Internet Archive has several digitized books related to Kent County History and cities in Kent County, Rhode Island.
County Histories generally give information on the settlement of an area, geography, government, and industry in an area, and sometimes include biographical sketches of citizens or other information about the local residents. Some even include genealogies.
Kent County Histories and histories of cities and peoples in Washington County, Rhode Island include:
Documentary History of Rhode Island, Volume 1, 1916 (Being the History of the Towns of Providence and Warwick to 1649 and of the Colony to 1647)
The History of Warwick, Rhode Island, published 1875
Town Records of Warwick, Rhode Island, published 1912