High Quality Content by WIKIPEDIA articles! The City of Castle Pines North is an incorporated Statutory City located in Douglas County, Colorado, United States. The city is situated 19 miles (31 km) south-southeast of the Colorado State Capitol in Denver. Castle Pines North has an estimated population of about 9,500. The city is located north of the Castle Pines Golf Club and the unincorporated community of Castle Pines Village.