Rochester is a city in Monroe County, New York

Monroe County, New York

Monroe County is a county located in the U.S. state of New York. As of the 2010 census, the population was 744,344. It is named after James Monroe, fifth President of the United States of America. Its county seat is the city of Rochester....

, south of Lake Ontario

Lake Ontario

Lake Ontario is one of the five Great Lakes of North America. It is bounded on the north and southwest by the Canadian province of Ontario, and on the south by the American state of New York. Ontario, Canada's most populous province, was named for the lake. In the Wyandot language, ontarío means...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. Known as The World's Image Centre, it was also once known as The Flour City, and more recently as The Flower City. It is the county seat for Monroe County.

Rochester's city population according to the 2010 census is approximately 210,565, making it New York's third most populous city after New York City

New York City

New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

 and Buffalo

Buffalo, New York

Buffalo is the second most populous city in the state of New York, after New York City. Located in Western New York on the eastern shores of Lake Erie and at the head of the Niagara River across from Fort Erie, Ontario, Buffalo is the seat of Erie County and the principal city of the...

. It is at the center of a larger Metropolitan Area

Rochester, New York metropolitan area

The Rochester, New York Metropolitan Statistical Area , as defined by the United States Census Bureau, is an area consisting of five counties in Western New York, anchored by the city of Rochester...

 which encompasses and extends beyond Monroe County

Monroe County, New York

Monroe County is a county located in the U.S. state of New York. As of the 2010 census, the population was 744,344. It is named after James Monroe, fifth President of the United States of America. Its county seat is the city of Rochester....

 and includes Genesee County

Genesee County, New York

Genesee County is a county located in Western New York, United States. As of the 2010 census, the population was 60,079. Its name is from the Seneca Indian word Gen-nis'-hee-yo meaning "The Beautiful Valley." Its county seat is Batavia.- History :...

, Livingston County

Livingston County, New York

As of the census of 2000, there were 64,328 people, 22,150 households, and 15,349 families residing in the county. The population density was 102 people per square mile . There were 24,023 housing units at an average density of 38 per square mile...

, Ontario County

Ontario County, New York

As of the census of 2000, there were 100,224 people, 38,370 households, and 26,360 families residing in the county. The population density was 156 people per square mile . There were 42,647 housing units at an average density of 66 per square mile...

, Orleans County

Orleans County, New York

As of the census of 2000, there were 44,171 people, 15,363 households, and 10,846 families residing in the county. The population density was 113 people per square mile . There were 17,347 housing units at an average density of 44 per square mile...

 and Wayne County

Wayne County, New York

Wayne County is a county located in the US state of New York. It is part of the Rochester, New York Metropolitan Statistical Area and lies on the south shore of Lake Ontario, forming part of the northern border of the United States with Canada. The name honors General Anthony Wayne, an American...

.