I have attached the excel file for impact factor 2014 which are released in 18 June 2015. Impact factors (2015) will be available in June 2016.

In addition to the excel file, you may find the following links useful:

http://admin-apps.webofknowledge.com/JCR/static_html/notices/notices.htm

http://www.bioxbio.com/if/

http://www.annualreviews.org/page/about/isi-rankings

http://scholarlykitchen.sspnet.org/2015/06/18/2014-journal-impact-factors/

From JCR website. But your institute should have access to this website. 

Dear @Raju, here are the information that you are looking for. Regards.

http://www.library.up.ac.za/journals/docs/ISI.pdf

http://www.eur.nl/ub/en/news/newsdetails/article/74416-journal-citation-reports-2015-have-been-released/

http://www.sciencegateway.org/impact/

I have attached the excel file for impact factor 2014 which are released in 18 June 2015. Impact factors (2015) will be available in June 2016.

In addition to the excel file, you may find the following links useful:

http://admin-apps.webofknowledge.com/JCR/static_html/notices/notices.htm

http://www.bioxbio.com/if/

http://www.annualreviews.org/page/about/isi-rankings

http://scholarlykitchen.sspnet.org/2015/06/18/2014-journal-impact-factors/

And, just to complement the other excellent answers, here is the link to JCR itself (valid subscription required):

http://www.isiknowledge.com/JCR

Thank you all

Now available journal list of Thomson Reuters 2015 Impact Factor, released in 14 June, 2016. You can see it in this link https://jcr.incites.thomsonreuters.com/JCRJournalHomeAction.action?

Impact Factor List 2015  with IF for previous period 2011-2014 is given.

http://www.citefactor.org/journal-impact-factor-list-2015.html

2017 Journal Impact Factor has been released on 26 June 2018. You can find it in this link http://jcr.incites.thomsonreuters.com/JCRHomePageAction.action?.

Cheers

Basanta Paudel