Unofficial final results from the city’s Board of Elections in the special election to replace a longtime Assembly member of the Upper East Side, Alexander “Pete” Grannis, indicate that a Democrat will be returning to Albany.

With 100% of precincts reporting, the Democratic candidate, Micah Kellner, led with 3,988 votes. His Republican opponent, Gregory Camp, had 2,208 votes. The results have yet to be certified.

The race had garnered attention in recent days, in part because a win for Mr. Camp would mean the Upper East Side district, once known for electing moderate Republicans, would be sending its first GOP representative to Albany in years.

Mr. Kellner had won widespread support from Democratic officials in New York, including Rep. Carolyn Maloney and City Council Speaker Christine Quinn. His campaign tried to connect Mr. Camp to President Bush in the final days of the race, despite Mr. Camp’s positions on social issues. Mr. Camp supports abortion rights, same-sex marriage, and opposes to the death penalty.

Mr. Kellner, 28, is a former aide to Ms. Maloney and said during the campaign that his close knowledge of local concerns made him a stronger candidate.

Mr. Camp, a former investment banker, prosecutor, and deputy director of criminal justice for New York State, was endorsed by Mayor Bloomberg.

Democrats outnumber Republican voters in the district by nearly three to one. There are 74,307 registered voters in the district, but between 5,000 and 10,000 voters were expected to vote yesterday.

Mr. Grannis’ seat was vacated after he resigned to become commissioner of the New York State Department of Environmental Conservation.