@GWicke While 4,857,103 includes redirects sorting by the titles shows the last title of an article in the database is Sam_Tung_Uk_Museum and querying for the title "Water" or "U2" does not return anything. I think all the articles after Sam_Tung_Uk_Museum are missing.

$ sqlite3 en.wikipedia.org.articles.ns0.sqlite3 
SQLite version 3.6.20
sqlite> select count(title) from data where (title="Water");
0
sqlite> select count(title) from data where (title="U2");
0
sqlite> select count(title) from data where (title="Sam_Tung_Uk_Museum");
1

@GWicke Great work but I think en.wikipedia.org.articles.ns0.sqlite3 is incomplete, the current article count is 4,857,103: