High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Kirtland is a city in Lake County, Ohio, USA. The population was 6,670 at the 2000 census. Kirtland is famous for being the early headquarters of the Latter Day Saint movement. According to the United States Census Bureau, the city has a total area of 16.7 square miles (43.3 km²), of which, 16.6 square miles (43.0 km²) of it is land and 0.1 square miles (0.3 km²) of it (0.66%) is water.