Before the merger, Triengen had an area of. Of this area, 65.1% is used for agricultural purposes, while 22.9% is forested. Of the rest of the land, 11.6% is settled and the remainder is non-productive. , 25.09% of the total land area was forested. Of the agricultural land, 59.06% is used for farming or pastures, while 5.57% is used for orchards or vine crops. Of the settled areas, 5.03% is covered with buildings, 0.54% is industrial, 0.72% is classed as special developments, 0.27% is parks or greenbelts and 3.4% is transportation infrastructure. Of the unproductive areas, 0.27% is unproductive flowing water and 0.05% is other unproductive land. The merged municipality has an area of
Demographics
Triengen has a population of. , 25.1% of the population was made up of foreign nationals. The combined municipality has a population of 4,295 of which 22.0% are foreign. Over the last 10 years the population has grown at a rate of 8.4%, while the merged municipality has grown at a slower 6.2%. Most of the population speaks German , with Albanian being second most common and Portuguese being third. In the 2007 election the most popular party was the FDP which received 33.4% of the vote. The next three most popular parties were the CVP, the SVP and the SPS. The age distribution in Triengen is; 1,167 people or 27% of the population is 0–19 years old. 1,177 people or 27.3% are 20–39 years old, and 1,417 people or 32.8% are 40–64 years old. The senior population distribution is 413 people or 9.6% are 65–79 years old, 112 or 2.6% are 80–89 years old and 32 people or 0.7% of the population are 90+ years old. The merged age distribution is 0–19 years old make up 28.0% of the population, 20–64 years old make up 59.6%, 65–79 years old 9.4% and 80+ years old make up 3.0%. In Triengen about 60.4% of the population have completed either non-mandatory upper secondary education or additional higher education. there are 1,445 households, of which 350 households contain only a single individual. 229 or about 15.8% are large households, with at least five members. there were 808 inhabited buildings in the municipality, of which 582 were built only as housing, and 226 were mixed use buildings. There were 371 single family homes, 112 double family homes, and 99 multi-family homes in the municipality. Most homes were either two or three story structures. There were only 28 single story buildings and 38 four or more story buildings. Triengen has an unemployment rate of 2.27%. , there were 216 people employed in the primary economic sector and about 69 businesses involved in this sector. 1011 people are employed in the secondary sector and there are 44 businesses in this sector. 701 people are employed in the tertiary sector, with 81 businesses in this sector. 51.5% of the population of the municipality were employed in some capacity. At the same time, females made up 41.8% of the workforce. the religious membership of Triengen was; 3,035 were Roman Catholic, and 433 were Protestant, with an additional 67 that were of some other Christian faith. There are 2 individuals who are Jewish. There are 324 individuals who are Muslim. Of the rest; there were 12 individuals who belong to another religion, 141 who do not belong to any organized religion, 166 who did not answer the question.
