The Smiths Grove exterior is made up of two locations. The first is the MacDougall Correctional Institution at 1516 Old Gilliard Road in Ridgeville, South Carolina.
The shots of Laurie Strode were done in a parking lot at 7555 Palmetto Commerce Parkway in North Charleston. This is just down road from the Strode house used in the film.
Here is a behind the scenes shot of the scene. This was the last day of principal photography for Jamie Lee Curtis.
Some behind the scene crew pics where they are wearing the “I am Laurie Strode” name badges.
And here is the spot where they took the crew picture.