Currently, the Manga is still being published, and the Anime quite a bit behind the Manga. So there is no real way to tell when, or at what number the last chapter/episode will be.
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The last naruto episode (not shippuden) is Naruto Episode 220
The last Naruto Shippuden episode is episode 64
I am thinking that it is Naruto episode 79 the last episode of 4th season.
there is no last
The last episode of Naruto part 1 aired several years ago, but as for Shippuden, it is still running.