A concise list of non-profit organizations, by county, can be found at http://www.taxexemptworld.com/organizations/wisconsin-counties.asp

There is no reliable data on the number of UFO sightings reported specifically in AD 960 as modern methods of tracking and documenting UFO sightings did not exist at that time. UFO reports began to be documented in the mid-20th century with the establishment of organizations like the Mutual UFO Network (MUFON) and the National UFO Reporting Center (NUFORC).

To find a list of non profit organizations, check online at the site Non Profit List or List of Non Profit Organizations. Try your local phone book to find a non profit near you.

Yes it is correct, but in text is should be written 'a thousand organizations'. Either is correct however:

We have a 1000 organizations on our mailing list.

We have a thousand organizations on our mailing list.

See: List of anti-war organizations.