Trzin is the third smallest and economically most successful Slovenian municipality. Until 1998, Trzin was part of the municipality of Domžale, but today it is an independent municipality with one settlement and almost 4,000 inhabitants at an altitude of 299 m. Trzin is connected to Ljubljana, Domžale, and Kamnik by a railway line with three stations within the settlement area and by bus lines.
The Pšata River flows through the town, originating from Krvavec and later flowing into the Kamniška Bistrica River.
The first mentions of Trzin date back to 1273 when the German Knights Order in Ljubljana acquired 6 'hub' in Trzin (Direzin). According to Rudolf Badjur's explanation in the book "Ljudska geografija", the term 'trzni' refers to less valuable meadows, which in this case corresponds to the marshy surroundings. This explains the origin of the name Trzin.
In Trzin, in 1851, Ivan Hribar was born - a politician, banker, publicist, and diplomat, mainly known for his patriotism. The Ivan Hribar Trzin Center, home to several institutions and associations, is named after him.
The most important cultural and artistic monument in Trzin is the parish church of St. Florian, built in the mid-14th century. It was first mentioned in a list of church treasures in 1526. Valvasor mentioned it only as a branch of the Mengeš parish. In 1902, it received its first permanent priest, but only until 1938. Since January 1, 1974, it has been an independent parish. The church features works by some of the most important Slovenian artists. Among the church's artworks, one can find pieces from the famous Ljubljana sculpture workshop, works by Franc Jelovšek, Leopold Layer, Matija Koželj, both Matija Bradaška (younger and elder), and also Jože Plečnik.
In the old part of the settlement, there are several architecturally interesting houses, and the memory of old times is also evoked by hayracks, granaries, and other cultural heritage monuments of the place.
The Trzin municipality stretches to the west with the Onger hill to the hilly forest area, continuing with the hills of Rašica, Dobeno, and Gobavica beyond the municipal borders. Here, a solitary karst has developed, with characteristic depressions, protruding rocks on the surface, and karst springs at the foot. The hilly and wooded part of the municipality provides a backdrop for most of the sources and the headwaters of a fairly branched network of streams that wind through alder groves all the way to the urbanized part of the municipality. The Blatnica and Motnica streams, with tributaries originating in the Trzin forests under Dobeno and Rašica, have deposited extensive alluvial fans between Trzin and Dobrava. Here, remnants of once more extensive wetlands are preserved, which are the habitat of many endangered and protected plant and animal species. Wetlands are threatened by both natural overgrowth and overgrowth with alien plant species. To the east, the surface transitions to the edge of the Kamnik-Mengeš field with the "tamed rapid" Pšata. In the lower Pšata area in the far southeast of the municipality, fragments of marshy meadows and groves have been preserved. The marsh tulip or marsh checker (Fritiiiaria meleagris), a plant representative that is in the coat of arms of the Trzin municipality, still thrives here. The Trzin municipality area includes five natural values, the ecologically important area of Rašica, Dobeno, Gobavica, and the special protection area (Nature 2000 area) of Rašica.
Most of the Trzin Municipality is covered by forest, in which one can find pleasant walking paths, most of which are well maintained. Among the more famous trails are the trim track, popular among recreational runners, the Onger Forest Learning Trail, the surroundings of Fernihot's Bajer, and the White Road.