The following county government land records are available for research at the State Archives.
Baker
Assessment Rolls, 1892-1897
Benton
Assessment Rolls, 1851-1865
Inheritance Tax Rolls, 1918-1959
Tax Rolls, 1851-1863
Clackamas
Assessment and Tax Rolls, 1850-1949
Assessment and Tax Rolls Index, 1901-1949
Deed Index, 1850-1911
Deeds, 1855-1957
Homestead Grant Records, 1916-1938
Lake Oswego Plat, 1888
Land Records, 1850-1853
Land Transaction Register, 1890-1910
Land Use Petitions, 1957
Oregon California Land Grant Records, 1921-1935
Oregon City Lot Purchase Register, 1850
Plat Book, 1940
Quit Claim Deed Record, 1850-1868
San Francisco Plat, 1850
Women's Separate Property Register, 1859-1909
Clatsop
Assessment and tax rolls, 1847-1921
Deeds [quitclaim], 1849-1858
Deed Index, 1850-1870
Land Claim Records, 1848-1893
Point Adams Military Reservation Land Acquisition Records, 1905
Columbia
Assessor's Grade Book, 1912-1923
Assessment and tax rolls, 1854-1920
Deeds [with index], 1850-1870
Land Claim records, 1854-1860
Land title registers, 1909-1920
Maps, undated
Women's Separate Property Register, 1874-1904
Crook
Assessment and tax rolls, 1882-1910
Curry
Assessment rolls, 1857-1859
Women's Separate Property Register, 1885-1907
Deschutes
Assessment and Tax Rolls, 1920-1930
Grant
Assessment Rolls, 1869-1871, 1875-1898
Delinquent Tax Rolls, 1884-1887
Plat Book, 1894-1910
Harney
Assessment and Tax Rolls, 1889-1893
Assessors Plats, 1890-1896
Land Tract Index, 1882-1913
Hood River
Assessment and Tax Rolls, 1907-1936
Deeds and Indexes, 1881-1924
Jackson
Assessment and tax rolls, 1858-1885
Assessor's correspondence, 1918-1953
Land claim records, 1862-1882
Lake
Assessment and Tax Rolls, 1874-1939
Lane
Assessment and Tax Rolls, 1854-1899
Lincoln
Deed Records, 1892-1914
Land Register, 1893-1900
Land Sale Records, 1920-1927
Linn
Assessment and Tax Rolls, 1858-1892
Assessor's Certificate of Indebtedness, 1873
Delinquent Tax Rolls, 1860-1901
Real Property Records, 1891
Real Property Sales Record, 1901
Marion
Assessment Rolls, 1854-1925
Assessment and Tax Records, 1852-1943
Land Records, 1846-1855
Multnomah
Assessment and Tax Rolls, 1866-1903
Assessment and Tax Rolls Index, 1903
Deeds, 1849-1854
Deed Index [Indirect], ca. 1855-1878
Delinquent Tax Sale Records, 1903-1910
Sheriff's Deeds Record, 1897-1931
Polk
Assessment and Tax Rolls, 1850-1940
Donation Land Claim Plats, n.d.
Land Tract Register Index, n.d.
Tillamook
Assessment and Tax Rolls, 1890-1904
Umatilla
Assessment and Tax Rolls, 1862-1925
Homestead Land Claim, 1882-1902
Plats, 1890-1913
Wasco
Assessment and Tax Rolls, 1861-1935
Homestead Certificates, 1902
School Lands Sale Records, 1872-1880
Women's Separate Property Register, 1861-1893
Washington
Assessment and Tax Rolls, 1846-1903
Assessment and Tax Roll Indexes, 1910-1945
Assessor's Correspondence, 1913-1937
Assessor's Field Books, 1900-1919
Assessor's Land Abstracts, 1904-1916
Assessor's Military Lists, 1866-1900
Deeds, 1849-1878
Deed Indexes [Direct and Indirect], 1850-1882
Donation Land Claim Survey, 1910
Fairgrounds Plat, 1868
Gaston Plat, 1889
Land Claim Records, 1849-1851
Women's Separate Property Register, 1861-1893
Wheeler
Assessment Rolls, 1898-1910
Yamhill
Assessment and Tax Rolls, 1853-1939
Assessor's Correspondence, 1884-1945
Deed Index, 1881-1883
Delinquent Tax Roll, 1867-1877
Sheriff's Tax Collection Records, 1891-1902
Tax Collection Register, 1856-1874