Top 10 start up accelerators in the US:
Y Combinator > Techstars > 500 > Startups > Plug and Play > Google for Startups Accelerator > Alchemist Accelerator > Dreamit Ventures > Founders Factory > MassChallenge Startupbootcamp > AngelPad > Amplify.LA
https://startupsavant.com/best-startup-accelerators