Unterlunkhofen has a population (as of ) of . , 10.2% of the population was made up of foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 23%. Most of the population () speaks German (94.6%), with Italian being second most common ( 1.0%) and English being third ( 1.0%). The age distribution, , in Unterlunkhofen is; 141 children or 11.2% of the population are between 0 and 9 years old and 158 teenagers or 12.5% are between 10 and 19. Of the adult population, 149 people or 11.8% of the population are between 20 and 29 years old. 172 people or 13.6% are between 30 and 39, 249 people or 19.7% are between 40 and 49, and 203 people or 16.1% are between 50 and 59. The senior population distribution is 118 people or 9.4% of the population are between 60 and 69 years old, 56 people or 4.4% are between 70 and 79, there are 12 people or 1.0% who are between 80 and 89, and there are 3 people or 0.2% who are 90 and older. , there were 22 homes with 1 or 2 persons in the household, 210 homes with 3 or 4 persons in the household, and 225 homes with 5 or more persons in the household. The average number of people per household was 2.61 individuals. There were a total of 8 empty apartments for a 1.5% vacancy rate. , there was no new construction of housing units. In the
2007 federal election the most popular party was the
SVP which received 35.4% of the vote. The next three most popular parties were the
CVP (22.2%), the
SP (15.7%) and the
FDP (11.9%). In Unterlunkhofen about 86.4% of the population (between age 25-64) have completed either non-mandatory
upper secondary education or additional higher education (either university or a
Fachhochschule). Of the school age population (), there are 99 students attending
primary school in the municipality. The historical population is given in the following table: ==Heritage sites of national significance==