Tumba is a bimunicipal locality and the seat of Botkyrka Municipality in Stockholm County, Sweden with 37,852 inhabitants in 2010.

[1] A part of its statistical urban area, called Rönninge, is in Salem Municipality.

What makes Tumba different from the communities in northern Botkyrka is that it doesn’t stem from a big farm with historic roots.

The big change took place during 1755 when the bank of Sweden bought a small farm and started a paper mill.

In 1894 ‘Separator’ (DeLaval) bought Hamra gård and transformed it into a farm specialized in milk processing.