This is a list of U.S. county name etymologies, covering the letters J to M.

J

• Jack County, Texas
• Jackson County, Alabama
• Jackson County, Arkansas
• Jackson County, Colorado
• Jackson County, Florida
• Jackson County, Georgia
• Jackson County, Illinois
• Jackson County, Indiana
• Jackson County, Iowa
• Jackson County, Kansas
• Jackson County, Kentucky
• Jackson County, Michigan
• Jackson County, Minnesota
• Jackson County, Mississippi
• Jackson County, Missouri
• Jackson County, North Carolina
• Jackson County, Ohio
• Jackson County, Oklahoma
• Jackson County, Oregon
• Jackson County, South Dakota
• Jackson County, Tennessee
• Jackson County, Texas
• Jackson County, West Virginia
• Jackson County, Wisconsin
• Jackson Parish, Louisiana
• James City County, Virginia
• Jasper County, Georgia
• Jasper County, Illinois
• Jasper County, Indiana
• Jasper County, Iowa
• Jasper County, Mississippi
• Jasper County, Missouri
• Jasper County, South Carolina
• Jasper County, Texas
• Jay County, Indiana
• Jeff Davis County, Georgia
• Jeff Davis County, Texas
• Jefferson County, Alabama
• Jefferson County, Arkansas
• Jefferson County, Colorado
• Jefferson County, Florida
• Jefferson County, Georgia
• Jefferson County, Idaho
• Jefferson County, Illinois
• Jefferson County, Indiana
• Jefferson County, Iowa
• Jefferson County, Kansas
• Jefferson County, Kentucky
• Jefferson County, Mississippi
• Jefferson County, Missouri
• Jefferson County, Montana
• Jefferson County, Nebraska
• Jefferson County, New York
• Jefferson County, Ohio
• Jefferson County, Oklahoma
• Jefferson County, Oregon
• Jefferson County, Pennsylvania
• Jefferson County, Tennessee
• Jefferson County, Texas
• Jefferson County, Washington
• Jefferson County, West Virginia
• Jefferson County, Wisconsin
• Jefferson Parish, Louisiana
• Jefferson Davis County, Mississippi
• Jefferson Davis Parish, Louisiana
• Jenkins County, Georgia
• Jennings County, Indiana
• Jerauld County, South Dakota
• Jerome County, Idaho
• Jersey County, Illinois
• Jessamine County, Kentucky
• Jewell County, Kansas
• Jim Hogg County, Texas
• Jim Wells County, Texas
• Jo Daviess County, Illinois
• Johnson County, Arkansas
• Johnson County, Georgia
• Johnson County, Illinois
• Johnson County, Indiana
• Johnson County, Iowa
• Johnson County, Kansas
• Johnson County, Kentucky
• Johnson County, Missouri
• Johnson County, Nebraska
• Johnson County, Tennessee
• Johnson County, Texas
• Johnson County, Wyoming
• Johnston County, North Carolina
• Johnston County, Oklahoma
• Jones County, Georgia
• Jones County, Iowa
• Jones County, Mississippi
• Jones County, North Carolina
• Jones County, South Dakota
• Jones County, Texas
• Josephine County, Oregon
• Juab County, Utah
• Judith Basin County, Montana
• Juneau County, Wisconsin
• Juneau City and Borough, Alaska
• Juniata County, Pennsylvania

K

• Kalamazoo County, Michigan
• Kalawao County, Hawaii
• Kalkaska County, Michigan
• Kanabec County, Minnesota
• Kanawha County, West Virginia
• Kandiyohi County, Minnesota
• Kane County, Illinois
• Kane County, Utah
• Kankakee County, Illinois
• Karnes County, Texas
• Kauai County, Hawaii
• Kaufman County, Texas
• Kay County, Oklahoma
• Kearney County, Nebraska
• Kearny County, Kansas
• Keith County, Nebraska
• Kemper County, Mississippi
• Kenai Peninsula Borough, Alaska
• Kendall County, Illinois
• Kendall County, Texas
• Kenedy County, Texas
• Kennebec County, Maine
• Kenosha County, Wisconsin
• Kent County, Delaware
• Kent County, Maryland
• Kent County, Michigan
• Kent County, Rhode Island
• Kent County, Texas
• Kenton County, Kentucky
• Keokuk County, Iowa
• Kern County, California
• Kerr County, Texas
• Kershaw County, South Carolina
• Ketchikan Gateway Borough, Alaska
• Kewaunee County, Wisconsin
• Keweenaw County, Michigan
• Keya Paha County, Nebraska
• Kidder County, North Dakota
• Kimball County, Nebraska
• Kimble County, Texas
• King County, Texas
• King County, Washington
• King George County, Virginia
• King William County, Virginia
• King and Queen County, Virginia
• Kingfisher County, Oklahoma
• Kingman County, Kansas
• Kings County, California
• Kings County, New York
• Kingsbury County, South Dakota
• Kinney County, Texas
• Kiowa County, Colorado
• Kiowa County, Kansas
• Kiowa County, Oklahoma
• Kit Carson County, Colorado
• Kitsap County, Washington
• Kittitas County, Washington
• Kittson County, Minnesota
• Klamath County, Oregon
• Kleberg County, Texas
• Klickitat County, Washington
• Knott County, Kentucky
• Knox County, Illinois
• Knox County, Indiana
• Knox County, Kentucky
• Knox County, Maine
• Knox County, Missouri
• Knox County, Nebraska
• Knox County, Ohio
• Knox County, Tennessee
• Knox County, Texas
• Kodiak Island Borough, Alaska
• Koochiching County, Minnesota
• Kootenai County, Idaho
• Kosciusko County, Indiana
• Kossuth County, Iowa

L

• La Crosse County, Wisconsin
• La Moure County, North Dakota
• La Paz County, Arizona
• La Plata County, Colorado
• La Porte County, Indiana
• La Salle County, Illinois
• La Salle County, Texas
• La Salle Parish, Louisiana
• Labette County, Kansas
• Lac qui Parle County, Minnesota
• Lackawanna County, Pennsylvania
• Laclede County, Missouri
• Lafayette County, Arkansas
• Lafayette County, Florida
• Lafayette County, Mississippi
• Lafayette County, Missouri
• Lafayette County, Wisconsin
• Lafayette Parish, Louisiana
• Lafourche Parish, Louisiana
• Lagrange County, Indiana
• Lake County, California
• Lake County, Colorado
• Lake County, Florida
• Lake County, Illinois
• Lake County, Indiana
• Lake County, Michigan
• Lake County, Minnesota
• Lake County, Montana
• Lake County, Ohio
• Lake County, Oregon
• Lake County, South Dakota
• Lake County, Tennessee
• Lake and Peninsula Borough, Alaska
• Lake of the Woods County, Minnesota
• Lamar County, Alabama
• Lamar County, Georgia
• Lamar County, Mississippi
• Lamar County, Texas
• Lamb County, Texas
• Lamoille County, Vermont
• Lampasas County, Texas
• Lancaster County, Nebraska
• Lancaster County, Pennsylvania
• Lancaster County, South Carolina
• Lancaster County, Virginia
• Lander County, Nevada
• Lane County, Kansas
• Lane County, Oregon
• Langlade County, Wisconsin
• Lanier County, Georgia
• Lapeer County, Michigan
• Laramie County, Wyoming
• Larimer County, Colorado
• Larue County, Kentucky
• Las Animas County, Colorado
• Lassen County, California
• Latah County, Idaho
• Latimer County, Oklahoma
• Lauderdale County, Alabama
• Lauderdale County, Mississippi
• Lauderdale County, Tennessee
• Laurel County, Kentucky
• Laurens County, Georgia
• Laurens County, South Carolina
• Lavaca County, Texas
• Lawrence County, Alabama
• Lawrence County, Arkansas
• Lawrence County, Illinois
• Lawrence County, Indiana
• Lawrence County, Kentucky
• Lawrence County, Mississippi
• Lawrence County, Missouri
• Lawrence County, Ohio
• Lawrence County, Pennsylvania
• Lawrence County, South Dakota
• Lawrence County, Tennessee
• Le Flore County, Oklahoma
• Le Sueur County, Minnesota
• Lea County, New Mexico
• Leake County, Mississippi
• Leavenworth County, Kansas
• Lebanon County, Pennsylvania
• Lee County, Alabama
• Lee County, Arkansas
• Lee County, Florida
• Lee County, Georgia
• Lee County, Illinois
• Lee County, Iowa
• Lee County, Kentucky
• Lee County, Mississippi
• Lee County, North Carolina
• Lee County, South Carolina
• Lee County, Texas
• Lee County, Virginia
• Leelanau County, Michigan
• Leflore County, Mississippi
• Lehigh County, Pennsylvania
• Lemhi County, Idaho
• Lenawee County, Michigan
• Lenoir County, North Carolina
• Leon County, Florida
• Leon County, Texas
• Leslie County, Kentucky
• Letcher County, Kentucky
• Levy County, Florida
• Lewis County, Idaho
• Lewis County, Kentucky
• Lewis County, Missouri
• Lewis County, New York
• Lewis County, Tennessee
• Lewis County, Washington
• Lewis County, West Virginia
• Lewis and Clark County, Montana
• Lexington, Virginia
• Lexington County, South Carolina
• Liberty County, Florida
• Liberty County, Georgia
• Liberty County, Montana
• Liberty County, Texas
• Licking County, Ohio
• Limestone County, Alabama,
• Limestone County, Texas
• Lincoln County, Arkansas
• Lincoln County, Colorado
• Lincoln County, Georgia
• Lincoln County, Idaho
• Lincoln County, Kansas
• Lincoln County, Kentucky
• Lincoln County, Maine
• Lincoln County, Minnesota
• Lincoln County, Mississippi
• Lincoln County, Missouri
• Lincoln County, Montana
• Lincoln County, Nebraska
• Lincoln County, Nevada
• Lincoln County, New Mexico
• Lincoln County, North Carolina
• Lincoln County, Oklahoma
• Lincoln County, Oregon
• Lincoln County, South Dakota
• Lincoln County, Tennessee
• Lincoln County, Washington
• Lincoln County, West Virginia
• Lincoln County, Wisconsin
• Lincoln County, Wyoming
• Lincoln Parish, Louisiana
• Linn County, Iowa
• Linn County, Kansas
• Linn County, Missouri
• Linn County, Oregon
• Lipscomb County, Texas
• Litchfield County, Connecticut
• Little River County, Arkansas
• Live Oak County, Texas
• Livingston County, Illinois
• Livingston County, Kentucky
• Livingston County, Michigan
• Livingston County, Missouri
• Livingston County, New York
• Livingston Parish, Louisiana
• Llano County, Texas
• Logan County, Arkansas
• Logan County, Colorado
• Logan County, Illinois
• Logan County, Kansas
• Logan County, Kentucky
• Logan County, Nebraska
• Logan County, North Dakota
• Logan County, Ohio
• Logan County, Oklahoma
• Logan County, West Virginia
• Long County, Georgia
• Lonoke County, Arkansas
• Lorain County, Ohio
• Los Alamos County, New Mexico
• Los Angeles County, California
• Loudon County, Tennessee
• Loudoun County, Virginia
• Louisa County, Iowa
• Louisa County, Virginia
• Loup County, Nebraska
• Love County, Oklahoma
• Loving County, Texas
• Lowndes County, Alabama
• Lowndes County, Georgia
• Lowndes County, Mississippi
• Lubbock County, Texas
• Lucas County, Iowa
• Lucas County, Ohio
• Luce County, Michigan
• Lumpkin County, Georgia
• Luna County, New Mexico
• Lunenburg County, Virginia
• Luzerne County, Pennsylvania
• Lycoming County, Pennsylvania
• Lyman County, South Dakota
• Lynchburg, Virginia
• Lynn County, Texas
• Lyon County, Iowa
• Lyon County, Kansas
• Lyon County, Kentucky
• Lyon County, Minnesota
• Lyon County, Nevada

M

• Mackinac County, Michigan
• Macomb County, Michigan
• Macon County, Alabama
• Macon County, Georgia
• Macon County, Illinois
• Macon County, Missouri
• Macon County, North Carolina
• Macon County, Tennessee
• Macoupin County, Illinois
• Madera County, California
• Madison County, Alabama
• Madison County, Arkansas
• Madison County, Florida
• Madison County, Georgia
• Madison County, Idaho
• Madison County, Illinois
• Madison County, Indiana
• Madison County, Iowa
• Madison County, Kentucky
• Madison County, Mississippi
• Madison County, Missouri
• Madison County, Montana
• Madison County, Nebraska
• Madison County, New York
• Madison County, North Carolina
• Madison County, Ohio
• Madison County, Tennessee
• Madison County, Texas
• Madison County, Virginia
• Madison Parish, Louisiana
• Magoffin County, Kentucky
• Mahaska County, Iowa
• Mahnomen County, Minnesota
• Mahoning County, Ohio
• Major County, Oklahoma
• Malheur County, Oregon
• Manassas, Virginia
• Manassas Park, Virginia
• Manatee County, Florida
• Manistee County, Michigan
• Manitowoc County, Wisconsin
• Marathon County, Wisconsin
• Marengo County, Alabama
• Maricopa County, Arizona
• Maries County, Missouri
• Marin County, California
• Marinette County, Wisconsin
• Marion County, Alabama
• Marion County, Arkansas
• Marion County, Florida
• Marion County, Georgia
• Marion County, Illinois
• Marion County, Indiana
• Marion County, Iowa
• Marion County, Kansas
• Marion County, Kentucky
• Marion County, Mississippi
• Marion County, Missouri
• Marion County, Ohio
• Marion County, Oregon
• Marion County, South Carolina
• Marion County, Tennessee
• Marion County, Texas
• Marion County, West Virginia
• Mariposa County, California
• Marlboro County, South Carolina
• Marquette County, Michigan
• Marquette County, Wisconsin
• Marshall County, Alabama
• Marshall County, Illinois
• Marshall County, Indiana
• Marshall County, Iowa
• Marshall County, Kansas
• Marshall County, Kentucky
• Marshall County, Minnesota
• Marshall County, Mississippi
• Marshall County, Oklahoma
• Marshall County, South Dakota
• Marshall County, Tennessee
• Marshall County, West Virginia
• Martin County, Florida
• Martin County, Indiana
• Martin County, Kentucky
• Martin County, Minnesota
• Martin County, North Carolina
• Martin County, Texas
• Martinsville, Virginia
• Mason County, Illinois
• Mason County, Kentucky
• Mason County, Michigan
• Mason County, Texas
• Mason County, Washington
• Mason County, West Virginia
• Massac County, Illinois
• Matagorda County, Texas
• Matanuska-Susitna Borough, Alaska
• Mathews County, Virginia
• Maui County, Hawaii
• Maury County, Tennessee
• Maverick County, Texas
• Mayes County, Oklahoma
• McClain County, Oklahoma
• McCone County, Montana
• McCook County, South Dakota
• McCormick County, South Carolina
• McCracken County, Kentucky
• McCreary County, Kentucky
• McCulloch County, Texas
• McCurtain County, Oklahoma
• McDonald County, Missouri
• McDonough County, Illinois
• McDowell County, North Carolina
• McDowell County, West Virginia
• McDuffie County, Georgia
• McHenry County, Illinois
• McHenry County, North Dakota
• McIntosh County, Georgia
• McIntosh County, North Dakota
• McIntosh County, Oklahoma
• McKean County, Pennsylvania
• McKenzie County, North Dakota
• McKinley County, New Mexico
• McLean County, Illinois
• McLean County, Kentucky
• McLean County, North Dakota
• McLennan County, Texas
• McLeod County, Minnesota
• McMinn County, Tennessee
• McMullen County, Texas
• McNairy County, Tennessee
• McPherson County, Kansas
• McPherson County, Nebraska
• McPherson County, South Dakota
• Meade County, Kansas
• Meade County, Kentucky
• Meade County, South Dakota
• Meagher County, Montana
• Mecklenburg County, North Carolina
• Mecklenburg County, Virginia
• Mecosta County, Michigan
• Medina County, Ohio
• Medina County, Texas
• Meeker County, Minnesota
• Meigs County, Ohio
• Meigs County, Tennessee
• Mellette County, South Dakota
• Menard County, Illinois
• Menard County, Texas
• Mendocino County, California
• Menifee County, Kentucky
• Menominee County, Michigan
• Menominee County, Wisconsin
• Merced County, California
• Mercer County, Illinois
• Mercer County, Kentucky
• Mercer County, Missouri
• Mercer County, New Jersey
• Mercer County, North Dakota
• Mercer County, Ohio
• Mercer County, Pennsylvania
• Mercer County, West Virginia
• Meriwether County, Georgia
• Merrick County, Nebraska
• Merrimack County, New Hampshire
• Mesa County, Colorado
• Metcalfe County, Kentucky
• Miami County, Indiana
• Miami County, Kansas
• Miami County, Ohio
• Miami-Dade County, Florida
• Middlesex County, Connecticut
• Middlesex County, Massachusetts
• Middlesex County, New Jersey
• Middlesex County, Virginia
• Midland County, Michigan
• Midland County, Texas
• Mifflin County, Pennsylvania
• Milam County, Texas
• Millard County, Utah
• Mille Lacs County, Minnesota
• Miller County, Arkansas
• Miller County, Georgia
• Miller County, Missouri
• Mills County, Iowa
• Mills County, Texas
• Milwaukee County, Wisconsin
• Miner County, South Dakota
• Mineral County, Colorado
• Mineral County, Montana
• Mineral County, Nevada
• Mineral County, West Virginia
• Mingo County, West Virginia
• Minidoka County, Idaho
• Minnehaha County, South Dakota
• Missaukee County, Michigan
• Mississippi County, Arkansas
• Mississippi County, Missouri
• Missoula County, Montana
• Mitchell County, Georgia
• Mitchell County, Iowa
• Mitchell County, Kansas
• Mitchell County, North Carolina
• Mitchell County, Texas
• Mobile County, Alabama
• Modoc County, California
• Moffat County, Colorado
• Mohave County, Arizona
• Moniteau County, Missouri
• Monmouth County, New Jersey
• Mono County, California
• Monona County, Iowa
• Monongalia County, West Virginia
• Monroe County, Alabama
• Monroe County, Arkansas
• Monroe County, Florida
• Monroe County, Georgia
• Monroe County, Illinois
• Monroe County, Indiana
• Monroe County, Iowa
• Monroe County, Kentucky
• Monroe County, Michigan
• Monroe County, Mississippi
• Monroe County, Missouri
• Monroe County, New York
• Monroe County, Ohio
• Monroe County, Pennsylvania
• Monroe County, Tennessee
• Monroe County, West Virginia
• Monroe County, Wisconsin
• Montague County, Texas
• Montcalm County, Michigan
• Monterey County, California
• Montezuma County, Colorado
• Montgomery County, Alabama
• Montgomery County, Arkansas
• Montgomery County, Georgia
• Montgomery County, Illinois
• Montgomery County, Indiana
• Montgomery County, Iowa
• Montgomery County, Kansas
• Montgomery County, Kentucky
• Montgomery County, Maryland
• Montgomery County, Mississippi
• Montgomery County, Missouri
• Montgomery County, New York
• Montgomery County, North Carolina
• Montgomery County, Ohio
• Montgomery County, Pennsylvania
• Montgomery County, Tennessee
• Montgomery County, Texas
• Montgomery County, Virginia
• Montmorency County, Michigan
• Montour County, Pennsylvania
• Montrose County, Colorado
• Moody County, South Dakota
• Moore County, North Carolina
• Moore County, Tennessee
• Moore County, Texas
• Mora County, New Mexico
• Morehouse Parish, Louisiana
• Morgan County, Alabama
• Morgan County, Colorado
• Morgan County, Georgia
• Morgan County, Illinois
• Morgan County, Indiana
• Morgan County, Kentucky
• Morgan County, Missouri
• Morgan County, Ohio
• Morgan County, Tennessee
• Morgan County, Utah
• Morgan County, West Virginia
• Morrill County, Nebraska
• Morris County, Kansas
• Morris County, New Jersey
• Morris County, Texas
• Morrison County, Minnesota
• Morrow County, Ohio
• Morrow County, Oregon
• Morton County, Kansas
• Morton County, North Dakota
• Motley County, Texas
• Moultrie County, Illinois
• Mountrail County, North Dakota
• Mower County, Minnesota
• Muhlenberg County, Kentucky
• Multnomah County, Oregon
• Murray County, Georgia
• Murray County, Minnesota
• Murray County, Oklahoma
• Muscatine County, Iowa
• Muscogee County, Georgia
• Muskegon County, Michigan
• Muskingum County, Ohio
• Muskogee County, Oklahoma
• Musselshell County, Montana

See Also

• Lists of U.S. county name etymologies for links to the remainder of the list.