Killingworth is a town in Middlesex County, Connecticut, home to about 6,240 people across 35 square miles. Its ZIP code is 06419.
Homes sold for a median of $281 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Killingworth. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Killingworth’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Bradley International Airport (BDL)40 miles away |
|---|---|
| Closer regional airport | Tweed New Haven Airport (HVN)18 miles away |
| Nearest city of 250,000+ | New York, NY86 miles away |
Straight-line distances from the center of Killingworth; 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.
Killingworth had 6,174 residents in the 2020 census, up 3% since 2000.
It’s the 120th largest of 169 towns in Connecticut by population.
Middlesex County grew from 41,760 residents in 1900 to 164,245 in 2020.
Middlesex County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 84°F in summer, and winter lows average 19°F. About 45 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Meriden Markham Muni Ap, CT weather station (16 miles away).
28 doctors and other health care providers list an office in Killingworth.
Nearest hospitals
Providers with an office here
| Primary care doctors | 2 |
|---|---|
| Dentists | 1 |
| Nurse practitioners and physician assistants | 3 |
| Mental health providers | 19 |
| Physical and occupational therapists | 3 |
| Pharmacies | 1 |
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 (3 nearby)
Grocery stores (2 nearby)
Pharmacies (1 nearby)
Libraries (1 nearby)
Museums
Theaters and performance venues (1 nearby)
Counts are within about 4 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 Regional School District 17. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Killingworth Elementary SchoolHigganum | Pre-K–3 | 257 | Public | 0.3 mi |
| Haddam-Killingworth Intermediate SchoolKillingworth | 4–5 | 280 | Public | 1.0 mi |
| Haddam-Killingworth Middle SchoolKillingworth | 6–8 | 423 | Public | 1.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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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.