St. Lawrence County GIS Maps
St. Lawrence County, New York, has 108,505 residents across 67,595 parcels and covers 2,679.3 square miles. The population declined 3.1% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for St. Lawrence County is 36089.
Massena is the county's largest population center. St. Lawrence County also includes 45 zip codes, 22 public school districts and 45 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show parcel data, population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers, Parcels and sample data. Paid packages add full layers, analytics and database files.
St. Lawrence County Trends
- Population
- 108,505▾
- Median Home Value
- $119,800▴
- K-12 Enrollment
- 16,473▾
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
St. Lawrence County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
St. Lawrence County Parcels
St. Lawrence County has 67,595 mapped parcels covering 1,817,475 acres. The median assessed value is $59,500. The median lot size is 3.06 acres. 16,767 parcels are 10 acres or larger. Of the parcels with a recorded build year, half were built in 1953 or earlier. The records carry 47,001 distinct owner names. About 7% of parcels list an owner mailing address outside New York. Owner names, site addresses, assessed values and lot sizes are on nearly every parcel. Mailing addresses reach 88.0%. Browse the interactive St. Lawrence County Parcel viewer here.
St. Lawrence County Parcel Data Coverage
| Field | Parcels | Coverage |
|---|---|---|
| Parcel ID | 67,595 | 100% |
| Owner name | 67,357 | 99.6% |
| Owner mailing address | 59,474 | 88.0% |
| Site address | 67,594 | 99.9% |
| Land use code | 67,355 | 99.6% |
| Land use description | 3,205 | 4.7% |
| Assessed value | 67,355 | 99.6% |
| Land value | 67,355 | 99.6% |
| Improvement value | 0 | 0% |
| Acreage | 67,353 | 99.6% |
| Parcel boundary | 67,595 | 100% |
| Download all St. Lawrence County parcels. | ||
Field coverage measured across all St. Lawrence County parcel records.
St. Lawrence County Population
St. Lawrence County had 108,505 residents in 2020. That was 3.1% lower than in 2010. St. Lawrence County had 3,426 fewer people in 2020 than it did in 2000, which points to a long-term population decline. The county is fairly spread out, with about 40 people per square mile. Some of the county's most populated postal areas include Massena, Ogdensburg and Potsdam.
Population Trend in St. Lawrence County NY
St. Lawrence County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
St. Lawrence County Zip Codes
St. Lawrence County has 45 zip codes. Some of the county's most populated zip codes include Massena (13662), Ogdensburg (13669) and Potsdam (13676). Massena is the largest zip by population, with about 15,814 residents or 15% of the county total. Together, the three largest zips account for about 41% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in St. Lawrence County NY
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 13662 | Massena | 15,814 | ▾ -4.6% |
| 13669 | Ogdensburg | 14,990 | ▾ -8.9% |
| 13676 | Potsdam | 13,211 | ▾ -20.6% |
| 13617 | Canton | 12,083 | ▴ 6.9% |
| 13642 | Gouverneur | 9,397 | ▾ -6.8% |
| Download all zip code data | |||
St. Lawrence County Zip Code populations and trends per most recent census data.
St. Lawrence County Demographics
St. Lawrence County has a median age of 39, which makes the county a little younger than New York overall. About 20.1% of residents are under 18, while 18.4% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 27.6% of the population, which points to a solid working-age base. About 24.6% of adults have a bachelor's degree or higher, above the statewide figure of 39.6%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for St. Lawrence County NY
Median Age
39
Under 18
20.1%
Age 65+
18.4%
Bachelor's+
24.6%
St. Lawrence County School Districts
St. Lawrence County is served by 22 public school districts with 16,473 students enrolled in 2024. The largest districts on the county map are Massena Central, Gouverneur Central and Salmon River Central. Those three districts account for about 32% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in St. Lawrence County NY
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Massena Central School District | 2,469 | 15% | ▴ 2.4% |
| Gouverneur Central School District | 1,408 | 8.5% | ▾ -1% |
| Salmon River Central School District | 1,373 | 8.3% | ▴ 0.4% |
| Ogdensburg City School District | 1,354 | 8.2% | ▾ -4.4% |
| Potsdam Central School District | 1,292 | 7.8% | ▾ -0.8% |
| Download all school district data | |||
St. Lawrence County school district enrollment and trends per most recent NCES reporting data.
St. Lawrence County Housing & Real Estate
St. Lawrence County has a median home value of $119,800 and a median gross rent of $799. About 72% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the New York median, while rents come in below the state average. In March 2026, the median listing price was $178,950 and homes spent about 136 days on the market.
St. Lawrence County Housing Mix
St. Lawrence County housing mix: owner, renter and vacant units.
St. Lawrence County Housing Trends
St. Lawrence County median home value and rent trend (last 5 years).
Businesses in St. Lawrence County, NY
St. Lawrence County has 4,191 business listings across 594 categories. The largest categories in St. Lawrence County business listings are Churches & Religious Organizations (130, 3.1%), Medical Offices (76, 1.8%), and Convenience Stores (74, 1.8%). The full St. Lawrence County business listings dataset includes names, categories, addresses and contact details where available. St. Lawrence County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in St. Lawrence County, NY
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 130 | 3.1% |
| Medical Offices | 76 | 1.8% |
| Convenience Stores | 74 | 1.8% |
| Auto Repair | 72 | 1.7% |
| Farm | 66 | 1.6% |
| Structure And Geography | 60 | 1.4% |
| Community & Nonprofits | 58 | 1.4% |
| Landmark And Historical Building | 57 | 1.4% |
| Parks & Recreation | 53 | 1.3% |
| Public And Government Association | 47 | 1.1% |
St. Lawrence County Business Listings
| Business | Category | City |
|---|---|---|
| St. Lawrence Chemical Dependency Services | Abuse And Addiction Treatment | Canton |
| The College Store | Academic Bookstore | Potsdam |
| Knowles Hall | Accommodation | Potsdam |
| Pinto Mucenski Hooper VanHouse & Co. | Accountant | Potsdam |
| Stone Valley Trail | Active Life | Colton |
| Light Touch Acupuncture & Apothecary | Acupuncture | Massena |
| Northern New York Newspapers | Advertising Agency | Canton |
| My Farm Parts | Agricultural Service | Hermon |
| Wight and Patterson | Agriculture | Canton |
| Massena International Airport | Airport | Massena |
| Download St. Lawrence County business listings | ||
St. Lawrence County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Get the Full St. Lawrence County Data Package
This page shows a preview of what's included in the St. Lawrence County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for parcels, zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border St. Lawrence County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.