Andrew Adams won the Penkridge North East & Acton Trussell by-election with 388 votes, ahead of Lib Dem Sam Harper-Wallis on 378.
Labour candidate Norman Smallwood came a distant third with 45 votes.
Councillor Adams, who has served on Penkridge Parish Council, said it would be an "honour and a privilege" to represent the people of the ward.
Among those to congratulate him was Stafford MP Theo Clarke, who said: "Andy will make a great district councillor and I look forward to working with him to deliver for local residents in Stafford."
The by-election was called following the death of long-standing Conservative councillor Isabel Ford.