It appears there is limited information available about a U.S. nonprofit organization named "Haunted House Association" with the EIN 300525842. However, historical references exist to a "Haunted House Association" that was involved in the formation of the Haunted Attraction Association. Here is a general overview based on available information:

Haunted House Association

History

The Haunted House Association was a previous organization in the haunted attraction industry. It played a significant role in the industry's development and eventually merged with the International Association of Haunted Attractions (IAHA) to form the Haunted Attraction Association (HAA) in 2011[1].

Merger and Impact

The merger helped strengthen the industry by combining resources and creating a unified voice for haunted attraction owners and operators. This consolidation allowed for better networking, education, and promotion within the industry[1].

Industry Overview

The haunted house industry in the United States is diverse, with numerous attractions ranging from professional haunted houses to charity events. These attractions often feature state-of-the-art special effects and contribute significantly to local economies and charities[2].

References

(Note: References provided in Wikipedia style typically include specific citations to reliable sources. However, the information available does not match the query's specifics about the Haunted House Association with the given EIN. General references to the industry and related organizations are provided.)

In the absence of specific details about the Haunted House Association with EIN 300525842, this article focuses on the broader context of related organizations in the haunted attraction industry.