1. Falkstone 1574 440th St, Northwood, IA 50459 Coordinate: 43.40432,-93.26598 Phone: (641) 324-1320
2. Martin Marietta Aggregates 1424 Highway 105, Northwood, IA 50459 Coordinate: 43.44556,-93.23834 Phone: (641) 324-2399