Dinwiddie County is a county located in the Commonwealth of Virginia. As of the 2020 census, the population was 27,947. Its county seat is Dinwiddie.

Dinwiddie County is part of the Richmond, VA Metropolitan Statistical Area.

The first inhabitants of the area were Paleo-Indians, prior to 8000 BC. They are believed to have been nomadic hunter-gatherers following animal migrations. Early stone tools have been discovered in various fields within the county. At the time of European contact, Native Americans made their homes in the region.

Dinwiddie County was formed May 1, 1752, from Prince George County. The county is named for Robert Dinwiddie, Lieutenant Governor of Virginia, 1751–58. The county raised several militia units that would fight in the American Revolution.

Dinwiddie County was the birthplace of Elizabeth (Burwell) Hobbs Keckly, a free black dressmaker who worked for two presidents' wives: Mrs. Jefferson Davis and later Mary Todd Lincoln. Thomas Day was also a native; he was well known later at Milton, North Carolina, as a free black cabinetmaker. Another native son was Dr. Thomas Stewart, perhaps America's first free black 18th-century rural physician.

During the Civil War the Battle of Lewis's Farm was fought along Quaker Road [Rt. 660]. It took place on March 29, 1865. This was the first in several attempts by Union General Ulysses S. Grant to cut Robert E. Lee's final supply line—the Southside Railroad—in the spring of 1865. Here the Union forces led by Brig. Gen. Joshua L. Chamberlain engaged Confederates under Maj. Gen. Bushrod R. Johnson. After sharp fighting, the Union troops entrenched nearby along the Boydton Plank Road, and Johnson withdrew to his lines at White Oak Road. The Union army cut the rail line four days later, after capturing Five Forks on April 1, 1865, at the Battle of Five Forks. Several other engagements were fought in Dinwiddie County, including the Battle of Dinwiddie Court House, Battle of Sutherland's Station, and Battle of White Oak Road.

The Dinwiddie County Historical Society currently occupies the historic Dinwiddie County Court House.

• Battle of Peebles' Farm
• Battle of Lewis's Farm
• Battle of Dinwiddie Court House
• Battle of White Oak Road
• Battle of Five Forks
• Battle of Sutherland's Station

Dinwiddie is located in southern Virginia, southwest of the independent city of Petersburg, which separated from the county (and adjacent Prince George County) in 1871. According to the U.S. Census Bureau, the county has a total area of 507 square miles (1,310 km), of which 504 square miles (1,310 km) is land and 3.5 square miles (9.1 km) (0.7%) is water. It is located between two US Army forts, Fort Gregg-Adams to the east and Fort Barfoot to the west.

• Chesterfield County – north
• Petersburg City – northeast
• Prince George County – east
• Sussex County – southeast
• Greensville County – south
• Brunswick County – southwest
• Nottoway County – west
• Amelia County – northwest

• Petersburg National Battlefield (part)

• I-85
• US 1
• US 460
• 
  US 460 Bus.
• SR 40
• SR 142
• SR 226

Historical population

Census	Pop.	Note	%±
1790	13,934		—
1800	15,374		10.3%
1810	18,190		18.3%
1820	20,482		12.6%
1830	21,901		6.9%
1840	22,558		3.0%
1850	25,118		11.3%
1860	30,198		20.2%
1870	30,702		1.7%
1880	32,870		7.1%
1890	13,515		−58.9%
1900	15,374		13.8%
1910	15,442		0.4%
1920	17,949		16.2%
1930	18,492		3.0%
1940	18,166		−1.8%
1950	18,839		3.7%
1960	22,183		17.8%
1970	25,046		12.9%
1980	22,602		−9.8%
1990	20,960		−7.3%
2000	24,533		17.0%
2010	28,001		14.1%
2020	27,947		−0.2%
2021 (est.)	27,912		−0.1%
U.S. Decennial Census 1790–1960 1900–1990 1990–2000 2010 2020

Dinwiddie County, Virginia – Racial and ethnic composition
Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.

Race / Ethnicity (NH = Non-Hispanic)	Pop 2010	Pop 2020	% 2010	% 2020
White alone (NH)	17,617	17,346	62.92%	62.07%
Black or African American alone (NH)	9,134	8,115	32.62%	29.04%
Native American or Alaska Native alone (NH)	83	91	0.30%	0.33%
Asian alone (NH)	122	119	0.44%	0.43%
Pacific Islander alone (NH)	7	3	0.02%	0.01%
Some Other Race alone (NH)	18	102	0.06%	0.36%
Mixed Race or Multi-Racial (NH)	346	1,043	1.24%	3.73%
Hispanic or Latino (any race)	674	1,128	2.41%	4.04%
Total	28,001	27,947	100.00%	100.00%

As of the census of 2000, there were 24,533 people, 9,107 households, and 6,720 families residing in the county. The population density was 49 people per square mile (19 people/km). There were 9,707 housing units at an average density of 19 units per square mile (7.3 units/km). The racial makeup of the county was 64.55% White, 33.66% Black or African American, 0.22% Native American, 0.31% Asian, 0.04% Pacific Islander, 0.40% from other races, and 0.82% from two or more races. 0.97% of the population were Hispanic or Latino of any race.

There were 9,107 households, out of which 32.10% had children under the age of 18 living with them, 54.80% were married couples living together, 13.90% had a female householder with no husband present, and 26.20% were non-families. 22.20% of all households were made up of individuals, and 8.50% had someone living alone who was 65 years of age or older. The average household size was 2.58 and the average family size was 3.01.

In the county, the population was spread out, with 24.00% under the age of 18, 6.70% from 18 to 24, 30.90% from 25 to 44, 26.20% from 45 to 64, and 12.20% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 98.80 males. For every 100 females age 18 and over, there were 96.00 males.

The median income for a household in the county was $41,582, and the median income for a family was $47,961. Males had a median income of $32,860 versus $24,346 for females. The per capita income for the county was $19,122. About 6.60% of families and 9.30% of the population were below the poverty line, including 11.60% of those under age 18 and 12.60% of those age 65 or over.

• District 1: Harrison A. Moody (D)
• District 2: Mark E. Moore (I)
• District 3: William D. Chavis (I)
• District 4: Daniel D. Lee (I)
• District 5: Brenda K. Ebron-Bonner (D)

• Clerk of the Circuit Court: John Barrett Chappell, Jr. (D)
• Commissioner of the Revenue: Lori K. Stevens (R)
• Commonwealth's Attorney: Amanda Nicole Mann (I)
• Sheriff: D.T. "Duck" Adams (D)
• Treasurer: Jennifer Caraway Perkins (D)

Dinwiddie County is currently represented by Republican Frank Ruff of the 15th district and Democrat Joe Morrissey of the 16th district in the Virginia Senate. In the Virginia House of Delegates, the county is represented by Republicans Kim Taylor of the 63rd district and Otto Wachsmann of the 75th district. The county is represented by Democrat Jennifer McClellan of Virginia's 4th congressional district in the U.S. House of Representatives.

United States presidential election results for Dinwiddie County, Virginia

Year	Republican		Democratic		Third party(ies)
	No.	%	No.	%	No.	%
2024	9,549	61.17%	5,942	38.06%	120	0.77%
2020	8,695	57.61%	6,224	41.24%	173	1.15%
2016	7,447	54.86%	5,765	42.47%	363	2.67%
2012	6,875	50.59%	6,550	48.20%	164	1.21%
2008	6,526	50.62%	6,246	48.45%	120	0.93%
2004	6,193	57.14%	4,569	42.15%	77	0.71%
2000	4,959	54.28%	4,001	43.79%	176	1.93%
1996	3,503	42.90%	3,871	47.40%	792	9.70%
1992	3,648	42.43%	3,624	42.15%	1,325	15.41%
1988	4,165	54.38%	3,405	44.46%	89	1.16%
1984	4,547	56.04%	3,485	42.95%	82	1.01%
1980	3,369	48.01%	3,475	49.52%	174	2.48%
1976	2,413	37.28%	3,873	59.83%	187	2.89%
1972	3,314	62.47%	1,901	35.83%	90	1.70%
1968	1,451	27.60%	1,551	29.50%	2,255	42.90%
1964	2,096	48.91%	2,182	50.92%	7	0.16%
1960	935	34.81%	1,714	63.81%	37	1.38%
1956	807	30.71%	1,282	48.78%	539	20.51%
1952	983	39.77%	1,462	59.14%	27	1.09%
1948	261	17.40%	961	64.07%	278	18.53%
1944	279	20.26%	1,096	79.59%	2	0.15%
1940	264	18.86%	1,129	80.64%	7	0.50%
1936	127	8.61%	1,343	91.05%	5	0.34%
1932	104	9.12%	1,028	90.18%	8	0.70%
1928	332	26.00%	945	74.00%	0	0.00%
1924	122	14.70%	685	82.53%	23	2.77%
1920	186	22.57%	636	77.18%	2	0.24%
1916	85	12.54%	592	87.32%	1	0.15%
1912	58	8.91%	512	78.65%	81	12.44%

The Bureau of Economic Analysis combines the independent cities of Petersburg and Colonial Heights with Dinwiddie County for statistical purposes.

• McKenney

• Dinwiddie (county seat)

• Ammon
• Carson
• Church Road
• DeWitt
• Darvils
• Ford
• Sutherland
• Wilsons

Appomattox Regional Library serves as the public library for the area.

• Dinwiddie County official website

37°05′N 77°38′W / 37.08°N 77.63°W / 37.08; -77.63