Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_71 (population INTEGER, area_km_2 VARCHAR, official_name VARCHAR)

### Question ###
What is the average population vlue for an area smaller than 26.69 square km and has an official name of Rogersville?

### Accurate SQL ###

SELECT AVG(population) FROM table_name_71 WHERE area_km_2 < 26.69 AND official_name = "rogersville"