Important context: The United Kingdom left the European Union on 31 January 2020. As a result, Wales (and all UK nations) no longer has Members of the European Parliament (MEPs).
In the 2019 European Parliament election (held 23 May 2019), Wales elected 4 MEPs from a single Wales constituency (using D'Hondt proportional representation):
They served until UK departure on 31 Jan 2020 (approx. 8 months).
Reduction from 5 to 4 in 2004 followed EU enlargement and reapportionment.
Wales is now represented in:
The "4 MEPs from 4 electoral regions" description in some sources is incorrect — Wales was a single multi-member constituency for its entire EU membership.