Avoca is an unincorporated community and census-designated place in Marshall Township, Lawrence County, Indiana, United States. As of the 2010 census the population was 583. Avoca was platted in 1819. The community likely took its name after the River Avoca, which was mentioned in a poem by Thomas Moore. The Avoca post office was …Avoca is an unincorporated community and census-designated place in Marshall Township, Lawrence County, Indiana, United States. As of the 2010 census the population was 583. Avoca was platted in 1819. The community likely took its name after the River Avoca, which was mentioned in a poem by Thomas Moore. The Avoca post office was established in 1856.
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