507 Area Code: A Complete Guide to Southern Minnesota

Introduction

Stretch south from Minneapolis and St. Paul past the lake country and into the corn-and-soybean plains and you reach a different Minnesota — one of river-bluff cities, a world-famous medical campus, farm-country market towns, and a university city on the bend of the Minnesota River. This is 507 country, and the code has defined the region's telephone identity since 1954. In 2024 it made history by triggering Minnesota's first-ever overlay complex, adding a second code across the same geography for the first time in the state's history. This guide explains exactly where 507 reaches, how it was created, what the 924 overlay changed, and how any business can claim a genuine southern Minnesota presence.

What Is the 507 Area Code?

The 507 prefix is the telephone area code for southern Minnesota. It was established in 1954 as Minnesota's third area code, split from the original 218 and 612 codes that had covered the state since the late 1940s. The code spans a broad swath of the state's southern tier — from the historic river cities along the Mississippi in the east, across the prairie to the South Dakota border in the west, and from the Iowa state line north to the outer ring of the Twin Cities metro. Much like eastern Iowa's 319 area code, which sits directly to the south, 507 is a regional workhorse code binding a largely agricultural landscape together with anchor cities that carry outsized national significance.

Geographic Coverage and the Cities It Serves

The 507 code blankets the southern tier of Minnesota — roughly 40 counties running from the Mississippi River bluffs in the southeast to the South Dakota prairie in the southwest. The region is home to one of the Midwest's most recognizable medical institutions, a thriving network of college towns, and an agricultural economy that stretches unbroken to the Iowa state line. Major communities include:

• Rochester — the region's anchor city, home of the Mayo Clinic, and Minnesota's third-largest city (Olmsted County)
• Mankato — a university and manufacturing center on the bend of the Minnesota River (Blue Earth County)
• Winona — a historic river port on the Mississippi River bluffs (Winona County)
• Austin — home of Hormel Foods and the SPAM Museum, a manufacturing hub (Mower County)
• Albert Lea, Owatonna and Faribault — agricultural and light-industrial communities of the southeast
• Northfield — home of Carleton College and St. Olaf College, on the Cannon River
• Worthington and Fairmont — livestock and grain centers in the far southwest

The code covers a landscape of strong contrasts: world-class medicine in Rochester, Midwest college campuses in Northfield and Mankato, river industry in Winona, and the broad farm plains that make southern Minnesota one of the most productive agricultural corridors in the country.

Time Zone and How to Dial

The entire 507 region observes Central Time — UTC-6 in winter (CST) and UTC-5 during daylight saving (CDT), which runs from the second Sunday in March to the first Sunday in November. Since 924 was overlaid on the same territory in 2024, ten-digit dialing became mandatory for every 507 local call in July 2024:

• Local and regional calls: dial all ten digits — 507-555-1234.
• Long-distance from elsewhere in the U.S.: add a leading 1 — 1-507-555-1234.
• International callers: dial the exit code, then +1, then the full number — +1 (507) 555-1234.

Minnesota's First Overlay: Area Code 924

For seven decades 507 served southern Minnesota alone. By the early 2020s the combination of mobile lines, data SIMs and business numbers had pushed 507's supply toward a critical threshold. In August 2022 the North American Numbering Plan Administrator formally projected that 507 would be exhausted as early as 2025. Rather than re-split the region — which would have forced hundreds of thousands of customers to change their numbers — regulators chose an overlay: layering a brand-new code across the identical territory while every existing 507 number stayed in place. The same overlay model had already proved itself nationwide; in California, for example, the 657 code was layered onto Orange County's 714 area code in 2008, keeping every existing number intact.

The Minnesota Public Utilities Commission approved area code 924 as a full overlay on March 30, 2023. Ten-digit dialing became mandatory across all of southern Minnesota in July 2024, and new 924 numbers began being assigned on August 30, 2024. The change made 507/924 the first overlay complex in Minnesota's history — every existing 507 number remained untouched, and no customer had to change their number.

Benefits of a 507 Number for Business

A local area code is one of the most immediate credibility signals a business can carry. When a customer in Rochester or Mankato sees a familiar 507 on the caller ID, the call reads as a neighbor rather than an unknown national call center.

• Local credibility: customers in southern Minnesota are far more likely to answer a call from a recognizable regional code.
• Regional reach: a single 507 number signals a presence across the full southern tier, from Rochester to Worthington.
• Work from anywhere: cloud calling lets any business hold a local 507 line while operating from any location.
• Better first impressions: a local number lowers the friction of every inbound and outbound customer interaction.

How to Get a 507 Phone Number

Securing a 507 number is straightforward, whether for a single line or an entire team.

• Choose a provider: options range from traditional carriers to cloud platforms like Acepeak that provision numbers online.
• Pick or port a number: browse available 507 inventory or transfer an existing local line you already own.
• Verify details: provide basic business and billing information to complete the order.
• Activate: cloud providers routinely go live in minutes rather than the days a traditional carrier might take.

Scam Awareness and Staying Safe

Because a local code looks trustworthy, scammers sometimes spoof 507 numbers to appear as nearby callers. A 507 number on the caller ID still deserves the same scrutiny as any other unknown call.

• Never share sensitive information — bank account details, Social Security numbers or passwords — with an unexpected caller, regardless of the area code displayed.
• Verify urgent requests by hanging up and calling back on a published, official number from the organization's own website.
• Use call-blocking and spam-filtering tools available on most smartphones and through your carrier to screen unknown numbers.
• Report suspicious calls to your provider and the relevant consumer-protection authorities so others can be protected.

The Future of the 507 Prefix

With 924 now overlaid, the combined pool of southern Minnesota numbers is far larger than either code alone could have managed. For current 507 holders nothing changes — existing numbers stay valid indefinitely, and ten-digit dialing, mandatory since July 2024, is simply the new standard. If the 507/924 complex itself approaches exhaustion in future decades, regulators would most likely add a further overlay rather than force any geographic split, keeping every existing number intact. As the pool of southern Minnesota numbers expands, consumer safeguards matter more than ever — listing a line with the National Do Not Call Registry remains the simplest way for residents and businesses to cut down on unwanted calls. For current holders the practical takeaway is unchanged: a 507 number remains the clearest, most trusted local signal across southern Minnesota.

Conclusion

Southern Minnesota's telephone identity has been anchored by 507 since 1954 — and in 2024 the region made history by becoming the first in the state to operate under an overlay complex. The 924 addition extended the number supply without touching a single existing line, and ten-digit dialing is now simply how calls work across Rochester, Mankato, Winona and the farm counties in between. For any business that wants to sound genuinely local in one of the Midwest's most distinctive regions, a 507 number remains one of the most direct, cost-effective ways to build that presence.