Angarsk is located in the southwestern, most developed and mastered part of the Irkutsk region, in the interfluve of the rivers Angara and Kitoy. The distance to the regional center – the city of Irkutsk is 40 km.

The neighbors in the south-west, north-west and north are Usolsky district, in the east and southeast Irkutsk and Shelekhov districts. Angarsk is located 50 km from the international airport of Irkutsk.

The distance to Baikal Lake – the oldest and deepest lake on Earth is 120 km.