Louisville is a town in St. Lawrence County, New York, home to about 3,013 people across 49 square miles. Its ZIP code is 13621, and parts of 13662 and 13667 are in Louisville too.
Homes sold for a median of $139 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Louisville; also Madrid and Norfolk
Mostly Massena; part is in Louisville
Mostly Norfolk; part is in Louisville
Each card is that ZIP code’s whole market, including any part outside Louisville. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Louisville’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Syracuse Hancock International Airport (SYR)136 miles away |
|---|---|
| Closer regional airport | Massena International Airport Richards Field (MSS)6 miles away |
| Nearest city of 250,000+ | Buffalo, NY239 miles away |
| Nearest city of 1 million+ | New York, NY297 miles away |
Straight-line distances from the center of Louisville; 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.
Louisville had 3,050 residents in the 2020 census, down 5% since 2000.
It’s the 516th largest of 1,007 towns in New York by population.
St. Lawrence County grew from 89,083 residents in 1900 to 108,505 in 2020.
St. Lawrence County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 81°F in summer, and winter lows average 6°F. About 33.9 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Massena Intl Ap, NY weather station (6 miles away).
26,395 jobs at 1,826 businesses in St. Lawrence County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
1 doctors and other health care providers list an office in Louisville.
Nearest hospitals
Providers with an office here
| Nurse practitioners and physician assistants | 1 |
|---|
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 (11 nearby)
Grocery stores (3 nearby)
Pharmacies (4 nearby)
Libraries (1 nearby)
Museums (1 nearby)
Counts are within about 4.5 miles 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.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
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Shares ZIP codes with Massena, Norfolk, Madrid, Brasher and Waddington.
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.