|o Total||5.87 km2 (2.27 sq mi)|
|Elevation||455 m (1,493 ft)|
|o Density||1,000/km2 (2,600/sq mi)|
|Time zone||UTC+01:00 (Central European Time)|
|o Summer (DST)||UTC+02:00 (Central European Summer Time)|
|Surrounded by||Buchs, Niederhasli, Regensberg, Steinmaur|
Dielsdorf is first mentioned in 861 as Theolvesthoruf. The name means estate or farm of Theolf which is supposed to have been the original owner of these lands.
Dielsdorf has an area of 5.9 km2 (2.3 sq mi). Of this area, 37% is used for agricultural purposes, while 30.2% is forested. Of the rest of the land, 31% is settled (buildings or roads) and the remainder (1.9%) is non-productive (rivers, glaciers or mountains).
Dielsdorf has a population (as of 31 December 2019) of 5,966. As of 2007 , 22.5% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 14.8%. Most of the population (as of 2000 ) speaks German (84.2%), with Italian being second most common ( 4.0%) and Albanian being third ( 2.7%).
Dielsdorf has an unemployment rate of 3.22%. As of 2005primary economic sector and about 14 businesses involved in this sector. 894 people are employed in the secondary sector and there are 55 businesses in this sector. 2471 people are employed in the tertiary sector, with 229 businesses in this sector., there were 40 people employed in the
The historical population is given in the following table: