The 59th Legislative Assembly consisted of a Senate with 47 senators and a House of Representatives with 94 representatives. The 59th Legislative Assembly organized December 6-8, 2004, and met in regular session from Tuesday, January 4, 2005, through Saturday, April 23, 2005.

Generally, the senators from odd-numbered districts were elected to four-year terms at the November 2002 general election and the senators from even-numbered districts were elected to four-year terms at the 2004 general election.

Two representatives are elected from each of 47 senatorial districts. Generally, the representatives from odd-numbered districts were elected to four-year terms at the November 2002 general election and the representatives from even-numbered districts were elected to four-year terms at the 2004 general election.