Fair Lawn is located at 40°56′09″N 74°07′03″W / 40.935833°N 74.117504°W (40.935833,-74.117504). According to the United States Census Bureau, the borough had a total area of 5.201 square miles (13.472 km2), of which, 5.139 square miles (13.311 km2) of it is land and 0.062 square miles (0.161 km2) of it (1.20%) is water. Its borders are: with Paterson (in Passaic County across the Passaic River) to the South and West; with Hawthorne across Lincoln Avenue to the West; with Glen Rock across Harristown Road, Maple Avenue, the Northern border of the Nabisco plant and its extension north of Garwood Road and Naugle Drive to the North; with Ridgewood at one point in the Saddle River; with Paramus across the Saddle River to the East; with Rochelle Park at another point in the Saddle River; with Saddle Brook across the two longer portions of S. Broadway and their extensions through Rosario Court to the South; and with Elmwood Park across the Bergen County Line, New Jersey Route 4 (Broadway), Cyril Avenue, and Willow St. to the South and West.