What street is considered the dividing line between Manhattan’s East Side and West Side?

The dividing line between Manhattan's East Side and West Side is Fifth Avenue. This prominent avenue runs north to south and serves as a significant geographic and cultural landmark in the city. It is known not only for its role in separating the two sides but also for being home to some of New York City's most famous sites, such as Central Park, The Metropolitan Museum of Art, and the luxurious shopping districts.

The use of Fifth Avenue as the dividing line dates back to the 19th century, and it continues to be a point of reference for residents, tourists, and city planners. Understanding this division is essential for comprehending Manhattan's layout, as many neighborhoods and cultural attractions are situated on either side of Fifth Avenue.

Other options may represent important streets in Manhattan for various reasons, but they do not serve this specific geographic purpose. For instance, Park Avenue is known for its upscale buildings and business district, while Broadway is famous for its theaters and entertainment. Sixth Avenue is another key thoroughfare but does not define the East-West division in Manhattan.