Contests for Nassau County district attorney and Islip Town supervisor top the list of political party primaries Thursday on Long Island.

In the most high-profile matchup, acting Nassau District Attorney Madeline Singas is taking on former Manhattan prosecutor Michael Scotto for the Democratic nomination.

Singas has the backing of the Nassau Democratic Party and a war chest of more than $800,000, according to recent state campaign finance reports.

Scotto, the former chief of the labor racketeering unit and rackets bureau in the Manhattan district attorney's office, has about $13,000 on hand, according to the filings.

The winner will take on Republican Hempstead Supervisor Kate Murray in the general election.

In Glen Cove, Mayor Reginald Spinello, an Independence Party member, is running in a Republican primary against Glen Cove City Councilman Anthony Gallo Jr. Spinello is endorsed by the county Republican Party.

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In Long Beach, voters will pick from five Democratic candidates for City Council after Nassau Democratic chairman Jay Jacobs and Long Beach Democratic chairman Michael Zapson endorsed competing slates.

In Islip, former Suffolk County Legis. Ricardo Montano of Brentwood leads a slate of insurgent Democrats as he runs on the party's nomination for town supervisor against Thomas Licari, who has the backing of the Islip Democratic Party. The winner will face Republican Supervisor Angie Carpenter in November.

Democratic primaries also will be held for Islip Town clerk, receiver of taxes and for two town council seats.

In Riverhead, Supervisor Sean Walter is in a GOP primary against town board member Jodi Giglio, who has the town party's endorsement.

Town council primaries also will be held in Glen Cove, Riverhead and Smithtown (Republican Party), Huntington (Working Families Party) and Southampton and East Hampton (Independence Party).