The municipality is one of few in Sweden which has approximately the same size as the original entity created out of Täby parish, when the first local government acts came into force in 1863.

Täby is one of the wealthiest municipalities in Sweden, with the 2nd highest median income per capita.

The cross on Täby's coat of arms is found on the Risbylestenen, a runestone, in the northern part of the municipality.

Other noble families owning land in Täby at different times during this period were Banér, Bååth, Roos, Sparre, Gyllenstierna and Meijerfeldt.

In 1902 the wealthy engineer Carl Robert Lamm (1856–1938), acquired the burned down Näsby Manor and rebuilt it.

[18] Around the time of the First World War many city dwellers in Stockholm acquired small summer residences in the eastern part of Täby, what is now the district of Näsbypark.

In 1948 Täby acquired the title of a "merchant town" (Swedish: köping), valid until the reform of 1971.

This was also the beginning of the large scale development of Täby, led by the mayor Gustaf Berg.

[19] Today, Täby is considered an attractive suburb to Stockholm with one of the highest median incomes in Sweden.

Filippa Reinfeldt, ex-wife of Fredrik Reinfeldt (the former Swedish Prime Minister and former leader of the Moderate Party), had been mayor of Täby for a long time, until Jan Rosenberg, of the Moderate Party,[20] became the current mayor of Täby Municipality.