What is the total area of 640 acres in square miles?

To determine the total area of 640 acres in square miles, it's essential to know the relationship between acres and square miles. One square mile is defined as 640 acres. Therefore, when you have 640 acres, it directly converts to 1 square mile.

Understanding the conversion is crucial in real estate and property management, especially in Washington State, where land parcels might be referred to in either acres or square miles. This conversion helps in assessing land use, zoning, and property valuation accurately.

Given this context, the correct answer reflects the fundamental conversion between these two units of area measurement.