Great question!
For most local businesses you’re going to end up with…
Google
Facebook
Yelp
BBB
Then you’ll probably end up with some niche-specific sites like…
Contractors/Home Services:
Angi
Home Advisory
Houzz
Legal:
Avvo
Findlaw
Lawyers.com
Martindale
Auto
Edmunds
Dealer Rater
Cars.com
eBay.com
Another great way to uncover which sites you should care about monitoring is to Google “your brand”, and “your brand reviews” to see what review sites are ranking and add those to our monitoring.