[3] Little River County is included in the Texarkana, TX-AR Metropolitan Statistical Area.

[4] The line was extended from Arkinda into Oklahoma, and from Ashdown to Hope, Arkansas, in the 1902-1903 timeframe.

As of the 2020 United States census, there were 12,026 people, 5,363 households, and 3,523 families residing in the county.

26.30% of all households were made up of individuals, and 12.00% had someone living alone who was 65 years of age or older.

Each township includes unincorporated areas; some may have incorporated cities or towns within part of their boundaries.

However, the United States census does list Arkansas population based on townships (sometimes referred to as "county subdivisions" or "minor civil divisions").

Each town or city is within one or more townships in an Arkansas county based on census maps and publications.