Yilan County is represented in the Legislative Yuan since 2008 by one at-large single-member constituency (Yilan County Constituency, Chinese: 宜蘭縣選舉區; pinyin: Yílán Xiàn Xuǎnjǔ Qū).

With an electorate of 357,077 persons in 2016, it is the least-represented constituency since the split of Hsinchu County Constituency.

Kuomintang Democratic Progressive Party