Ursenbach has a population (as of December 2018) of 896.
 As of 2010, 3.5% of the population are resident foreign nationals.
 Over the last 10 years (2000-2010) the population has changed at a rate of 1.3%.
 Migration accounted for 0.7%, while births and deaths accounted for -1.3%.

Most of the population (as of 2000) speaks German (887 or 98.6%) as their first language, Serbo-Croatian is the second most common (6 or 0.7%) while French and Italian are the third, each with 2 people.

As of 2008, the population was 48.1% male and 51.9% female.
 The population was made up of 428 Swiss men (46.0% of the population) and 19 (2.0%) non-Swiss men.
 There were 469 Swiss women (50.4%) and 14 (1.5%) non-Swiss women.
 Of the population in the municipality, 415 or about 46.1% were born in Ursenbach and lived there in 2000.
 There were 363 or 40.3% who were born in the same canton, while 73 or 8.1% were born somewhere else in Switzerland, and 26 or 2.9% were born outside of Switzerland.

As of 2010, children and teenagers (0–19 years old) make up 24.8% of the population, while adults (20–64 years old) make up 57% and seniors (over 64 years old) make up 18.2%.

As of 2000, there were 373 people who were single and never married in the municipality.
 There were 464 married individuals, 52 widows or widowers and 11 individuals who are divorced.

As of 2000, there were 87 households that consist of only one person and 37 households with five or more people.
 In 2000, a total of 318 apartments (84.8% of the total) were permanently occupied, while 37 apartments (9.9%) were seasonally occupied and 20 apartments (5.3%) were empty.
 The vacancy rate for the municipality, in 2011, was 0.69%.

The historical population is given in the following chart:
Ursenbach has a population (as of December 2018) of 896.  As of 2010, 3.5% of the population are resident foreign nationals.  Over the last 10 years (2000-2010) the population has changed at a rate of 1.3%.  Migration accounted for 0.7%, while births and deaths accounted for -1.3%.
Most of the population (as of 2000) speaks German (887 or 98.6%) as their first language, Serbo-Croatian is the second most common (6 or 0.7%) while French and Italian are the third, each with 2 people.
As of 2008, the population was 48.1% male and 51.9% female.  The population was made up of 428 Swiss men (46.0% of the population) and 19 (2.0%) non-Swiss men.  There were 469 Swiss women (50.4%) and 14 (1.5%) non-Swiss women.  Of the population in the municipality, 415 or about 46.1% were born in Ursenbach and lived there in 2000.  There were 363 or 40.3% who were born in the same canton, while 73 or 8.1% were born somewhere else in Switzerland, and 26 or 2.9% were born outside of Switzerland.
As of 2010, children and teenagers (0–19 years old) make up 24.8% of the population, while adults (20–64 years old) make up 57% and seniors (over 64 years old) make up 18.2%.
As of 2000, there were 373 people who were single and never married in the municipality.  There were 464 married individuals, 52 widows or widowers and 11 individuals who are divorced.
As of 2000, there were 87 households that consist of only one person and 37 households with five or more people.  In 2000, a total of 318 apartments (84.8% of the total) were permanently occupied, while 37 apartments (9.9%) were seasonally occupied and 20 apartments (5.3%) were empty.  The vacancy rate for the municipality, in 2011, was 0.69%.
The historical population is given in the following chart:
Ursenbach