The owners of Taappola Manor are known since 1530. The present main building was built in around 1900 in the villa style. It replaced an earlier main building destroyed by fire.

The history of Tammenpaa Manor dates back to the 17th century, and the owners are known since 1540. The present main building was built in 1862-1868 in the Empire style, and has been enlarged in the beginning of the 20th century. The pillars were added during the reconstruction in 1924.

The owners of Tamppi Manor are known since 1540. It became a manor in the 17th century. The present main building was built in the 1870s in a variation of Empire style.

The owners of Tervakoski Manor are known since 1539. The main building was built in the beginning of the 19th century in the neoclassical style, but was remodeled to the present form afterwards. It served as the residence for the head of Tervakoski paper mill.

Tervalampi Manor was founded in 1660, and the owners are known since 1641. The present main building was built in 1830 in the Empire style, and is believed to be designed by Carl Engel. The manor is used as a rehabilitation center at present.

The owners of Tetom Manor are known since the end of the 15th century. It belonged to Malmgard Manor in 1675-1928. The old main building from 1730 was transferred to Loviisa as a school in the beginning of the 19th century. The new main building was completed in 1938 in the modernized Empire style.

The history of Tjusterby Manor is known since the 15th century. A big stone main building from the 16th century was replaced with English Gothic-style building in 1863-1867. The tower of the new main building is octagon. The manor has a large collection of portraits. The granary was built in the 1880s.

Toivonoja Manor was founded in 1783 when Sipila was divided into Sipila and Toivonoja. The oldest parts of the present main building date from 1807, and the current Neo-Renaissance appearance dates from 1876.

The history of Tuorlahti Manor dates back to medieval times, and the owners are known since the end of the 15th century. The present main building was built after the earlier main building was destroyed by fire in 1902.