TIVERTON — Incumbents Cecil E. Leonard and Arthur R. Wyman Jr. may have lost their bids for reelection on the Tiverton Town Council last night as challengers Hannibal F. Costa, the former town clerk, and John G. Edwards IV squeezed them out in the 10-way contest. A third challenger, former council president Claudette J. Linhares, came in last.

Apparently relected to their posts were President Louise Durfee, Joanne M. Arruda, Donald Bollin, Paul E. Carroll, and Brian A. Medeiros. But the results could change because 220 mail ballots remain uncounted by the state Board of Elections.

And only 24 votes separated Carroll, the seventh-ranked finisher, from Wyman, who came in eighth.

The highest vote-getter in the council race was Arruda, with 61 percent of the 6,202 ballots cast in town yesterday. Durfee came in second with 60 percent.

Voters also approved ballot questions requiring the town to come up with an alternative to the Financial Town Meeting and a charter amendment to shrink the terms of Budget Committee members to four years from six.

But they overwhelming rejected, by 61 percent of the vote, an amendment to the charter to make the Town Treasurer’s post an appointed position. The turnout was 55 percent of the 11,346 eligible voters.

The candidates in all other local races faced no opposition. Leonard C. Wright, former business manager at the school department, and Jan W. Bergandy have automatically been elected to the School Committee.