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 area_code_state (area_code VARCHAR, state VARCHAR)
TABLE: CREATE TABLE votes (state VARCHAR)

### Question ###
What is the area code in which the most voters voted?

### Accurate SQL ###

SELECT T1.area_code FROM area_code_state AS T1 JOIN votes AS T2 ON T1.state = T2.state GROUP BY T1.area_code ORDER BY COUNT(*) DESC LIMIT 1