In this spreadsheet we share domains linked in the UK EU membership referendum tweet collection. Counts for links by leave voters and remain voters are given, enabling sites to be understood in terms of their partisan appeal. The hashtags that were used to identify leave and remain voters are also given. The method by which the hashtags were used to identify voters is given in Gorrell et al, 2018, "Quantifying Media Influence and Partisan Attention on Twitter during the UK EU Referendum".