Cities don't have single "GPS addresses"—coordinates pinpoint specific locations. For Niagara Falls, New York, the approximate central coordinates are:
Enter these into any GPS device, Google Maps, Apple Maps, or Waze for precise navigation. Remember that the falls straddle the U.S.-Canada border—Niagara Falls, Ontario has separate coordinates (approximately 43.0581° N, 79.0790° W for the Horseshoe Falls area).