Texas Farm-to-Market 1840 east-west in Central Bowie County. This highway runs from De Kalb to Boston. TX FM Rt 1840 passes through the following towns in Bowie County. De Kalb Old Salem Boston TX FM Rt 1840 is not multi-plexed in Bowie County. TX FM Rt 1840 intersects the following highways in Bowie County. U.S. Rt. 82, at De Kalb. Texas Farm-to-Market 990, near De Kalb. Interstate 30, near Old Salem. Texas State Route 98, near Boston. Texas State Route 8, at Boston.
