Where is South Riding Virginia? What County is South Riding in

The town of South Riding belongs (from oldest to youngest) to the state of Virginia and Loudoun County.

The English name of the town is South Riding.

Is South Riding in Fairfax County?
Is South Riding VA a good place to live?
Is South Riding the same as Chantilly VA?
How many homes are in South Riding Virginia?