Miss. Code Ann. § 19-1-113

Pike County is bounded by beginning at the northwest corner of township four, north, range seven, east; thence east on the township line to the northeast corner of section two, township four, north, range nine, east; thence due south along the east line of sections two, eleven, fourteen, twenty-three, twenty-six and thirty-five of townships four, three, two and one respectively to the thirty-first parallel of latitude, being the line between the States of Louisiana and Mississippi; thence west along the said thirty-first degree, being the boundary line between the states aforesaid, to the range line between ranges six and seven, east; thence north along said range line to the point of beginning. The county site is Magnolia.