Mayor Bill de Blasio disclosed two trips he made on city business during 2015 — and how the travel was funded — in forms made public Thursday by the city Conflicts of Interest Board.

The Democrat spoke on income inequality in Iowa in April 2015. The trip was paid for by the Campaign for One New York, the nonprofit set up to advance his political agenda. It cost between $1,000 and nearly $5,000, his forms showed.

De Blasio’s disclosure filing — a process that is annually required of the city’s elected officials — showed he also took a trip sponsored by Israeli entrepreneur Baruch Eliezer Gross and cost between $5,000 and nearly $48,000. He went to Israel in October 2015 to speak on anti-Semitism.

De Blasio entered his salary as between $100,000 and nearly $250,000 in the filing. He earns $225,000 as mayor and is entitled to a 15 percent raise under a bill he signed this in February.

He also reported rental income from four sets of tenants at two homes he owns in Park Slope, Brooklyn, and disclosed his mortgages on the homes, the filing showed.

Two other city officials took business trips to Israel paid for by an outside group, according to their forms filed with the Conflicts of Interest Board.

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Public Advocate Letitia James took a “fact-finding trip to Israel related to citywide responsibilities” in May 2015, costing between $5,000 and nearly $48,000 and paid for by the Jewish Community Relations Council, her filing showed.

City Council Speaker Melissa Mark-Viverito was part of a delegation that traveled in February 2015 to Israel, also in the same expense band and also on the Jewish Community Relations Council’s dime, her filing showed.

The only trips disclosed by City Comptroller Scott Stringer were two to Puerto Rico paid for with his 2009 campaign funds. Each trip cost between $1,000 and nearly $5,000.