Conant built the first Salem house on what is now Essex Street, opposite the Town Market. In 1630 he was chosen as a freeman, or voting stockholder of the Massachusetts Bay Company. Conant was one of the first two Salem representatives to the colony's general court or legislature, and was repeatedly elected a selectman by the people of Salem. When the legislature granted communities the right to establish district courts, Roger Conant served on numerous Salem quarterly juries for sixteen years. He also was involved in civic activities over the years such as establishing town boundaries and laying out land grants.