RochesterThrills.com . . . Rochester, NY is the 79th largest city in the United States, and the 3rd largest city in New York State. A little more than one million people inhabit the greater Rochester region...Rochester became America's first "Boom Town"... Rochester first commercially produced marshmellows, and in 1904 the first prepared mustard was manufactured by the R.T. French Company... The city influenced a young George Eastman to invent the flexible-film camera, making photography available to everybody.