Toyota Motor and Mazda Motor are expected to announce on Wednesday that they have chosen a location in northern Alabama, near Huntsville, for the $1.6 billion car plant the Japanese automakers are planning to build together, according to a person familiar with the companies’ plans.
Details of the assembly plant, which is expected to employ about 4,000 people and open by 2021, will be disclosed at a news conference with state and local officials in Montgomery, this person said.
Toyota already operates four auto assembly plants in the United States, in Kentucky, Indiana, Mississippi and Texas.
Toyota and Mazda are moving forward with the plant at a time when new-vehicle sales in the United States have started to decline.
A version of this article appears in print on January 10, 2018, on Page B5 of the New York edition with the headline: Car Factory Is Expected In Alabama.