The area code 641 is located in Mason City, Iowa.
Area code 641 serves Mason City, Iowa, and a wide slice of north-central and central Iowa. Centered around the Clear Lake–Mason City area along I‑35 and US‑18, this code links small cities, farm communities, and regional hubs across the state. If you see a 641 phone number, it’s tied to this part of Iowa and follows Central Time (CT). The region blends rich Midwestern history, thriving small businesses, and easy access to lakes, trails, and classic downtowns.
Major cities and landmarks covered by area code 641 include:
Area code 641 was introduced when Iowa’s 515 territory was split to add number capacity. It began service in 2000 and today remains the primary code for this broad central and north-central area. “Area code 641 was created July 9, 2000, in a split from 515.” — North American Numbering Plan Administration (NANPA)
Mason City gives 641 a notable cultural anchor: it’s the real-life “River City” that inspired Meredith Willson’s The Music Man. The city also hosts the world’s last remaining Frank Lloyd Wright–designed hotel, the Historic Park Inn. Nearby Clear Lake’s Surf Ballroom hosted Buddy Holly’s final concert in 1959, adding national music heritage to the 641 map. From college towns to county seats, area code 641 connects everyday life across Iowa with reliable local and mobile phone numbers.