Sigma Kappa's colors are lavender and maroon, chosen in 1891. In 1993, Sigma Kappa established a housing corporation.

In 1992, it began another program as part of its gerontology initiatives, 'Inherit the Earth'. In 1962, it established a separate branch, the Sigma Kappa Foundation, to manage its philanthropy funds, and added Alzheimer's disease as a focus for its gerontology philanthropy in 1984. In 1959, the sorority absorbed another NPC social sorority, Pi Kappa Sigma, which had been formed in 1894 at Michigan State Normal College (Now Eastern Michigan University). In 1954, Sigma Kappa adopted gerontology as its third and most extensive philanthropy, which continues to the present day. In 1937, it began sending out field consultants for collegiate chapters. In 1924 Sigma Kappa established its first national headquarters in Reading, Massachusetts, which would move to Indianapolis, Indiana, in 1936. Its mission complete, the Farm School effort has been discontinued. Its second philanthropy, begun in the aftermath of WWII in 1946 had an international focus, supporting the American Farm School of Thessaloniki, Greece. In 1918, the sorority adopted the Maine Sea Coast Missionary Society as its first philanthropy interest. Her parents, Ada Woodruff and Oliver Perkins Anderson, gave a lodge to the chapter on Puget Sound, used up until 1919. In 1912, its Seattle Mu chapter first-year student Dorothy Louise Anderson, whom Lake Dorothy is named after, died of illness. The sorority first published its magazine, the Sigma Kappa Triangle, in 1907. Įxpansion began in 1904 at Boston University, and in 1905, Sigma Kappa joined the National Panhellenic Conference. The vote also meant that the members began expansion outside of Colby College. Early records indicate that the groups met together, but in 1893, the members voted to stop expanding inside the college, meaning that the Alpha chapter could initiate to the limit of 25, but Beta and Gamma chapters could initiate no more and would eventually disappear. In the first constitution, chapters were limited to 25 members, and so Beta chapter and Gamma chapter were also established at Colby College as more joined. Mann Hall was the first to marry (a fellow Colby student).

Much of the original initiation music was written by Hoag's cousin, Emily Peace Meader, who was inducted shortly before Hoag's death in 1875. The first Sigma Kappa emblem was designed by Hoag, who died shortly thereafter of tuberculosis. Low was the first woman to appear on the sorority's rolls and the first to preside over an initiation, of which Coburn wrote a large portion. Sigma Kappa annually celebrates November 9 as its Founders' Day. On November 9, 1874, the faculty approved their petition. They were instructed by the college administration that they would need to present a constitution and bylaws with a petition requesting permission to form Sigma Kappa. As the only women, they associated frequently and decided to form a society. In 1871, Mary Caffrey Low Carver became the first and only female student at Colby College in Maine until Elizabeth Gorham Hoag, Ida Mabel Fuller Pierce, Frances Elliott Mann Hall and Louise Helen Coburn were admitted and enrolled in 1873.

The sorority is one of 26 members of the National Panhellenic Conference (NPC) of national women's fraternities, joining the conference in 1905. It is officially partnered with the Maine Sea Coast Mission to raise money for the Mission's programs, and it also includes gerontology with an emphasis on Alzheimer's disease and research its other initiatives. The sorority has initiated 172,000 members, has 122 collegiate chapters, and has over 110 alumnae chapters. In 1874, Sigma Kappa was founded by five women: Mary Caffrey Low Carver, Elizabeth Gorham Hoag, Ida Mabel Fuller Pierce, Frances Elliott Mann Hall and Louise Helen Coburn. Sigma Kappa ( ΣΚ, also known as SK or Sig Kap) is a sorority founded on Novemat Colby College in Waterville, Maine. North American collegiate sorority Sigma Kappa

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