In the 1899 Iowa State Senate elections Iowa voters elected state senators in 31 of the state senate's 50 districts. State senators serve four-year terms in the Iowa State Senate. A statewide map of the 50 state Senate districts in the 1899 elections is provided by the Iowa General Assembly here. The 1899 elections occurred before primary elections were established in Iowa by the Primary Election Law in 1907. The general election took place on November 7, 1899. Following the previous election, Republicans had control of the Iowa Senate with 39 seats to Democrats' 11 seats.