In Harrison County, a county having two judicial districts, the board of supervisors shall hold their meetings or sessions at the time required and provided for by law, alternately at Gulfport and Biloxi, respectively, at the seats of justice of the judicial districts, holding their first meeting or session as to the second judicial district, at Gulfport and their jurisdiction shall extend over the entire county at all times, just as if it were not divided into two separate districts.