When was Tolland County founded?

Tolland County was founded in 1785, formed from Hartford County and Windham County, and named after Tolland, England.

Is there an online parcel map for Tolland County?

Yes. A public source publishes a parcel map of 58,835 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Tolland County's boundary or name changed?

Tolland County was created in 1785 from Hartford County and Windham County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Windham County, Hartford County and Hampden (Mass.) County.

Is my lot in a flood zone?

We do not have flood maps for Tolland County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

County · code 09013

Tolland CountyConnecticut

Tolland County is a county in Connecticut, formed in 1785 from Hartford and Windham counties.

Founded1785
Named forTolland, England
Land area410 sq mi + 6.8 sq mi water
Population149,788 2020 Census
Parcels mapped58,835 checked 15 October 2026

Open the free map Click any parcel in Tolland County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated 19 October 2026

Census outline

Where it is

Tolland on the map of Connecticut

Connecticut has 8 counties and county equivalents, each with its own records office. Shapes with a page are links.

Counties of Connecticut · Tolland highlighted

History

Formed in 1785 from Hartford County and Windham County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Tolland County was created on October 13, 1785, from Hartford and Windham counties. The county gained the town of Coventry from Windham in 1786 and the towns of Columbia and Mansfield from Windham in 1827. In 1803, Tolland lost to Hartford when the town of Marlborough was created from the towns of Colchester, Glastonbury, and Hebron.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

1785
Tolland County created Tolland created from Hartford and Windham.
from Hartford from Windham
13 October 1785 · Conn. St. Recs., 6:93
1786
Gained territory Tolland gained the town of Coventry from Windham.
from Windham
11 May 1786 · Conn. St. Recs., 6:154
1789
Gained territory Tolland gained from Hartford when the town of Bolton gained from town of East Windsor.
from Hartford
14 May 1789 · Conn. St. Recs., 7:62
1803
Lost territory Tolland lost to Hartford when the town of Marlborough was created from the towns of Colchester, Glastonbury, and Hebron.
to Hartford
13 October 1803 · Conn. Spec. Acts 1803, 2:1157-1158
1827
Gained territory Tolland gained the towns of Columbia and Mansfield from Windham.
from Windham
25 May 1827 · Conn. Pub. Acts 1827, ch. 20-21/pp. 157-158

Show all 8 changes (3 more, mostly small adjustments)

1785
Tolland County created Tolland created from Hartford and Windham.
from Hartford from Windham
13 October 1785 · Conn. St. Recs., 6:93
1786
Gained territory Tolland gained the town of Coventry from Windham.
from Windham
11 May 1786 · Conn. St. Recs., 6:154
1789
Gained territory Tolland gained from Hartford when the town of Bolton gained from town of East Windsor.
from Hartford
14 May 1789 · Conn. St. Recs., 7:62
1796
Boundary clarified Tolland boundaries were redefined (no change).
no change
31 October 1796 · Conn. Pub. Acts 1796, pp. 123-124
1803
Lost territory Tolland lost to Hartford when the town of Marlborough was created from the towns of Colchester, Glastonbury, and Hebron.
to Hartford
13 October 1803 · Conn. Spec. Acts 1803, 2:1157-1158
1826
Exchanged territory Tolland exchanged narrow strips with Hampden (Massachusetts) and Worcester (Massachusetts) when an irregularity in the state boundary was straightened.
with Hampden (Mass.)with Worcester (Mass.)
3 November 1826 · Bowen, Disputes, 66; Hooker, 28
1827
Gained territory Tolland gained the towns of Columbia and Mansfield from Windham.
from Windham
25 May 1827 · Conn. Pub. Acts 1827, ch. 20-21/pp. 157-158
1885
Lost territory Tolland lost to Windham when the town of Windham gained from town of Mansfield.
to Windham
7 April 1885 · Conn. Spec. Acts 1885, no. 122, sec. 1/p. 117

Land and parcels

What the maps cover in Tolland

Who publishes each layer, how good it is, and when we last checked.

Parcels Good enough

Lot lines and tax-map numbers for 58,835 parcels. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 6 October 2026 · checked 15 October 2026
Address points Missing

No public address points layer found for Tolland County yet.
Buildings Reference

Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026

Official: from the office that keeps the record
Good enough: a reliable statewide or national copy
Fallback: a guide only; check the official record
Missing: nothing public found yet

People and land

Tolland by the Census

Population

149,788 2020 Census count

Housing units

60,876 2020 Census count

Land area

410 square miles

Water area

6.8 square miles

People per sq mi

365 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

See your own lot on these maps

Open Tolland County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

Open the free map no sign-in Pro early access

Questions

Common questions about Tolland County

When was Tolland County founded?: Tolland County was founded in 1785, formed from Hartford County and Windham County, and named after Tolland, England.
Is there an online parcel map for Tolland County?: Yes. A public source publishes a parcel map of 58,835 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Tolland County's boundary or name changed?: Tolland County was created in 1785 from Hartford County and Windham County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Windham County, Hartford County and Hampden (Mass.) County.
Is my lot in a flood zone?: We do not have flood maps for Tolland County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

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