Around one fifth of the people in the Western Isles have applied to vote by post.
Some 4,158 postal packs have been mailed locally compared to a total of 2,329 islanders who chose to vote by post in the 2010 General Election.
The size of the electorate is estimated at around 22,000.
Postal votes have to be received by the returning officer by 10pm on Thursday 7 May 2015.
People who have missed the mailing deadline can drop it off at any polling station within the islands or at the Council Offices in Stornoway.
Election starts early for over 4,000 islanders
28 April 2015