Lake Seneca is a community in Williams County, Ohio, home to about 532 people across 1.4 square miles. It has no ZIP code of its own: it’s part of 43543.
Homes sold for a median of $128 per square foot in the three months ending August 2026, a seller’s market.
Mostly Montpelier; part is in Lake Seneca
Each card is that ZIP code’s whole market, including any part outside Lake Seneca. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Lake Seneca’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Detroit Metropolitan Wayne County Airport (DTW)77 miles away |
|---|---|
| Closer regional airport | Eugene F. Kranz Toledo Express Airport (TOL)42 miles away |
| Nearest city of 250,000+ | Fort Wayne, IN45 miles away |
| Nearest city of 1 million+ | Chicago, IL159 miles away |
Straight-line distances from the center of Lake Seneca; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Lake Seneca had 529 residents in the 2020 census, up 14% since 2010.
It’s the 870th largest of 1,264 towns in Ohio by population.
Williams County grew from 24,953 residents in 1900 to 37,102 in 2020.
Williams County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 83°F in summer, and winter lows average 17°F. About 37.9 inches of rain and melted snow fall in a typical year, with about 33 inches of snow.
Source: NOAA 1991–2020 climate normals, Montpelier, OH weather station (about a mile away).
16,283 jobs at 802 businesses in Williams County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
23 doctors and other health care providers list an office in Lake Seneca.
Nearest hospitals
Providers with an office here
| Primary care doctors | 6 |
|---|---|
| Specialist doctors | 1 |
| Dentists | 3 |
| Nurse practitioners and physician assistants | 6 |
| Mental health providers | 1 |
| Physical and occupational therapists | 2 |
| Optometrists | 2 |
| Chiropractors | 2 |
| Pharmacies | 3 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (2 nearby)
Libraries (2 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Montpelier Exempted Village. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Montpelier Elementary SchoolMontpelier | Pre-K–7 | 471 | Public | 1.9 mi |
| Montpelier High SchoolMontpelier | 7–12 | 316 | Public | 1.9 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Montpelier, Nettle Lake and Holiday City.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.