Kotanci ranks 51st by electorate among the 68 localities of Diyadin. The neighborhood has a single ballot box, and 72 voters were registered there for the 2023 parliamentary election.
59 people voted at that election. Yeşil Sol Parti took the most votes with 33; AK Parti followed with 11. Yeşil Sol Parti's share here is 2.2 points below the district average. In the presidential runoff, 36 of 52 valid votes went to Kemal Kılıçdaroğlu — 5.0 points below the district average. At the 2017 referendum 47 of 55 valid votes were 'no' — 17.3 points above the district average.
The electorate shrank from 103 registered voters in 2011 to 72 in 2023 — a change of about 30 percent. The neighborhood has stayed on the same line since 2014: the same political line has finished first in all of the last 7 elections (BDP in 2014, Yeşil Sol Parti in 2015, HDP in 2019, DEM Parti in 2024). Turnout at the 2023 parliamentary election was 81.9%, 14.3 points above the district average. The tightest race came at the 2009 local election: LDP took 36 votes to DTP's 32 — a margin of just 4 votes.