Linn is a city in Washington County, Kansas, United States. The population was 425 at the 2000 census.
Linn is located at 39°40′49″N 97°5′8″W / 39.68028°N 97.08556°W / 39.68028; -97.08556 (39.680240, -97.085422). According to the United States Census Bureau, the city has a total area of 0.3 square miles (0.9 km²), all of it land.
As of the census of 2000, there were 415 people, 164 households, and 102 families residing in the city. The population density was 1,270.9 people per square mile (497.3/km²). There were 186 housing units at an average density of 556.2 per square mile (217.6/km²). The racial makeup of the city was 100.00% White. Hispanic or Latino of any race were 0.47% of the population.