At the time of the Act of Independence, six of the signatories were officially nonpartisan, seven were members of the conservative Lithuanian Christian Democratic Party, two were affiliated with the Lithuanian Nationalist Union and the Social Democratic Party, and Jonas Vileišis was affiliated with the Party of National Progress and the left-wing Lithuanian Popular Socialist Democratic Party.
Pada masa UU Kemerdekaan, enam penandatangan secara resmi merupakan nonpartisan, tujuh orang adalah anggota Partai Demokrat Kristen Lithuania konservatif, dua berafiliasi dengan Uni Nasionalis Lithuania dan Partai Sosial Demokrat Lithuania, dan Jonas Vileišis berafiliasi dengan Partai Perjuangan Nasional dan Partai Sosialis Demokrat Populer Lithuania sayap kiri.