Be prepared to be amazed at this wonderful site. Within minutes I had downloaded a list of all Dragonflies and Damselflies recorded from my county. State lists are here too.
For any species, you can view a map of your state, with counties shown and a dot in the counties where the species occurs. You can even view a map of the whole USA and Canada with a dot shown for each record.
Last year as this project was in its final phases, I contributed all my county records. Now everyone can contribute their records on-line. Photographic records will be vetted by experts and if the experts agree the ID is right they will accept the record. The site is affiliated with DSA, the chief dragonfly society in North America.
The only caveat: This is not a fun site to use on dial-up. Try to use a faster connection if you possibly can. Even via broadband, the maps may take a full minute or more to download. It is worth the wait.
Disclaimer: Dedicated naturalists volunteer their time and resources here to provide this service. We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. If you need expert professional advice, contact your local extension office.