The highway passes through the small towns of Agra and Kensington before reaching Smith Center where US - 281 joins US - 36 for a 12 - mile ( 19 km ) concurrency .
Smith Center is the seat of Smith County .
The highway passes through the small towns of Agra and Kensington before reaching Smith Center , the seat of Smith County , where US - 281 joins US - 36 for a 12 - mile ( 19 km ) concurrency .