Nichols Hills is a city in Oklahoma County, Oklahoma, United States, and a part of the Oklahoma City metropolitan area. The population was 3,870 as of the 2020 census, a 4.3% increase from 2010.

Oklahoma County is located in the central part of the U.S. state of Oklahoma. As of the 2020 census, the population was 796,292, making it the most populous county in Oklahoma. The county seat is Oklahoma City, the state capital and largest city. Oklahoma County is at the heart of the Oklahoma City metropolitan statistical area.