County Maps US

Tompkins County, New York

A county in New York, ranked 28 of 62 by population.

CountyFIPS 36109

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

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Population
104,047
-1,461 (-1.4%) since 2020
Land area
474.7
square miles. A further 3.4% of the total area is water
Population density
219
people per square mile, computed rather than published
County seat
Ithaca
Seat of county government.
Established
1817
208 years ago
Largest city
Ithaca city
Population 33,632.

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; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Tompkins 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 Tompkins 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 749 by 800 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 Tompkins 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.

MeasureValueIn New YorkNationally
Population104,04728th of 62605th of 3,144
Land area474.7 sq mi46th of 622,170th of 3,144
Population density219 per sq mi22nd of 62538th of 3,144
Median household income$74,02425th of 62909th of 3,143

Full data for Tompkins County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population104,047Vintage 2025 Population Estimates
Population in 2020105,508Vintage 2025 Population Estimates
2020 estimates base?105,735Vintage 2025 Population Estimates
Land area474.7 sq mi2025 Gazetteer Files
Water area16.9 sq mi2025 Gazetteer Files
Total area491.6 sq mi2025 Gazetteer Files
Population density?219 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$74,024American Community Survey 2020-2024 5-Year Estimates
Median home value$290,900American Community Survey 2020-2024 5-Year Estimates
Median age32.3American Community Survey 2020-2024 5-Year Estimates
Households43,263American Community Survey 2020-2024 5-Year Estimates
Housing units47,804American 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
-130
655 births, 785 deaths
Net migration
-221
More people moved out than moved in.

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

The 6 areas bordering Tompkins 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 areaStateShared borderPopulation
Tioga CountyNew York34 mi47,453
Schuyler CountyNew York22 mi16,924
Cayuga CountyNew York21 mi74,365
Cortland CountyNew York15 mi45,850
Seneca CountyNew York12 mi32,883
Chemung CountyNew York4.2 mi80,415

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.