I found a county that has downloadable link for GIS data. When I unzip the file I see main file is: data.rar. Is there specific program to open that file type or is there way to import it into google earth? I am hoping this GIS data shows parcel lines.
Google Earth will show parcel lines and it is probably more updated data than any county system out there
An .rar file is another compressed file just like a zip file. I don't know why they would put an .rar file inside a .zip file though. When your dealing with GIS files that you can use with Google Earth, you'll want to be looking .kml or .kmz (just a zipped .kml file). If you see a reference to a shapefile, or .shp files, you would need to have a more professional GIS program like QGIS or ESRI's ArcMap.
Most counties will be using web based user friendly parcel viewers. You should only need to download a viewer. Anything is will be for more sophisticated uses. Try the links through each counties assessor.