None, but Everton have lasted the longest among the clubs currently in the EPL.
Everton were relegated in the late 1920's and again in the early 50's. Arsenal are actually the longest running club in the EPL, having been voted into the top division in 1919 and never having been relegated since.
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"Manchester United is the only team I know that has never been out of the prem"
That answer is incorrect, the only team never to have been relelgated out of the "TOP" league in English Football is Arsenal. Manchester United have only been in the top flight since relegation for 36 years.
I think that club called sheffield or something. Maybe or maybe not i might be wrong but atleasti tryed lol.