County facts · Population growth · October 24, 2026
Fastest Growing Counties in New York, 2020 to 2025
New York's fastest growing counties by percent and by people added, April 2020 to July 2025 Census estimates, with each official parcel map.
Looking for the fastest growing counties in New York? From the Census Bureau's April 1, 2020 estimates base to its July 1, 2025 estimate, New York went from about 20,203,696 to 20,002,427 residents, a change of −201,269 (−1.0%). The fastest growing county by percentage was Rockland County (+5.6%), while Suffolk County added the most people (+20,170, +1.3%).
Every row below links to the county's Platbookmapper page and straight to its official parcel viewer, handy if growth is why you are looking at land there.
New York growth at a glance
- Counties: 62
- Statewide, April 2020 to July 2025: −201,269 residents (−1.0%); July 2024 to July 2025 alone: +1,008 (+0.0%)
- Grew: 21 of 62 · Lost residents: 41
- Fastest growing by percent: Rockland County (+5.6%); most people added: Suffolk County (+20,170)
- Counties with more deaths than births over the period: 47 of 62
The 10 fastest growing New York counties by percent
| # | County | Apr 2020 | Jul 2025 | Change | % change | Parcel viewer |
|---|---|---|---|---|---|---|
| 1 | Rockland County | 338,332 | 357,397 | +19,065 | +5.6% | county web map |
| 2 | Orange County | 401,312 | 417,669 | +16,357 | +4.1% | listed link under review |
| 3 | Otsego County | 58,510 | 60,589 | +2,079 | +3.6% | NYS Tax Parcels Public layer in ArcGIS Map Viewer |
| 4 | Schenectady County | 158,041 | 162,581 | +4,540 | +2.9% | Beacon (Schneider Geospatial) |
| 5 | Sullivan County | 78,618 | 80,586 | +1,968 | +2.5% | ArcGIS |
| 6 | Saratoga County | 235,501 | 241,343 | +5,842 | +2.5% | county web map |
| 7 | Albany County | 314,840 | 321,225 | +6,385 | +2.0% | ArcGIS Web AppBuilder |
| 8 | Schoharie County | 29,715 | 30,176 | +461 | +1.6% | ArcGIS Map Viewer |
| 9 | Putnam County | 97,680 | 99,028 | +1,348 | +1.4% | Beacon (Schneider Geospatial) |
| 10 | Suffolk County | 1,525,920 | 1,546,090 | +20,170 | +1.3% | county web map |
These 10 added about 78,215 people combined. The median county changed by −1.4%.
The 10 counties that added the most people
| # | County | People added | % change | Jul 2025 | Parcel viewer |
|---|---|---|---|---|---|
| 1 | Suffolk County | +20,170 | +1.3% | 1,546,090 | county web map |
| 2 | Rockland County | +19,065 | +5.6% | 357,397 | county web map |
| 3 | Orange County | +16,357 | +4.1% | 417,669 | listed link under review |
| 4 | Westchester County | +11,287 | +1.1% | 1,015,743 | ArcGIS Experience Builder |
| 5 | Albany County | +6,385 | +2.0% | 321,225 | ArcGIS Web AppBuilder |
| 6 | Saratoga County | +5,842 | +2.5% | 241,343 | county web map |
| 7 | Richmond County | +5,038 | +1.0% | 501,290 | county web map |
| 8 | Schenectady County | +4,540 | +2.9% | 162,581 | Beacon (Schneider Geospatial) |
| 9 | Dutchess County | +3,690 | +1.2% | 300,708 | county web map |
| 10 | Nassau County | +3,163 | +0.2% | 1,398,939 | county web map |
The top 10 account for about 91% of all the gains in the counties that grew.
Where the new residents came from
The Census Bureau splits each change into natural change (births minus deaths), net domestic migration (moves from other parts of the US) and net international migration. Totals for April 2020 to July 2025 in the five fastest growing counties:
| County | Births minus deaths | Net domestic moves | Net international moves | Total change |
|---|---|---|---|---|
| Rockland County | +20,905 | −18,699 | +16,488 | +19,065 |
| Orange County | +12,919 | −6,843 | +9,973 | +16,357 |
| Otsego County | −1,044 | +2,998 | +379 | +2,079 |
| Schenectady County | +162 | +2,488 | +2,030 | +4,540 |
| Sullivan County | +563 | −277 | +1,798 | +1,968 |
In 2 of these 5, moves from elsewhere in the US were the biggest source of growth. The three parts do not add up exactly to the total because the Census Bureau also carries a small residual.
The last year alone: July 2024 to July 2025
- Montgomery County: +0.9% (+466)
- Rockland County: +0.7% (+2,568)
- Westchester County: +0.7% (+6,578)
- Seneca County: +0.6% (+212)
- Saratoga County: +0.6% (+1,509)
2 of these 5 are also in the 2020–2025 top 10.
Counties losing residents
41 of New York's 62 counties had fewer residents in July 2025 than in April 2020. The steepest declines:
- Schuyler County: −5.4% (−968, now about 16,924)
- Bronx County: −4.5% (−66,308, now about 1,406,332)
- Chemung County: −4.4% (−3,733, now about 80,415)
- Jefferson County: −4.4% (−5,170, now about 111,540)
- Chenango County: −3.2% (−1,514, now about 45,715)
What fast growth means on a parcel map
- New lots show up as plats first. When land is subdivided, the plat is recorded with the county and the parcel layer catches up on its own schedule, so a brand-new lot may not appear on the map for a while. Check the recorder's recent plats if a parcel looks missing.
- Parcel numbers change after splits. A tract that was one parcel last year can be several today. Search by owner name or address as well as by an old parcel number.
- City limits move. Growing cities annex land, which changes who handles zoning and permits even though the county still keeps the deed and the tax map.
- Percent is not the same as people. A small county can post a big percentage on a modest number of new residents, so read the people-added column too.
Related guides
- Largest counties in New York
- New York county GIS websites by viewer
- New York plat maps
- New York statewide parcel map
- New York landowner maps for hunting
- Fastest growing counties in the US
- US counties losing population
More: All New York counties on Platbookmapper
Sources
- U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2025 (April 1, 2020 estimates base and July 1, 2020–2025 estimates, with components of change). Percent change is from the April 1, 2020 estimates base to the July 1, 2025 estimate.
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 24, 2026) for each official parcel viewer.