Downtown Dallas is the main business istrict in Dallas, Texas USA, located in the geographic center of the city. The area officially termed "downtown" is bounded by the downtown freeway loop: bounded on the east by I-345 (although known and signed as the northern terminus of I-45 and the southern terminus of US 75 (Central Expressway)), on the west by I-35E, on the south by I-30, and on the north by Spur 366 (Woodall Rodgers Freeway).