EKRE and non-parliamentary party Eesti 200 were the most popular political parties in December, polling by Kantar Emor shows.
EKRE was supported by 22 percent of respondents, a 2 percent increase compared to November's poll.
Eesti 200 followed on 20 percent, a 1 percent rise on last month.
The coalition parties Reform and Center were next most popular with 19 percent and 17 percent respectively.
Opposition parties, the Social Democrats fell 2 percent to 10 percent in December's survey and Isamaa from 10 to 7 percent.
The Green Party had 4 percent support and TULE 1 percent.
Emor conducted the survey between December 9-15 and 1220 citizens aged 18-84 participated.
Editor: Helen Wright