Webresearch rental market trends in louisville, ky. See the average rent, monthly and annual rent changes and compare rental costs across locations. Webaccording to zillow group, the rental market in louisville is steadily growing. Renters occupy 40% of the housing units, and the rental vacancy rate is. Annual rent increases are highest in hartford (7. 8%), cleveland (7. 2%), louisville (6. 8%),.