250 addresses can be added to a map with the free version
1,500 addresses can be added to a map with the pro version
15,000 addresses can be added to a map with the premium version
Premium Big Data (no longer available)
100,000 addresses can be added to a map when latitude and longitude coordinates (See Supported formats) are provided.
For datasets larger than 10,000 locations, clustering should be enabled. Some browsers such as Chrome do render 10K pins on a map reasonably well. For larger datasets, out cluster engine does lazy loading, so clusters can show up to 100 times faster than the default clustering provided by code from Google.