On 19 Nov 1888 Edward Berkeley Fitzharding 1st Viscount Portman (age 89) died. His son Henry Fitzharding 2nd Viscount Portman (age 59) succeeded 2nd Viscount Portman, 2nd Baron Portman. Mary Selina Wentworth-Fitzwilliam Viscountess Portman (age 52) by marriage Viscountess Portman.

On 16 Oct 1919 Henry Fitzharding 2nd Viscount Portman (age 90) died. His son Henry Berkeley Fitzharding 3rd Viscount Portman (age 59) succeeded 3rd Viscount Portman, 3rd Baron Portman.

On 18 Jan 1923 Henry Berkeley Fitzharding 3rd Viscount Portman (age 62) died. His brother Claud Berkeley Fitzharding 4th Viscount Portman (age 58) succeeded 4th Viscount Portman, 4th Baron Portman.

On 06 Jun 1929 Claud Berkeley Fitzharding 4th Viscount Portman (age 64) died. His son Edward Claud Berkeley Fitzharding 5th Viscount Portman (age 31) succeeded 5th Viscount Portman, 5th Baron Portman. Sybil Mary Douglas Pennant Viscountess Portman (age 42) by marriage Viscountess Portman.

In 1942 Edward Claud Berkeley Fitzharding 5th Viscount Portman (age 44) died. His uncle Seymour Berkeley Fitzharding 6th Viscount Portman (age 73) succeeded 6th Viscount Portman, 6th Baron Portman.

On 02 Nov 1946 Seymour Berkeley Fitzharding 6th Viscount Portman (age 78) died. His brother Gerald Berkeley Fitzharding 7th Viscount Portman (age 71) succeeded 7th Viscount Portman, 7th Baron Portman.

On 03 Sep 1948 Gerald Berkeley Fitzharding 7th Viscount Portman (age 73) died. His son Gerald William Portman 8th Viscount Portman (age 45) succeeded 8th Viscount Portman, 8th Baron Portman.

In 1967 Gerald William Portman 8th Viscount Portman (age 64) died. His son Edward Portman 9th Viscount Portman (age 32) succeeded 9th Viscount Portman, 9th Baron Portman.

On 02 May 1999 Edward Portman 9th Viscount Portman (age 65) died. His son Christopher Portman 10th Viscount Portman (age 40) succeeded 10th Viscount Portman, 10th Baron Portman.