Yeah, it's a way overpopulated area, Tempe's population is just under 200,000, around 4,000 people per square mile.
The whole Phoenix metro area is about 4.2 million people.
If it wasn't for the signs, you couldn't tell one city from another.
This area epitomizes 'urban sprawl', the metro area is about 70 miles north/south, and about 75 miles east/west.