Easements are typically recorded in the Office of the Marion County Recorder. However, researching them can be a difficult task unless you have information such as the names of the parties to the easement, the approximate date it was created, and the address, parcel number or section, township and range where it is located. The utility company, government or business entity, individual, etc. who the easement was granted to may be able to provide a copy of an easement document.
A recorded survey (if any) of the property may show easements if they were provided to the surveyor.
If you have a prior title insurance policy it may list the easements on the property. Otherwise, title insurance companies may be able to do easement research for a fee.