[22] According to the U.S. Census Bureau, Somerdale had a total area of 1.39 square miles (3.61 km2), all of which was land.

[23][24][25] The 2010 United States census counted 5,151 people, 2,026 households, and 1,345 families in the borough.

[6] The borough form of government used by Somerdale is a "weak mayor / strong council" government in which council members act as the legislative body with the mayor presiding at meetings and voting only in the event of a tie.

The mayor can veto ordinances subject to an override by a two-thirds majority vote of the council.

[33][34][35] As of 2023[update], the mayor of Somerdale is Democrat Gary J. Passanante, whose term of office ends December 31, 2023.

Members of the Borough Council are Council President George Badey (D, 2024), David A. Alexander (D, 2025), George C. Ehrmann (D, 2024), Barbara Kane (D, 2025), James J. Perry (D, 2023) and Lawrence R. "Larry" Sefchick (D, 2023).

[42][43][44] For the 119th United States Congress, New Jersey's 1st congressional district is represented by Donald Norcross (D, Camden).

[47] For the 2024-2025 session, the 6th legislative district of the New Jersey Legislature is represented in the State Senate by James Beach (D, Voorhees Township) and in the General Assembly by Louis Greenwald (D, Voorhees Township) and Pamela Rosen Lampitt (D, Cherry Hill).

At a reorganization meeting held in January after each election, the newly constituted Board of Commissioners selects one member to serve as Director and another as Deputy Director, each serving a one-year term in that role.

[56][49][57][58][59] Camden County's constitutional officers are: Clerk Pamela Rosen Lampitt (D, Cherry Hill, 2029)[60][61] Sheriff Chuck Billingham (D, Gloucester City, 2027)[62][63] and Surrogate Michelle Gentek-Mayer (D, Gloucester Township, 2025).

[68][69] In the 2008 presidential election, Democrat Barack Obama received 68.3% of the vote (1,758 cast), ahead of Republican John McCain, who received around 28.5% (734 votes), with 2,573 ballots cast among the borough's 3,437 registered voters, for a turnout of 74.9%.

[70] In the 2004 presidential election, Democrat John Kerry received 65.2% of the vote (1,653 ballots cast), outpolling Republican George W. Bush, who received around 33.0% (836 votes), with 2,535 ballots cast among the borough's 3,444 registered voters, for a turnout percentage of 73.6.

[83] Our Lady of Grace was a K–8 elementary school that operated under the auspices of the Roman Catholic Diocese of Camden.

[85] U.S. Route 30 traverses the borough, from the border with Magnolia to the north and to Stratford to the south.