Union County Ohio - Government Site
Population: 46,702
Area: 437 square miles
County Seat: Marysville
Area Code(s) in use: 937 740
Time Zone: EST
Adjacent counties:
Champaign Delaware Franklin Hardin Logan Madison Marion
Airport
Bayes Airport, Darby Airport, J-EM Farm Airport, Mitchell Airport, Schrader Airstrip, Union County Airport
Bridge
Little Darby Bridge, Reed Bridge, Spain Creek Bridge, Treacle Creek Bridge, Upper Darby Bridge
Building
Allen Township Hall, Darby Township Hall, Dover Township Hall, Jerome Township Hall, Leesburg Township Hall, Magnetic Springs Village Hall, Marysville City Hall, Marysville Public Library, Milford Center Village Hall, Mill Creek Township Hall, Ohio Reformatory for Women, Paris Township Hall, Richwood City Hall, Richwood North Union Public Library, Union County Childrens Home, Union County Courthouse, Union County Home, Union Township Hall, Unionville Center Village Hall, Washington Township Hall
Canal
Gordon Tri-County Ditch, Infirmary Ditch, Kile Ditch
Cemetery
Amerine Cemetery, Asbury Cemetery, Baughn Cemetery, Blues Creek Cemetery, Bouic Cemetery, Broadway Cemetery, Broderick Cemetery, Buck Run Cemetery, Burnside Cemetery, Buxton Cemetery, Byhalia Cemetery, Chenney Cemetery, Claiborne Cemetery, Clark Cemetery, Connor Cemetery, East York Cemetery, Ford Cemetery, Hamilton Cemetery, Hamilton Cemetery, Hopewell Cemetery, Jerome Township Number 1 Cemetery, Jerome Township Number 2 Cemetery, Maple Dell Cemetery, Maskill Cemetery, McDonald Cemetery, Milford Center Cemetery, Mount Herman Cemetery, Mount Zion Cemetery, New California Cemetery, New Darby Cemetery, New Mill Creek Cemetery, Oakdale Cemetery, Old Darby Cemetery, Price Cemetery, Quaker Cemetery, Raymond Cemetery, Robinson Cemetery, Saint Johns Cemetery, Saint Johns Cemetery, Scott Cemetery, Sommersville Cemetery, Southard Cemetery, Stony Point Cemetery, Trinity Cemetery, Watkins Cemetery, Woods Cemetery, York Center Cemetery
Church
Allen Chapel African Methodist Episcopal Church, Bethel Church, Bethlehem Church, Calvary Church, Central United Methodist Church, Church of Christ, Darby Church, Essex United Methodist Church, Evangelical Friends Church, First Baptist Church, First Congregational Church, First English Evangelical Lutheran Church, First Presbyterian Church, First United Methodist Church, First United Methodist Church, Glad Tidings Assembly of God Church, Grace Chapel, Jerome United Methodist Church, Magnetic Springs United Methodist Church, Our Lady of Lourdes Catholic Church, Our Lady of Lourdes Roman Catholic Church, Plain City United Methodist Church, Saint Johns Church, Springdale Church, Trinity Lutheran Church, Union Baptist Church
Civil
Township of Allen, Township of Claibourne, Township of Darby, Township of Dover, Township of Jackson, Township of Jerome, Township of Leesburg, Township of Liberty, Township of Millcreek, Township of Paris, Township of Taylor, Township of Union, Township of Washington, Township of York, Union County
Dam
Liggett Lake Dam
Hospital
Memorial Hospital of Union County
Lake
Richwood Lake
Locale
Blues Creek Golf Course, Camp Union, Cotton Slash (historical), Five Points Shopping Center, Flagstone Golf Course, Marysville Country Club, Marysville Plaza Shopping Center, Marysville Square Industrial/Commercial Park, Mid Ohio Industrial Park, Rolling Meadows Golf Course, Stocksdale Shopping Center, Timberview Golf Club, Union County Fairgrounds
Park
Airport Park, Barr Haven Park, Cardinal Market Park, Eljer Park, Jerome Township Park, Marysville Historic District, McCarthy Park, Memorial Park, Milford Center Prairie State Nature Preserve, Ray Lewis Park, Richwood Fairgrounds, Richwood Lake Park, Schwartzkopf Park, Scott Circle Park, Union County Sports Complex
Populated Place
Allen Center, Arbela, Arnold, Bridgeport, Broadway, Buck Run (historical), Byhalia, Chuckery, Claiborne, Coberlys (historical), Darby Creek (historical), Dipple, Essex, Fleetwood Park, Haynesville (historical), Hillcrest Mobile Home Park, Homer (historical), Irwin, Jerome, Kokosing (historical), Lunda, Magnetic Springs, Marysville, Milford Center, Millcreek Meadows, New California, New Dover, North Liberty (historical), Otter, Peoria, Pharisburg, Pleasant Ridge, Pottersburg, Raymond, Richwood, Robinsons (historical), Summersville, Taylor Centre (historical), Unionville Center, Watkins, West Jackson, Westford (historical), Wilkins (historical), Williams (historical), Woodland, Woodview Park, York Center
Post Office
Allen Centre Post Office (historical), Arbela Post Office, Arnold Post Office (historical), Beach Grove Post Office (historical), Beach Grove Post Office (historical), Bokes Creek Post Office (historical), Broadway Post Office, Buck Run Post Office (historical), Byhalia Post Office (historical), Chuckery Post Office (historical), Claiborne Post Office (historical), Coberly's Post Office (historical), Darby Plains Post Office (historical), Irwin Post Office, Jerome Post Office (historical), Lunda Post Office (historical), Magnetic Springs Post Office, Marysville Post Office, Milford Center Post Office, New California Post Office (historical), New Dover Post Office (historical), Peoria Post Office (historical), Pharisburg Post Office (historical), Pottersburg Post Office (historical), Raymond Post Office, Richwood Post Office, Rushcreek Post Office (historical), Taylor Centre Post Office (historical), Unionville Center Post Office, Watkins Post Office (historical)
Reservoir
Heart of Ohio Fish and Game Association Reservoir, Liggett Lake, Twin Lakes
School
Adams School (historical), Amarine School (historical), Asbury School (historical), Baldwin School (historical), Beechdale School (historical), Benedict School (historical), Bethany School (historical), Bethel School (historical), Big Swale School (historical), Bigelow School (historical), Blackhawk School (historical), Blue School (historical), Blues Creek School (historical), Bokes Creek School (historical), Bolenbaugh School (historical), Bonnette School (historical), Boundary School (historical), Braum School (historical), Cahill School (historical), Cahill School (historical), Carter School (historical), Carter School (historical), Chaney School (historical), Claibourne-Richwood Elementary School, Deadwood School (historical), Dover School, East Elementary School, Edgewood Elementary School, Elliot School (historical), Fairbanks High School, Flat Branch School (historical), Fountain Grove School (historical), Fouts School (historical), Grace Temple School (historical), Henpeck School (historical), Hildreth School (historical), Howard School (historical), Hull School (historical), Jackson Elementary School, Lee School (historical), Leesburg-Magnetic Elementary School, Marysville High School, Marysville Middle School, McFadden School (historical), Merit School (historical), Middleton School (historical), Miller School (historical), Miller School (historical), Mount Hermon School (historical), North Union High School, North Western High School, Perkins School (historical), Phelps School (historical), Pleasant Valley School (historical), Raymond Elementary School, Ryan School, Saint Johns School, Saint Pauls School, Sherwood School (historical), Shirk School (historical), Shirk School (historical), Springdale School (historical), Stahl School (historical), Stony Point School (historical), Stub School (historical), Styre School (historical), Sunnyside School (historical), Tanner Crossing School (historical), Tawa School (historical), Taylor School (historical), Tenery School (historical), Thompson School (historical), Trinity School, West Blues Creek School (historical), Wilderness School (historical), Willey School (historical), Wolf School (historical)
Spring
Fairbanks Spring
Stream
Bear Swamp Run, Big Run, Big Swale Creek, Brush Run, Buck Run, Colver Run, Cow Run, Crosses Run, Elliot Run, Eversole Run, Flat Branch, Grassy Run, Hay Run, Howard Run, Little Otter Run, Middle Branch Bokes Creek, Opossum Run, Otter Run, Peacock Run, Phelps Run, Powder Lick Run, Prairie Run, Proctor Run, Robinson Run, Rocky Fork, Sager Run, Tombstone Creek, Town Run, Treacle Creek, Watson Run
Swamp
Bear Swamp (historical), Crane Swamp
Tower
WNRJ-FM (Marysville), WUCO-AM (Marysville)
Valley
Big Swale
| Race | Population |
| White |  44,079 |
| Black | 1,450 |
| Asian | 604 |
| Mixed | 479 |
| American Indian | 83 |
| Hawaiian & Pacific Islander | 7 |
| Additional population tables : | |
| State population table | |
| Ohio population by county | |