Viscount Montgomery of the Great Ardes 1622 Montgomery extinct 1757
Viscount Valentia 1622 Annesley extant
Viscount Somerset 1626 Somerset extinct 1649
Viscount Baltinglass 1627 Roper extinct 1672
Viscount Castleton 1627 Saunderson extinct 1723 created Viscount Castleton again in 1716 and Earl Castleton in 1720.
Viscount Chaworth 1628 Chaworth extinct 1693
Viscount Scudamore 1628 Scudamore extinct 1716
Viscount Molyneux 1628 Molyneux created Earl of Sefton 1771 extinct 1972
Viscount Strangford 1628 Smythe extinct 1869 created Baron Penshurst (UK) in 1825
Viscount Wenman 1628 Wenman extinct 1800
Viscount Fitzwilliam 1629 Fitzwilliam extinct 1833 created Earl of Tyrconnel in 1661, extinct 1667
Viscount Clanmalier 1631 O'Dempsey extinct 1691
Viscount Cullen 1642 Cokayne, Bertie extinct 1938 merged with Earl of Lindsay 1810
Viscount Carrington 1643 Smyth extinct 1706
Viscount Tracy 1643 Tracy extinct 1797
Viscount Bulkeley 1644 Bulkeley extinct 1822 also Baron Bulkeley in the Peerage of Great Britain from 1784
Viscount Bellomont 1645 Bard extinct 1667
Viscount Brouncker 1645 Brouncker extinct 1688
Viscount Barnewall 1646 Barnewall extinct 1834 dormant from 1800 to 1814
Viscount Tara 1650 Preston extinct 1674
Viscount Dungannon 1662 Trevor extinct 1706
Viscount Shannon 1660 Boyle extinct 1699
Viscount Massereene 1660 Clotworthy,Skeffington extant also Viscount Ferrard after 1831
Viscount Cholmondeley 1661 Cholmondeley extant created Earl of Cholmondeley in 1706 in the Peerage of England and in 1815 Marquess of Cholmondeley in the Peerage of the United Kingdom
Viscount Clare 1662 O'Brien extinct 1774
Viscount Charlemont 1665 Caulfeild extant created Earl of Charlemont in 1763; that title extinct 1892
Viscount Powerscourt 1665 Wingfield extinct 1717
Viscount Blessington 1673 Boyle extinct 1732
Viscount Downe 1675 Ducie extinct 1679
Viscount Downe 1680 Dawnay extant
Viscount Rosse 1681 Parsons extinct 1764 created Earl of Rosse 1718
Viscount Mountjoy 1683 Stewart extinct 1769 or 1829 According to The Complete Peerage, the title became extinct in 1769 on the death of William Stewart, 3rd Viscount Mountjoy. It was then re-created in 1795 for Luke Gardiner, 1st Viscount Mountjoy of Mountjoy, who is referred to in TCP as the 4th Viscount Mountjoy.
Viscount Lisburne 1685 Loftus extinct 1691
Viscount Hewett 1689 Hewett extinct 1689
Viscount Lisburne 1695 Vaughan extant created Earl of Lisburne 1776
Viscount Windsor 1699 Windsor extinct 1758
1700-1806
Viscount Howe 1701 Howe extinct 1814
Viscount Doneraile 1703 StLeger extinct 1767
Viscount Mountcashell 1706 Davys extinct 1736
Viscount Molesworth of Swords 1716 Molesworth extant
Viscount Allen 1717 Allen extinct 1845
Viscount Boyne 1717 Hamilton extant Baron Brancepeth in the Peerage of the United Kingdom from 1866
Viscount Chetwynd 1717 Chetwynd extant
Viscount Midleton 1717 Brodrick extant created Earl of Midleton in the Peerage of the United Kingdom 1920-79
Viscount Tyrconnel 1718 Brownlow extinct 1754
Viscount Fane 1718 Fane extinct 1766
Viscount Grimston 1719 Grimston extant created Baron Verulam in 1790 created Earl of Verulam in 1815 all in the Peerage of Great Britain
Viscount Barrington 1720 Barrington extinct 1990 created Baron Shute in the Peerage of the United Kingdom in 1880
Viscount Blundell 1720 Blundell extinct 1756
Viscount Gage 1720 Gage extant
Viscount Vane 1720 Vane extinct 1789
Viscount Clanmaurice 1723 Fitzmaurice extant subsidiary title of the Earl of Kerry, also Marquess of Lansdowne in the Peerage of Great Britain from 1818