Gjerstad is a settlement in Gjerstad Municipality, in Agder, Norway. Gjerstad lies at 83 m above sea level, 9.1 km from the Scandinavian mountains. It has 301 inhabitants (2025). The nearest city is Porsgrunn/Skien, 46 km to the east. Among the landmarks around are Søndeled Church (13.6 km), Gjerstad Church (0.2 km) and Kroken Church (9.6 km). Among the natural features are Drivheia (9.0 km).
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