The OOB numbers are available -- you can get them by subtracting in my msg above. Again, 1,105 Ward 5 middle schoolers in DCPS total, 654 Ward 5 middle schoolers in ward 5 schools.
Best bet for charter school numbers is probably the PCSB (I do not know whether they have it, just guessing). Doubt you'll get private numbers anywhere.
Here is DCPS's page about that meeting but it doesn't look like they put up the data from the handout unfortunately:
http://www.dc.gov/DCPS/Parents+and+Community/Community+Initiatives/Ward+5+Great+Schools+Initiative