Killingly is a town in Windham County, Connecticut, home to about 17,105 people across 48 square miles. Its ZIP codes are 06239, 06241, 06243 and 06263.
Homes sold for a median of $249 per square foot across 4 ZIP codes in the three months ending August 2026, and 2 of 4 were seller’s markets.
Mostly Killingly; also Plainfield
All in Killingly
All in Killingly
Each card is that ZIP code’s whole market, including any part outside Killingly. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Killingly’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows Killingly well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Rhode Island T. F. Green International Airport (PVD)24 miles away |
|---|---|
| Nearest city of 250,000+ | Boston, MA56 miles away |
| Nearest city of 1 million+ | New York, NY134 miles away |
Straight-line distances from the center of Killingly; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Killingly had 17,752 residents in the 2020 census, up 8% since 2000.
It’s the 69th largest of 169 towns in Connecticut by population.
Windham County grew from 46,861 residents in 1900 to 116,418 in 2020.
Windham County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 80°F in summer, and winter lows average 19°F. About 53.8 inches of rain and melted snow fall in a typical year, with about 62 inches of snow.
Source: NOAA 1991–2020 climate normals, N Foster 1 E, RI weather station (7 miles away).
285 doctors and other health care providers list an office in Killingly’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 15 |
|---|---|
| Specialist doctors | 4 |
| Dentists | 7 |
| Nurse practitioners and physician assistants | 31 |
| Mental health providers | 192 |
| Physical and occupational therapists | 28 |
| Optometrists | 5 |
| Chiropractors | 3 |
| Pharmacies | 13 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (9 nearby)
Grocery stores (6 nearby)
Pharmacies (2 nearby)
Libraries (1 nearby)
Museums (1 nearby)
Theaters and performance venues
Counts are within about 4.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Killingly School District, Connecticut Technical Education and Career System, Eastern Connecticut Regional Educational Service Center (EAS. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Killingly Central SchoolDayville | Pre-K–2 | 317 | Public | 1.4 mi |
| Killingly Memorial SchoolDanielson | 2–4 | 485 | Public | 1.4 mi |
| Killingly Intermediate SchoolDayville | 5–8 | 692 | Public | 1.9 mi |
| H. H. Ellis Technical High SchoolDanielson | 9–12 | 650 | Career and Technical | 1.4 mi |
| Killingly High SchoolDayville | 9–12 | 744 | Public | 2.1 mi |
| Quinebaug Middle CollegeDanielson | 9–12 | 144 | Public | 0.9 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| St James SchoolDanielson | Pre-K–8 | 196 | Roman Catholic | 2.1 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
Buying or selling around Killingly? Tell us what you need and when. No agents advertise here yet, so we’ll keep your request for up to 30 days and send it to local agents who join. No obligation, and you choose who to work with.
Loading map…
Shares ZIP codes with Plainfield.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.