Dallas Historical Society Home Page The Dallas Historical Society is a non-profit organization formed to institute and encourage historical inquiry; to collect, preserve, and exhibit the material of history; and to spread historical information, especially concerning the city and county of Dallas and North Texas. The Dallas Historical Society is a non-profit organization formed to institute and encourage historical inquiry; to collect, preserve, and exhibit the material of history; and to spread historical information, especially concerning the city and county of Dallas and North Texas. dallasfairhallhistoricalhistoryparksocietiessocietystatetexas in Genealogywith dallasformedgenealogyhistoricalinstitutenon-profitorganizationsociety