Conservative Siobhan Weller said she was “absolutely amazed” to take the Holton Le Clay and North Thoresby seat on East Lindsey District Council. She gained 1,727 votes.
Lincolnshire Independent Terry Aldridge also retained his seat polling 1,225.
Michael Booth for Labour received 679 votes.
Coun Weller added: “My biggest motivation now is not letting down the people who voted for me.”