Duplex (2 Units, Any Combination)Residential
21 DUFFY CT
NORTHPORT, NY 11768
0
Baths
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
Tax & Assessment
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$30,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$6,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$23,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$429,577
Property Facts
Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.16
PoolWhether the property has a pool, and what kind, such as in-ground.No
Transaction History(1)
Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.
EMH
Francis J O'Neill SchoolC-
Elementary · Grades KG–6 · 0.1 mi
Ralph Reed SchoolD
Middle · Grades 7–8 · 0.7 mi
Central Islip Senior High SchoolC-
High · Grades 9–12 · 0.8 mi
District: Central Islip Union Free School District
Neighborhood · ZIP 11768These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.
CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.59
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.107
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.86
Index scale: 100 = US average (tick). Lower is better.
Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.21,320
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.805 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$163,629
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$198,539
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%
Owner Tools
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Claim this homeData by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.
How this home compares
21 Duffy Ct measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.
- Has a smaller lot than 87% of homes in Northport 11768
How it measures up in Northport 11768
The dot is this home. The mark in the middle is the typical home in Northport 11768.
Lot size0.16 ac
SmallerTypical 0.46 acBigger
Bigger than 13% of homes nearby
| Measure | This home | Northport 11768 | Suffolk County |
|---|---|---|---|
| Lot sizebigger than | 0.16 ac | 13% of homes | 17% of homes |
More homes on Duffy Ct
Closest homes
- 45 2nd Ave$454K99 ft · 0.13 ac · Sold $92K · Sep 1998
- 43 2nd Ave$520K98 ft · 0.13 ac · Sold $183K · Mar 2011
- 41 2nd Ave$459K96 ft · 0.21 ac · Sold $160K · Feb 2013
- 29 Duffy Ct$643K130 ft · 1,656 ft² · Sold $451K · Dec 2021
- 36 3rd Ave$530K147 ft · 0.39 ac · Sold $265K · Sep 2017
- 37 2nd Ave$598K139 ft · 0.21 ac · Sold $520K · Jun 2024
- 34 3rd Ave$465K194 ft · 0.26 ac · Sold $258K · Mar 2017
- 22 Duffy Ct$435K168 ft · 0.16 ac · Sold $87K · Sep 2012
More homes in Northport 11768
- 2 Heiko Ct$1.1M0.13 ac · Sold $1.1M · Sep 2026
- 18 Harborview Dr6 bd · 4,393 ft² · Sold $6.8M · Sep 2026
- 7 Orient Ave$1.7M0.83 ac · Sold $1.6M · Sep 2026
- 10 Old Route 25a$892K4 bd · 2.5 ba · 1,976 ft² · Sold $1.1M · Sep 2026
- 39 Bevin Rd$1.7M1 ac · Sold $1.6M · Sep 2026
- 42 Winkle Point Dr$2.2M2.16 ac · Sold $2.2M · Aug 2026
- 21 Timberbrook Rd4 bd · 3 ba · 2,931 ft² · Sold $1.7M · Aug 2026
- 51 Sunken Meadow Rd$863K3 bd · 2 ba · 1,988 ft² · Sold $855K · Aug 2026
- 69 Dogwood Rd$850K0.16 ac · Sold $725K · Aug 2026
- 16 Makamah Beach Rd$1.6M0.18 ac · Sold $1.6M · Aug 2026
- 112 Locust Ln$1.7M2.21 ac · Sold $1.3M · Aug 2026
- 95 Scudder Pl$931K0.12 ac · Sold $937K · Aug 2026
Assigned schools
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