📊 Data: NCES CCD 2024–2025·🔄 Updated: August 2026·Editorial standards
📍 Hadlyme, CT · Lower Connecticut River Valley Planning Region

Regional School District 18

Grades Pre-K – 12th · 1,288 students · 5 schools · 3 zip codes

10
out of 10 Rating Excellent
State reading & math proficiency · 94th percentile among Connecticut districts. Ranked within Connecticut only — not comparable across states.
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School District · Connecticut
Regional School District 18
📍 Hadlyme, CT · Lower Connecticut River Valley Planning Region · NCES LEAID 0903540
10/10
Rating
1,288
Students
5
Schools
Pre-K – 12th
Grade Span
3
Zip Codes

District Contact & Information

Source: NCES CCD 2024–25
📚
Grades Served
Pre-K – 12th
📞
District Phone
🌐
District Website
📍
District Mailing Address
49 Lyme Street, Old Lyme, CT 06371
🎓
Enrollment
1,288 students
🏫
Schools
5
🏷
NCES District ID (LEAID)
0903540
🏛
District Type
Public School District

Schools in Regional School District 18

5 schools listed
SchoolLevelGradesStudentsCity
Center SchoolElementaryPre-K80Old Lyme
Lyme Consolidated SchoolElementaryKindergarten – 5th226Lyme
Mile Creek SchoolElementaryKindergarten – 5th334Old Lyme
Lyme-Old Lyme Middle SchoolMiddle6th – 8th271Old Lyme
Lyme-Old Lyme High SchoolHigh9th – 12th367Old Lyme

Zip Codes Served by Regional School District 18

3 zip codes
Zip CodeCityCountyState
06371Old LymeLower Connecticut River Valley Planning RegionCT
06376South LymeLower Connecticut River Valley Planning RegionCT
06439HadlymeLower Connecticut River Valley Planning RegionCT

Frequently Asked Questions

What zip codes are in Regional School District 18?
Regional School District 18 serves 3 zip codes: 06371, 06376, 06439. Zip codes and district boundaries do not line up exactly, so confirm your exact address with the district office before you rely on an assignment.
How is Regional School District 18 rated?
Regional School District 18 has an overall rating of 10 out of 10 (Excellent), based on the share of students proficient in reading and math on state assessments (NCES EDFacts). That places it in the 94th percentile among Connecticut school districts. Ratings are percentile-ranked within Connecticut only and are not comparable across states.
How many students attend Regional School District 18?
The NCES Common Core of Data directory reports enrollment of 1,288 students across 5 schools for Regional School District 18.
What grades does Regional School District 18 serve?
Regional School District 18 is listed in the NCES directory as serving grades Pre-K – 12th.
What schools are in Regional School District 18?
NCES lists 5 schools operating under Regional School District 18: 3 elementary, 1 middle, 1 high. Each school's grade span, enrollment and city are listed on this page. Attendance zones are set by the district and a school on this list is not necessarily the one your address is assigned to.
How do I contact Regional School District 18?
You can reach Regional School District 18 by phone at (860)434-7238 or online at www.region18.org or by mail at 49 Lyme Street, Old Lyme, CT 06371. Contact details come from the NCES district directory and are the best way to confirm which school your address is assigned to.

About Regional School District 18

Regional School District 18 is a public school district serving 3 zip codes in Connecticut, primarily in Lower Connecticut River Valley Planning Region. It carries an overall rating of 10/10 (Excellent), the 94th percentile among Connecticut districts. That rating reflects the share of students proficient in reading and math on state assessments (NCES EDFacts, 2021–22 for most districts with a 2017–18 fallback for the rest) and is ranked only against other Connecticut districts — scores are not comparable between states. Directory details on this page come from the NCES Common Core of Data, 2024–25.

Schools in this district

NCES lists 5 schools operating under Regional School District 18 — 3 elementary, 1 middle and 1 high. The largest by enrollment is Lyme-Old Lyme High School with 367 students. School-level enrollment comes from the NCES Common Core of Data school directory; a school with no reported enrollment is shown with a dash rather than a zero.

Checking your own address

District boundaries are address-specific and do not follow zip code lines exactly — a single zip code can be split between two or more districts. Use the zip codes listed above as a starting point, then confirm your assignment with the district office at (860)434-7238 before making a housing decision.