Although the first results in other parts of the country are expected before midnight, counting in Sussex is not expected to finish until after 3am on Friday morning.
The Electoral Commission has released a short guide on voting in person, which includes advice on what to do and not to do at polling stations today.
Polls close at 10pm tonight.
For rolling coverage of election night, including a live blog with reporters at the counts across Sussex, check our website from 10pm onwards.
Information on candidates in constituencies across Sussex can be read by clicking the links below:
To find your constituency enter your postcode here