Unfortunately yes there is a limit to the number of lists that you can have in an account. You can only have up to 4,000 lists within your Benchmark Email account, but you can have as many contacts as your plan allows. If you have sub-accounts, each sub-account and master account can each individually support 4,000 lists. Remember it is not the quantity of contacts and lists, but quality as well!
There is no recommended way to organize your lists, but we do recommend to clean your list regularly or at least once a year. You can also reduce the number of lists by utilizing Benchmark Email’s list segmenting feature. This allows you to split 1 list into many different demographics. This is another method of organizing your contacts.