There are more than 4.3 million registered voters in the Boston radio metro. Here is the number by county:

• Essex, MA: 533,867
• Middlesex, MA: 1,045,30
• Norfolk, MA: 485,131
• Plymouth, MA: 367,838
• Suffolk, MA: 472,972
• Worcester, MA: 541,824
• Hillsborough, NH: 892,318

According to Nielsen, Boston radio reaches significantly more of these registered voters than all other media, including local television pay-TV, newspaper, social media platforms, and streaming audio sites like Pandora or Spotify.