Barbara Jeffery has been elected to fill the Richmond Valley Council position left vacant by the death of her husband Ray.
Mr Jeffery was killed in a car accident in Evans Head last December.
Mrs Jeffery won the by-election held last Saturday to fill the vacancy, edging ahead of nearest rival Sandra Duncan-Humphry, of Casino, on preferences.
Ms Duncan-Humphry finished the primary count 165 votes ahead of Mrs Jeffry.
But after preferences, Mrs Jeffry was elected with 4247 votes, ahead of Ms Duncan-Humphry (3552).