Union Minister Shashi Tharoor retains the Thiruvananthapuram seat by defeating his BJP rival O Rajagopal.
Congress was in a shock initially as counting trend indicated Tharoor trailed by over 10,000 votes against his O Rajagopal.
LDF nominees are ahead in Kasargode, Vatakara, Palakkad, Alathur, Thrissur, Chalakkudi, Idukki, Mavelikkara and Attingal.
Trailing Congress candidates include Tharoor, Mullapally Ramachandran and party spokesperson P C Chacko.
The UDF leads in Ernakulam, Wayanad, Kozhikode, Malappuram, Ponnani, Kottayam, Kollam, Alappuzha and Pathanamthitta.
Union Minister K V Thomas is in a comfortable position with a lead of over 15,000 votes in Ernakulam.
IUML leader E Ahamed has established an unassailable lead of over 36,000 votes in Malappuram and his colleague E T Muhammad Basheer a clear edge of over 13,000 votes in Ponnani.