How do we know what Precinct we are in there are no maps here or on the town site that I can find.

Here is a link that shows by street the precinct that you are in. Hope this helps.
http://www.grafton-ma.gov/Public_Documents/GraftonMA_Clerk/NEW%20PRECINCT%20LIST.pdf

what about North Grafton?

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http://mavotenoonquestion3.com/question-3-in-3-minutes/

Question 3 is a "Wolf in Sheep's Clothing" warn citizens in California and Colorado where pot stores have proliferated under a law similar to the one proposed here. The language in this 6-page law includes "other conditions" which allows virtually anyone to get a marijuana recommendation for any reason. There can be 35 pot stores in the first year, but there is no upper limit in the law. This is the LEAST RESTRICTIVE marijuana law in New England. With an undefined 60-day supply, amounting to hundreds of joints, allowed on a person or in a car, theft and diversion to black market sales are inevitable. Home grow sites are already subject to criminal break-ins in neighborhoods as close as Rhode Island. And even the Obama administration has called rising levels of youth use and addiction a legitimate public health issue. There has to be a better way to be compassionate.
Please get the details before you vote. To learn about Question 3 go to: www.MaVoteNoOnQuestion3.com