Crombie left municipal politics earlier in 1978 to seek and win a seat in the House of Commons of Canada as the Progressive Conservative Member of Parliament for Rosedale electoral district.
Sewell received strong support from younger voters, tenants, and the highly educated and affluent.
Barbara Greene, Esther Shiner and Robert Yuill were re-elected to Board of Control with Irving Paisley taking the fourth seat.
Some analysts thought that her chances of retaining the position may have been hurt by her becoming a single mother in the previous year.
Incumbent controllers Brian Harrison, Joyce Trimmer and Frank Faubert were all re-elected while alderman Carol Ruddell took the fourth spot.