Niagara County, New York

A county in New York, ranked 18 of 62 by population.

CountyFIPS 36063

Within New York

Niagara County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Lockport, the county seat, located via the 2025 Census Gazetteer.

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Population: 208,912; -3,206 (-1.5%) since 2020
Land area: 522.3; square miles. A further 54.2% of the total area is water
Population density: 400; people per square mile, computed rather than published
County seat: Lockport; Seat of county government.
Established: 1808; 217 years ago
Largest city: Niagara Falls city; Population 47,255.

Satellite view

Aerial imagery of Niagara County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Niagara County, New York from the USGS National Map, with its boundary outlined — Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 653 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Niagara County ranks

Position among the 62 counties of New York, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

Measure	Value	In New York	Nationally
Population	208,912	18th of 62	348th of 3,144
Land area	522.3 sq mi	41st of 62	1,998th of 3,144
Population density	400 per sq mi	17th of 62	345th of 3,144
Median household income	$69,633	38th of 62	1,225th of 3,143

Full data for Niagara County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
Measure	Value	Source and vintage
Population	208,912	Vintage 2025 Population Estimates
Population in 2020	212,118	Vintage 2025 Population Estimates
2020 estimates base?	212,671	Vintage 2025 Population Estimates
Land area	522.3 sq mi	2025 Gazetteer Files
Water area	617.3 sq mi	2025 Gazetteer Files
Total area	1,140 sq mi	2025 Gazetteer Files
Population density?	400 per sq mi	Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income	$69,633	American Community Survey 2020-2024 5-Year Estimates
Median home value	$189,800	American Community Survey 2020-2024 5-Year Estimates
Median age	43.3	American Community Survey 2020-2024 5-Year Estimates
Households	91,884	American Community Survey 2020-2024 5-Year Estimates
Housing units	100,446	American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths: -682; 1,845 births, 2,527 deaths
Net migration: +199; More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 3 areas bordering Niagara County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering area	State	Shared border	Population
Erie County	New York	53 mi	946,741
Orleans County	New York	35 mi	39,825
Genesee County	New York	2.8 mi	58,416

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 62 counties of New York

Open the interactive New York county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.