Oil and gas interests have given an estimated $75 million to Donald J. Trump’s presidential campaign, the Republican National Committee and affiliated committees, far more than has been previously known, according to a new analysis of federal campaign data.

The billionaires Harold Hamm of Continental Resources, Kelcy Warren of Energy Transfer Partners and Jeffery Hildebrand of Hilcorp Energy Co. are among the highest-profile oil and gas contributors to Mr. Trump, giving along with their spouses and companies more than $15 million this cycle.

But the total amount of money flowing to Mr. Trump and his allies from donors with links to fossil fuels is more than five times greater, according to an analysis by the environmental group Climate Power. It comes from mine operators, shipbuilders, engineering firms, hedge funds and little-known oil producers.

That is just the campaign cash that can be found in public records; donations made to nonprofits such as 501(c)(4) organizations, also known as dark money, are usually not publicly disclosed.

“It’s important to start by looking at this systematically and structurally,” said Senator Sheldon Whitehouse, Democrat of Rhode Island and chairman of the Senate Budget Committee, who is investigating oil industry campaign donations.

Mr. Whitehouse referred to an analysis by the International Monetary Fund that found American fossil fuel companies receive $700 billion of subsidies each year, when accounting for federal tax breaks and undercharging of environmental costs. He was not surprised by the contributions from oil interests to Mr. Trump.

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