With all 25 precincts reporting, Worthan had almost 8,800 votes, or 70 percent, to 3,747 votes, or 30 percent, for Rainwater, according to information from the Georgia Secretary of State.
Rainwater was attempting a political comeback after losing the chairman's seat to Worthan in 2004. She served three terms from 1992 to 2004.
Worthan, who is seeking a third term, will face Democrat Romona Jones in the Nov. 6 general election. Jones was unopposed Tuesday for her party's nomination.
In other races, former state representative Bob Snelling and Douglas County School Board member Mike Miller apparently will square off in an Aug. 21 runoff for the Republican nomination for the House District 66 seat.
Snelling received 49.63 percent of the vote in the race, according to the Georgia Secretary of State. Miller received 27.17 percent to finish second and qualify for the runoff. More than 50.0 percent of votes are needed to win outright. District 66 includes parts of Douglas and Paulding counties.
Former Douglasville mayor Mickey Thompson received 23.2 percent to finish third.
The winner will face Democrat Kimberly Alexander in the Nov. 6 general election. Alexander was unopposed for the Democratic nomination.
In House District 62, Marvin Arrington Jr. and LaDawn "LBJ" Jones will face each other in the Aug. 21 runoff election after neither won outright Tuesday.
Arrington was the top vote-getter as he received 47.66 percent of the vote. Jones finished second with 28.47 percent in the district, which includes parts of Douglas and Fulton counties. No Republicans qualified for the seat.
Incumbent Bill Hembree was unopposed for the Republican nomination for the House District 67 seat, which includes parts of Douglas and Paulding counties. He will face Democrat Leigh McMutry in the Nov. 6 general election.
Douglas residents also voted to reject the T-SPLOST by almost a 2-1 margin. It failed in the entire Atlanta region 62 percent to 38 percent.
Also, in the Douglas County Commission District 2 race, incumbent Kelly Robinson easily defeated Freddie Ashmon in the Democratic primary.
A total of 28 percent of Douglas County's registered voters cast their ballots in the election.
Light rain failed to keep Douglas voters at home early in the day Tuesday as fairly heavy voting took place in the morning hours, said Wes Tallon, Douglas County’s director of communications.
Heaviest voting was in the western part of Douglas County, where polls opened at 7 a.m. in the 25 voting precincts, Tallon said.
Three largely contested state races for House District 62 and 66, and Senate District 35 could go into a runoff due to the number of candidates. All districts include Douglas County but extended into neighboring counties, as well.
Election results from Georgia’s 159 counties will go through the Georgia Secretary of States office for the first time, Tallon said.
Complete election results can be found by accessing a link to the secretary of state’s website at www.celebratedouglascounty.com.
Live election results will be posted via our twitter account @NeighborNews.