Logan County is a county in the west central portion of the U.S. state of Ohio. As of the 2020 census, the population was 46,150. The county seat is Bellefontaine. The county is named for Benjamin Logan, who fought Native Americans in the area. Logan County comprises the Bellefontaine, OH Micropolitan Statistical Area, which is also included in the Columbus-Marion-Zanesville, OH Combined Statistical Area.

According to the U.S. Census Bureau, the county has an area of 467 square miles (1,210 km), of which 458 square miles (1,190 km) is land and 8.3 square miles (21 km) (1.8%) is water. Campbell Hill, the highest natural point in Ohio at 1,549 feet (472 m), is northeast of Bellefontaine.

• Hardin County (north)
• Union County (east)
• Champaign County (south)
• Shelby County (west)
• Auglaize County (northwest)

• U.S. Route 33
• U.S. Route 68
• State Route 47
• State Route 117
• State Route 235
• State Route 245
• State Route 273
• State Route 274
• State Route 287
• State Route 292
• State Route 347
• State Route 365
• State Route 366
• State Route 368
• State Route 508
• State Route 533
• State Route 540
• State Route 559
• State Route 706
• State Route 708
• State Route 720

Historical population

Census	Pop.	Note	%±
1820	3,159		—
1830	6,440		103.9%
1840	14,015		117.6%
1850	19,162		36.7%
1860	20,996		9.6%
1870	23,028		9.7%
1880	26,267		14.1%
1890	27,386		4.3%
1900	30,420		11.1%
1910	30,084		−1.1%
1920	30,104		0.1%
1930	28,981		−3.7%
1940	29,624		2.2%
1950	31,329		5.8%
1960	34,803		11.1%
1970	35,072		0.8%
1980	39,155		11.6%
1990	42,310		8.1%
2000	46,005		8.7%
2010	45,858		−0.3%
2020	46,150		0.6%
U.S. Decennial Census 1790-1960 1900-1990 1990-2000 2020

As of the census of 2000, there were 46,005 people, 17,956 households, and 12,730 families living in the county. The population density was 100 inhabitants per square mile (39/km). There were 21,571 housing units at an average density of 47 units per square mile (18/km). The racial makeup of the county was 96.15% White, 1.71% Black or African American, 0.20% Native American, 0.40% Asian, 0.03% Pacific Islander, 0.27% from other races, and 1.24% from two or more races. 0.72% of the population were Hispanic or Latino of any race. 96.8% spoke English, 1.0% German and 1.0% Spanish as their first language.

There were 17,956 households, out of which 33.30% had children under the age of 18 living with them, 57.00% were married couples living together, 9.50% had a female householder with no husband present, and 29.10% were non-families. 24.80% of all households were made up of individuals, and 10.30% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.01.

In the county, the population was spread out, with 26.70% under the age of 18, 8.20% from 18 to 24, 27.90% from 25 to 44, 23.30% from 45 to 64, and 13.90% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 96.10 males. For every 100 females age 18 and over, there were 93.60 males.

The median income for a household in the county was $41,479, and the median income for a family was $47,516. Males had a median income of $37,134 versus $24,739 for females. The per capita income for the county was $18,984. About 7.10% of families and 9.30% of the population were below the poverty line, including 11.80% of those under age 18 and 8.50% of those age 65 or over.

As of the 2010 United States Census, there were 45,858 people, 18,111 households, and 12,569 families living in the county. The population density was 100.0 inhabitants per square mile (38.6/km). There were 23,181 housing units at an average density of 50.6 units per square mile (19.5 units/km). The racial makeup of the county was 95.3% white, 1.6% black or African American, 0.5% Asian, 0.3% American Indian, 0.3% from other races, and 1.9% from two or more races. Those of Hispanic or Latino origin made up 1.2% of the population. In terms of ancestry, 30.9% were German, 13.5% were Irish, 11.5% were American, and 9.1% were English.

Of the 18,111 households, 32.9% had children under the age of 18 living with them, 53.9% were married couples living together, 10.5% had a female householder with no husband present, 30.6% were non-families, and 25.5% of all households were made up of individuals. The average household size was 2.51 and the average family size was 2.98. The median age was 39.9 years.

The median income for a household in the county was $46,493 and the median income for a family was $53,601. Males had a median income of $42,702 versus $29,537 for females. The per capita income for the county was $22,974. About 11.0% of families and 14.8% of the population were below the poverty line, including 25.3% of those under age 18 and 7.1% of those age 65 or over.

Logan County is a strongly Republican county, having backed Democratic Party presidential nominees only twice since 1856, in 1912 and 1964.

United States presidential election results for Logan County, Ohio

Year	Republican		Democratic		Third party(ies)
	No.	%	No.	%	No.	%
2020	17,964	76.74%	5,055	21.59%	390	1.67%
2016	15,957	73.49%	4,647	21.40%	1,108	5.10%
2012	13,633	64.31%	7,062	33.31%	504	2.38%
2008	13,848	62.15%	7,936	35.61%	499	2.24%
2004	14,471	67.63%	6,825	31.90%	102	0.48%
2000	11,849	64.20%	5,945	32.21%	661	3.58%
1996	8,325	48.56%	6,397	37.31%	2,423	14.13%
1992	9,364	49.84%	4,889	26.02%	4,534	24.13%
1988	11,099	70.71%	4,484	28.57%	114	0.73%
1984	12,230	76.54%	3,645	22.81%	104	0.65%
1980	9,727	64.87%	4,319	28.80%	948	6.32%
1976	9,092	59.03%	5,949	38.62%	361	2.34%
1972	10,938	71.12%	3,786	24.62%	656	4.27%
1968	8,362	56.12%	4,889	32.81%	1,648	11.06%
1964	6,683	44.06%	8,484	55.94%	0	0.00%
1960	11,311	68.18%	5,279	31.82%	0	0.00%
1956	11,229	72.66%	4,226	27.34%	0	0.00%
1952	11,084	69.81%	4,793	30.19%	0	0.00%
1948	8,118	61.01%	5,149	38.70%	38	0.29%
1944	9,882	66.65%	4,944	33.35%	0	0.00%
1940	9,861	60.83%	6,351	39.17%	0	0.00%
1936	8,363	52.58%	7,353	46.23%	189	1.19%
1932	7,469	52.04%	6,678	46.53%	205	1.43%
1928	9,602	76.63%	2,858	22.81%	71	0.57%
1924	7,186	61.03%	3,176	26.97%	1,412	11.99%
1920	8,521	63.21%	4,904	36.38%	56	0.42%
1916	4,345	54.80%	3,483	43.93%	101	1.27%
1912	1,977	27.07%	2,727	37.34%	2,600	35.60%
1908	4,756	58.44%	3,186	39.15%	196	2.41%
1904	4,994	69.21%	1,939	26.87%	283	3.92%
1900	4,806	60.38%	2,951	37.08%	202	2.54%
1896	4,722	59.56%	3,125	39.42%	81	1.02%
1892	3,796	57.85%	2,332	35.54%	434	6.61%
1888	4,115	59.34%	2,533	36.52%	287	4.14%
1884	3,998	58.83%	2,625	38.63%	173	2.55%
1880	3,739	59.16%	2,468	39.05%	113	1.79%
1876	3,259	57.98%	2,286	40.67%	76	1.35%
1872	2,795	58.74%	1,955	41.09%	8	0.17%
1868	2,778	61.08%	1,770	38.92%	0	0.00%
1864	2,637	61.86%	1,626	38.14%	0	0.00%
1860	2,415	59.28%	1,542	37.85%	117	2.87%
1856	2,093	56.75%	1,328	36.01%	267	7.24%

• Commissioners: Mark Robinson (R), Joe Antram (R), Mike Yoder (R)
• Auditor: Jack Reser (R)
• Clerk of Courts: Barb McDonald (R)
• Recorder: Pat Myers (R) (appointed July 2, 2013)
• Treasurer:Rhonda Stafford (R)
• Prosecuting Attorney: Eric Stewart (R)
• Sheriff: Randall J. Dodds (R)
• Engineer: Scott Coleman (R)
• Coroner: John C. O'Connor (R)
• Judge Court of Common Pleas: Kevin P. Braig (R)
• Judge Court of Common Pleas Probate/Juvenile Division: Kim Kellogg-Martin (R)
• Judge Court of Common Pleas Domestic Relations-Juv.-Probate Division: Natasha Kennedy (R)
• Judge Municipal Court: Jacob Estes (R)

• Bellefontaine (county seat)

• Chippewa Park
• East Liberty
• Lewistown

• George Bartholomew - inventor of concrete pavement
• Blue Jacket (Weyapiersenwah) - Shawnee chief
• Bethany Dillon - singer; nominee for 2004 Gospel Music Association New Artist of the Year award
• Allan W. Eckert - author
• Jim Flora - artist
• Melville J. Herskovits - anthropologist
• Kin Hubbard - cartoonist and journalist
• Samuel Johnston - professional wrestler
• Edward D. Jones - investment banker
• Austin Eldon Knowlton - architect
• William Lawrence - Republican politician involved with the attempt to impeach Andrew Johnson, creating the United States Department of Justice, helping to create the American Red Cross, and ratifying the Geneva Convention
• The Mills Brothers - entertainers
• Raymond Stanton Patton (1882–1937), rear admiral and first flag officer of the United States Coast and Geodetic Survey Corps and second Director of the United States Coast and Geodetic Survey (1929–1937)
• Norman Vincent Peale - minister and author

• National Register of Historic Places listings in Logan County, Ohio

• County website

40°23′N 83°46′W / 40.39°N 83.77°W / 40.39; -83.77