Arapahoe County is only 12 miles wide, and around 7 miles south of Denver, so it has been built up for sometime. The housing is 50 years old, and small by modern standards.
Interesting. From the Census numbers, it looks as if the population has increased about 3.5x since 1970.
1960 113,426 117.6%
1970 162,142 42.9%
1980 293,621 81.1%
1990 391,511 33.3%
2000 487,967 24.6%
2010 572,003 17.2%
Arapahoe County has plenty of room to grow eastward. The most recent growth was likely near the E-470 corridor south of Denver International Airport.
