If you're involved with Christmas or Breeding Bird Counts, the boundaries of your count circle are always of interest, and sometimes unclear. Count Circle includes the complete National Audubon database of CBCs (updated as of December 2018), with a total of 2883 different count circles in 93 different states, provinces and territories including Canada, Mexico, the Caribbean, South America, and Antarctica. Lookup and display any count circle on an interactive map, and find out exactly what is (and is not) included in the circle. You can even display multiple circles at the same time, including, with just one click, all of the circles in a particular state or country.
Count Circle also displays your current location, so you can determine precisely if you are inside or outside the count circle as you are doing your count.
You can also use Count Circle just to view the different circles, to help you decide which ones you might like to participate in.
If you have reason to believe the database is in error, or if you are a count organizer and want to experiment with repositioning the circle for better coverage of key areas, Count Circle lets you set the center of the circle, then update the database, and even, if you choose to do so, report the revision directly to National Audubon.
You can also create and save your own circles, and, combined with the ability to display multiple existing circles, this provides the perfect way to position a potential new circle so that it doesn't overlap existing circles. You can even choose the radius (in miles or kilometers) if you want to use something other than the "standard" 7.5 mile radius used for the CBC. A great addition for "patch challenges"!
Note: Count Circle is not affiliated with nor endorsed by the National Audubon Society. Christmas Bird Count is a trademark of the National Audubon Society.