The four sites are considered "suitable and mutually beneficial", the Presidential Communications Office said in a statement.
It added that the bases would also be used for humanitarian and relief operations during disasters.
The long-time treaty allies agreed in February to expand cooperation in "strategic areas" of the country as they seek to counter China's growing assertiveness over Taiwan and its building of bases in the South China Sea.
The 2014 Enhanced Defence Cooperation Agreement (EDCA) gave US forces access to five bases in the Philippines.
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