1. Martin Marietta Aggregates
2090 Penn Ave, Humboldt, IA 50548
Coordinate: 42.74381,-94.14832
Phone: (515) 332-7030
2. Martin Marietta Aggregates
2314 210th St, Humboldt, IA 50548
Coordinate: 42.74596,-94.18178
Phone: (515) 332-1256
3. Martin Marietta Aggregates
2336 210th St, Humboldt, IA 50548
Coordinate: 42.74607,-94.16883
Phone: (515) 332-1256