There is one unique ZIP code in Fairmont, Minnesota and it is 56031. Area code: 507.
1
ZIP codes
156.32
sq mi land
7.67
sq mi water
507
area code
Fairmont, MN ZIP code map
About Fairmont, MN
Fairmont is a welcoming city located in Martin County in the heart of southern Minnesota, serving as the county seat and a vital hub for the surrounding agricultural region. The city carries a single ZIP code — 56031 — and is reached by callers using the 507 area code, which serves a broad swath of southern Minnesota. Known for its scenic chain of lakes and strong community spirit, Fairmont offers residents and visitors a blend of small-town charm and practical amenities.
Location & geography
Fairmont sits in the flat, fertile plains of southern Minnesota, positioned near the Iowa border in Martin County, roughly 150 miles southwest of Minneapolis. Neighboring communities include Sherburn to the west, Blue Earth to the northeast, Jackson to the west-northwest, and Trimont to the northwest, all within a short drive along U.S. and state highways. The city encompasses 156.32 square miles of land alongside 7.67 square miles of water, the latter reflecting the remarkable chain of interconnected lakes — including Sisseton, Budd, Hall, and George lakes — that wind through and around the community.
Community & economy
Fairmont has a tight-knit, family-oriented character shaped by generations of agricultural tradition and a strong local work ethic rooted in the farming communities of Martin County. The local economy draws on manufacturing, healthcare, retail, and agribusiness, with the city acting as a regional center for services including medical care and education. Daily life in Fairmont revolves around community events at Sisseton Lake, local dining along State Street, youth sports programs, and the seasonal rhythms of a town deeply connected to the land around it.
Transportation
Fairmont is conveniently served by Interstate 90, which runs east-west through the city and connects it to Sioux Falls, South Dakota, to the west and Austin, Minnesota, to the east, while U.S. Highway 15 provides a north-south corridor linking the city to communities throughout the region. The Fairmont Municipal Airport offers general aviation services for the area, and for commercial flights, travelers typically drive to Rochester International Airport or Sioux Falls Regional Airport, each roughly 90 to 120 miles away. Local roadways including U.S. Highway 71 further tie Fairmont into the broader network of southern Minnesota towns.
History
Fairmont was platted in the 1870s during the settlement of southern Minnesota, with early growth driven by the arrival of the railroad and the promise of rich prairie farmland that attracted immigrants from Scandinavia, Germany, and the British Isles. The city became the seat of Martin County and developed steadily through the late 19th and early 20th centuries as agriculture, particularly corn and soybean farming, formed the backbone of its economy. Over the decades, Fairmont diversified with the addition of food processing and light manufacturing industries, cementing its role as one of southern Minnesota's most important regional centers.
Did you know?
One surprising aspect of Fairmont is its remarkable chain of five interconnected lakes running directly through the urban landscape, giving this southern Minnesota prairie city a resort-like waterfront character that few comparably sized inland towns can claim. This unique geographic feature has earned Fairmont a reputation as 'The City of Lakes,' a distinction it shares with much larger Minnesota cities but wears with particular pride given its setting amid flat, open farmland.
