Mayor Bill de Blasio spent the week on Staten Island, but he says it didn’t teach him anything new about the borough — the only one he lost in his 2013 election sweep.

“I have to tell you I have been working on Staten Island issues and with people from Staten Island going back over 25 years,” Hizzoner said Friday on his weekly WYNC radio show.

“There’s nothing I learned this week that I didn’t know broadly already about the broad views, the values, the concerns of people here.”

De Blasio added that he did learn about “some specific issues” that he “did not know enough about,” but claimed he already has a “good take” on “the basic realities of Staten Island.”

The mayor argued that the Republican bastion, the only borough to back President Trump over Hillary Clinton, shouldn’t be compared to Rust Belt states, which were Trump strongholds in the election.

“The Rust Belt has had too many areas that unfortunately that have had failing economies, people feeling that government did not serve their needs, did not address their economic distress.

Whereas Staten Island, overall in the scheme of things, is an area that’s doing pretty well and a lot of people do have good jobs,” he said.

“A lot of people in public service have good and secure jobs.”

One of the biggest issues on the island is the state of the roads, and the mayor boasted that a record number of streets have been repaved on his watch.

He was taken aback when a caller to the radio show said his block hasn’t been paved since 1984.

“That’s amazing to me…,” the mayor said.

De Blasio crushed GOP rival Joe Lhota, 73 to 24 percent, in 2013, but lost Staten Island, 53 to 44 percent.

His visit to the island is the first leg of a planned five-borough tour in which the mayor and senior staff will operate for a week at a time outside City Hall.

The mayor’s schedule included meetings with local pols and community leaders, a few hours set aside at Borough Hall on Tuesday to meet with constituents, and a Thursday town hall meeting where residents got to ask him questions.