High Quality Content by WIKIPEDIA articles! Walnut Hill is a historic neighborhood located in north Omaha, Nebraska. IT is bounded by North 40th Street on the east, Cuming Street on the south, Northwest Radial Highway and Saddle Creek Road on the west and Hamilton Street on the north.DR. SAmuel Mercer constructed a large, private residence at 40th and Cuming Streets and platted the Walnut Hill subdivision northwest of his home in the 1880s. PReviously, Mercer financed the construction of cable-line streetcars in Omaha, and by the end of the 1880s, his line extended as far west as North 36th and Cuming Streets.