Lewis County, New York
County seat: Lowville · Population 26,479 (2025) · 1,276 sq mi
Lewis County is the 59th most populous of New York's 62 counties, with 26,479 people (2025 estimate). Its county seat is Lowville. The map shows its 8 cities and towns and the 5 neighboring counties.
Lewis County facts
- County seat
- Lowville
- Population (2025 estimate)
- 26,479 −0.4% since 2020
- Land area
- 1,276 sq mi 9th largest of 62
- Water area
- 15 sq mi
- Population density
- 21 per sq mi
- Established
- 1805
- Same name
- One of 7 Lewis Counties in the US
- Named after
- Morgan Lewis American lawyer, politician and military commander (1754–1844)
- Largest city
- Lowville 4,869
- Median household income
- $68,182
- Cities and towns
- 8
- ZIP codes
- 23
- Time zone
- Eastern
- FIPS code
- 36049
Cities and towns in Lewis County
Lewis County has 8 incorporated cities, towns and villages. Populations count the people living inside Lewis County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Lowville (county seat) | Village | 3,309 | |
| Copenhagen | Village | 659 | |
| Croghan | Village | 632 | |
| Port Leyden | Village | 588 | |
| Lyons Falls | Village | 587 | |
| Castorland | Village | 341 | |
| Constableville | Village | 303 | |
| Turin | Village | 214 |
ZIP codes in Lewis County
23 ZIP codes reach into Lewis County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 13305
- 13309 also Oneida County
- 13312
- 13316 also Oneida and Oswego counties
- 13325
- 13327
- 13343
- 13345
- 13367 also Herkimer County
- 13368
- 13404
- 13433
- 13437 also Oswego County
- 13471 also Oneida County
- 13473
- 13489
- 13601 also Jefferson County
- 13619 also Jefferson County
- 13620
- 13626 also Jefferson County
- 13648 also St. Lawrence County
- 13665 also Jefferson County
- 13682 also Jefferson County
Population of Lewis County, 2020–2025
Lewis County shrank by 116 people (−0.4%) between April 2020 and July 2025: 19 more deaths than births and a net loss of 102 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 26,571 |
| 2021 | 26,739 |
| 2022 | 26,616 |
| 2023 | 26,568 |
| 2024 | 26,512 |
| 2025 | 26,479 |
Neighboring counties
- Jefferson County northwest · 111,540 people
- Oneida County south · 226,392 people
- Herkimer County southeast · 59,219 people
- St. Lawrence County north · 105,488 people
- Oswego County southwest · 118,569 people
Printable Lewis County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (94 KB)
- PNG (2400 px) (91 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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