Hardenville, MO

ZIP code 65666 is located in the small town of Mammoth Spring, Arkansas. This area is known for its stunning natural beauty, with the namesake Mammoth Spring being the standout landmark. The spring is one of the largest in the United States and serves as a popular spot for fishing, picnicking, and wildlife viewing. Additionally, Mammoth Springs State Park, offering hiking trails and historic sites, is a notable attraction in this zip code.