Search area 20 of the Louisville MLS on Semonin.com which is also known as Oldham County Kentucky real estate north because these listings are updated daily. Oldham County is northeast of Louisville Kentucky with the northern border of the county being the Ohio River. The county is split in half by Interstate 71 which runs in a northeast/southwest compass heading. Area 20 contains all the real estate north of the Interstate 71. This area ranges from very high priced subdivisions in the Prospect area to older spacious local farms and houses along US highway 42. The county seat of LaGrange and largest community is located in the northern section of the county. Other communities like Goshen and Buckner offer a very wide range of real estate choices from large horse farms to small starter homes. Oldham County is often called a bedroom community of Louisville due to the closeness of driving into the Greater Louisville area for work while living and sleeping in a more country setting.