From a small settlement of three families in 1792, Tecumseh, then known as Ryegate, has become a prosperous and flourishing community. In 1912, Ryegate was renamed Tecumseh in honour of Tecumseh, a Shawnee Warrior who was killed at battle in the War of 1812. The creation of Tecumseh Road in 1838 and the establishment of the Great Western Railway opened up the area for settlement. The Town became an important railway depot and stopover for travellers. County residents took horse and buggy into Tecumseh and then transferred onto the train, journeying by rail the rest of the way into Windsor. Several popular hotels were started in Tecumseh to accommodate travellers. The Bedell Hotel, the Soulliere Inn, the Hebert and the Hotel Perreault were some of the places most frequented by travellers and locals alike.
The French were for the most part the original settlers of Tecumseh, the majority of them descendants of the Frenchmen who had established their seigneural land holdings along the banks of the river in the 1700's.
As the Town of Windsor grew, Tecumseh began to experience new blood when the overflow of immigrants coming to the city began to settle in the peripheral regions as well. Indicative of the change was the mix-up created by the introduction of the tomato to the area of Tecumseh. Many of the English residents of the community refused to touch the suspicious red vegetable believing it to be a "Love Potion" concocted by the amorous Frenchmen. The first post office was located on the northeast corner of Tecumseh and Lesperance and was operated by a Mr. Christie. Some of the first businesses in Tecumseh included a lumber mill operated by J. B. Cada; a grocery store operated by Arthur Cecile; a cheese factory on Banwell Road operated by Joseph Breault; a bakery owned by John Dugell; three butcher shops; a canning factory and a brewery eventually closed under Carling Company. In 1921, it was felt that Tecumseh was not getting its fair share of improvements in proportion to the taxes paid to the municipality of Sandwich East. A group of people headed by Malcolm Clapp petitioned the legislature to separate from the township and incorporate as the Town of Tecumseh with a population of 978. Dr. Paul Poisson was appointed as the first mayor of the town. The real growth in Tecumseh occurred in 1931 with the establishment of the Green Giant Factory as Fine Foods of Canada. Green Giant (now Carriere) is still located in Tecumseh and continues to employ full and part time workers.
As the population grew, so did the demands for services. The Ontario Provincial Police started policing the Town in 1948 with 2 officers. In 1922, a fire chief was appointed although no fire department was in existence, the fires were fought by town volunteers.