This page lists all peers who held extant titles between the years 1620 and 1629.
Peerage of England
Peerage of Scotland
Peerage of Ireland
References
Cokayne, George Edward, ed. (1887). Complete peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct or dormant. Vol. 1–8 (1st ed.). London: George Bell & Sons.
Cracroft-Brennan, Patrick. "Cracroft's Peerage" (web). Heraldic Media Limited. Retrieved 22 August 2013.