Oregon Historical County Records Guide
Multnomah County Records Inventory
Land Subdivision Records
Series documents the subdividing and partitioning of land within the county. Records include survey notes, correspondence, photographs, satisfaction of agreements, maps of subdivided and partitioned land, and contracts and permits. Information includes subdivision names; lot, street, and alley dimensions; and township, range, and section numbers of land to be subdivided or partitioned.
Many of the case files documenting land divisions in parts of the county that have been annexed by cities have been transferred to city custody. The Survey and Assessor Image Locator (SAIL) GIS mapping application includes searchable images of assessor maps, aerial photographs, survey records, subdivisions, condominiums, partitions, and government corner surveys. The information dates from circa 1851 to the present.
Records at the Oregon State Archives:
Fairview Plat and Certificate, 1882 (.10 cu.ft.).
Records at the John B. Yeon Building, Multnomah County Archives:
LD [Land Division Case Files], 1955-2000 (6 cu.ft.);
Partition Plats [record copy-title varies], 1990-present (ca.3000 plats);
Plat Index [Subdivision], 1869-1937 (3 volumes);
Subdivision Plats [record copy-title varies], 1861-2009 (ca.175 cu.ft.);
Sub Division Plats, vol. 1-1219, ca.1861-1991 (12 inches of microfilm jackets);
T [Land Division Case Files], 2000-2007 (30 cu.ft.).
Records at the John B. Yeon Building, Room B12:
T [Land Use Action Case Files], 2001-2003 (18 cu.ft.).
Records at the John B. Yeon Building, Room B13:
T [Land Use Action Case Files-includes subdivision and partition case files], 2001-2007 (115 cu.ft.).
Records at the John B. Yeon Building, Room B14:
Historic Zoning and Subdivision Codes One Sided Copies, ca.1953-ca.2003 (2 cu.ft.).
Records at the John B. Yeon Building, Microfilm Cabinet Near Room B15:
Microfilm Plat Books [Subdivision-incomplete], vol. 1-1217, ca.1861-ca.1985 (10 reels of microfilm).
Records at the John B. Yeon Building, Surveyor's Archives Room B17:
Plats and Condos Index [Condominiums], ca.1967-1988 (1 binder);
Recorded Subdivision Plats [Alphabetical Register], 1971-1991 (9 binders);
[Subdivision Plats], vol. 475-1251, ca.1909-2001 (ca.60 cu.ft.).
Records at the John B. Yeon Building, West Entrance Basement Records Storage Room:
Plats [Partition], 1990-1992 (1 reel of microfilm);
Plats [Subdivision], vol. 1-1224, ca.1861-1993 (16 reels of microfilm).
Records at the John B. Yeon Annex Building, Suite 116, Land Use Planning Office:
Land Use Action Cards-includes land division actions], ca.1960-2007 (1.50 cu.ft.);
T [Land Use Action Case Files-includes subdivision and partition case files], 2008-present (ca.60 cu.ft.).
Records at the John B. Yeon Annex Building, Suite 123, Surveyor's Office:
[Map Visual Index to Surveys, Bearing Trees, Subdivisions, Partitions, and Field Books], ca.1861-present (ca.900 maps);
Partition Plats, 1990-present (4 feet of aperture cards);
[Partition Plats], 1997-present (ca.2300 plats);
[Subdivision and Condominium Plats], vol. 1251-1303, 2001-present (10 cu.ft.);
Subdivision Plats, vol. 1-1303, ca.1861-present (12 feet of aperture cards).
Records at the Multnomah Building, Suite 125:
Partition Plat Book [Register and Index], 1990-2004 (1 volume).
Records at the Multnomah Building, Suite 175, Cartography Area:
D.L.C.s & Legal Subdivisions [Donation Land Claims-Record], 1852-ca.1906 (1 volume);
Old Plats [Subdivision and Condominiums], vol. 1-1301, ca.1861-2010 (38 reels of microfilm);
Partition Plats, 1990-2010 (15 reels of microfilm);
Plat Index [Subdivision], ca.1861-2004 (2 volumes);
Plats [Subdivision-incomplete set-with assessment-related notations], ca.1861-2000 (ca. 14 cu.ft.);
Recorded Plats [Index Cards], ca.1861-ca.1990 (1 cu.ft.).
Records at the Multnomah County Central Library:
Multnomah County Subdivision Regulations, 1955 (1 volume).
Records at the City of Portland Archives & Records Center:
Land Use Review Records [documents actions related to land divisions, zone changes, conditional uses, and other subjects on former county land annexed by the City of Portland], 1965-1994 (20 cu.ft.).
Records at the Genealogical Forum of Oregon, Research Library:
Plats [Subdivision and Condominium], 1871-2000 (23 reels of microfilm).