Ridgefield is a borough in Bergen County, New Jersey, United States. As of the 2010 United States Census, the borough population was 11,032. Ridgefield is unofficially divided into three sections because of the geographical contour of the land. The first section is known as Ridgefield, and lies partly in the valley on both the east and west sides and partly on the first hill. The second section is known as Morsemere, and is located in the northern part of the borough. The third section is Ridgefield Heights, on the second hill at the extreme eastern part of the borough, running north and south.