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County · code 23003

Aroostook CountyMaine

Aroostook County is a county in Maine, with its seat in Houlton. It was created in 1839 from Penobscot and Washington counties.

  • Founded1839
  • County seatHoulton
  • Land area6,671 sq mi + 156 sq mi water
  • Population67,105 2020 Census
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Updated

PiscataquisPenobscotSomersetWashington Houlton Census outline · seat marked

Where it is

Aroostook on the map of Maine

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

Androscoggin CountyCumberland CountyFranklin CountyHancock CountyKennebec CountyKnox CountyLincoln CountyOxford CountyPenobscot CountyPiscataquis CountySagadahoc CountySomerset CountyWaldo CountyWashington CountyYork CountyAroostook County Aroostook
Counties of Maine · Aroostook highlighted

History

Formed in 1839 from Penobscot County and Washington County

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

Aroostook County was created on May 1, 1839 from Penobscot and Washington counties. The Webster-Ashburton Treaty in 1842 between Great Britain and the United States settled the U.S.-Canadian boundary, fixing the northern limits of Aroostook County. Over the following decades, Aroostook gained territory from Penobscot, Somerset, and Piscataquis counties, with minor boundary adjustments continuing into the early 1900s.

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

  1. 1839
    Aroostook County created Aroostook created from Penobscot and Washington.
    from Penobscotfrom Washington
    · Me. Pub. Acts 1839, ch. 395, sec. 1/p. 562
  2. 1842
    Changed Webster-Ashburton Treaty between Great Britain and the United States settled the U.S.-Canadian boundary, fixing the northern limits of Aroostook (no change).
    U.s.
    · Van Zandt, 17-18
  3. 1843
    Gained territory Aroostook gained from Penobscot.
    from Penobscot
    · Me. Laws 1843, Priv., ch. 15/p. 51
  4. 1844
    Gained territory Aroostook gained from Somerset and exchanged with Piscataquis.
    from Somersetfrom Piscataquis
    · Me. Laws 1844, Pub., ch. 99, secs. 1-5/pp. 92-94
  5. 1885
    Lost territory Aroostook lost small area to Washington when town of Danforth gained from town of Weston.
    to Washington
    · Me. Laws 1885, Priv., ch. 499/p. 677
  6. 1889
    Gained territory Aroostook gained from Penobscot when Reed Plantation gained from Drew Plantation.
    from Penobscot
    · Me. Laws 1889, Priv., ch. 514/p. 874
  7. 1903
    Lost territory Aroostook lost to Penobscot when Drew Plantation gained from Reed Plantation.
    to Penobscot
    · Me. Laws 1903, Priv., ch. 364/p. 550

Land and parcels

What the maps cover in Aroostook

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

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

Aroostook by the Census

Population
67,105 2020 Census count
Housing units
38,303 2020 Census count
Land area
6,671 square miles
Water area
156 square miles
People per sq mi
10 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.

Zoning and code

County government

See your own lot on these maps

Open Aroostook 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.

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Questions

Common questions about Aroostook County

When was Aroostook County founded?
Aroostook County was founded in 1839, formed from Penobscot County and Washington County.
What is the county seat of Aroostook County?
The county seat of Aroostook County is Houlton.
Is there an online parcel map for Aroostook County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Aroostook County's boundary or name changed?
Aroostook County was created in 1839 from Penobscot County and Washington County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Penobscot County, Piscataquis County and Somerset County.
Is my lot in a flood zone?
We do not have flood maps for Aroostook County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door