Harrison Mayor Raymond McDonough apparently suffered a massive heart attack on Wednesday afternoon.
Officials have said McDonough collapsed shortly after returning from lunch. He was found by an attorney who had an appointment with him.
The funeral was in a church across from town hall.
The lifelong Harrison resident had served on the Town Council for 17 years before becoming mayor in 1995. He was credited with spearheading the redevelopment of the 1.2-square-mile Hudson County town on the Passaic River, which has about 14,000 residents.
McDonough was plumber and was retired from the Passaic Valley Sewerage Commission. He was among a number of Democratic officials statewide who supported Republican Gov. Chris Christie for re-election last year.
The Jersey Journal (http://bit.ly/1frpdYA) reports that U.S. Sen. Cory Booker, D-N.J., was among the hundreds of mourners who came out Sunday afternoon for McDonough's wake.
McDonough's death came just a few weeks after his sister passed away.