Most pine flooring is yellow pine.
It is found mostly in older construction. In homes built 60 to 100 years ago, it is usually found on the third and second floors over a sub-floor, as well as in attic areas. In homes built 100 to 250 years ago, you are more likely to find square edge pine board flooring. In many cases, there will be no sub-floor. Attic flooring is usually a flat grain, often found in the attic spaces of older homes.