Mayor Bill de Blasio’s political operation raised another $600,000 over the first six months of the year as Hizzoner laid the groundwork for his longshot presidential bid, according to a filing released late Wednesday.

De Blasio’s federal political action committee, Fairness PAC, pulled in $606,000 in contributions and spent $580,000 between January 1 and June 30, according to the report filed with the Federal Election Commission.

Top donors included hoteliers and business partners Richard Born and Ira Drukier, who — along with their wives — gave the Fairness PAC $20,000.

That’s on top of the $57,000 the two men, their families and employees have given to de Blasio since August 2018. Those donations came through the Fairness PAC, de Blasio’s presidential campaign and his state political action committee, NY Fairness.

The flood of cash to Hizzoner’s political operation comes as a company the two men control is seeking to overhaul the historic Chelsea Hotel, non-profit news website The City reported Wednesday.

Other bold face donors include media magnet Barry Diller, who gave $5,000, and fashion icon Tommy Hilfiger, who gave $1,000.

The report also said the PAC gained another $128,000 from “refunds, rebates, etc.” from Hizzoner’s presidential campaign, de Blasio 2020, and his state political action committee, NY Fairness.

De Blaiso’s fundraising practices have come under scrutiny after a string of stories exposed how he used his state PAC to float his cash-strapped presidential campaign and to pick up the tab as he explored launching the possible quixotic run.