Laurel is a city in Yellowstone County, Montana, United States. It is part of the Billings, Montana Metropolitan Statistical Area. The population was 6,255 at the 2000 census. Both Interstate 90 and a number of local railroads run through Laurel. It is most known for its industry and agriculture, but also has a historic shopping district. Laurel is home to a Cenex oil refinery & Montana Rail Link's Laurel Yard, the largest rail yard between St. Paul, Minnesota & Pasco, Washington.