The five-time world champion retained top spot ahead of European champion Spain in Wednesday's release of the final monthly rankings before the June 11 World Cup kickoff.
Portugal is third followed by the Netherlands and world champion Italy. Germany is sixth, ahead of Argentina and England.
France moves up one to No. 9, trading places with Croatia which did not qualify for the World Cup.
The United States, at No. 14, heads up the three World Cup qualifiers from CONCACAF.
Cameroon at No. 19 is best of the six African World Cup teams, and No. 20 Australia leads Asia's four qualifiers.