She'll replace outgoing Councillor Ken Smollen, who made the decision to step down earlier this month.
A new councillor has been co-opted to the local authority in Offaly.
Sandy Feehan-Smollen will replace her husband, Independent rep Ken Smollen, who made the decision to step down earlier this month after being diagnosed with lung cancer.
She was proposed by Social Democrats Councillor Clare Claffey, which was seconded by Sean O'Brien.
Ms. Feehan-Smollen is the current chairperson of Clara Swimming Pool, and will become the second woman on Offaly County Council.
Well-wishes were paid to outgoing Councillor Smollen, who spent four years on the local authority, as his wife was co-opted.
Eurovision Participation Decisions Come Down To Money And Audience - Eurovision Author
Fiosrú Finds Gardaí Acted Lawfully Before Fatal M9 Crash
EU Agricultural Commissioner "Blown Away" By Ploughing - Anna Marie McHugh
HSE Accused Of Withholding Home Support Data With 5,600 On Waiting Lists
Over 27,500 Midlands Drivers Could Pay Hundreds More For Car Insurance
Midlands Set For A Night Of Culture And Creativity
Westmeath Family Banned From Social Media Following Alleged Violent Incident
Laois TD Raises Concerns Over Lengthy Reserve Defence Forces Recruitment Process