Four of the state assembly races were close enough to trigger a recount, but so far it looks like the Republicans will win all four. So, the Republicans will have a one seat advantage in the state legislature.
I can't find a graphic of the election results by county in VA, but it basically mirrored the presidential election. All the rural counties went for Gillespie, and Northam crushed it in the DC suburbs, Richmond, Hampton/Norfolk, Charlottesville, Lynchburg, and a few smaller college towns. So, I think the Republicans will maintain their edge in the state assembly for years to come, but will struggle to ever again have a Republican senator.