Troy is a 34 sq. mi. mid-ring suburb of Detroit. It is mostly made up of newer subdivisions and office parks. It is the "office center" of Oakland County, but it isn't the "main" city. Pontiac is the original "major" city of Oakland County, while the Royal Oak area represents the population "center". Pontiac has a little under 70,000 people in about 20 sq. mi., but the Royal Oak area (which actually includes 10 different cities) has a population of over 200,000 in about 38 sq. mi. Troy currently is the largest it has ever been, Pontiac peaked in 1970 with over 85,000 people, and the Royal Oak area peaked in the late 60's with nearly 280,000 people, again in just 38 sq. mi.