When was Linn County founded?

Linn County was founded in 1847, formed from Champoeg County and Marion County, and named after Lewis F. Linn.

What is the county seat of Linn County?

The county seat of Linn County is Albany.

Is there an online parcel map for Linn County?

Yes. Linn County publishes a parcel map of 54,598 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Linn County's boundary or name changed?

Linn County was created in 1847 from Champoeg County and Marion County. Since then the Atlas of Historical County Boundaries records 9 later changes, chiefly involving Lane County, Lane (Ore.) County and Marion County.

Is my lot in a flood zone?

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

County · code 41043

Linn CountyOregon

Linn County is a county in Oregon, with its seat in Albany. It was created on December 28, 1847, and named after Lewis F. Linn.

Founded1847
County seatAlbany
Named forLewis F. Linn
Land area2,289 sq mi + 19 sq mi water
Population128,610 2020 Census
Parcels mapped54,598 checked 15 October 2026

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

Updated 20 October 2026

Census outline · seat marked

History

Formed in 1847 from Champoeg County and Marion County

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

Linn County was created by the Oregon Territory Provisional Legislature from Champoeg County, which later became Marion County. The county's boundaries changed several times as new counties were created: Lane County was formed from its southern territory in 1851, Wasco County in 1854, and Lane County gained additional territory in 1887. Linn became an Oregon county when Oregon was admitted to the Union in 1859.

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

1847
Linn County created Linn created by the Provisional Legislature of Oregon Territory from Champoeg (now Marion).
from Champoegfrom Marion
28 December 1847 · Ore. Terr. Laws, general and local, 1843-1849, pp. 55-56
1851
Lost territory Linn lost to creation of Non-County Area 3 when the county's southern line redefined. This change apparently made in preparation for creation of Lane on 28 January 1851.
to Lane
4 January 1851 · Ore. Terr. Laws 1850, 2nd sess., pp. 33-34
1851
Lost territory Linn (Oregon) lost to creation of Lane (Oregon); Linn still included part of present Wyoming.
to Lane (Ore.)
28 January 1851 · Ore. Terr. Laws 1850, 2d sess., loc., pp. 32-34
1854
Lost territory Linn lost to creation of Wasco.
to Wasco
11 January 1854 · Ore. Terr. Special Laws 1853, 5th reg. sess., pp. 26-27
1859
Became part of Oregon Linn became an Oregon county when the state of Oregon was admitted to the Union and Oregon Territory was eliminated. 14 February 1859 · U.S. Stat., vol. 11, ch. 33[1859], secs. 1-2/pp. 383-384 Ore. Laws 1860, 1st reg. sess., pp. 28-30

Show all 12 changes (7 more)

1847
Linn County created Linn created by the Provisional Legislature of Oregon Territory from Champoeg (now Marion).
from Champoegfrom Marion
28 December 1847 · Ore. Terr. Laws, general and local, 1843-1849, pp. 55-56
1851
Lost territory Linn lost to creation of Non-County Area 3 when the county's southern line redefined. This change apparently made in preparation for creation of Lane on 28 January 1851.
to Lane
4 January 1851 · Ore. Terr. Laws 1850, 2nd sess., pp. 33-34
1851
Lost territory Linn (Oregon) lost to creation of Lane (Oregon); Linn still included part of present Wyoming.
to Lane (Ore.)
28 January 1851 · Ore. Terr. Laws 1850, 2d sess., loc., pp. 32-34
1854
Lost territory Linn lost to creation of Wasco.
to Wasco
11 January 1854 · Ore. Terr. Special Laws 1853, 5th reg. sess., pp. 26-27
1855
Boundary clarified Linn south line redefined (no change).
no change
17 January 1855 · Ore. Terr. Special Laws 1854, 6th reg. sess., p. 34
1859
Became part of Oregon Linn became an Oregon county when the state of Oregon was admitted to the Union and Oregon Territory was eliminated. 14 February 1859 · U.S. Stat., vol. 11, ch. 33[1859], secs. 1-2/pp. 383-384 Ore. Laws 1860, 1st reg. sess., pp. 28-30
1887
Lost territory Linn lost to Lane.
to Lane
16 February 1887 · Ore. Laws 1887, gen., 14th reg. sess., p. 126
1907
Exchanged territory Linn exchanged with Lane.
with Lane
29 January 1907 · Ore. Laws 1907, gen., 24th reg. sess., ch. 3/pp. 12-14
1907
Lost territory Linn lost to Lane.
to Lane
19 February 1907 · Ore. Laws 1907, gen., 24th reg. sess., ch. 63/pp. 114-115
1913
Gained territory Linn gained from Marion.
from Marion
25 February 1913 · Ore. Laws 1913, gen., 27th reg. sess., ch. 109/p. 184
1915
Lost territory Linn lost to Lane. Area annexed from Linn was approximately 120 acres along the Willamette River near the present town of Lancaster.
to Lane
12 February 1915 · Ore. Laws 1915, gen., 28th reg. sess., ch. 65/pp. 76-77
1985
Boundary clarified Linn boundary with Marion redefined to run along the middle of the main channel of the Santiam River, and along the middle of the main channel of the north fork of the Santiam River as they existed on 21 April 1982 (no change).
with Marionno change
23 May 1985 · Ore. Laws 1985, 63rd reg. sess., ch. 122/p. 407

Land and parcels

What the maps cover in Linn

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

Parcels Good enough

Lot lines and tax-map numbers for 54,598 parcels from Linn County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 15 October 2026
Address points Official

One point per address, 57,532 in all from State of Oregon — Department of Administrative Services Geospatial Enterprise Office (GEOHub) with Oregon Department of Emergency Management 9-1-1 program.
edited 16 January 2026 · checked 13 October 2026
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

Linn by the Census

Population

128,610 2020 Census count

Housing units

51,921 2020 Census count

Land area

2,289 square miles

Water area

19 square miles

People per sq mi

56 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

Linn County's official site

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

County government

County government
The official website of Linn County.
co.linn.or.us

See your own lot on these maps

Open Linn 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 Linn County

When was Linn County founded?: Linn County was founded in 1847, formed from Champoeg County and Marion County, and named after Lewis F. Linn.
What is the county seat of Linn County?: The county seat of Linn County is Albany.
Is there an online parcel map for Linn County?: Yes. Linn County publishes a parcel map of 54,598 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Linn County's boundary or name changed?: Linn County was created in 1847 from Champoeg County and Marion County. Since then the Atlas of Historical County Boundaries records 9 later changes, chiefly involving Lane County, Lane (Ore.) County and Marion County.
Is my lot in a flood zone?: We do not have flood maps for Linn County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby