marquess, it appears you
have made me jump down another list-rabbit hole.
Here are the peerages, either explicit or by territorial designation, referencing Cornwall between 1801 and 2023:
1. B Erskine of Restormel
2. E of Saint Germans
3. E of Falmouth
4. B Vivian of Glynn and Truro
5. B Penzance
6. B Robartes of Lanhydrock and of Truro
7. B Saint Levan
8. B Courtney of Penwith
9. V Launceston
10. B St Just
11. B Pender
12. B Caradon of St Cleer [L]
13. B Trevelyan of Saint Veep [L]
14. B Roberthal of Silverspur… and of Trenance [L]
15. B Wolfson of Sunningdale of Trevose [L]
16. B Wolfson of Sunningdale of Trevose [L]
17. B George of St Trudy [L]
18. B Tyler of Linkinhorne [L]
19. B Teverson of Tregony [L]
20. B Myners of Truro [L]
21. B Taylor of Goss Moor of Truro [L]
22. Bss Jolly of Congdon’s Shop [L]
23. B Darroch of Kew of St Mawes [L].
S.S.
Dukedoms
1. Argyll (1701 S; 1892 UK)
2. Bedford (1414; 1478; 1485; 1694)
3. Buckingham (1444; 1623)
4. Buckingham and Chandos (1822)
5. Buckingham and Normanby (1703)
6. Cambridge (1664; 1667; 1706; 1801; 2011)
7. Chester (1067; 1071; 1254; 1301; 1312 and later with the Principality of Wales in 1399, 1454, 1471, 1483, 1489, 1504, 1537, 1610, 1616, 1688, 1714, 1728, 1751, 1762, 1841, 1901, 1910, 1958, 2022 etc)
8. Cornwall (1068; 1072; 1106; 1140; 1141; 1225; 1307; 1330 etc)
9. Cumberland (1644; 1689; 1726)
10. Cumberland and Strathearn (1766)
11. Cumberland and Teviotdale (1799)
12. Devonshire (1694)
13. Dorset (1719)
14. Fife (1889; 1900)
15. Gloucester (1385; 1414; 1461; 1659; 1928)
16. Gloucester and Edinburgh (1764)
17. Hereford (1397)
18. Inverness (1840)
19. Kent (1710)
20. Lancaster (1351; 1362; 1399)
21. Leinster (1691 I; 1766 I)
22. Monmouth (1663)
23. Munster (1716 I)
24. Norfolk (1397 twice; 1477; 1483)
25. Northumberland (1551; 1683; 1766)
26. Richmond and Somerset (1525)
27. Ross (1488)
28. Roxburghe (1707 S)
29. Rutland (1703)
30. Somerset (1443; 1448; 1499; 1547)
31. Southampton (1675)
32. Suffolk (1448; 1514; 1551)
33. Surrey (1397
34. Sussex (1801; 2018)
35. Sutherland (1833)
36. Warwick (1445)
37. York (1385; 1474; 1494; 1605; 1644; 1892; 1920; 1986)
38. York and Albany (1716; 1760; 1784)
Marquessates
1. Aberdeen and Temair (1916)
2. Anglesey (1815)
3. Angus and Abernethy (1703 S)
4. Antrim (1645 I; 1789 I)
5. Argyll (1641 S)
6. Bristol (1826)
7. Buckingham (1618; 1784)
8. Bute (1796)
9. Cambridge (1706; 1917)
10. Carmarthen (1689)
11. Carnarvon (1719)
12. Dorset (1397; 1442; 1475)
13. Downshire (1789 I)
14. Dumfriesshire (1684 S)
15. Fife (1567 S)
16. Hertford (1641)
17. Kent (1706)
18. Kildare (1761 I)
19. Lincolnshire (1912)
20. Linlithgow (1902)
21. Londonderry (1816 I)
22. Lothian (1701 S)
23. Northampton (1547; 1812)
24. Pembroke (1532)
25. Powis (1687)
26. Sligo (1800 I)
27. Somerset (1397
28. Stafford (1786)
29. Suffolk (1444
30. Waterford (1789 I)
31. Westmeath (1822 I)
32. Wigtown (1602 S)
33. Worcester (1643)
Earldoms
1. Aberdeen (1682 S)
2. Anglesey (1623; 1661)
3. Angus (1330 S; 1389 S; 1633 S)
4. Antrim (1620 I; 1785 I)
5. Argyll (1457 S)
6. Armagh (1799 I)
7. Bedford (1138; 1366; 1550)
8. Berkshire (1621; 1626)
9. Brecknock (1660)
10. Bristol (1622; 1714)
11. Buckingham (1097; 1164; 1377; 1617; 1618)
12. Buckinghamshire (1746)
13. Bute (1703 S)
14. Caithness (1334 S; 1375 S; 1452 S; 1455 S)
15. Cambridge (1340; 1362; 1414; 1619; 1659; 1664)
16. Cardigan (1661)
17. Carnarvon (1628; 1714; 1793)
18. Cork (1396 I; 1620 I)
19. Cornwall (multiple creations)
20. Cromartie (1703 S)
21. Cromartie (1861)
22. Cumberland (1525)
23. Derby (1138; 1337; 1385; 1485)
24. Devon (1100; 1469; 1485; 1553)
25. Devonshire (1603; 1618)
26. Dorset (1070; 1411; 1441; 1603)
27. Downe (1628 I)
28. Dublin (1766 I; 1799 I)
29. Dumbarton (1675 S)
30. Dumfries (1633 S)
31. Essex (1139; 1199; 1227; 1376; 1461; 1540; 1543; 1572; 1661)
32. Fife (1107 S; 1120 S; 1129 S; 1759 I; 1885)
33. Forfar (2019)
34. Galway (1697 I)
35. Glamorgan (1644?)
36. Gloucester (1093; 1121; 1299; 1337; 1397)
37. Haddington (1619)
38. Hereford (1043; 1052; 1058; 1067; 1141; 1199)
39. Hertford (1138;1299; 1537; 1599; 1750)
40. Huntingdon (1065; 1337; 1377; 1387; 1471; 1479; 1529)
41. Inverness (1801; 1892; 1920; 1986)
42. Kent (1067; 1141; 1227; 1321; 1360; 1461; 1465; 1866)
43. Kerry (1723 I)
44. Kildare (1316 I; 1554 I)
45. Kilkenny (1793 I)
46. Lanark (1639 S)
47. Lancaster (1267)
48. Leicester (1107; 1206; 1265; 1564; 1618; 1744; 1784; 1837)
49. Leinster (1646 I; 1721 I)
50. Leitrim (1795 I)
51. Limerick (1686 I; 1803 I)
52. Lincoln (1141; 1143; 1147; 1217; 1232; 1349; 1467; 1525; 1572)
53. Linlithgow (1600 S)
54. Londonderry (1622 I; 1726 I; 1796 I)
55. Longford (1677 I; 1785 I)
56. Lothian (1606 S; 1631 S)
57. Louth (1319 I; 1759 I)
58. Mayo (1785 I)
59. Meath (1627 I)
60. Middlesex (1622; 1675)
61. Midlothian (1911)
62. Monmouth (1626; 1689)
63. Montgomery (1605)
64. Moray (1314 S; 1359 S; 1501 S; 1562 S)
65. Munster (1789 I)
66. Norfolk (1140; 1312; 1644)
67. Northampton (1065; 1337; 1604; 1618)
68. Northumberland (1377; 1467; 1557; 1674; 1749)
69. Nottingham (1377; 1383; 1476; 1483; 1525; 1596; 1681)
70. Oxford (1141)
71. Oxford and Asquith (1925)
72. Oxford and Earl Mortimer (1711)
73. Pembroke (1138; 1189; 1247; 1339; 1414; 1453; 1468; 1479; 1551)
74. Perth (1605 S)
75. Radnor (1679)
76. Ross (1157 S; 1215 S; 1481 S; 1565 S; 1600 S)
77. Roxburghe (1616 S)
78. Rutland (1390; 1525)
79. Selkirk (1646 S)
80. Somerset (1141?; 1397; 1613)
81. Southampton (1537; 1547; 1670)
82. Stafford (1351; 1688; 1688)
83. Stirling (1633 S)
84. Suffolk (1337; 1385; 1603)
85. Surrey (1088; 1451; 1483)
86. Sussex (1282; 1529; 1628; 1644; 1674; 1717; 1874)
87. Tipperary (1801)
88. Tyrone (1542 I; 1673 I; 1746 I)
89. Ulster (1205 I; 1264 I; 1659 I; 1716 I; 1760 I; 1784 I; 1866; 1928)
90. Warwick (1088; 1246; 1449; 1472; 1547; 1561; 1618; 1759)
91. Waterford (1446 I)
92. Westmeath (1621 I)
93. Westmorland (1397; 1624)
94. Wicklow (1793 I)
95. Wigtown (1606 S)
96. Wiltshire (1397; 1449; 1470; 1510; 1529; 1550)
97. Worcester (1138; 1397; 1421; 1449; 1514)
S.S.
Additionally, by looking at Sir David Beamish’s website (all peerages between 1801 and 2023) and doing a quick Ctrl+F, we can find the following territorial designations used (note that this has been done rather roughly since some county names used are after the local governmental reforms and thus make counting in a perfunctory manner much harder):
Bedfordshire (16)
Berkshire (23)
Bristol (9)
Buckinghamshire (61)
Cambridgeshire (29)
Cheshire (30)
co Durham (~22)
Cornwall (22)
Cumbria (16)
Derbyshire (28)
Devonshire (50)
Dorset (32)
Essex (62)
Gloucestershire (54)
Hampshire (~95)
Herefordshire (18)
Hertfordshire (48)
Kent (~108)
Lancashire (~78)
Leicestershire (22)
Lincolnshire (~31)
Northamptonshire (27)
Northumberland (44)
Nottinghamshire (22)
Oxfordshire (69)
Rutland (4)
Shropshire (34)
Somersetshire (45)
Staffordshire (35)
Suffolk (46)
Surrey (108)
Sussex (74)
Warwickshire (32)
Wiltshire (44)
Worcestershire (12)
Yorkshire (~81)
Surrey probably takes the cake in the period between 1801 and 2023 at 108 peerages. The least is poor Rutland at just 4.
S.S.