Lewis County area

Population and density of Lewis County

The Census Bureau estimates that 26,479 people lived in Lewis County on July 1, 2025. That ranks #1,602 of 3,222 county equivalents nationally and #59 of 62 in New York. Since the April 1, 2020 estimates base of 26,595, the population has declined by 116 (−0.4%), compared with −1% for New York as a whole.

With 1,276.3 square miles of land, that is 21 people per square mile (8 per km²), placing Lewis County #2,298 nationally for density and #60 in New York. The median county equivalent has 47 people per square mile; the New York median is 112. Put another way, there are about 31 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Lewis County

Lewis County is divided into 17 cities and towns. In New York, county subdivisions are local governments, and together they cover all of the county’s land and residents.

The most populous is Lowville town, with 4,869 residents (18.4% of the county). The largest by land is Croghan town, at 179 mi², or 14% of the county’s land. Among those with at least 1,000 residents in 2020, Greig town grew fastest since then (+0.5%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Lewis County. Land: 2026 Census Gazetteer. How communities are listed.

Metropolitan area

Lewis County is not part of any metropolitan or micropolitan statistical area in the Office of Management and Budget’s July 2023 delineation; 1,306 other county equivalents are also outside one. These areas are built around an urban core of at least 10,000 people plus the counties tied to it by commuting, so counties outside them are generally rural.

ZIP codes

23 ZIP Code Tabulation Areas have land in Lewis County; 16 of them have most of their land inside the county, and the others mainly cover neighboring areas.

1330513309133121331613325133271334313345133671336813404134331343713471134731348913601136191362013626136481366513682

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Lewis County

Lewis County shares a land border with 5 county equivalents. It has more land than 3 of them. The largest neighbor is St. Lawrence County (2,679.5 mi²) and the smallest is Oswego County (951.6 mi²). Together with its neighbors, Lewis County forms a block of 8,798.4 mi² of land, of which it holds 14.5%.

How big is Lewis County compared with U.S. states?

Lewis County has more land than 1 of the 50 states. It is about 1.2 times the land area of Rhode Island (1,033.9 mi²), while Delaware, the next larger state, has 1.5 times as much land (1,948.6 mi²). New York’s county land could hold about 37 areas the size of Lewis County.

Another way to picture it: the same land area would fill a square about 35.7 miles (57.5 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Lewis County?

Lewis County has more land than 2,749 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Lewis County at #538 nationally by total area, 65 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 1.2%, compared with a national county-equivalent median of 1.2%. The two percentages are within 0.1 percentage points of each other. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Lewis County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.