RealTime Fantasy Sports announced this week that it has acquired league-commissioner site FantasyCitySports.com.

RTSports president Mark Hanna said his company heard that FCS — which, according to its site, has been doing the fantasy thing since 1984 — was looking into making such a deal. Although talks took several months, Hanna said that the process wasn’t too difficult.

“We were excited to work with them because our No. 1 method of ‘advertising’ is word-of-mouth,” Hanna told FSB.com. “We are confident that their clientele (who are VERY loyal) will be so satisfied with our site that they will tell their friends.”

According to Compete.com figures from the past year, that client base isn’t extremely large (monthly unique visitors peaked at just fewer than 2,000 in October). Of course, every segment of consumers you can add to your audience helps.

Hanna said that existing Fantasy City users shouldn’t see much change in their experience other than the host. He said that people can still log in through the FCS site and will be redirected to RTSports.com, where they should find their league settings transferred over.

“All the users need to do is input their 2009 fantasy football league schedule and they are set to go,” Hanna said. “Yes, there is some learning curve involved, but we feel it will not be extensive and the customers will love all the new features.”

Hanna also pointed out that the cost will be lower than what Fantasy City users paid in the past.