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County · code 23005

Cumberland CountyMaine

Cumberland County is a county in Maine with its seat in Portland, formed in 1760.

  • Founded1760
  • County seatPortland
  • Named forPrince William, Duke of Cumberland
  • Land area836 sq mi + 381 sq mi water
  • Population303,069 2020 Census
  • Parcels mapped144,348 checked 15 October 2026
Open the free map Click any parcel in Cumberland County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

AndroscogginSagadahocYorkOxford Portland Census outline · seat marked

Where it is

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

History

Formed in 1760 from York County

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

Cumberland County was created by Massachusetts from York County in 1760 and named after Prince William, Duke of Cumberland. When Maine was separated from Massachusetts and admitted to the Union in 1820, Cumberland became a county in the state of Maine. Over the following decades, the county experienced several small boundary adjustments with neighboring counties York, Oxford, and Kennebec.

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

  1. 1760
    Cumberland County created Cumberland created by Massachusetts from York.
    from York
    · Mass. Col. Acts, vol. 4, ch. 7 [1760-1761], secs. 1, 2, 6/pp. 372-374
  2. 1763
    Cumberland County created Cumberland was extended northward to the Atlantic watershed when King George Iii created the new royal province of Quebec, which was bounded on the south by the watershed between the St. Lawrence River and the Atlantic Ocean. This implicitly set the northern limit of Maine.
    from Iii
    · Cappon, Petchenik, and Long, 1, 77; Shortt and Doughty, 119-120
  3. 1786
    Gained territory Cumberland gained from York.
    from York
    · Mass. Acts 1786, ch. 18, sec. 1/p. 407
  4. 1805
    Gained territory Cumberland gained from York, lost to Kennebec, and lost to creation of Oxford.
    from Yorkfrom Kennebecfrom Oxford
    · Mass. Acts 1805, ch. 24, secs. 1-2/pp. 573-574
  5. 1820
    Became part of Maine Cumberland became a county in the state of Maine when Maine was separated from Massachusetts and admitted to the Union. · U.S. Stat., vol. 3, ch. 19 [1820]/p. 544
Show all 23 changes (18 more, mostly small adjustments)
  1. 1760
    Cumberland County created Cumberland created by Massachusetts from York.
    from York
    · Mass. Col. Acts, vol. 4, ch. 7 [1760-1761], secs. 1, 2, 6/pp. 372-374
  2. 1763
    Cumberland County created Cumberland was extended northward to the Atlantic watershed when King George Iii created the new royal province of Quebec, which was bounded on the south by the watershed between the St. Lawrence River and the Atlantic Ocean. This implicitly set the northern limit of Maine.
    from Iii
    · Cappon, Petchenik, and Long, 1, 77; Shortt and Doughty, 119-120
  3. 1786
    Gained territory Cumberland gained from York.
    from York
    · Mass. Acts 1786, ch. 18, sec. 1/p. 407
  4. 1805
    Gained territory Cumberland gained from York, lost to Kennebec, and lost to creation of Oxford.
    from Yorkfrom Kennebecfrom Oxford
    · Mass. Acts 1805, ch. 24, secs. 1-2/pp. 573-574
  5. 1820
    Became part of Maine Cumberland became a county in the state of Maine when Maine was separated from Massachusetts and admitted to the Union. · U.S. Stat., vol. 3, ch. 19 [1820]/p. 544
  6. 1821
    Boundary clarified Boundary between Cumberland and Oxford was clarified (no change).
    with Oxfordno change
    · Me. Priv. Acts 1821, ch. 26/p. 28
  7. 1821
    Lost territory Cumberland lost to Oxford.
    to Oxford
    · Me. Priv. Acts 1821, ch. 47/p. 45
  8. 1824
    Gained territory Cumberland gained small area from York.
    from York
    · Me. Priv. Acts 1824, ch. 276/p. 397
  9. 1830
    Gained territory Cumberland gained small area from Oxford when town of Sebago gained from town of Denmark.
    from Oxford
    · Me. Priv. Acts 1830, ch. 94/p. 159
  10. 1830
    Lost territory Cumberland lost small area to Oxford when town of Oxford gained from town of Otisfield.
    to Oxford
    · Me. Priv. Acts 1830, ch. 115/p. 194
  11. 1841
    Lost territory Cumberland lost small area to York when town of Saco gained from town of Scarborough.
    to York
    · Me. Laws 1841, ch. 136, sec. 1/p. 330
  12. 1842
    Gained territory Cumberland gained small area from Oxford when town of Bridgton gained from town of Denmark.
    from Oxford
    · Me. Laws 1842, Priv., ch. 16/p. 15
  13. 1844
    Lost territory Cumberland lost small area to Oxford when town of Hiram gained from town of Baldwin.
    to Oxford
    · Me. Laws 1844, Priv., ch. 156/p. 194
  14. 1847
    Gained territory Cumberland gained from Oxford when town of Bridgton gained from towns of Fryeburg and Denmark.
    from Oxford
    · Me. Laws 1847, Priv., ch. 84, sec. 1/pp. 110-111
  15. 1854
    Lost territory Cumberland lost to creation of Androscoggin.
    to Androscoggin
    · Me. Laws 1854, Pub., ch. 60, sec. 1/p. 74
  16. 1858
    Gained territory Cumberland gained small area from Androscoggin when towns of Casco and Otisfield gained from town of Poland.
    from Androscoggin
    · Me. Laws 1858, Priv., ch. 220/p. 185 and ch. 222/p. 187
  17. 1891
    Gained territory Cumberland gained Ragged Island in Casco Bay from Sagadahoc.
    from Sagadahoc
    · Me. Laws 1891, Priv., ch. 25/p. 25
  18. 1903
    Boundary clarified Boundary between Cumberland and Sagadahoc was redefined (no change).
    with Sagadahocno change
    · Me. Laws 1903, Priv., ch. 415/p. 628
  19. 1905
    Boundary clarified Boundary between Cumberland and Sagadahoc was redefined (no change).
    with Sagadahocno change
    · Me. Laws 1905, Priv., ch. 200/p. 231
  20. 1917
    Boundary clarified Boundary between Cumberland and Sagadahoc was redefined (no change).
    with Sagadahocno change
    · Me. Laws 1917, Priv., ch. 68/p. 501
  21. 1978
    Lost territory Cumberland lost to Oxford when the town of Otisfield was annexed to Oxford.
    to Oxford
    · Me. Laws 1977, priv. & spec., chs. 10, 83/pp. 1349-1351, 1475
  22. 1985
    Changed Legislature authorized Sagadahoc to gain the towns of Brunswick and Harpswell from Cumberland, dependent on local referendum to be held during the 1986 general election. Change did not take effect.
    Sagadahoc
    · Me. Laws 1985, 1st reg. sess., priv. & spec., ch. 37/pp. 2076-2078
  23. 1999
    Boundary clarified Boundary between Cumberland and Androscoggin was clarified when the boundary between the towns of Pownal and Durham was clarified (no change).
    with Androscogginno change
    · Me. Laws 1999, 1st reg. sess., priv. & spec., ch. 9/pp. 964-965

Land and parcels

What the maps cover in Cumberland

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

Cumberland by the Census

Population
303,069 2020 Census count
Housing units
149,452 2020 Census count
Land area
836 square miles
Water area
381 square miles · 31% of the county, including large bodies of water
People per sq mi
362 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

Cumberland County's official site

We have found the county's site but not its offices yet; start there.

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.

County government

See your own lot on these maps

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Questions

Common questions about Cumberland County

When was Cumberland County founded?
Cumberland County was founded in 1760, formed from York County, and named after Prince William, Duke of Cumberland.
What is the county seat of Cumberland County?
The county seat of Cumberland County is Portland.
Is there an online parcel map for Cumberland County?
Yes. A public source publishes a parcel map of 144,348 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Cumberland County's boundary or name changed?
Cumberland County was created in 1760 from York County. Since then the Atlas of Historical County Boundaries records 17 later changes, chiefly involving Oxford County, York County and Androscoggin County.
Is my lot in a flood zone?
We do not have flood maps for Cumberland 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