the Regional Transportation Agency of Central Maryland and the Maryland Transit Administration. Major Highways Communities Howard County has no incorporated municipalities. Census-designated places The Census Bureau recognizes the following Census-designated places in the county: Columbia Elkridge Ellicott City (county seat) Fulton Highland Ilchester Jessup (partly in Anne Arundel County) North Laurel Savage Scaggsville Unincorporated communities Unincorporated places not listed as Census-designated places but known in the area include: Clarksville Cooksville Daniels Dayton Dorsey Glenelg Glenwood Granite Guilford Hanover (partly in Anne Arundel County) Isaacsville Lisbon Marriottsville (partly in Carroll County and Baltimore County) Simpsonville West Friendship Woodbine Woodstock See also National Register of Historic Places listings in Howard County, Maryland Maryland Historical Trust Register of Historic Places in Howard County, Maryland References External links Howard County historian Celia M. Holland papers at the University of Maryland Libraries 1838 establishments in Maryland Populated places established in 1838 Baltimore metropolitan area Maryland counties Populated places on the Underground Railroad Majority-minority counties and independent cities in Maryland