Now that Brexit happened, is UK still in the EEA?
As of 23:00 GMT on 31 January 2020, the UK is no longer a member of the European Union.
But there is a 'transition period' or 'implementation period' until 31 December 2020. During this period the UK is 'in' the EU single market and customs union.
For practical purposes it is 'in' the EEA until 31 December 2020.
By the way, Switzerland is not a member of the EEA but it is in the EU single market.