Here are two websites that provide census and other information for the Rock Creek neighborhood:
(Copy the URL and paste it on your browser).
The Rock Creek Community Association website is: http://www.myrockcreek.com
The CPO-7 (Citizens’ Participation Organization No. 7), which includes Rock Creek, Bethany, & Sunset West, website is: http://extension.oregonstate.edu/washington/cpo-7-sunset-westrock-creekbethany.