Kustepe ranks 16th by electorate among the 20 localities of Samsat. The neighborhood has a single ballot box, and 41 voters were registered there for the 2023 parliamentary election.
31 people voted at that election. AK Parti took the most votes with 21; independents followed with 6. AK Parti's share here is 0.9 points above the district average. In the presidential runoff, 29 of 34 valid votes went to Recep Tayyip Erdoğan — 4.8 points below the district average. At the 2017 referendum 34 of 37 valid votes were 'yes' — 2.1 points below the district average.
The tightest race came at the 2015 parliamentary election: AK Parti took 15 votes to MHP's 8 — a margin of just 7 votes. The electorate shrank from 60 registered voters in 2011 to 41 in 2023 — a change of about 32 percent. Turnout at the 2023 parliamentary election was 75.6%, 15.9 points below the district average. First place has changed hands 5 times here since 2009.