How to relate LatLong and State columns on PowerBI I have two separate tables, one with latitude and longitude columns (for locations in the USA), and the other with the US state abbreviation (TX, AZ, CA, etc).

Is there a way to count the number of rows in the LatLong table that fall within each state in the other table using PowerBI?
Without ever using PowerBI, without even knowing what it is, no. Highly unlikely.

You'll have to pull in Shapefiles that represent the states from the Census or like data-source. Then you'll have to construct points representing the cords and run point-in-polygon on the result.

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