[3] Linn Valley had its start in the 1970s as a planned community centered around a lake.

[6] All but about 200 acres (0.81 km2) of the City is within the private closed community of Linn Valley Lakes.

The 2020 United States census counted 956 people, 457 households, and 299 families in Linn Valley.

There were 637 housing units at an average density of 215.3 per square mile (83.1/km2).

28.4% of households consisted of individuals and 14.2% had someone living alone who was 65 years of age or older.

There were 697 housing units at an average density of 256.3 per square mile (99.0/km2).

27.5% of all households were made up of individuals, and 10% had someone living alone who was 65 years of age or older.

There were 415 housing units at an average density of 163.7 per square mile (63.2/km2).

19.3% of all households were made up of individuals, and 9.2% had someone living alone who was 65 years of age or older.

The community is served by Prairie View USD 362 public school district.