Countess of Harcourts first voyage transporting convicts took place in 1821. Under the command of George Bunn, with surgeon Morgan Price, she sailed from Portsmouth on 19 April and arrived at
Hobart Town on 27 July 1821. Contrary winds prevented her entering the Derwent two days earlier. As it was, the journey took only 99 days, which remained a record until 1837. She carried 172 male convicts, none of whom died during the voyage.
Countess of Harcourt was at Batavia around 24 October 1821, from where she returned to England. On her second voyage transporting convicts, Captain Bunn and surgeon Robert Armstrong left
Cork on 3 September 1822 and arrived at Port Jackson on 22 December.
Countess of Harcourt carried 172 convicts, one of whom died on the voyage. One officer and 30 other ranks from the
3rd Regiment of Foot provided the guards.
Countess of Harcourt returned to London via Batavia. After she arrived in
The Downs, the captain went to London, where the owners directed her to Rotterdam. Three seaman refused to work on the voyage to Rotterdam, but claimed their wages for that part of the voyage. The result was a case in the High Court of Admiralty, which ruled that the inclusion of the words "and elsewhere" after the words "London, Van Dieman's Land via Cork" did not entitle the owners to extend the voyage once she had returned to London. The Court found in favour of the mariners and the owners were ordered to pay costs and wages. On her third voyage transporting convicts, she was under the command of George Bunn, with surgeon J. Dickson. She sailed from
The Downs on 23 March 1824, and arrived at
Port Jackson on 12 July. She carried 174 or so male convicts; one convict died during the voyage One officer and 36 other ranks from the
40th Regiment of Foot provided the guards.
Countess of Harcourt left Port Jackson on 24 August with supplies and in company with and . The 3rd Regiment of Foot provided a detachment of soldiers. The three ships were sailing to
Port Essington to form a new settlement there. Port Essington proved unsatisfactory, and the expedition established a settlement at
Fort Dundas. On 13 November 1824
Countess of Harcourt and
Tamar departed.
Countess of Harcourt sailed first to
Isle de France (Mauritius), and from there to Britain. For her next voyage,
Countess of Harcourt was under charter to the EIC; her managing owner was George Frederick Young. Under the command of Captain Thomas Delafone (or Delaphon, or Delaphous), she left
The Downs on 25 June 1825, bound for China and Nova Scotia. She reached
Whampoa anchorage on 6 December. She crossed the Second Bar on 24 January 1826, and reached
St Helena on 19 April. By 29 May she was at
Halifax, Nova Scotia. She returned to her mooring in Britain on 13 August. The fourth voyage transporting convicts took place under the command of William Harrison, with surgeon Michael Goodsir. She sailed from
Dublin, Ireland, on 14 February 1827 and arrived at Port Jackson on 28 June. She carried 194 male convicts, two of whom died during the voyage. In 1827
Countess of Harcourt was sold to Kains & Co., London. She was advertised as leaving Sydney in August, bound for
Île de France. On her fifth voyage transporting convicts,
Countess of Harcourt was under the command of William Harrison, with surgeon John Drummond. She sailed from London on 3 May 1828, and arrived at Port Jackson on 8 September 1828. She carried 184 male convicts, none of whom died during the voyage. ==''Lloyd's Register''==