"An unofficial delineation of neighborhood boundaries used by the City Clerks Office"; per https://data.seattle.gov/dataset/Neighborhoods/2mbt-aqqx/data?pane=manage

seattle-neighborhoods.txt

Uncategorized:
  Bitter Lake
  Broadview
  Bryant
  Crown Hill
  Fremont
  Georgetown
  Green Lake
  Greenwood
  Harbor Island
  Industrial District
  Industrial District
  Laurelhurst
  North Beach/Blue Ridge
  Phinney Ridge
  Ravenna
  Roosevelt
  Sand Point
  South Park
  View Ridge
  Wallingford
  Wedgwood
  Windermere

Ballard:
  Adams
  Loyal Heights
  Sunset Hill
  West Woodland
  Whittier Heights

Beacon Hill:
  Holly Park
  Mid-Beacon Hill
  North Beacon Hill
  South Beacon Hill

Capitol Hill:
  Broadway
  Madison Park
  Montlake
  Portage Bay
  Stevens

Cascade:
  Eastlake
  South Lake Union
  Westlake

Central Area:
  Atlantic
  Harrison/Denny-Blaine
  Leschi
  Madrona
  Mann
  Minor

Delridge:
  High Point
  Highland Park
  North Delridge
  Riverview
  Roxhill
  South Delridge

Downtown:
  Belltown
  Central Business District
  First Hill
  International District
  Pike-Market
  Pioneer Square
  Yesler Terrace

Interbay:
  Interbay

Lake City:
  Cedar Park
  Matthews Beach
  Meadowbrook
  Olympic Hills
  Victory Heights

Magnolia:
  Briarcliff
  Lawton Park
  Southeast Magnolia

Northgate:
  Haller Lake
  Maple Leaf
  North College Park
  Pinehurst

Queen Anne:
  East Queen Anne
  Lower Queen Anne
  North Queen Anne
  West Queen Anne

Rainier Valley:
  Brighton
  Columbia City
  Dunlap
  Mount Baker
  Rainier Beach
  Rainier View

Seward Park:
  Seward Park

University District:
  University District

West Seattle:
  Alki
  Arbor Heights
  Fairmount Park
  Fauntleroy
  Gatewood
  Genesee
  North Admiral
  Seaview