State Route 21 (SR 21) is a north-south highway located in the state of New York. It runs approximately 90 miles, connecting the Pennsylvania border near Wayland to the New York state line at Canandaigua Lake. The route primarily serves rural areas and small towns, providing access to local attractions and communities. SR 21 passes through several counties, including Steuben, Ontario, and Yates. It intersects with other major roads, enhancing connectivity within the region. The highway is important for local traffic and supports economic activities by linking residents to essential services and businesses.