There were 3,456 households of which 28.7% had children under the age of 18 living with them, 42.6% were married couples living together, 16.9% had a female householder with no husband present, and 34.5% were non-families. 27.4% of all households were made up of individuals and 8.6% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.19.
In the township, 23.5% of the population were under the age of 18, 9.6% from 18 to 24, 28.7% from 25 to 44, 27.1% from 45 to 64, and 11.1% who were 65 years of age or older. The median age was 36.3 years. For every 100 females there were 102.8 males. For every 100 females age 18 and over, there were 100.1 males.
The Census Bureau's 2006-2010 American Community Survey showed that (in 2010 inflation-adjusted dollars) median household income was $53,841 (with a margin of error of +/- $4,427) and the median family income was $68,500 (+/- $4,684). Males had a median income of $51,945 (+/- $5,141) versus $37,079 (+/- $5,759) for females. The per capita income for the borough was $24,551 (+/- $1,785). About 7.1% of families and 12.2% of the population were below the poverty line, including 21.4% of those under age 18 and 8.8% of those age 65 or over.
There were 3,903 households out of which 32.0% had children under the age of 18 living with them, 44.0% were married couples living together, 17.3% had a female householder with no husband present, and 33.8% were non-families. 27.2% of all households were made up of individuals and 10.0% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.20.
In the township the age distribution of the population shows 26.3% under the age of 18, 9.4% from 18 to 24, 32.2% from 25 to 44, 19.6% from 45 to 64, and 12.4% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 99.7 males. For every 100 females age 18 and over, there were 96.6 males.
The median income for a household in the township was $43,284, and the median income for a family was $52,000. Males had a median income of $38,186 versus $27,425 for females. The per capita income for the township was $19,672. About 6.8% of families and 9.9% of the population were below the poverty line, including 11.4% of those under age 18 and 10.4% of those age 65 or over.
Mount Holly Township operates within the Faulkner Act under the Council-Manager (plan 12) form of municipal government, enacted by council-initiated action as of July 1, 1990. Members of the township council are elected at-large in a non-partisan vote to serve four-year terms of office on a staggered basis, with either two or three seats up for election in even-numbered years as part of the November general election. At a reorganization meeting after each election, the council selects a mayor and a deputy mayor from among its members. In November 2011, voters passed a referendum making Mount Holly the fourth municipality to shift its non-partisan municipal elections from May to November.
As of 2014[update], members of the Mount Holly Township Council are Mayor Richard DiFolco (term ends December 31, 2016), Deputy mayor Jason Jones (2016), Dwynne Belton (2014), Lew Brown (2016) and Richard Dow (2014).
In July 2011, Township Council member Kimberly Kersey resigned. In the November 2011 general election, Richard DiFolco was selected to fill the Kersey's vacancy.
On May 11, 2010, voters of the Township elected Richard Dow, III and Dywnne Belton to Township Council, replacing incumbents Jules Thiessen and Brooke Tidswell, III, who served on the Council for 16 and 12 years, respectively. Dow received 557 votes, Belton 475, Christopher Sorhaindo, Dow's running mate, 470, Theissen, 377, and Tidswell, 353 votes.
On November 8, 2011, voters of the Township elected Rich DiFolco to Township Council, who will serve the remainder of Kimberly Kersey's seat. Voters also approved the public question moving the May municipal election to November moving forward.
On November 6, 2012, voters of the Township elected Lew Brown, Rich DiFolco and Jason Jones to 4-year terms on Town Council by a large margin, their terms will begin January 1, 2013.
On January 12, 2014, former mayor Richard Dow, submitted his resignation as council member. 
On March 31, 2014, five people filed petitions to appear on the primary ballot for two four-year terms for Township Council. Former mayor and current Mount Holly Municipal Utilities Authority Commissioner Jules Thiessen, current Mount Holly Board of Education Vice President Tim Young, and current Mount Holly Board of Education member and Planning Board Chairman Brian Grant filed to run for the democratic nominations. Wife of Mayor Rich DiFolco, Janet DiFolco, and Patricia Cauley filed for the republican nomination. 
The first European settlement in what is now Mount Holly began in 1677, when Walter Reeves acquired land from the Lenape (Delaware) Native Americans living in the area. He constructed a dam on Rancocas Creek to channel water through a raceway to power a grist mill and saw mill. Edward Gaskill and his sons hand dug the mill race on their property between 1720 and 1723. After the mills were established, more settlers were attracted to the area and built houses and commercial buildings on High, Church, White, Mill, and Pine streets, including the Shinn Curtis Log House (1712). By 1800, over 250 dwellings had been built.
Today no mills remain on the raceway, which still flows in its original course from the Rancocas just above the dam. The raceway proved a way for herring to make their way above the dam and was the scene of an annual fish run in the spring which provided fresh herring for slating and eating. The former mill land has been preserved as the Mill Dam Park. It marks the importance of mills to the early settlements.
Revolutionary War era
On December 17, 1776, Colonel Samuel Griffin of the Continental Army crossed the Delaware River with 600 men — mostly untrained men and boys, and with little equipment — and marched to Mount Holly, where he set up a few "3-pounder" artillery pieces on Iron Works Hill. Hessian commanders von Block and Carl von Donop, were told that there were 3,000 American troops at Mount Holly.
By December 23, 1776, 2,000 Hessians were moved from Bordentown and positioned at The Mount in Mount Holly, where they engaged in a three day-long artillery exchange, known as the Battle of Iron Works Hill or Battle of Mount Holly, with the Americans on Iron Works Hill. The Americans slipped away that night.
Burlington County Prison in Mount Holly, New Jersey. Photo circa 1938.
The 1793 state legislature approved the relocation of the Burlington County seat from Burlington City to Mount Holly, which was approved by voters in a 1796 referendum.[page needed] Several important municipal buildings were constructed, including the courthouse in 1796 and the county prison built circa 1819. The Burlington County Prison was designed by Robert Mills, a nationally known architect who designed the Washington Monument. The town has numerous 18th and 19th-century buildings, most of which are included in the Mount Holly Historic District; it is listed in the New Jersey and National Register of Historic Places. Commercial buildings were constructed primarily along High Street.
In 1849, the Burlington and Mount Holly Railroad was established, connecting communities along the Delaware River to Philadelphia, the major city of the area. The railroad supported industrialization along its route. The Camden and Mount Holly Railroad constructed a station 20 years later near the intersection of Washington and King streets.
In the late 1950s, Mount Holly began to have economic difficulties due to industrial restructuring and the loss of working-class jobs. In the post-World War II period, numerous blue collar, family wage jobs disappeared as the community's traditional employers, the mills and dye factories, were shut down. Initially the effect of the job losses was lessened by increased employment at the nearby military bases, Fort Dix and McGuire Air Force Base, especially during the period of the Vietnam War. In 1970, the residential vacancy rate in Mount Holly was 4.3%.
By 1980, however, the vacancy rate had climbed to 8.7% as a result of the nearby military installations' downsizing after the end of the Vietnam War. During this same period, 1970–1980, shopping malls proliferated in the suburban Philadelphia area, and retail business in Mount Holly suffered. Mount Holly received Urban Enterprise Zone (UEZ) status in 1995; it has provided tax incentives and other assistance programs to local businesses, including lowering the sales tax rate to 3½, half of the prevailing rate charges statewide. This has helped to revive the local small business base.
Roads and highways
The township had a total of 38.43 miles (61.85 km) of roadways, of which 29.11 miles (46.85 km) are maintained by the municipality, 8.45 miles (13.60 km) by Burlington County and 0.87 miles (1.40 km) by the New Jersey Department of Transportation.
Shinn Curtis Log House, constructed out of hand-hewn logs, the house was built in 1712; the original log house was uncovered in 1967. A larger house that had been built around it was demolished, revealing the early house beneath, which has been restored.
Burlington County Prison, opened in 1819, it was the oldest continually operated prison in the country when it closed in 1965 after more than 150 years of service.
Old Courthouse Complex, designed by Samuel Lewis and constructed in 1796.
^Weather Forecast Office for Philaldelphia / Mount Holly, National Weather Service. Accessed August 11, 2013. "The Mount Holly NWSFO serves approximately eleven million people in thirty-four (34) counties located within Delaware, Maryland, New Jersey and Pennsylvania. The office is located at 732 Woodlane Road (State Route 630) off of State Route 541 in Westampton Township, Burlington County, New Jersey."
^Krebs, Rose. "Mount Holly voters approve election date change, select new council member", Burlington County Times, November 9, 2011. Accessed October 19, 2013. "The township got a taste of what will be the new norm for its municipal elections: voting in November.On Tuesday, voters resoundingly supported a measure to change municipal elections from May to November by a 1,051 to 196 vote, according to unofficial results. Bass River, Bordentown City and Medford Lakes are now the only county towns that still hold May municipal elections."
^Krebs, Rose. "Change comes to Mt. Holly township government", Burlington County Times, January 3, 2013. Accessed October 19, 2013. "'It's an absolute honor,' Richard Dow said after being sworn in as mayor at the Township Council’s reorganization Tuesday.... Also Tuesday, Rich DiFolco was named deputy mayor, and Jason Jones and Lew Brown were sworn in as new members. The three were elected to four-year terms in November. The other councilman is Dwynne Belton."
^Nutt, Amy Ellis (October 31, 2013). "Booker is officially a U.S. senator after being sworn in". NJ.com/Associated Press. Accessed October 31, 2013. "Former Newark Mayor Cory Booker was sworn in as a Democratic senator from New Jersey today, taking the oath of office, exchanging hugs with Vice President Joe Biden and acknowledging the applause of friends and family members seated in the visitor's gallery that rings the chamber.... Booker, 44, was elected to fill out the term of the late Sen. Frank Lautenberg, who died earlier this year."
^History of the Schools, Rancocas Valley Regional High School. Accessed June 21, 2012. "Rancocas Valley Regional High School District, located in historic Mount Holly, serves approximately 40 square miles of the suburban, single-family home townships of Eastampton (6,528), Hainesport (5,951), Lumberton (11,957), Mount Holly (10,230) and Westampton (8,661)."
^Prison Museum Brochure, Burlington County, New Jersey. Accessed November 27, 2013. "The Burlington County Prison Museum is a national historic landmark located in the heart of historic Mount Holly, New Jersey. Designed by Robert Mills, one of America's first native-born and trained architects, the Burlington County Prison was completed in 1811.... In fact, it was so well constructed that it remained in constant use until 1965."
^Staff. "Old Courthouse Repairs", Burlington County Times, May 29, 2012. Accessed November 27, 2013. "John Shaw with Buck Construction of West Berlin repairs the 9-foot doors at the entrance of the Historic Burlington County Court House in Mount Holly. The Samuel Lewis designed court house was built in 1796."
^Winchester, James H. "America's Oldest Volunteer Fire Group", Christian Science Monitor, December 29, 1961. Accessed June 21, 2012. Quote: "Some 210 years ago--nearly a quarter of a century before the adoption of the Declaration of Independence -- 13 men gathered in the Town Hall at Bridgetown, N.J., which is now Mount Holly, to draw up the by-laws and create the Relief Volunteer Fire Company, now the oldest in the United States."
^Jome page, Woolman Central. Accessed October 19, 2013. "Located at 99 Branch Street, Mount Holly, New Jersey, the Memorial house was built between 1771 and 1783 and is on the site of part of John Woolman's orchard."
^Who Was Who in America, Historical Volume, 1607-1896. Chicago: Marquis Who's Who. 1963.
^Lundy, F. L., et al. Manual of the Legislature of New Jersey, Volume 145, p. 329. J.A. Fitzgerald, 1921. Accessed November 27, 2013. "CHARLES C. BLACK, Jersey City. Justice Black was born on a farm in Burlington county, near Mount Holly, N. J., on July 29th, 1858."
^Staff. "PAUL R. DOGUEREAU, PIANIST AND MENTOR", The Philadelphia Inquirer, March 11, 2000. Accessed March 1, 2011. "Paul Rene Doguereau, 91, a pianist and interpreter of French music as well as a teacher and mentor to many younger pianists, died March 3 in the Virtua-Mount Holly Center, Mount Holly. A resident of Boston for more than 60 years, he and his adopted son, Harrison James Wignall, also maintained a home in Mount Holly for the last 2 1/2 years. He had stayed in Mount Holly since last March and in the nursing home for the last several months."
^Staff. "PUNK, PERSPIRATION & PAVEMENT", The Detroit News, July 26, 2007. Accessed March 1, 2011. ""Mount Holly, NJ, group the High Court hopes to receive some of the Warped Tour magic that's propelled bands such as Fall Out Boy and My Chemical Romance ..."
^Friedman, Sally. "Poet gave words a stage", The Philadelphia Inquirer, November 6, 2001. Accessed March 1, 2011. "How fitting, then, that 10 days ago that college theater in Pemberton Township was renamed the Geraldine Clinton Little Theatre in memory of the gentle woman, who lived quietly in Mount Holly but whose words touched so many souls and ignited so many spirits."
^Staff. "DEATH LIST OF A DAY.; Barclay White.", The New York Times, November 24, 1906. Accessed June 21, 2012. "MOUNT HOLLY, N. J., Nov. 23- Barclay White, 85 years old, of this city, a descendant of one of the oldest families in this part of New Jersey and one of the oldest settlers in Mount Holly, a prominent citizen of this country, a literary man of some prominence, and a genealogist of recognized reputation, died here to-day after a long illness. Mr. White attained prominence in National public life when in 1871 to 1878 he was United States Superintendent of Indian Affairs, having charge of seven tribes and six agencies."