify before submission,” Ms. Wise said in an email on Thursday.