Mayor de Blasio’s re-election campaign announced Monday it has raised more than $1 million from some 3,800 donors over the past six months.

Campaign officials boasted that was the largest number of contributors to a mayoral candidate since 1993 and would allow de Blasio to claim another $1 in public matching funds.

The officials also said that 85 percent of the contributions were for $250 or less.

“We are thrilled by the support the mayor has received from grassroots supporters in all five boroughs,” said Elana Leopold, the campaign finance director.

The mayor’s campaign released the figures before Tuesday’s deadline in an attempt to show his strength as he gears up for re-election this year.

But a political novice who plans to run against de Blasio, real estate developer Paul Massey, disclosed last week that he took in $1.6 million.

Massey has said he won’t join the public financing program and may use some of his funds to challenge the mayor.

De Blasio spent two days last week– Tuesday and Wednesday– with no public schedule so he could spend time on the phone dialing for campaign dollars, sources said.

It’s legal — as long as the mayor made his pitches outside City Hall.

Campaign filings show de Blasio had $1.75 million in his campaign treasury as of July.

De Blasio’s campaign statement Monday didn’t disclose how much he spent to raise the $1 million. Those filings are due by midnight Tuesday.