As of the census of 2000, there were 345 people, 150 households, and 96 families residing in the town. Emma Grigsby Meharg (1873-1937), Texas Secretary of State and educator, was born in Lynnville. The population density was 1,060.2 people per square mile (403.7/km²). There were 161 housing units at an average density of 494.7 per square mile (188.4/km²).