When was Knox County founded?

Knox County was founded in 1860, formed from Lincoln County and Waldo County, and named after Henry Knox.

What is the county seat of Knox County?

The county seat of Knox County is Rockland.

Is there an online parcel map for Knox County?

Yes. Maine GeoLibrary (Maine Office of GIS) publishes a parcel map of 29,268 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Knox County's boundary or name changed?

Knox County was created in 1860 from Lincoln County and Waldo County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Hancock County.

Is my lot in a flood zone?

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

County · code 23013

Knox CountyMaine

Knox County is a county in Maine with its seat in Rockland, formed in 1860.

Founded1860
County seatRockland
Named forHenry Knox
Land area365 sq mi + 779 sq mi water
Population40,607 2020 Census
Parcels mapped29,268 checked 16 October 2026

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

Updated 19 October 2026

Census outline · seat marked

Where it is

Knox on the map of Maine

Maine has 16 counties and county equivalents, each with its own records office. Shapes with a page are links.

Counties of Maine · Knox highlighted

History

Formed in 1860 from Lincoln County and Waldo County

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

Knox County was created on April 1, 1860, from parts of Lincoln and Waldo counties. The county was named after Henry Knox. In 1913, Knox gained Isle au Haut from Hancock County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

1860
Knox County created Knox created from Lincoln and Waldo.
from Lincoln from Waldo
1 April 1860 · Me. Laws 1860, Pub., ch. 146, sec. 1/p. 129
1913
Gained territory Knox gained Isle au Haut from Hancock.
from Hancock
12 March 1913 · Me. Laws 1913, Priv., ch. 83/p. 425

Land and parcels

What the maps cover in Knox

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

Parcels Good enough

Lot lines and tax-map numbers for 29,268 parcels from Maine GeoLibrary (Maine Office of GIS). Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 17 August 2026 · checked 16 October 2026
Address points Missing

No public address points layer found for Knox 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

Knox by the Census

Population

40,607 2020 Census count

Housing units

24,255 2020 Census count

Land area

365 square miles

Water area

779 square miles · 68% of the county, including large bodies of water

People per sq mi

111 population ÷ land area

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

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

In Maine, permits, zoning and assessing are handled by each city or town, not the county, and deeds are recorded at the county's registry of deeds.

Records

Assessor and property records
Tax Abatements
from knoxcountymaine.gov · checked 13 October 2026
Clerk of court: deeds and plats
Contact Us
from knoxcountymaine.gov · checked 13 October 2026

Zoning and code

Planning and zoning
Knox County Local Emergency Planning Committee (LEPC)
from knoxcountymaine.gov · checked 13 October 2026

County government

County government
The official website of Knox County.
knoxcountymaine.gov

See your own lot on these maps

Open Knox 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 Knox County

When was Knox County founded?: Knox County was founded in 1860, formed from Lincoln County and Waldo County, and named after Henry Knox.
What is the county seat of Knox County?: The county seat of Knox County is Rockland.
Is there an online parcel map for Knox County?: Yes. Maine GeoLibrary (Maine Office of GIS) publishes a parcel map of 29,268 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Knox County's boundary or name changed?: Knox County was created in 1860 from Lincoln County and Waldo County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Hancock County.
Is my lot in a flood zone?: We do not have flood maps for Knox County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby