The California governor’s mansion isn’t one of the more than 300 homes and apartments available in Sacramento through Airbnb. Even so, the San Francisco company so far appears more committed than any other entity to boosting Lt. Gov. Gavin Newsom’s bid for the 2018 Democratic gubernatorial nomination.

A new analysis of campaign data shows that Airbnb employees have given $225,850 to Newsom’s effort. Meanwhile, potential opponents, who include former Los Angeles Mayor Antonio Villaraigosa and California Treasurer John Chiang, reported their largest contributions from any one source have barely topped $100,000.

The analysis was conducted by MapLight, a Berkeley nonpartisan research organization that tracks political spending and its influence. All figures are based on the latest data made available by the California secretary of state as of last Monday.

The short-term rental giant’s generosity to Newsom’s campaign shouldn’t come as a surprise. Although activists have argued that Airbnb offerings are restricting the availability of affordable Bay Area housing, Newsom has emerged as a major political booster of the gig economy, which also includes services Uber and Lyft, both based in San Francisco.

Newsom criticized the University of California in 2014 for a policy that restricted employees from using services such as Airbnb and Uber. He also campaigned against a 2015 San Francisco referendum that would have limited short-term rentals to 75 days per year. In an advertisement sponsored by Airbnb, Newsom said the measure “goes too far. It’s just too extreme.” The measure failed, gaining only 45 percent of the vote.

The company declined to comment on its donations, which included maximum individual amounts of $56,400 contributed by Brian Chesky, the company’s chief executive, and Laurence Tosi, Airbnb chief financial officer.

With 20 months remaining before the election, the three major Democratic contenders have collectively raised about $19.1 million in campaign funds in their bid to replace term-limited Gov. Jerry Brown.

With California the most populous state in the nation, the race probably will be more expensive than other states where governors’ seats are opening up, including Florida, Ohio and Colorado. Even so, spending on the California contest is likely to be lower than in 2010. More than $244 million was raised in the 2010 gubernatorial election, with GOP nominee Meg Whitman’s bid accounting for more than $176 million. The Hewlett Packard Enterprise chief lost to Brown, who raised more than $40 million.

Newsom announced plans to run in early 2015, barely three months after Brown was re-elected to his fourth stint in the governor’s mansion and second consecutive term. The lieutenant governor reported receiving more than $11 million in contributions since then. Meanwhile, Chiang has raised more than $4.7 million, and Villaraigosa reported a little more than $2.9 million.

Other big supporters of Newsom include employees at the San Francisco private equity firm Tao Capital Partners, which has given $209,200 to the lieutenant governor, and the Wonderful Co., a Los Angeles holding firm, which has donated $112,900. Other major boosters include workers at San Francisco companies such as cloud-computing giant Salesforce ($86,400) and Twitter ($84,800).

Villaraigosa’s campaign reported receiving $112,800 from the Wonderful Co. He’s also received $61,400 from Mapleton Investments, owned by Los Angeles billionaire philanthropist Marc Nathanson. Villaraigosa has reported donations of $56,400 — the individual maximum for the 2015-16 election cycle — from 18 organizations including the Anschutz Corp., owned by conservative billionaire Philip Anschutz; the Eli and Edythe Broad Foundation; Netflix; and Ryan Seacrest Enterprises.

Chiang has received $100,000 from Seville Classics of Torrance (Los Angeles County) and $94,600 from Yin McDonald’s, a Vacaville operator of restaurant franchises owned by longtime Chiang booster C.C. Yin.

A January survey by Public Policy Polling found Newsom leading other current and potential candidates with 25 percent of the vote. San Diego Mayor Kevin Faulconer trailed with 20 percent. Villaraigosa had 9 percent of the field, and Chiang 2 percent.

Five of the eight candidates listed in the poll haven’t established formal campaign committees, including Los Angeles Mayor Eric Garcetti, a Democrat (13 percent); former Fresno Mayor Ashley Swearengin, a Republican (12 percent); Democratic philanthropist and billionaire hedge fund manager Tom Steyer (4 percent); Secretary of State Alex Padilla, a Democrat (3 percent); and Faulconer.

Delaine Eastin, former state superintendent of public instruction who announced her candidacy in November, wasn’t listed in the poll. Eastin reported raising $59,000.

The poll of 882 California voters, taken Jan. 17-18, had a 3.3 percent margin of error.

Frank Bass is a reporter for MapLight, www.maplight.org.