How many estates are there in US?

In the United States, there are generally three types of estates recognized in estate law: the probate estate, which encompasses assets that go through probate; the non-probate estate, which includes assets that transfer outside of probate; and the taxable estate, which is relevant for estate tax purposes. However, if you're referring to the broader concept of estates in terms of land or property, there are countless estates across the country, varying widely in size and purpose.