Blandford Forum is a market town in Dorset, England, on the River Stour, 13 miles north-west of Poole. It had a population of 10,355 at the 202…Blandford Forum is a market town in Dorset, England, on the River Stour, 13 miles north-west of Poole. It had a population of 10,355 at the 2021 census. The town is notable for its Georgian architecture, the result of rebuilding after a major fire in 1731; it was assisted by an Act of Parliament and a donation by George II, to designs by local architects John and William Bastard.