I have remodeled a bathroom and replaced carpet floors with hardwood. This now puts the toilet flange below the floor level. Is there a thicker or additional flange to bring the connection (with the toilet) level up 1/2 to 3/4 inches?

You can build up the closet flange with these (http://www.quickfixplumbingproducts.com/closet%20flange%20extenders.htm).

You can also use 2 wax flanges to fill the difference. Just stack the wax oon top of one another