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Where am ILOCATED

Southeastern Connecticut Planning Region, Connecticut

Southeastern Connecticut Planning Region, Connecticut, has 284,015 residents (July 2025 estimate). It uses Eastern Time and covers 598 sq mi (1,549 km²) of land. It is a county equivalent (planning region).

BridgeportStamfordNew Haven
Southeastern Connecticut Planning Region in Connecticut
Lower Connecticut River Valley Planning RegionNorwichNew LondonWillimanticConning Towers-Nautilus Park
Southeastern Connecticut Planning Region and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
284,015
Land area
598 sq mi (1,549 km²)
County seat or government
No separate county-government seat; this is a statistical county equivalent.
Time zone
Eastern TimeUTC-05:00 in January; UTC-04:00 in July
Median household income
$86,586 ± $1,937
Median home value
$323,400 ± $5,559
Median rent, with utilities
$1,365 ± $26
Homes lived in by their owners
65.1% ± 1.0 points
County type
Planning region
Metro or micro area
Norwich-New London-Willimantic, CT metro areaCentral planning region
Water area
83.6 sq mi (216 km²)
State
Connecticut
County code (FIPS)
09180
Coordinates (central point)
41.484769, -72.101666
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Southeastern Connecticut Planning Region

Time zoneLocal time and UTC offsetNext clock change
Eastern TimeAmerica/New_YorkUTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 0636037,216 people
  2. 0634029,863 people
  3. 0632027,703 people
  4. 0622619,344 people
  5. 0641516,038 people
  6. 0638515,966 people
  7. 0635115,760 people
  8. 0635512,173 people
  9. 0635711,332 people
  10. 0638210,143 people
  11. 063399,113 people
  12. 063799,017 people
All 34
  1. 063337,389 people
  2. 063707,327 people
  3. 062497,116 people
  4. 063356,307 people
  5. 063785,555 people
  6. 063595,160 people
  7. 063315,145 people
  8. 063654,807 people
  9. 064204,368 people
  10. 063753,670 people
  11. 063303,327 people
  12. 062803,110 people
  13. 063802,757 people
  14. 063342,249 people
  15. 062542,004 people
  16. 062561,704 people
  17. 06353439 people
  18. 06266222 people
  19. 06350121 people
  20. 0633644 people
  21. 0633827 people
  22. 063890 people

34 ZIP Code areas overlap Southeastern Connecticut Planning Region. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Towns in Southeastern Connecticut Planning Region, largest first

  1. Town of Norwich39,973 people
  2. Town of Groton38,130 people
  3. Town of New London27,625 people
  4. Town of Windham23,961 people
  5. Town of Waterford19,673 people
  6. Town of East Lyme18,721 people
  7. Town of Stonington18,478 people
  8. Town of Montville17,950 people
  9. Town of Colchester15,648 people
  10. Town of Ledyard15,433 people
  11. Town of Griswold11,530 people
  12. Town of Lebanon7,116 people
All 19
  1. Town of North Stonington5,160 people
  2. Town of Preston4,821 people
  3. Town of Salem4,282 people
  4. Town of Lisbon4,211 people
  5. Town of Sprague2,962 people
  6. Town of Bozrah2,293 people
  7. Town of Franklin2,004 people

People counts are American Community Survey 2020–2024 5-year estimates. All towns in Connecticut, by county

School districts in Southeastern Connecticut Planning Region, largest first

  1. Norwich School District39,973 people
  2. Groton School District38,130 people
  3. New London School District27,625 people
  4. Windham School District23,961 people
  5. Waterford School District19,673 people
  6. East Lyme School District18,721 people
  7. Stonington School District18,478 people
  8. Montville School District17,950 people
  9. Colchester School District15,648 people
  10. Ledyard School District15,433 people
  11. Griswold School District11,530 people
  12. Lebanon School District7,116 people
All 19
  1. North Stonington School District5,160 people
  2. Preston School District4,821 people
  3. Salem School District4,282 people
  4. Lisbon School District4,211 people
  5. Sprague School District2,962 people
  6. Bozrah School District2,293 people
  7. Franklin School District2,004 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Tribal areas in Southeastern Connecticut Planning Region, largest first

  1. Mohegan Reservation239 people
  2. Mashantucket Pequot Reservation and Off-Reservation Trust Land86 people
  3. Paucatuck Eastern Pequot (state) Reservation28 people
  4. Golden Hill Paugussett (state) Reservation0 people

American Indian, Alaska Native and Native Hawaiian areas as the Census Bureau maps them, with at least 2% of their area here, water included. These lines don’t decide membership, jurisdiction or land status.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Norwich, Connecticut (city)39,973 people
  2. New London, Connecticut (city)27,625 people
  3. Willimantic, Connecticut (CDP)18,096 people
  4. Groton, Connecticut (city)9,490 people
  5. Conning Towers-Nautilus Park, Connecticut (CDP)8,460 people
  6. Pawcatuck, Connecticut (CDP)5,577 people
  7. Colchester, Connecticut (CDP)4,692 people
  8. Mystic, Connecticut (CDP)4,483 people
  9. Long Hill, Southeastern Connecticut Planning Region, Connecticut (CDP)4,399 people
  10. Jewett City, Connecticut (borough)3,429 people
  11. Old Mystic, Connecticut (CDP)3,340 people
  12. Waterford, Connecticut (CDP)3,304 people
All 22
  1. Niantic, Connecticut (CDP)3,123 people
  2. Oxoboxo River, Connecticut (CDP)2,782 people
  3. Noank, Connecticut (CDP)1,859 people
  4. South Windham, Connecticut (CDP)1,281 people
  5. Baltic, Connecticut (CDP)1,157 people
  6. Gales Ferry, Connecticut (CDP)1,141 people
  7. Poquonock Bridge, Connecticut (CDP)1,105 people
  8. Stonington, Connecticut (borough)934 people
  9. Groton Long Point, Connecticut (borough)546 people
  10. Mashantucket, Connecticut (CDP)86 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Lower Connecticut River Valley Planning Region, Connecticut21 mi west
  2. Northeastern Connecticut Planning Region, Connecticut26 mi north
  3. Washington County, Rhode Island26 mi east
  4. Capitol Planning Region, Connecticut34 mi northwest
  5. Suffolk County, New York48 mi southwest

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.