Where was Nightbreed filmed?

Filming locations

• Towns & cities Los Angeles United States Seat of Los Angeles County, and largest city in California, United States

  “Barker shot extra scenes over three days in Los Angeles in late 1989 which included additional scenes with David Cronenberg which expanded and clarified his character.” Wikipedia

• Studios & sets Pinewood Studios England British film studio and television studio situated in Iver Heath, Buckinghamshire, England

  “For the film, Barker used three soundstages at Pinewood Studios shooting some scenes on location at Wexham Park Hospital, Slough, Berkshire, UK over several nights and in Calgary, Alberta, Canada.” Wikipedia

Also per Wikipedia's Filming section

Wikipedia’s Filming section names 1 more place. Each links to the sentence that says so.

Recorded only at country level

Also filmed in British Columbia, but the exact places are not known, so they are not on the map.

Also shot in these places

Set in the same places