Ponte Tresa has a population (as of December 2011) of 776. As of 2008, 27.3% of the population are resident foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 3.5%.
Most of the population (as of 2000) speaks Italian (79.8%), with German being second most common (13.3%) and French being third (2.6%). Of the Swiss national languages (as of 2000), 102 speak German, 20 people speak French, 614 people speak Italian, and 4 people speak Romansh. The remainder (29 people) speak another language.
As of 2008, the gender distribution of the population was 45.6% male and 54.4% female. The population was made up of 251 Swiss men (31.1% of the population), and 117 (14.5%) non-Swiss men. There were 332 Swiss women (41.1%), and 107 (13.3%) non-Swiss women.
In 2008 there were 7 live births to Swiss citizens and 1 birth to non-Swiss citizens, and in same time span there were 9 deaths of Swiss citizens. Ignoring immigration and emigration, the population of Swiss citizens decreased by 2 while the foreign population increased by 1. There was 1 Swiss man and 6 Swiss women who immigrated back to Switzerland. At the same time, there were 11 non-Swiss men and 10 non-Swiss women who immigrated from another country to Switzerland. The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was a decrease of 9 and the non-Swiss population change was an increase of 13 people. This represents a population growth rate of 0.5%.
The age distribution, as of 2009, in Ponte Tresa is; 50 children or 6.2% of the population are between 0 and 9 years old and 76 teenagers or 9.4% are between 10 and 19. Of the adult population, 60 people or 7.4% of the population are between 20 and 29 years old. 108 people or 13.4% are between 30 and 39, 154 people or 19.1% are between 40 and 49, and 99 people or 12.3% are between 50 and 59. The senior population distribution is 106 people or 13.1% of the population are between 60 and 69 years old, 99 people or 12.3% are between 70 and 79, there are 55 people or 6.8% who are over 80.
As of 2000, there were 373 private households in the municipality, and an average of 2. persons per household. In 2000 there were 62 single family homes (or 33.9% of the total) out of a total of 183 inhabited buildings. There were 31 two family buildings (16.9%) and 67 multi-family buildings (36.6%). There were also 23 buildings in the municipality that were multipurpose buildings (used for both housing and commercial or another purpose).
The vacancy rate for the municipality, in 2008, was 0.88%. In 2000 there were 544 apartments in the municipality. The most common apartment size was the 3 room apartment of which there were 173. There were 37 single room apartments and 78 apartments with five or more rooms. Of these apartments, a total of 368 apartments (67.6% of the total) were permanently occupied, while 161 apartments (29.6%) were seasonally occupied and 15 apartments (2.8%) were empty. As of 2007, the construction rate of new housing units was 1.2 new units per 1000 residents.
The historical population is given in the following chart:
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