Drive-in movie theaters used to only be a drive away. But the number of outdoor screens started to drop as property values increased, moviegoers went with other options, and multi-screen movie theaters became more popular. Pennsylvania still has 20 drive-in theaters, or around 1.5 drive-ins for every 1 million residents. Downstate residents can find a good movie at the Warwick Drive-In while upstate residents can try the Finger Lakes Drive-In. IndianaA neon "Entrance" sign glows in front of the Georgetown Drive-In movie theater in Georgetown, Indiana, | Bloomberg/GettyImagesDrive-ins: 10There's a noticeable drop from Texas to Indiana, which still operates 10 drive-in theaters.