Rogers came away with 91 votes, or 40.3 percent, at the end of the evening Nov. 8, and Johnson, had 89 votes, or 39.4 percent.
Jeff Crook, the third candidate in that race, trailed with 46 votes.
The runoff between Johnson and Rogers will take place Tuesday, Dec. 6, at the Fairmount Community Center, according to Shae Hicks, director of Gordon County Board of Elections and Voting Registration.
Early voting begins the week of Nov. 28, she said; early voters can cast their ballots at Fairmount City Hall.
Hicks said the Nov. 8 elections brought out 12.93 percent (or 3,035 individuals) of the 23,464 registered voters eligible to participate.
Of those who turned out to vote, 1,298 were city voters, according to Hicks.
"For the municipal elections, we had a really good turnout," she said.
Also on the ballot as a countywide referendum was the decision of whether or not to continue the one-cent SPLOST (Special Purpose Local Option Sales Tax). Voters chose to implement a 2012 SPLOST with 69.08 percent of the votes in the affirmative.
The City of Fairmount's referendum for issuance of licenses to sell distilled spirits by the drink also passed 58.2 percent to 41.8 percent.