Louisiana's 19th State Senate district is one of 39 districts in the Louisiana State Senate.

[3] District 19 covers parts of Jefferson, Lafourche, St. Charles, and St. John the Baptist Parishes along Lake Pontchartrain in Greater New Orleans, including some or all of LaPlace, Norco, Hahnville, Boutte, Des Allemands, Destrehan, Luling, St. Rose, Kenner, and Raceland.

The district also includes a sizable portion of Lake Pontchartrain itself, hence its unusual shape.

[4] Louisiana uses a jungle primary system.

If no candidate receives 50% in the first round of voting, when all candidates appear on the same ballot regardless of party, the top-two finishers advance to a runoff election.