where is national lampoon's christmas vacation filmed

The movie "National Lampoon's Christmas Vacation" was filmed in multiple locations in the United States. The primary filming location was the city of Pasadena, California, which served as the backdrop for the main characters' home and surrounding neighborhood. Other locations included nearby towns like South Pasadena and Altadena, as well as scenes filmed in Chicago, Illinois, and Sun Valley, Idaho. The Christmas tree farm scenes were filmed at the Farmstead Christmas Tree Farm in South Pasadena, California.