Local servicesHospitalWashington County Memorial Hospital9.8 miPost officeTiff Post Office1.3 miTown hallDe Soto City Hall9.1 miPoliceTerre Du Lac Police Department8.2 miFire stationPotosi Fire Protection District House 33.6 miSource: USGS National Structures Dataset
Getting aroundAirportSt. Louis Lambert International Airport STL52 miInterstateI-5518 miUS highwayUS 677.8 miAmtrakArcadia, MO ACD31 miSources: OurAirports; US Census Bureau TIGER roads; Bureau of Transportation Statistics NTAD
Distances in these cards are measured from the centre of the 63674 ZIP area.
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Local Information
Distances in these cards are measured from the centre of the 63674 ZIP area.
Daylight through the yearLongest day (Jun 21): 14 h 49 min5:40 am – 8:28 pmShortest day (Dec 21): 9 h 31 min7:15 am – 4:46 pm
Sun todaySunrise –Sunset –
People53 residentsin the ZIP code areaMedian age 62.732 households100% of homes owner-occupiedSource: US Census Bureau, American Community Survey 2019-2023
ClimateWarmest month July: highs 86°F, lows 67°FColdest month January: highs 40°F, lows 21°F45 in of rain a year, on about 73 dayswettest month May12 in of snow a year, on about 9 days23 days above 90°F, 103 nights below freezing in a typical yearSource: NOAA 1991-2020 Climate Normals, Potosi 4 Sw station, 14 mi away
Parks and public landsWashington State Parkstate park · 2.5 mi · 1,784 acresMo Dnr (Washington State Park Access)state park · 3.4 miWashington State Park Hardwoods Natural Areastate conservation land · 3.4 mi · 63 acresKingston Accessstate recreation area · 4.7 mi · 56 acresSaint Francois State Parkstate park · 7.6 mi · 2,530 acresMerrill Horse Accessstate recreation area · 8.9 mi · 80 acresSource: USGS Protected Areas Database (PAD-US)
Earthquakes9 of magnitude 3 or more within 50 miles since 19701 of magnitude 4+, 0 of magnitude 5+Largest: magnitude 4.2 on 11 Dec 197623 mi away, near Sullivan, MissouriMost recent: magnitude 3.9 on 7 Jun 201114 mi awaySource: USGS Earthquake Catalog
Natural hazardsOverall risk Relatively LowWashington County, MO, compared with all US countiesHighest-rated hazardsHeat wave Relatively ModerateCold wave Relatively ModerateSource: FEMA National Risk Index (county level)
Air quality73% of days had good air in 2025268 of 365 days measured93 moderate, 4 unhealthy for sensitive groups daysMedian index 42, worst day 150main pollutant: fine particles (PM2.5)Source: US EPA Air Quality Index, nearest monitors: Jefferson County, MO, 17 mi away
Internet at home100% of households have a broadband subscription63% have cable, fibre or DSL0% rely on a mobile data plan alone0% have no internet at homeSource: US Census Bureau, American Community Survey 2019-2023
Drinking waterPotosi PWSserves 2,527 people from ground waterNo health-based violations since 20213 monitoring or reporting violations since 2021Source: US EPA Safe Drinking Water Information System, largest system in the county
Elevation791 ft241 m above sea levelSource: USGS 3D Elevation Program
