2018Flipped from RepublicanFinal results
2018 election for New Jersey's 3rd District
U.S. House · New Jersey
Andy Kim (D) won with 50.0% of the vote, defeating Thomas MacArthur (R) by 1.3 points, a seat Republicans won last time.
Andy KimDemocrat · winner
50.0%153,473
Thomas MacArthurRepublican
48.7%149,500
Lawrence BerlinskiConstitution
1.3%3,902
306,999 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Andy KimThomas MacArthur
$6.4M
Raised by the campaign
$4.8M
$6.4M
Spent by the campaign
$4.8M
$63.8K
Cash on hand
$27.6K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018