The 903 area code includes Texas cities Athens, Carthage, Centerville, Corsicana, Denison, Greenville, Henderson, Jacksonville, Kilgore, Longview, Marshall, Mt. Pleasant, Palestine, Paris, Rusk, Sherman, Texarkana, Tyler.
Nearby area codes are 214, 254, 318, 430, 469, 580, 870, 936, 972 and 979.