The legislature also held five special sessions during the term.

[1][2] Senators representing odd-numbered districts were newly elected for this session and were serving the first two years of a four-year term.

Assembly members were elected to a two-year term.

Senators representing even-numbered districts were serving the third and fourth year of their four-year term, having been elected in the general election held on November 2, 2004.

The governor of Wisconsin during this entire term was Democrat Jim Doyle, of Dane County, serving the first two years of his second four-year term, having won re-election in the 2006 Wisconsin gubernatorial election.