With 99 percent of the election districts reporting, the numbers show Aronchick with 1,270 votes (53 percent) to 1,142 votes (47 percent) for opponent Frank Caputo.
Aronchick ran as a Democrat while Caputo ran as a Republican.
The special election marked a comeback attempt for Aronchick, who was unseated in the race for a full town board seat term last year. Aronchick won a town board seat in a 2014 special election, unseating then-incumbent and Republican William Monti.
Monti was appointed to the seat earlier in 2014 due to the death of Councilman Bruce Buchholtz.
While Aronchik is likely to prevail, he is only serving out the remaining one year left on the seat's term. It will be up for a regular election to a full, four-year term next November.
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