Mitt Romney handily won Trumbull with 517 votes, while Newt Gingrich was runner up with 86 votes.
Trumbull logged a turnout of roughly 12 percent of 6,027 registered republican voters, according to the registrar's office. Seven hundred thirty republicans cast ballots, including 35 absentee ballots.
First Selectman Tim Herbst, a republican, said turnout was low because "it's basically a foregone conclusion that [former Massachussetts Gov.] Romney was going to be the nominee."
The media has already moved ahead, naming Romney as the challenger to Pres. Barack Obama, Herbst said.
But officially, the Republican National Convention begins Aug. 27 and ends Aug. 30.
The early assumption didn't sit well with one voter who declined to identify herself outside Tuesday afternoon.
"I'm disappointed" at the turnout, she said. The primary was well-advertised nationally, but it fizzled locally, she added.
Still, casting ballots is just as important. The winner should not be assumed because "you don't know what's going to happen in the long run."
"I'm always disappointed when the media interject themselves" before the official decision is made, the voter said.
She noted that she grew up in Michigan and followed Romney's father's career. She would not say whom she chose in the primary.
Meanwhile, the primary marks the last time Trumbull is using seven voting districts. After 28 years of the same system, the Town Council recently voted to change to four districts.
The voting went as follows:CANDIDATE VOTES Newt Gingrich 86 Ron Paul 72 Mitt Romney 517 Rick Santorum 42 Uncommitted 13