There will be 10 districts; residents thus far in 1-8; There is a lot of information on the CDD website. Here's a good starting point:
http://www.districtgov.org/slcdd/yourdistrict/index.asp
(sometimes you can't link directly from within TOTV; if so, just copy the above link into your web browser address bar)
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Maryland (DC Suburbs) - first 51 years

The Villages - next 51 years