Washington Post: “Tom Thumb in Plano, Texas. Star Market in Dorchester, Massachusetts. Pavilions in Newport Beach, California. Jewel-Osco in Glenview, Illinois. What do these regional grocery chains have in common? They’re all owned by Albertsons, the Boise, Idaho-based company with more than 2,200 locations under about two dozen banners. Over the past three decades, the traditional supermarket industry shrunk as a handful of big-name grocers acquired their smaller local and regional rivals. Now Walmart, Kroger, Aldi (Süd) and Albertsons own a third of all U.S. grocery stores locations, according to a Washington Post analysis of OpenStreetMap location data. But the marquee companies could further concentrate their dominance: A federal judge in Portland, Ore., is deciding whether Kroger and Albertsons can proceed with a merger in what would be the biggest supermarket union in U.S. history. Here are the supermarket chains with the most locations across the country…”