Castalia Iowa Traffic 2025-02-26 Roadnow Click for Real Time Traffic Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to Castalia Iowa Ossian, IA 6.92 mi Postville, IA 9.32 mi Clermont, IA 13.19 miInterstate highway exits close to Castalia Iowa Exit 275, i90 87.13 mi Exit 257, i90 88.65 mi Exit 2, i90 88.93 miInterstate highways close to Castalia Iowa i90 map 87.13 mi i35 map 136.45 mi i94 map 137.20 miState roads close to Castalia Iowa US 52 IA map 1.24 mi US 18 IA map 7.27 mi IA 51 map 8.00 mi