The parish of Aas was established as a municipality January 1, 1838 (see formannskapsdistrikt). The parish was named after the old farm Ås (Norse Áss), since the first church was built there. The name is identical with the word áss m 'mountain ridge'. The spelling Aas was in use til 1921.
A 240 metre span bridge, which is a smaller scale recreation of a bridge that Leonardo da Vinci proposed in 1502 for the crossing of the Golden Horn is located in the municipality. It was created by Norwegian painter and artist Vebjørn Sand as part of his Da Vinci project. The bridge serves as a pedestrian crossing over European route E18.
Ås is best known for the Norwegian University of Life Sciences and the amusement park Tusenfryd. Two of Norway's largest highways, European route E6 and European route E18, run through the municipality, and many of the inhabitants commute to Oslo. The most important source of income is agriculture; Ås is the largest agricultural municipality of Akershus, providing the region with corn, vegetables, and dairy products, 80% of the land being cultivated.