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A census analysis of household size, children, age, and housing type is the way it can be done.
One County I am familiar with has conducted its own school census, taking the the number of children ages 1 to 19 in a certain area/subdivision. The info is then reconciled with the number and type of corresponding residential units in the same area. it can be further broken down into number of elementary students etc...
Here are the juristictions numbers
single family detached= .75 school aged-children
single family attached= .44
I think the national multi family housing institue uses .25 for their pupil generation.
Home builder organizations may have some data they could share.
Not sure if you have heard up there in TO, but down here we are having problems with some of our school boards. In our case, apparently the school board does not do projections, estimations, whatever interest ing huh and they wonder where all of the money goes!!!