Richard Brown yesterday became the longest-serving district attorney in Queens history.

Brown, who was first elected to office on June 1, 1991, completed his 6,874th day on the job, breaking a record by Benjamin Downing that dates to 1883.

Brown has a long way to go before catching recently retired Manhattan DA Robert Morgenthau’s 33 years.

“This historic achievement could not have been possible without the overwhelming support and confidence of the people of Queens County,” Brown said.