Does anyone know where I can find figures for the total votes cast by party in the US 2018 House elections? I've been unable to locate them.
We don't yet know the actual final results, as there are still some races that are actively being counted. This page on The Green Papers has all the publicly announced Unofficial numbers collected in one place.
Democrat - 54,375,285 (51.98%) Republican - 48,571,844 (46.43%) Other Parties - 1,667,746 ( 1.58%)
These numbers will probably change in the next week or two as official tallies are released, but they're probably accurate to within 50,000 of the final numbers. (Warning: gut feeling estimate, not based on any research.)