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Mille Lacs County, Minnesota

Natural disaster risk, federal disaster history and flood insurance facts.

Very Low overall risk
56th of 87highest risk in Minnesota
$11Mexpected losses a year
8federal declarations
1 in 250homes with flood insurance
Photo: U.S. Geological Survey, public domain

Mille Lacs County, Minnesota has a very low overall risk from natural hazards in FEMA's National Risk Index. Its risk score is lower than 72% of US counties. It ranks 56th of 87 counties in Minnesota. The costliest hazards here are inland flooding, cold waves and tornadoes. FEMA estimates about $11 million a year in expected losses, or roughly $427 per resident. Since 1965 it has been included in 8 federal disaster or emergency declarations for natural events (6 major disasters). The most recent was in July 2023 (severe storms and flooding). Fewer than 1 in 100 homes here carry federal flood insurance (57 policies). Since 1978, federal flood insurance has paid about $119,000 on 24 claims here.

FEMA National Risk Index December 2025; OpenFEMA declarations to Nov 6, 2026; NFIP records. Updated November 6, 2026.

Top risks in Mille Lacs County

$7.1 million a yearExpected losses. Damaging events about once every 2 years.
  • Check the FEMA flood map for your address, and ask the seller or landlord about past flooding.
  • Price a flood policy now. Most new federal policies take 30 days to start.
$1.9 million a yearExpected losses. Damaging events about 12 times a year.
  • Insulate pipes in outside walls, crawl spaces and garages.
  • Know how to shut off the main water valve.
$644,640 a yearExpected losses. Damaging events about once every 4 years.
  • Pick a shelter spot: a basement, or an inside room on the lowest floor with no windows.
  • Turn on emergency alerts on your phone and keep a weather radio.
HazardRatingScoreExpected loss a year
Inland floodingLow46.2
$7M
Cold waveLow62.8
$2M
TornadoLow30.8
$645K
Strong windLow43.8
$552K
HailLow56.7
$406K
LightningLow40.2
$193K
WildfireLow65.8
$151K
Heat waveVery Low28.6
$148K
DroughtLow39.1
$73K
Ice stormLow27.6
$33K
Winter weatherLow25.5
$29K
EarthquakeVery Low3.1
$4K
LandslideVery Low32.9
$464

Scores are percentiles: a score of 90 means higher risk than about 90% of US counties for that hazard. Hazards FEMA does not rate here are left out. Social vulnerability is very low and community resilience is very high in FEMA's measures.

Federal disaster history

Recent disasters nationwide ›

Declarations by decade

Federal declarations for natural events that included Mille Lacs County. 2020s bar runs to November 2026.

By type

Flood5
Drought1
Hurricane1
Severe Storm1

Most recent

Jul 19, 2023Severe Storms and FloodingMajor disaster
Jul 28, 2011Severe Storms, Flooding, and TornadoesMajor disaster
Sep 13, 2005Hurricane Katrina EvacuationEmergency
May 16, 2001Severe Winter Storms, Flooding, and TornadoesMajor disaster
Jun 17, 1976DroughtEmergency
Aug 1, 1972Severe Storms & FloodingMajor disaster
Apr 18, 1969FloodingMajor disaster
Apr 11, 1965FloodingMajor disaster

Minnesota also had 26 statewide declarations that did not name single counties.

Storm history since 1955

Tornado risk by county ›

The National Weather Service has logged 252 storm reports in Mille Lacs County since 1955, with 1 death and 5 injuries and about $1.8 million in reported damage. The strongest on record here was an F3 tornado on September 18, 1997 near Onamia.

16tornadoes
110hail reports, largest 3.2 inches
112damaging thunderstorm winds
9floods and flash floods

Strongest tornadoes

DateStrengthNearHurt / killed
Sep 18, 1997F3Onamia0 / 0
Jul 8, 1959F2–0 / 0
Jul 3, 1985F2–0 / 0
Jul 21, 1995F2Long Siding0 / 0
Sep 16, 1955F1–0 / 1

Most damaging storms

DateTypeNearDamage
Apr 22, 2001Flash FloodCountywide$300K
Sep 16, 1955Tornado–$250K
Jul 8, 1959Tornado–$250K
Aug 14, 2020Thunderstorm WindOnamia$250K
Aug 26, 2019TornadoMilaca$200K
Jul 17, 2001Thunderstorm WindVineland$100K

Source: NOAA Storm Events Database, county-based reports through Jul 4, 2026. Tornado records start in 1950, hail and wind in 1955, and floods and other storm types in 1996, so older decades undercount. Damage is in dollars of the year it happened and is often an estimate. Winter storms, heat and hurricanes are logged by forecast zone, not county, so they are not counted here.

Flood insurance in Mille Lacs County

Check your address flood zone ›
0.4%of homes have federal flood insurance (57 policies)
7.8%of homes in mapped high-risk flood zones are insured
$118,930paid on 24 flood claims since 1978
2014costliest year, with $36,268 paid

National Flood Insurance Program (NFIP) records only; private flood policies are not included. Home counts as of Aug 3, 2026. Since 2021 NFIP prices each home separately under Risk Rating 2.0, so your price depends on the building, not the county. Ask an agent for a quote.

Homes in Mille Lacs County

$258,300median home value (Minnesota $329,300, US $332,700)
1982median year homes were built (Minnesota 1979, US 1980)
48%of homes built before 1980, before many modern wind, quake and flood building rules
9.9%of homes are mobile homes, which are the least safe in tornadoes and high winds

Older homes and mobile homes usually suffer more damage in storms, floods and earthquakes, and can cost more to insure. If you are buying, ask about roof age, foundation bolting and any retrofits. Source: US Census Bureau, American Community Survey 2020 to 2024 5-year estimates; 13,069 housing units.

Compare in Minnesota

All 87 ›
Largest countiesOverall riskTop hazard
Hennepin CountyHighInland flooding
Ramsey CountyHighInland flooding
Dakota CountyModerateInland flooding
Anoka CountyModerateInland flooding
Washington CountyModerateInland flooding
St. Louis CountyModerateCold wave
Olmsted CountyModerateInland flooding
Stearns CountyModerateInland flooding

Neighboring counties

CountyOverall riskDeclarations
Sherburne CountyLow8
Crow Wing CountyLow11
Benton CountyLow11
Isanti CountyVery Low8
Morrison CountyLow12
Kanabec CountyVery Low9
Aitkin CountyLow19

Common questions about Mille Lacs County

What is the biggest natural hazard in Mille Lacs County?

Inland flooding has the highest expected yearly losses in Mille Lacs County, about $7.1 million a year in FEMA's estimate. Cold wave is second at $1.9 million.

How many federal disasters has Mille Lacs County had?

Mille Lacs County has been included in 8 federal disaster or emergency declarations for natural events since 1965, including 6 major disasters. The most recent was Severe Storms and Flooding in July 2023.

Is Mille Lacs County a high-risk place to live?

Its overall rating is Very Low, 56th highest of 87 in Minnesota. A county rating covers the whole area. Risk at one address can be much higher or lower, so check the FEMA flood map and ask about the home's history.

Do I need flood insurance in Mille Lacs County?

Standard home insurance does not cover flooding. About 1 in 250 homes in Mille Lacs County has federal flood insurance. Lenders require it in mapped high-risk zones, but many flood claims come from outside those zones.

How many tornadoes has Mille Lacs County had?

NOAA records list 16 tornadoes in Mille Lacs County since 1950. The strongest was an F3 tornado on September 18, 1997 near Onamia. The weather service has also logged 110 hail reports and 9 floods here.

Sources: FEMA National Risk Index (December 2025), OpenFEMA Disaster Declarations Summaries, and NFIP policy and claims data. Hazard Compass is independent and not affiliated with FEMA. These figures describe the whole county, not a single property, and are not insurance or safety advice. Report a problem.