The Oregon Department of Education has been providing report cards for every public school in the state, based on their primary data, for several years. Any other source is probably using census data or other sources to imply information such as eligibility for free or reduced lunch. Yes, you can call the school to get information. They may also refer you to the state education Website for first-hand information about many aspects of the school. Here's the site: http://www.ode.state.or.us/data/reportcard/
Just choose the school district from the pull-down menu (Llewellyn is in the Portland SD), then scroll down alphabetically to the school you're looking for.
Oregon Principal Broker
The information for Llewellyn Elementary can be found at: http://publicschoolsk12.com/elementary-schools/or/multnomah-
According to the site, 20% of the students are eligible for free lunch with 6% eligible for reduced lunch. I hope this helps!