County outline
Where Genesee County is located
Area breakdown
Land accounts for 99.5% of Genesee County’s measured area and water for 0.5%. Its combined area converts to 1,282.9 square kilometers or approximately 317,021 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 492.976 | 1,276.802 | 315,504.6 |
| Water | 2.369 | 6.136 | 1,516.2 |
| Total | 495.345 | 1,282.938 | 317,020.8 |
How Genesee County compares
By original Census land area, Genesee County ranks #45 of 62 in New York and #2109 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 0.754 times the New York county-equivalent median of 653.7 square miles. It accounts for 1% of the combined county land area in the state.
See the complete New York ranking · What counts as a county equivalent?
Population and density of Genesee County
The Census Bureau estimates that 58,416 people lived in Genesee County on July 1, 2025. That ranks #923 of 3,222 county equivalents nationally and #44 of 62 in New York. Since the April 1, 2020 estimates base of 58,383, the population has grown by 33 (+0.1%), compared with −1% for New York as a whole.
With 493 square miles of land, that is 118 people per square mile (46 per km²), placing Genesee County #880 nationally for density and #30 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 5.4 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 58,299 | 57,925 | 57,584 | 58,016 | 58,428 | 58,416 |
| Change | — | −374 | −341 | +432 | +412 | −12 |
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 Genesee County
Genesee County is divided into 15 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 Batavia city, with 15,168 residents (26% of the county). The largest by land is Batavia town, at 48.2 mi², or 9.8% of the county’s land. Among those with at least 1,000 residents in 2020, Batavia town grew fastest since then (+6.5%).
| County subdivision | Population 2025 | Since 2020 | Land mi² | Share of county land |
|---|---|---|---|---|
| Batavia cityCounty seat | 15,168 | −0.3% | 5.195 | 1.1% |
| Le Roy town | 7,577 | −1.1% | 42.1 | 8.5% |
| Batavia townCounty seat | 7,096 | +6.5% | 48.2 | 9.8% |
| Pembroke town | 4,292 | +0.6% | 41.6 | 8.4% |
| Bergen town | 3,120 | −0.2% | 27.6 | 5.6% |
| Oakfield town | 3,095 | −1.7% | 23.3 | 4.7% |
| Darien town | 2,985 | −0.8% | 47.4 | 9.6% |
| Alexander town | 2,446 | −1.2% | 35.5 | 7.2% |
| Stafford town | 2,386 | −1.8% | 31.1 | 6.3% |
| Byron town | 2,276 | −1% | 32.2 | 6.5% |
| Pavilion town | 2,254 | −1.4% | 35.6 | 7.2% |
| Elba town | 2,135 | −1% | 35.6 | 7.2% |
| Bethany town | 1,749 | −2% | 36.1 | 7.3% |
| Alabama town | 1,596 | −1.8% | 42.4 | 8.6% |
| Tonawanda Reservation | 241 | 0% | 9.161 | 1.9% |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Genesee County. Land: 2026 Census Gazetteer. How communities are listed.
Metropolitan area
Genesee County is a central county of the Batavia, NY Micropolitan Statistical Area. Genesee County is the area’s only county equivalent, so the micro area has the same 493 square miles of land. By combined land it ranks #439 of 542 micropolitan areas, and #172 by population. It belongs to the Rochester-Batavia-Seneca Falls, NY Combined Statistical Area.
ZIP codes
20 ZIP Code Tabulation Areas have land in Genesee County; 15 of them have most of their land inside the county, and the others mainly cover neighboring areas.
1400114004140051401114013140201403614040140541405614058141051412514143144161442214482145251455714591
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 Genesee County
Genesee County shares a land border with 6 county equivalents. It has more land than 1 of them. The largest neighbor is Erie County (1,042.8 mi²) and the smallest is Orleans County (391.3 mi²). Together with its neighbors, Genesee County forms a block of 4,330.7 mi² of land, of which it holds 11.4%.
| Bordering county equivalent | Land mi² | Size vs. Genesee | Compare |
|---|---|---|---|
| Erie County | 1,042.8 | 2.1× larger | Compare |
| Monroe County | 657 | 1.3× larger | Compare |
| Livingston County | 631.7 | 1.3× larger | Compare |
| Wyoming County | 592.7 | 1.2× larger | Compare |
| Niagara County | 522.3 | 1.1× larger | Compare |
| Orleans County | 391.3 | 1.3× smaller | Compare |
How big is Genesee County compared with U.S. states?
Genesee County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 2.1 times as much. New York’s county land could hold about 96 areas the size of Genesee County.
Another way to picture it: the same land area would fill a square about 22.2 miles (35.7 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 Genesee County?
Genesee County has more land than 1,113 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 Genesee County at #2,201 nationally by total area, 92 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 0.5%, compared with a national county-equivalent median of 1.2% — 0.7 percentage points lower. 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 Genesee County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #2108 | Montgomery County, Maryland | 493.1 | Compare |
| #2109 | Genesee County, New York | 493 | This county |
| #2110 | Pemiscot County, Missouri | 492.6 | Compare |
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.
Representative coordinates
The Census internal point is 43.000910, -78.192778. It represents a location inside the geography; it is not necessarily the centroid or the address of a courthouse.
Source and precision
U.S. Census Bureau, 2026 Gazetteer Files, Counties. Original ALAND: 1,276,803,036 m²; AWATER: 6,136,679 m². Rankings use ALAND; exact ties use ascending GEOID. Tables preserve Census-published square miles to three decimals, with conversions based on those values.
Common questions
How big is Genesee County?
Genesee County, New York has 493 square miles (1,276.8 km²) of land and 2.369 square miles of water, for a total area of 495.3 square miles. It ranks #2109 of 3,222 U.S. county equivalents by land area.
Is Genesee County the largest county in New York?
No. Genesee County ranks #45 of 62 in New York by land area. The largest is St. Lawrence County, with 2,679.5 square miles of land.
What counties border Genesee County?
Genesee County shares a land border with Wyoming County, Orleans County, Erie County, Monroe County, Livingston County, and Niagara County.
What is the population of Genesee County?
The Census Bureau estimates Genesee County had 58,416 residents on July 1, 2025, ranking #923 of 3,222 county equivalents. That is 118 people per square mile of land.
What is the county seat of Genesee County?
The county seat of Genesee County is Batavia.
What cities and towns are in Genesee County?
Genesee County has 15 county subdivisions (cities, towns and townships). The most populous five are Batavia city, Le Roy town, Batavia town, Pembroke town, and Bergen town.
Is Genesee County part of a metropolitan area?
Yes. It is a central county of the Batavia, NY Micropolitan Statistical Area.
How many ZIP codes are in Genesee County?
20 ZIP Code Tabulation Areas have land in Genesee County, and 15 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Genesee County compare with U.S. states?
It has less land than every state. Rhode Island, the smallest, has 2.1 times as much land.
How many acres of land are in Genesee County?
The land measurement converts to approximately 315,505 acres. Including water, total area is approximately 317,021 acres. One square mile equals 640 acres.
Why might another source show a different area?
Check whether it reports land or total area, its Census vintage, and its rounding. Our guide explains how to reconcile county area figures.
Can this establish a property boundary?
No. Statistical measurements and generalized maps do not establish property lines. Consult the relevant local surveying or land-records authority.